Epson LQ-2550 Technical Manual Download Page 176

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REV.-A

4.2.4.6 Cooling Fan Removal

Step 1:

Remove the upper case. (Refer to Section 4.2.2.)

Step 2:

Remove the push tractor unit. (Refer to Section 4.2.3. 1.)

Step 3:

Remove the ROMA board. (Refer to Section 4.2.4.1.)

Step 4:

the

board. (Refer to Section 4.2.4.2.)

Step 5:

Remove the eight screws

X 6) securing the ground plates, then remove the four

ground plates.

Step 6:

Remove the screw

X 8) securing the ground terminal of the power cord.

Step 7:

Remove the three screws

X 12) securing the base plate to the lower case.

12)

(o)

12)

X 6)

Base Plate

Plate

Power Cord

Figure 4-19. Base Plate Removal

Step 8:

Remove the two ground screws

X 6) at the rear of the printer, then remove the

base plate.

Step 9:

Tear off the three pieces of tape fixing the cooling fan wires to the lower case.

Step 10: Remove the two screws

X 12) securing the fan adapter to the lower case.

Step 1 1: Lift the cooling fan together with the fan screen and fan adapter, and remove them.

(0)

Figure 4-20. Ground Screws Removal

Tape

Lead Wire

Cooling

Fan

Fan Screen
Fan Adapter

X 12)

Figure 4-21. Cooling Fan Removal

4-14

Summary of Contents for LQ-2550

Page 1: ...L Q 2 5 5 0 TECHNICAL MANUAL EPSON ...

Page 2: ...IS MANUAL DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS WARNING REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE LISTED ON THE SERIAL NUMBER R...

Page 3: ...apter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Provides a general product overview lists specifications and illustrates the main components of the printer Describes the theory of printer operation Discusses the options Includes a step by step guide for product disassembly assembly and adjustment Provides Epson approved techniques for troubleshooting Describes preventive maintenance tech...

Page 4: ...REV A REVISION TABLE REVISION DATE ISSUED CHANGE DOCUMENT A March 31 1988 I 1st issue I I I I I 1 I I 1 f t DŠˆ v ...

Page 5: ...LE OF CONTENTS CHAPTER 1 GENERAL DESCRIPTION CHAPTER 2 OPERATING PRINCIPLES CHAPTER 3 OPTIONAL EQUIPMENTS CHAPTER 4 DISASSEMBLY ASSEMBLY AND ADJUSTMENT CHAPTER 5 TROUBLESHOOTING CHAPTER 6 MAINTENANCE APPENDIX vi ...

Page 6: ...ER INITIALIZATION 1 22 1 6 1 Hardware Initialization 1 22 1 6 2 Software Initialization 1 22 1 6 3 Default Values 1 22 ERROR CONDITIONS AND BUZZER OPERATION 1 23 1 7 1 Error Conditions 1 23 1 7 2 Buzzer Operations 1 23 MAIN COMPONENTS 1 24 1 8 1 1 8 2 1 8 3 1 8 4 1 8 5 1 8 6 Printer Mechanism 1 25 1 8 1 1 Overview 1 25 1 8 1 2 Paper Handling and Operations 1 26 ROMA Board Main Board 1 27 ROPS ROPS...

Page 7: ...Test Printing LQ 1 20 Figure 1 13 Hexadecimal Dump List 1 21 Figure 1 14 LQ 2550 Component Locations 1 24 Figure 1 15 Model 5560 Printer Mechanism 1 25 Figure 1 16 ROMA Board 1 27 Figure 1 17 ROPS ROPSE Board 1 28 Figure 1 18 Fan Unit 1 29 Figure 1 19 Housing 1 29 Figure 1 20 Control Panel 1 30 Figure 1 21 SelecType Operational Sequence 1 33 Table 1 1 Table 1 2 Table 1 3 Table 14 Table 1 5 Table 1...

Page 8: ...rallel l F Connector Pin Assignments 1 15 Table 1 13 Select Deselect Control 1 16 Table 1 14 Serial Interface Handshaking 1 17 Table 1 15 RS 232C Serial Interface Connector Pin Assignments 1 19 Table 1 16 Self Test Operation 1 20 Table 1 17 Hexadecimal Dump Operation 1 21 l iii ...

Page 9: ...ease function Automatic platen gap adjustment function Micro adjustment function Tear off function Automatic paper loading ejectin9 function Color printing capability Low noise acoustics Both 8 bit parallel and RS 232C serial interfaces Push and optional pull tractor feeding Printing of fanfold paper without removal of the cut sheet feeder option Optional interface for the EPSON 8100 series Option...

Page 10: ...black Table 1 2 Optional Interface Boards No Name 8 1 4 3 New serial interface 8 1 4 5 RS 232C current loop interface type II 8 148 Intelligent serial interface 8 149 Intelligent serial interface type II 8 149M I Intelligent serial interface type Ill 8 161 I IEEE 488 interface 81 65 I Intelligent IEEE 488 interface 8 172 I 32 K byte buffer parallel interface 8 172M 128K byte buffer parallel interf...

Page 11: ...without the Identity Module Specifications not affected by firmware hardware specifications are the same whether or not the Identity Module is installed 1 2 1 Hardware Specifications Printing Method Serial impact dot matrix Pin Configuration See Figure 1 2 1 2x2 staggered diameter 0 2 mm 5 7 1 11 13 15 17 21 23 0 2 OJ 4 I 6 8 10 12 14 4 16 la 20 22 24 1160 Figure 1 2 Printhead Pin Configuration 1 ...

Page 12: ...l panel Mount the pull tractor unit optional Do not loosen the paper between the platen and the pull sprocket Precisely align the horizontal position of the pull sprocket and push tractor Do not perform reverse feeding for more than 1 6 Do not perform reverse feeding after the paper end has been detected Multiple copy paper must be pasted together using line or dots Copy paper must be carbonless m...

Page 13: ...l t v r i n t MAX 1 3 3 6 4 m m I e a r e a 0 52 T ABC T XYZ L ABC J XYZ 3mm 0 1 2 3 mm or more Printing is possible approx 8 5mm 0 33 from the top of the paper But the paper feed accuracy can not be assured in the area approx 22mm 0 87 from the top of the paper Printing is possible approximately 45 9mm past the point where end of page has been detected Thus the value 13 3mm 0 52 lowest print posi...

Page 14: ... 06 0 46 0 0023 0 0 18 Weight IIbs 1 sheet 12 2 2 4 0 8 2 g m2 6 sheets 12 1 5 4 0 58 2 g m2 each sheet Printable area i 0 35 9 mm or more 4 0 35 9 mm or more i Printable area 4 16 101 4C 6mm M d Printable area I o 0 0 0 0 0 0 0 0 0 0 0 0 L o ABC d XYZ o 0 0 0 0 0 o 0 0 0 0 T o ABC T XYZ o 0 0 o 0 0 0 0 0 0 0 0 0 0 101 381 mm 4 15 wide paper 13mm or more 406 mm 16 wide paper 26mm or more Figure 1 ...

Page 15: ... 1 6 4 X 15 1 6 4 X 1 7 1 6 O 19 mm 0 0075 max NOTE Thickness excluding the base paper must be less than or equal to 0 12 mm 0 0047 NOTES 1 2 3 4 Printable Printing of labels is only possible at normal temperature Labels must be fanfold Labels with pressure sensitive paper must be joined by dot or line pasting and the total thickness must be less than or equal to 0 3 mm 0 01 1 8 and should be prin...

Page 16: ...e Table 1 7 Table 1 7 Dimensions and Weight Width mm Height mm Depth mm Weight Kg 676 198 535 20 approx NOTE Including the paper feed knob and paper guide Electrical Specifications See Table 1 8 Table 1 8 Electrical Specifications 1 0 0 120 V Version 220 240 V Version f I Voltage AC 1 0 8 1 3 2 1 9 8 2 6 4 Frequency Range Hz 49 5 6 0 5 Rating Current A 1 6 1 0 Insulation Resistance M ohm min 10 be...

Page 17: ... 1 within 1 ms 2 1 I Safety Approvals Safety standards Radio frequency Interface RFI Resistance to Vibration G 55 Hz max 0 50 0 25 x With shipment container 5 million lines excluding printhead MCBF Mean Cycles Between Failure 6000 POH duty 25 POH Power On Hour 200 million strokes wire UL478 U S A version CSA22 2 154 VDE0806 TUV European version FCC class B U S A version VDE0871 self certification ...

Page 18: ...nt and Character Spacing Roman 10 12 15 Proportional SansSerif 10 12 15 Proportional Courier 10 12 15 Proportional Prestige 10 12 15 Proportional Script 10 12 15 Proportional OCR B 10 12 Proportional OCR A 10 12 Proportional Draft 10 12 15 Printing quality Draft LQ Character pitch 10 12 15 CPI or Propotiional Condensed Double width Double height Emphasized Double strike Italic Underlined Outline S...

Page 19: ... 5 250 167 102 1 7 5 124 83 102 1 x x Ignored proportional o x o 8 6 94 Max 116 20 221 Min 272 1 4 3 50 Max 58 10 111 Min 136 1 x o 17 1 189 Max 233 40 444 Min 544 1 8 6 94 Max 116 20 221 Min 272 proportional o x o 12 8 142 Max 174 Superl 30 subscript 333 Min 408 1 6 4 71 Max 87 15 167 Min 204 1 x o 25 7 285 Max 174 60 667 Min 816 1 12 8 142 Max 87 4 30 333 M i n 2 0 4 NOTES 1 Max means the value ...

Page 20: ... Descender Area Face Wid h al 4 Character Width CW Superscript Character Pin Nos 17 to 24 are not used for superscript printing 3 4 5 6 7 8 9 10 II 12 I 14 r T s P A c E R k H T s P A c E Subscript Character Pin Nos 1 to 8 are not used for subscript printing 9 10 II 12 13 14 15 16 17 18 21 22 23 2 4 L E F T s P A c E R A H T s P A c E f 1 L r Figure 1 6 Character Matrix 1 12 ...

Page 21: ...ensed 360 360 LQ proportional Max 39 x 23 360 2 6 X 3 2 180 Min 18 x 23 360 1 0 X 3 2 LQ proportional condensed 360 360 360 LQ proportional super subscript Max 28 x 16 360 1 8 X 2 3 180 Min 12 x 16 360 0 7 X 2 3 LQ proportional super subscript 360 condensed 360 360 NOTES 1 HDD means the Horizontal dot density and the units are dots per inch 2 Face matrix and character size indicate the maximum siz...

Page 22: ...ROBE NOTE Transmission time Figure 1 7 8 bit parallel By STROBE pulse By BUSY and ACKNLG either or both ITL LS compatible See Figure 1 7 57 30360 AMPHENOL or equivalent See Figure 1 8 Refer to Table 1 12 Refer to Table 1 13 rising and falling time of every input signal must be less than 0 2 s Data Transmission Timing for the 8 bit Parallel Interface 1 19 GNO Pa ml 2 20 GNO Pm w tn2 3 21 GNO IPa c ...

Page 23: ...lized a line feed is automatically performed by input of CR code Auto LF 15 NC Not used 16 GND Ground for twisted pair 17 Chassis GND Printer chassis ground 18 NC Not used to 30 GND Ground for twisted pair 31 INIT 16 I Pulse width 50 WS min active LOW input for printer initialization 32 ERROR o LOW indicates that some error has occurred in the printer 33 GND Ground for twisted pair 34 NC Not used ...

Page 24: ...s exists other than that attributable to the OFF LINE mode Once the printer is deselected by the DC3 code the printer will not revert to the selected state until the DC 1 code is input In the deselected state input data is ignored until DC 1 is received The DC 1 and DC3 codes are enabled only when the SLCT IN signal Input Connector Pin No 36 when the parallel interface unit is used is HIGH and the...

Page 25: ...e printer is not ready to receive data SPACE X ON DC 1 1 1 H When the number of bytes remaining in the input buffer reaches 528 or more the signal level goes to SPACE or an X ON code is sent to the host computer This indicates that the printer is ready to receive data DTR REV Signal I MARK 12V L I I I I I I I I t 1 I I I I I SPASE 12V I 1 I 8Kbyte 512 byte 256byte O byte Input Buffer Vacant Area W...

Page 26: ...ructure of serial data is 1 start bit 8 data bits parity Odd Even or none 1 or more stop bits Figure 1 10 Serial Data Transmission Timing Error Detection Connector Connector Pin Assignments Parity error is printed Overrun error Ignored Framing error Ignored D SUB 25 pin connector See Figure 1 1 1 Refer to Table 1 15 1 CHA5 51S GND Z TXO 3 RxD 4 NC 5 NC SAC 7 SIGW GNO e Nc 9 NC to Nc t I REv IZ NC ...

Page 27: ...m the printer Pin No Signal 1 0 Description 2 TXD o Transmit data 2 0 DTR o Indicates when printer is ready to receive data MARK level indicates printer is not ready to receive data 11 REV 2nd RTS o Same as DTR 3 RXD I Receive data 7 SIGNAL GND Signal Logic ground level 1 CHASSIS GND Printer chassis ground 1 19 ...

Page 28: ...hile pressing the Push the ON LINE switch and turn the LINE FEED switch power OFF LQ Turn the power ON while pressing the FORM FEED switch C u r r e n t s e t t i n g FONT Roman PITCH 10CPI CONDENSED o f f FORM LNG Tractor 66LINE CSF binl 132LINE CSF bin2 132LINE 1 SKIP off AUTO TEAR OFF o f f LEFT MARGIN o RIGHT MARGIN 136 CG TABLE Italic COUNTRY USA PRINT DIR Bi d COLOR Black Default setting A I...

Page 29: ...m p M o d e 31 2E 31 20 46 45 41 54 55 52 45 53 OD 06 OD OA 54 68 65 20 4C 51 2D 38 35 30 2F 31 30 35 30 20 70 72 69 6E 74 65 72 73 20 61 72 65 20 6D 75 6C 74 69 66 75 6E 63 74 69 6F 6E 61 6C 2C 20 32 34 2D 70 69 6E 20 70 72 69 6E 74 68 65 61 64 2C 20 69 6D 70 61 63 74 20 64 6F 74 2D OD 06 6D 61 74 72 69 78 20 70 72 69 6E 74 65 72 73 2E 20 54 68 65 20 6D 61 69 6E 20 66 65 61 74 75 72 65 73 20 6F 6...

Page 30: ... When the printer is initialized in this way it performs the following actions Clears the image buffer Sets printer selections to their default values Several settings are changed by the last SelecType operation before ESC is input Refer to Section 1 6 3 1 6 3 Default Values The default values set by the default setting mode of the SelecType function are only reset by a hardware initialization The...

Page 31: ...to enter OFF LINE mode Paper out is detected A paper out signal is detected after the printer has perFormed a paper loading operation with the cut sheet feeder enabled For information concerning the status of the interface signals refer to Table I l 2 1 7 2 Buzzer Operation The buzzer rings as follows When a BEL code is sent to the printer the buzzer sounds for 0 1 seconds When an error has occurr...

Page 32: ... c Model 5560 printer mechanism ROMA board main board ROPS ROPSE board power supply board 100 120V and 220 240V versions Fan Unit Housing ROPNL W board Figure 1 14 shows control panel the LQ 2550 component locations Printer Fan Unit Figure 1 14 LQ 2550 Component Locations Mechanism r 1 24 ...

Page 33: ...dling the following functions are newly incorporated in this 24 pin printer in addition to the conventional ones Automatic release mechanism Automatic paper thickness detection nechanism Automatic platen gap adjustment mechanism Automatic paper width detection mechanism Automatic loading lever open close mechanism Figure 1 15 Model 5560 Printer Mechanism 1 25 ...

Page 34: ... TOF ADJUST is displayed on the LCD and the MICRO FEED V and A LEDs are lit Pressing the FORM FEED switch advances the paper forward in increments ofl 1 80 continuously as long as the switch is held down and pressing the LINE FEED switch moves the paper in reverse in increments of 1 180 Moving the paper with these switches is called micro adjustment The adjusted position is stored in the memory an...

Page 35: ...l IC M546 10P 1 1 B S17304 7C STK6981 H 7D H8D2148 2C STK66082E 1A 8 bit one chip CPU main control 8 bit one chip CPU sub control Memory management unit MMU IC Printhead data control IC Carriage CR and paper feed PF motors phase pulse control unit MCU IC Platen gap PG and color select CS motors phase pulse control unit MCU IC Main CPU program 256 K bit Sub CPU program 256 K bit Character generator...

Page 36: ...S for 100 120 V AC operation or the ROPSE for 220 240 V operation The basic construction of the two boards are the same each board contains a fuse line filter and switching regulator circuit Compact circuitry is made possible by the use of a DC to DC converter L ROPS Board f ROPSE Board Figure 1 17 ROPS ROPSE Board 1 28 ...

Page 37: ...c circuits Figure 1 18 Fan Unit 1 8 5 Housing The housing consists of the upper and lower cases and accommodates the control panel printer mechanism control circuit board power circuit and fan unit The optional cartridges e g font and identity modules can be mounted easily without removing the upper case Figure 1 19 shows the LQ 2250 housings Figure 1 19 Housing 1 29 ...

Page 38: ...mperature is too high FORM FEED Switch Pressing this switch top of form position adjustment function LINE FEED Switch once while the printer is OFF LINE advances the paper ve ically to the next This switch is also used for and the SelecType function the micro adjustment function the platen gap When the printer is OFF LINE the paper advances continuously one line at a time if this switch is pressed...

Page 39: ...cels the micro adjustment function When this function is enabled the LED on this switch and the V and A LEDs are lit In the micro feed mode the LINE FEED switch is used to feed the paper backward and the FORM FEED switch is used to feed the paper forward Paper feed performed in this micro feed mode does not affect the page position control This function is also used to adjust the paper loading pos...

Page 40: ...DEFAULTS means that MACRO settings or DEFAULT settings will not be stored in the backup memory Refer to Figure 1 21 for the entire SelecType operational sequence The SelecType mode has five menus While the message SeiecType MODE is displayed every time the LINE FEED V switch is pressed the main menu of this mode is displayed in the order LOAD MACRO Function in which the settings stored in one of t...

Page 41: ...cuit 2 31 2 2 5 1 5 V Current Limiting and Voltage Regulator Circuits 2 32 2 2 6 Main Switching Circuit 2 35 V Supply Circuit 2 34 2 2 7 35 V Current Limiting and Voltage Regulator Circuits 2 36 2 2 8 Over Voltage Protection Circuit 2 39 2 3 CONTROL CIRCUIT BOARD ROMA Board 2 40 2 3 1 Reset Circuit 2 42 2 3 1 1 VX Drive System Pull up Voltage Supply Circuit 2 43 2 3 1 2 Power ON OFF 2 44 2 3 1 3 I...

Page 42: ...A Gate Array 2A 2 75 2 3 5 2 Printhead Drive Circuit 2 76 2 3 5 3 Relationship Between Paper Thickness and Print Mode 2 78 2 3 5 4 Relationship Between the First Printhead Drive Pulse Width and 35 V Line Voltage 2 79 2 3 6 HF Motor Control Drive Circuit 2 80 2 3 7 CR and PF Motors Control Drive Circuit 2 82 2 3 7 1 E05A09BA Gate Array MCU 4B 2 83 2 3 7 2 CR Motor Control Drive Circuit 2 84 2 3 7 3...

Page 43: ...Mechanism 2 13 Color Ribbon Strip Selection 2 15 Color Select Mechanism 2 15 Push Tractor Feeding 2 17 Friction Feeding 2 18 Paper Release Mechanism Operations 2 21 Paper Loading Lever Open Close Mechanism Operation 2 24 ROPS ROPSE Board Block Diagram 2 26 Input Filter Circuit 2 27 Rectifier Smoothing and Surge suppression Circuits 2 27 Surge Current 2 28 Main Switching Circuit 1 2 28 Main Switchi...

Page 44: ...rial Interface Circuit 2 53 RS 232C Serial Interface Circuit Operation 2 54 RS 232C Data Transmission Timing 2 54 Control Panel Interface Circuit 2 55 MSM59371 Data Transfer Timing 2 56 MSM59371 Block Diagram 2 56 SED1 200 Block Diagram 2 58 SED1 200 Command Data Write Timing 2 59 SED1 200 Character Code Map 2 60 Reference Voltage Supply Circuit 2 63 35 V Line Voltage Detection Circuit 2 64 35 V L...

Page 45: ...otors Drive Circuit Block Diagram 2 98 Figure 2 90 PG Motor Drive Circuit 2 100 Figure 2 91 PG Motor Drive Circuit Signal Timing 2 100 Figure 2 92 PG Motor Phase Switching Timing 2 101 Figure 2 93 Paper Thickness and Platen Gap 2 101 Figure 2 94 CS Motor Drive Circuit 2 102 Figure 2 95 CS Motor Phase Switching Timing 2 103 Figure 2 96 PT RL LD Solenoid Drive Circuit 2 104 Figure 2 97 PT Sorenoid D...

Page 46: ...Paper Feed Mechanism Specifications 2 16 PF Motor Specifications 2 16 PE Sensor Specifications 2 16 Paper Feeding Method and Paper 2 16 Paper Release Mechanism Specifications 2 19 RL Solenoid Specifications 2 19 RL Sensor Specifications 2 19 Paper Feeding Method Switch Timing 2 20 Paper Loading Lever Open Close Mechanism Specifications 2 22 LD Solenoid Specifications 2 22 LD Sensor Specifications ...

Page 47: ...d AN1 Voltage 2 73 E05A02LA Gate Array Functions 2 75 Printhaad Drive Pulse and Paper Thickness 2 78 Printhead Coil Drive Cycle Printhead First Drive Pulse Width and Print Mode 2 78 H8D2148 Input Signal and HF Motor Status 2 81 MCU 4B Address Allocations 2 83 MCU POT Terminal States and Carriage Speed 2 85 CR Motor Speed and Phase Switching System 2 90 Various PF Motor Control Relationships 2 93 M...

Page 48: ...mechanism ROPS ROPSE power circuit board ROMA control circuit board and control panel In this chapter the following abbreviations are used CR Carriage CS Color select PE Paper end PF Paper feed PG Platen gap PT Paper thickness LD Loading RL Release HP Home position HF Head fan PW Paper width 2 1 ...

Page 49: ...ions of the connectors FANuNITk CARRIAGE HOME POSITION SENSOR PAPER THICKNESS SOLENOID SENSOR PAPER END SENSOR PAPER WIDTH SENSOR COLOR SELECT MOTOR HEAD FAN MOTOR PRINTHEAD z THERMISTOR 23 PLATEN GAP z MOTOR PLATEN GAP tllHOME IWSITION SENSOF LOADING T SOLENOID SENSOR CARRIAGE MOTOR PAPERWED MOlm r 8C0 L Figure 2 1 Cable Connections 2 2 ...

Page 50: ... CN9 I Printer mechanism CS motor HF motor and 18 PW sensor l i CN 10 Printhead R I 18 I CN1l I Printhead F I 18 I CN 12 I PT solenoid and PT sensor 5 CR HP sensor 3 I CN 13 I I CN14 I Fan unit I 2 PE sensor 2 PG motor and PG HP sensor 9 CR motor 6 PF motor 6 LD solenoid and LD sensor 4 RL solenoid and RL sensor 4 Case open sensor 3 5 VDC 12 VDC 35 DC 12 Power supply board 2 I CN 15 I I CN16 II CN...

Page 51: ...r I I 35 HF Motor Thermal Sensor f t Driver Circuit I 35 PG Adjust Mechanism I A I PT Solenoid I PT Sensor I I 35 PA Motor PG H P Sensor Driver Circuit 35 Carriage Mechanism A CR Motor T Driver Circuit CR H P Sensor I PW Sensor I I 35 I AS Motor Driver Circuit I 3 5 5 Paper Feed Mechanism 44 I I PF Motor c I I Driver Circuit I PE Sensor I 35 AL Solenoid 4 I Driver Circuit RL Sensor I I 35 LD Solen...

Page 52: ...hrough the assigned head driving coil in the printhead This magnetizes the coil and the iron core This magnetism pulls the actuating plate to the iron core and the dot wire attached to the plate is pushed toward the platen The dot wire strikes the inked ribbon and paper against the platen to print a dot on the paper When the coil is de energized the iron core loses it magnetic force so that the ac...

Page 53: ... 2 mm Pin Configuration 12 line X 2 col Dot Pitch 1 1 80 Drive Voltage 35 VDC 10 Coil Resistance 8 6 ohms 10 25 C for one coil Drive Frequency 2 00 KHz Max Drive Mode Normal The selection is depend on the paper copy 1 thickness Refer to section 2 3 5 3 copy 2 for details Thermal Sensor Thermistor Built in f 2 6 ...

Page 54: ...ction and if the printhead temperature rises to about 40 C the HF motor Refer to Table 2 3 for its specif ications is turned on to cool down the printhead Another thermistor is used to protect the HF motor drive circuit from abnormal heating of the HF motor Printhead Thermistor Thermistor Figure 2 4 Printhead Cooling Mechanism Table 2 3 HF Motor Specifications Item I Description I Remarks Type Two...

Page 55: ...r lever is driven by the PT solenoid when it is energized The distance that the PT sensor lever moves is monitored by the TCR on the PT sensor and the detected value is converted into a voltage and transferred to the control circuit Table 2 4 lists the specifications of the PT solenoid and Table 2 5 lists the specifications of the PT sensor Platen O w u Y PT Sensor Lever L pTso enoid I q O T I 1 u...

Page 56: ... is loaded point A of the paper sensor lever holds the paper against the platen Tb is used for this TCR reading Platen PT Sensor Lever A B TCR a When no paper is loaded b When paper is loaded Figure 2 7 Paper Thickness Detection Operation Tb The control circuit uses Tb Ta as the paper thickness and controls the platen gap mechanism so as to provide the proper platen gap for the paper The control c...

Page 57: ... Guide Shaft B a PG Motor Gear Train u Gap Printhead Platen Guide Shaft B e C w C c w b Platen Gap Adjustment Figure 2 8 Platen Gap Adjustment Mechanism Table 2 6 Platen Gap Adjustment Mechanism Specifications L Motor I Driving method I Sensor I I PG motor Gear transmission PG HP sensor c Refer to Table 2 7 Refer to Table 2 8 Table 2 7 PG Motor Specifications Item Description I R e m a r k s Type ...

Page 58: ...he carriage is fixed to the timing belt on one side and is moved when the CR motor drives the timing belt Printing is accomplished by the combination of printing mechanism and carriage movement mechanism operations The print start position is determined by the CR HP sensor when the mechanism is initialized The PW sensor monitors paper width so as to prevent printing outside the printable area See ...

Page 59: ...Four phase 200 pole PM type step per motor Drive Voltage 35 VDC 10 YO Coil Resistance 2 15 ohms 10 25 C for one coil Driving Frequency 4000 PPS 2 2 phase excitation 2667 PPS 2000 PPS 1 2 phase excitation 1333 PPS 667 PPS Driving Method Constant current chopper drive Table 2 11 CR HP Sensor Specifications Item Description Remarks Type Photo interrupter Drive Voltage 5 VDC 5 yo G 3 Table 2 12 PW Sen...

Page 60: ... gear Refer to Table 2 1 3 Table 2 13 Ribbon Feed Gear Train Direction of Carriage Movement Gear Train Left to right arrow C Right to left arrow Ribbon drive pulley Ribbon feed planetary gear Ribbon feed transmission gear A Ribbon feed transmission gear B 1 Ribbon drive gear Ribbon drive pulley Ribbon feed planetary gear Ribbon feed transmission gear B2 Ribbon drive gear The inked ribbon is a loop...

Page 61: ...en colors are printed by mixing the three ribbon colors Table 2 15 CS Motor Specifications item I Description Type Four phase 48 pole PM type stepper motor Drive Voltage 35 VDC Hold Voltage 5 VDC Coil Resistance 165 ohms 5 10 ohms Driving Frequency 450 PPS Driving Method Constant voltage drive Table 2 16 Color Select Remarks 1 O xo 570 25 C for one coil 2 2 phase excitation Print Ribbon Print colo...

Page 62: ...is selected by the CS motor rotating 40 steps from Color select home position point C Refer to Figure 2 13 b When the black ribbon cartridge is mounted the bottom of the ribbon cartridge touches projecting part A of the carriage This keeps the bottom of the black ribbon cartridge away from the CS rod during movement and defeats the color select mechanism operation The cartridge location spring at ...

Page 63: ...ifications Item Description Remarks Type Four phase 48 pole PM type stepper motor Drive Voltage 35 VDC Hold Voltage 5 VDC Coil Resistance I 4 2 ohms A 10 I 25 C for one coil Driving Frequency 144 PPS 2 2 phase excitation Driving Method Constant voltage drive Table 2 19 PE Sensor Specifications c Item I Description I Remarks I I I Type I c Mechanical switch Rated Voltage I 5 VDC 1 5 I Push tractor ...

Page 64: ... load fan fold paper into the push tractor unit Paper Releae Lever P r close ar Gear i Side View ii Top View a Gear Arrangement Push Tractor Paper Tension Roller Continuous Paper 0 Paper Holding Roller l B o c w J c C c w u o P n or G Platen PF Roller release b Paper Path Figure 2 14 Push Tractor Feeding 2 17 ...

Page 65: ...per feed roller During friction feeding the paper release lever retracts the tractor gear from the tractor transmission gear so that the push tractor is not driven Paper Release Lever Paper Te Pape Tra sor P i Side View ii Top View a Gear Arrangement Cut Sheet Paper Paper Tension Roller 1 1 DA Paper Holding Roller J 1 t 4 Q 0 C w PE Sensor C c w Of Platen PF Roller friction open b Paper Path Figur...

Page 66: ... mechanism Table 2 21 Paper Release Mechanism Specifications Motor Driving Method Trigger Sensor PF motor Gear via trigger RL solenoid RL sensor Refer to Table 2 18 clutch Refer to Table 2 22 Refer to Table 2 23 Table 2 22 RL Solenoid Specifications Item Description Remarks Coil Resistance 130 ohms 10 Drive Voltage 35 VDC 10 Table 2 23 RL Sensor Specifications Item Description Remarks Type Micro s...

Page 67: ...is energized the RLtrigger is pulled and the clockwise rotation of the PF motor is transmitted as follows PF motor PF transmission gear Tractor transmission gear Sun gear RL planetav gear A Paper release lever The RL sensor confirms the switching operation Subsequently the PF motor is driven counterclock wise so as to allign the RL planetary lever and RL trigger Switching from Friction Feeding to ...

Page 68: ...r Release Lever RL Sensor close 1 J RL planetary Gear B a Tractor with tractor A transmission sl gear b Tractor Friction d Friction Tractor C w C c w c Friction Figure 2 16 Paper Release Mechanism Operations 2 21 ...

Page 69: ...ethod Trigger Sensor PF motor Gear via LD solenoid LD sensor Refer to Table 2 18 trigger clutch Refer to Table 2 26 Refer to Table 2 27 Table 2 26 LD Solenoid Specifications Table 2 27 LD Sensor Specifications Item Description Remarks Item Description Remarks Coil Resistance 130 ohms 10 Type Micro switch Drive Voltage 35 VDC 10 Rated Voltage 5 VDC 5 Figure 2 17 shows the basic operation of the pap...

Page 70: ...is transmitted as follows PF motor PF transmission gear Platen gear LD planetary gear LD gear A Paper loading lever Paper holding lever Paper holding roller The LD sensor confirms the switching operation Subsequently the PF motor is driven clockwise counterclockwise so as to take up slack in the paper Switching from Open to Close When the LD solenoid is energized the LD trigger is pulled and the c...

Page 71: ...ing Lever LD Sen open Shaft LD a Close I I u b Close Open LD Sensor close Ilml o i ear ii Spring Top View Side View d Open Close a C w w C c w c Open Figure 2 17 Paper Loading Lever Open Close Mechanism Operation 2 24 ...

Page 72: ...be the ROPS board Refer to Appendix Figures A 49 and A 50 for the entire circuit of the ROPS ROPSE board Table 2 30 Voltages and Applications ower SU P PIY Voltage DC Applications 35 V GH Printhead solenoids driving PT solenoid driving LD solenoid driving RL solenoid driving HF motor driving PG motor driving CR motor driving CS motor driving PF motor driving Fan motor driving 5V GL Logic circuit S...

Page 73: ... and stabilized When the power supply for the control circuits starts operating normally voltage is induced in the secondary side of transformer T2 Upon receiving this voltage main switching circuit 2 turns on and voltage is induced in the secondary side of transformer T3 After being rectified and smoothed the 35 V output is fed back to main switching circuit 2 by the current limiting voltage regu...

Page 74: ...cuits Figure 2 20 shows the rectifier smoothing and surge suppression circuits The filtered AC input voltage from the input filter is input to diode bridge DB 1 full wave rectified and smoothed by capacitor Cl 2 Normally the voltage across C 12 is O V before the printer power is turned on This means the line is shorted at C 12 via DB 1 when viewed from the input side Therefore when the power is fi...

Page 75: ...0 V In this circuit the surge current is limited to approx 17 A or less 170 R9 17 A When C 12 is fully charged R9 is shorted to prevent it from wasting energy as heat It is shorted by TRIAC TY 1 When FET Q3 is turned on voltage is induced by coil T314 13 at the primary side in coil T314 13 at the secondaw side of transformer T3 and the line between T1 and T2 is shorted upon receiving IG 2 2 4 Main...

Page 76: ...cross coil T110 E drops At the same time a reverse voltage is applied to coil T1 7 6 the value of IB lowers and current flows in the reverse direction via R 1 and D 1 Since the potential at point becomes higher than that at point speed up capacitor C 11 absorbs current which flows from point to Therefore Q 1 turns off quickly When Q 1 turns off the energy induced in coils T1 3 5 T1 3 4 and T1 z a ...

Page 77: ...IN o J _ 1 1 1 1 0 0 0 T T1 7 6 VIN X t A T 110 8 8 I I I Ion n 5 1 2 12 o Output current 10 1 I I 1 I 1 1 I I i I 1 l l Y i L I AV T 1 OFF 4 ON 1 1 1 I o 10 105 10 12 10 12 Figure 2 23 Main Switching Circuit 1 Waveforms As shown in the figure above the output voltage to the circuits at the secondary side is controlled by the ON OFF time of Q 1 2 30 ...

Page 78: ...hes the energy released from the secondary side of pulse transformer T 1 The 12 V is output after being rectified by D8 and D9 and smoothed by C22 and C23 Fuse resistors R 19 and R22 protect this circuit against a shorted output R 17 and R 18 are dummy resistors and are used to limit the rise of the output voltage when it is open circuited The 5 V is output after being rectified by D7 smoothed by ...

Page 79: ...ing the 5 V output by R24 and R23 is supplied to the plus side pin 3 of IC 1 Voltage VR20 which is proportional to the current flowing through current detection resistor R20 is supplied to the minus side pin 2 of IC 1 As the load at R20 increases VR20 rises When Vrefs VR20 the output pin 1 of IC 1 is changed from 12 V HIGH to O V LOW by Zener diode ZD 1 and R 14 ZD 1 keeps the voltage at the catho...

Page 80: ...w w R12 Vvv Pc 1 Figure 2 26 5 V Voltage Regulator Circuit Q4 keeps the cathode at 5 V using the 2 5 V reference voltage from the gate terminal which is set by voltage dividing resistors R 13 and R 15 If the output exceeds 5 V current IK flows to the cathode of Q4 the photo diode and photo transistor of PC 1 turns on Q2 turns on and Q 1 turns off 2 33 ...

Page 81: ...10 R6 C14 V31N I C15 IL2 12 1k 4 D Q3 R1 1 T2 I Refer to Figure 2 30 Figure 2 27 Main Switching Circuit 2 g One end of coil T2s z is connected to the 5 V line and the other end is connected to the collectors pin 8 and pin 1 1 of the output transistors TR1 and TR2 of IC2 Refer to Figure 2 30 Since IC2 already started switching when it received the 12 V transistors TR 1 and TR2 are on Therefore curr...

Page 82: ...oothed by C31 C32 and C33 and output When the current drops below the limit of the current limiting or voltage regulator circuits after Q3 has turned off TR1 and TR2 turn on again and this sequence is repeated Figure 2 29 shows the waveforms at various points in main switching circuit 2 In this way the voltage output from this circuit is kept constant by controlling the ON OFF time of Q3 which is ...

Page 83: ...outputs from both amlifiers xl Refer to Section A 1 2 1 in Appendix for details Refence voltage for comparison detection Voltage detection section section 1 0 3 5 r f T I I I Current I 11 3Kfl VJ l R371 detection I section I I 1 R ti I I R41 I I 1690 R361 1 1 I R42 I I A C30 o 2y I 1000PF i 50V 35 35V I I I c GH R35 tG 1 Kfl R1 1 T2 3 5 8 r 5V 3 12 Figure 2 30 35 V Current Limiting 12 A R29 200Kf2...

Page 84: ...by dividing the 35 V by R36 and R37 is supplied to the minus side of EA2 via resistor R35 Voltage VRO which is proportional to current 1035 flowing to current detection resistor RO R40 R4 l R42 is supplied to the plus side of EA2 Vrefssl VRO at this time 1035 z 7 A As the load at 1035 increases When the condition shown above is met the output of EA2 changes from LOW to HIGH When the output of EA2 ...

Page 85: ... of EA1 is changed from LOW to HIGH VREF s V35E at this time V035 z 35 3 V When the output of EA 1 is HIGH TR 1 and TR2 turn off and Q3 in main switching circuit 2 turns off In this way the voltage induced in the secondary side of T3 drops When VREF z V35E TR 1 and TR2 starts switching operation again and turns Q3 on and off 2 38 ...

Page 86: ...1 When the output voltage of the 35 V line meets the condition shown in the expression below the output pin 7 of IC 1 changes from HIGH 1 2 V to LOW O V transistor Q5 turns on and R28 is shorted Therefore 5 V is applied to the dead time control terminal pin 4 of IC2 the dead time becomes 100 and TR 1 and TR2 turn off VREF s VOVER V035 z 4 0 8 Then Q3 in main switching circuit 2 is cut off the volt...

Page 87: ... MHZ 1 2 2 MHZ 1 I I I y 2 _ iS T 1 OA M _ IOENTITY FONT I MOOULE I IS LOT Al CSBDO r 71 a 2M BIT ROM C G 1 2A CSBOO 2 IM BIT ROM C G 11 29 CSS40 1 1 1 1 11 1 1 1 ll h VXGEMERATION flol ol 1 Sf AL I IREsETclRc j f p6 3A p o R T lp pEN R i P 7 POO 7 1 E AO A18 MMU 1 4A MM102 I LATCH 14C 8 BIT MM1OO PARALLEL M5461OP 11 B J LATCH l F BA MM101 0 A7 EOSA021A 2A I u PRINTER PRINTHEAO sTK66082E MECHANISM...

Page 88: ... monitoring Buzzer driving The sub CPU has a multiplexed low order address data bus The low order address bus and data bus are selected according to the ALE signal from the sub CPU via a latch 14C Figure 2 35 shows the IC address map for the sub CPU FFFFH FDAOH FD40H FD20H FDOOH 8000H 6000H OOOOH MMU G A 14 LS375 14C E05A02LA k G A 2A M54610P 11 B PS RAM 9A I 1 BANK AREA PROGRAM ROM 1 1A PS RAM 9A...

Page 89: ...evices Reset operation hardware reset is performed when 1 The printer power is turned on or off 2 A low signal is input from the host computer 3 A identity font module is installed or removed with the power on MMU 1 4A m MAIN CPU 13A RESET 1 On ROMA BOARD of LS 175 14C RESET of MCU 4B BI RESET of MCU 3B EXTERNAL RESET of SUB CPU 7B TO RESET of CN2 EXTERNAL Figure 2 36 Reset Circuit 2 42 ...

Page 90: ...rive IC 66 2A R b ZD 1 R2 E PT SOLENOID DRIVE CIRCUIT 4 Iv RESET of E05A02LA R20 Q2 OUTPUT of IC 6B C32 R21 R21 Figure 2 37 Vx Voltage Supply Circuit After the printer power is turned on the 5V line reaches about 4 7V and a potential of about 0 6V VR21 is induced across resistor R21 The difference and 5V is applied to the Vx line When the 5V line drops to about 4 7V or less Q2 and Q 1 turn off so ...

Page 91: ...UT signal high Figure 2 38 TR1 The reset ROUT signal is sent to the IC S on the ROMA board and to the outside via CN2 When the power is switched off the voltage at C66 decreases according to VTHLD Vx e n l and when VTHLD reaches VN the output switches from high to low and the reset circuit the ROUT signal low Dl 4 is a diode used to discharge C66 Vx THLD ROUT AT POWER ON AT POWER OFF v I I 5 VP v ...

Page 92: ... B and IC 6 B When the voltage at the CPU terminal reaches VN the reset circuit in the MMU is activated to set the DISC signal low When the DISC signal goes low the ROUT signal subsequently goes low the voltage at the THLD terminal drops to VN the pulse width shold be TR2 INIT low and then the DISC signal goes high after the reset circuit is initialized When the THLD terminal voltage increases to ...

Page 93: ...value and the DISC signal is set low by the rising edge of the second pulse of the synchronized RDCLK signal Consequently the THLD voltage begins decreasing When the THLD voltage drops to VN the DISC signal goes high an then begins increasing When it rises to VP the ROUT signal goes high and the main and sub CPUS restart from address OOOOH Also Table 2 31 shows the relationship between the input a...

Page 94: ...nditions 5V is applied to Vcc of the ST RAM and the CPU starts read write operations When the power is turned off and the voltage on the 5V line drops to about 3 3V or less transistors Q 19 and Q20 turn off and the voltage from the external lithium battery is applied to the Vcc terminal of the ST RAM In this way the data in the ST RAM is maintained When the voltage from the lithium battery drops t...

Page 95: ... computer does not transfer data until the BUSY signal changes from high to low Some host computers check both the BUSY and ACKNLG signals and others just check either the BUSY or ACKNLG signal After the host computer has confirmed that the BUSY signal is low it places data 8 bits per word in parallel on the data bus DO D7 and the printer reads the data atthefalling edge of the STROBE pulse After ...

Page 96: ...computer read into the sub CPU as default values and transferred to the main CPU Refer to Appendix A 1 l 10 for the details of the M546 10P EXTERNAL M54610P 1 1 El t 6B INIT 6USY ACKNLG DATA1 8 STROBE ERROR PE SLCTIN AUTOFEEO XT1 J Ei5 B03 R87 A4h I RDY CONTROL READY LED pANEL BSYF EBUSY BUSY 9 BSSL T R R A ACKI s h 1 i iF2 I I 1 I I I I iii I I m I I I MAIN CPU I I Wl I I I I l l II JAI m DIN l l...

Page 97: ...reset is occured 1 Set default values PORTO H f i x e d PORT 1 H f i x e d Set initial vaiues EBUSY L B14 L Bll H I YES ERROR STATE I I NO ACKI goes L Wait 5 us I CPU write address at MMIOO t Wait 5 us I ACKI goes H I 5 A Figure 2 44 8 Bit Parallel Interface Circuit Operation if 2 50 ...

Page 98: ...el Interface Timing Table 2 33 8 Bit Parallel l F Signals IEADY ERROR PE BUSY PRINTER HOST Acknowledge H Disable Goes high when ON LINE READY STROBE pulse is sent from host L L H OFF LINE NOT READY An error has occurred for error conditions refer to Section 1 7 1 H OFF LINE PAPER END Paper end has occurred 2 51 ...

Page 99: ...parity Odd Even or none 1 or more stop bits Figure 2 46 DTR 2 X ON X OFF protocol Sent over the TXD line Handshaking Handshaking is accomplished by sending either X ON 1 1H orX OFF 13H over the TXD line to the host When the printer can accept data the printer sends an X ON code When the printer becomes busy it sends an X OFF code to the host computer The X OFF code is sent to the host when the emp...

Page 100: ...n CPU is sent to the 75188 4A converted from TTL to EIA voltage levels and transmitted to the host computer The sequence for the serial interface operation is shown in Figure 2 49 and that for handshaking in Figure 2 50 12 1 2 D1 D2 MMI02 of MMU l 4A 75188 4A CN3 1 VCC GND VCC CLK 4 91 36 6 0 D 4 3 DTR 20 6 5 BUSY EBUSY REV MAIN CPU L J 1 3A IRXA1 1 TxD 2 3 2 TxA 1 I 1 1 1 2 I 1 1 1 I R22 I 1 1 1 ...

Page 101: ...om Host I Host recoin I ze and stoD the data send I I I i ne data butrer v a c a n t a r e a reach Figure 2 49 RS 232C Serial Interface Circuit Operation INITIAL IZE OPERATION H E BUSY L f I SPACE 3 m DTR MARK X ON X OFF X ON SPACE TXD MARK OATA SPACE RXD MARK L INPUT BUFFER t I VACANT ARE 8K byte S 256 byte 512 byte Figure 2 50 RS 232C Data Transmission Timing 2 54 ...

Page 102: ... the ROPNL board PB4 D3 D2 D1 DO AO WE PB5 PB 1 PBO AN5 AN6 AN7 PC3 CN8 LCD SELL I 20 columns G G I 1 2A 2Y 3A 3Y 4A 4Y DIQ 5A 5Y DOO CONTROLLER AOQ 1A IY 6A WRQ 6Y 5 LCDCE t GND VCC 5 LS365 5 P O W E R J 777 1 4 LCD 9B 5 LED 144KUP GND 5 s c1 H 1 1 h LOAD DTO Q J e I I R75 INVERTER AN5 R83 AN6 SWITCH STATUS R85 AN7 READING CIRCUIT c I T RESET CIRCUIT 5 P O R T EXPANDER b PANEL DRIVER LED xl 4 Ic ...

Page 103: ...re used to drive the LEDs and 015 and 016 are for the signals that control the reading of the switch states DATA IN 016 015 014 013 012 011 010 09 1 LED7 LED19 LEO 11 LEO lO LE09 LE016 LE 15 LE l 4 LEW13 L 6 L8 5 L 4 L 3 L 8 q CLK 0 LOAD D Indicates an old value Indicatea a new value I x Switch read control flag NOTES 1 An LED turns on when the data bit is 1 2 Refer to Table A 41 for the layout of...

Page 104: ... must be read using only the three input ports AN5 to AN7 a matrix circuit is constructed using four control signals O 15 and 016 of the MSM59371 CKO and DTO See Table 2 34 The state of the ON LINE switch is monitored using port PC3 of the sub CPU via LPF consisting of R66 and C40 Table 2 34 Switch Status Reading M S M 5 9 3 7 1 SUB CPU OUT IN Control Signal Status Switches Read 0 1 6 0 1 5 CKO DT...

Page 105: ...ore I 1 n O Write command n 1 Write data Figure 2 55 SED1 200 Command Data Write Timing Command SET CURSOR DIRECTION CURSOR ADDRESS 1 1 CURSOR FONT SELECT CURSOR BLINK ON OFF DISPLAY ON OFF CURSOR ON OFF SYSTEM RESET LINE SELECT 1 St LINE Lli E CODE SET CGRAM ADDRESS SET CGRAM DATA 1 Refer to Figure Table 2 36 SED1200 Corr CS WR AO 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 ...

Page 106: ...REV A c Low 4 b t ID to D of Chafacle Code HexadeOmdl I 4 I 5 I 6 I 7 I 8 I 9 I A I B I c I i I 1 I cr RAM AREA I Figure 2 56 SED1 200 Character Code Map r 2 60 ...

Page 107: ...38 lists the sensors connected to the ROMA board Table 2 37 State Detection Circuits Name Description Sub CPU Signal Reference Reading Port Section 35 V Line Voltage Monitors the 35 V line voltage ANO 2 3 4 2 Detection Circuit VR1 Reading Reads the correction value for bidirec AN6 Circuit tional printing in the LQ mode 2 3 4 3 VR2 Reading Reads the correction value for bidirec AN5 C i r c u i t ti...

Page 108: ...sensor Printer Photo Detects the plat PA 1 2 3 4 7 mechanism interrupter en gap home position CR HP sensor Printer Photo Detects the car PAO 2 3 4 8 mechanism interrupter riage home position PE sensor Printer Mechanical Detects whether PB7 2 3 4 9 mechanism switch paper exists or not RL sensor Printer Micro switch Detects paper AN6 mechanism feeding meted LD sensor 2 3 4 10 Printer Micro switch De...

Page 109: ...s used to output the reference voltage SUB R71 AVCC CPU 7B D6 C42 VAREF E C48 AVSS 1 3 Ik 7 7 Figure 2 57 Reference Voltage Supply Circuit Reference voltage VAREF for the A D converter is determined by the combination of resistors R72 and R73 connected in parallel with the TL431 V F V 1 I f X R72 4 7 4 6 V where Iref 2 p A V f 2 495 V As shown by the above expression VAREF is regulated to approxim...

Page 110: ...tage drops to 30 53 V or less due to a circuit problem or high duty cycle printing the printer stops printing and the message ERROR 2 is displayed on the control panel on the LCD The printer cannot be recovered from this state The power must be turned off and then on again NOTE If ERROR 2 is displayed again after the printer power is turned off and on refer to Chapter 5 Troubleshooting v 35 a c 1 ...

Page 111: ...1 is used for bidirectional printing in the LQ mode and VR2 is used for bidirectional printing in the draft mode NOTE Refer to Section 4 3 6 for adjustment of VR1 and VR2 SUB CPU 7 B VAREF VR1 LQ FONT Bi d ADJUSTMENT VR2 DRAFT FONT Bi d ADJUSTMENT R103 R102 R 7 5 VR2 AN5 Ahh R83 AN6 T VR1 vs R 06 Figure 2 60 VR1 VR2 Reading Circuit Table 2 40 shows the relationship between the VR l VR2 value and t...

Page 112: ... n t i n g Ho If Speed Printing e 90 c t t Upper Limif Value w L s 80 C Lower Limit Value 5 G L K E u o 2 z Figure 2 62 Printhead Temperature and Printing Operation If the printhead temperature exceeds the upper limit 90 C printing is automatically stopped In this state the ON LINE LED blinks When the printhead temperature drops to the upper limit or less printing is resumed at half speed When the...

Page 113: ...ted by this sensor and carriage movement is controlled so that printing is executed to within 1 2 inch from either end of the paper SUB 7 VAREF 5 CN9 180 1 1 n Al 1 A xl 2 AN3 Y am JF 1 CPU 1 CM2 7 1 B 1 2 13 AVSS d Y 1 1 m 1 1 Paper Reflection Platen No reflection Figure 2 63 PW Sensor Circuit Table 2 42 shows the relationship between the PW sensor detection position and the voltage at the AN3 te...

Page 114: ...H 1 3 R2 10K 1 R8 SUB CPU I 78 33 5 CM2 6 v T A VSS I n I 1 Resistor for sensor gain adjustment 2 3 4 5 Touch control sensor Potentiometer VR for gain adjustment 8 V for constant voltage supply Thermistor for compensating for changes in paper thickness due to changes in temperature Figure 2 64 PT Sensor Circuit Figure 2 65 shows the relationship between the PW sensor detection value and the voltag...

Page 115: ...r n _ _ 71 R19 I I I 1 RI 8 SU8 CPU I R60 7 B I Y PA1 IJ l l Ii I CM 1 3 I I 1 1 J L L J _ T Figure 2 66 PG HP Sensor Circuit Table 2 43 shows the relationship between the PG gear flag and the voltage at the PA1 terminal of the sub CPU Table 243 PG Gear Flag and PA1 Voltage PG Gear Flag Position PA1 Terminal Voltage V At the home position 5 Outside the home position o 2 69 ...

Page 116: ... 1 1 SUB CPU 1 1 I 1 1 7 B t I I I PAO 1 1 JF 1 1 CM 1 5 1 I 1 1 1 1 Y J 1 I t I _ L _ l _ _ _ _ _ l Figure 2 67 CR HP Sensor Circuit Table 2 44 shows the relationship between the carriage flag and the voltage at the PAO terminal of the sub CPU Table 2 44 CR HP Sensor Flag and PAO Voltage I Carriage Flag Position I PAO Terminal Voltage V I At the home position 5 Outside the home position o 2 70 ...

Page 117: ... or not 5 A CN5 1 R5 l R30 B7 SUB CPU Y 7 B t I 2 J f 1 w Figure 2 68 PE Sensor Circuit Table 2 45 shows the relationship between the paper state and the voltage at the PB7 terminal of the sub CPU Table 2 45 Paper State and PB7 Voltage I Paper State I PB7 Terminal Voltage V I 1 Loading Paper exists 5 I Ejecting Paper out I o I 2 71 ...

Page 118: ...ws the relationship between the printer mechanism status ports AN6 and AN7 4 u and signals at the sub CPU Table 2 46 RL LD Sensor Circuit Signal Status PC7 Terminal Release Lever Loading Lever AN6 Sub CPU AN7 Sub CPU Voltage of the Position Position Terminal Voltage Terminal Voltage Sub CPU Level 1 Level H x x H H L Friction H Tractor L Open L Closed H Q 1 When the terminal voltage at PC7 is H the...

Page 119: ...Field R104 1 X2 AN 1 Hall Effect SUB CPU 7B T CM2 5 5 B A VS S n NOTE The output of the hall effect IC goes LOW HIGH when the IC moves close to away from the magnet Figure 2 70 Case Open Sensor Circuit Table 2 47 shows the relationship between the printer cover state and the voltage at the AN 1 terminal of the Sub CPU Table 2 47 Printer Cover State and AN1 Voltage Printer Cover State AN1 Terminal ...

Page 120: ...re activated and printing is executed The sub CPU monitors the printhead internal temperature to prevent the printhead coil from burning and also monitors the paper thickness and 35 V line voltage in order to apply the correct print energy to the printhead coils in accordance with the paper thickness AN4 ANO SUB CPU 7 B AN 1 PC7 coo DREQ AO MAIN CPU R 1 3A DO D17 MMIO1 MMU 1 4A i PT SENSOR CIRCUIT...

Page 121: ...05A02LA Gate Array Functions Address Bus AO Function o Inputs a command Data bit 7 Sets the data latch write sequence HIGH Ascending order LOW Descending order Data bit 6 Enables disables the HPW Data bit 5 Resets the counter Data bits 4 to O Not used 1 Latches data and increments the counter When latching data half protection is performed by NANDing the contents of the new data and the previous d...

Page 122: ...functions of each section are as follows 35 V Switching Transistor This transistor turns on when both printhead drive pulse HPW from the sub CPU and chopper type drive signal PNPON are LOW 35 V Power Transistor This transistor outputs 35 V to common lines P 1 through P8 when the 35 V switching transistor is on Printhead Coil Switching Transistor This transistor corresponds to outputs H 1 through H...

Page 123: ... 24 1A O 1 2 3 Approx 250 s at 35 V 25 C in the Draft self test mode when the paper thickness is normal Approx 220 u s at 35 V 25 C in the Draft self test mode when the paper thickness is normal First pulse width this varies depending on the paper thickness paper mode and the 35 V line voltage Refer to sections 2 3 5 3 and 2 3 5 4 Figure 2 73 Printhead Drive Circuit Signal Timing 2 77 ...

Page 124: ...paper thickness so that the correct print energy can by applied to the printhead coil Table 2 50 shows the relationship between the printhead coil drive cycle printhead first drive pulse width and print mode Table 2 50 Printhead Coil Drive Cycle Printhead First Drive Pulse Width and Print Mode Printhead Coil First Drive Pulse Width 2 Printing Mode CR Motor Printhead Speed Coil Drive Nomal copy cop...

Page 125: ...age To keep the energy W s J applied to the printhead coil constant the first drive pulse width of the PlWT5 N signal see Figure 2 73 is controlled by the sub CPU internal clock output from the COO terminal depending on the 35 Vline voltage Normol Mode 143 135 127 31 5 35 38 5 0 In 5 n 0 nml C opy Mode 2 K A Copy Mode I 128 120 I 12 108 loo 92 31 5 3 5 3 8 5 35 V Line Voltage V 35 V Line Voltage V...

Page 126: ...PuLSE 1 ON OFF input 0 D OS ON 0 GE IW ON 1 co gg n Acceleration I B 011 814 I control timer 2 phase v 1 R45 Y 1 1 h Figure 2 75 HF Motor T 35 SURGE VOLTAGE ABSORVING C I R C U I T y 1 J Control Drive Circuit ylyi o u t p u t I n t e g r a t i o n H C i r c u i t o u t p u t L Unstable Oscillation Circuit output L wJ lflflFrifl Ill 11111 11 111 A H 2 C p i n 1 3 O F F O N OFF ON L m k i ki t 1 8 H...

Page 127: ... signal is received 2 Integration Circuit When the output from the HF motor ON OFF circuit changes from HIGH to LOW it is integrated by this circuit and output to the block in the second stage Acceleration control is performed using this integrated waveform 3 Unstable Oscillation Circuit This circuit generates the reference clock to execute phase switching for the HF motor R43 is an oscillation fr...

Page 128: ... PF motor phase switching pulse generation respectively Based on these clocks the MCU generates CR and PF motor phase switching pulses drives stepper motor drivers IC S17304 7C CR motor and STK698 1 H 7D PF motor and rotates the CR and PF motors These motor driver ICS input a reference voltage that corresponds to the motor speed for the constant current control drive IC The CR and PF motor constan...

Page 129: ...ows these combinations Table 2 52 MCU 4B Address Allocations RST H L Eii H L AD3 x L H AD2 x L H L AD1 x L H L H L ADO SCK m Function Remark x x x Changes nothing L L H CR motor rotational c w Left to righ direction Carriage H L C c w Right to Ief H L H CR motor phase 2 2 H L switching 1 2 F E i rotationaona lPaper H L H PF motor phase 2 2 H L switching 1 2 Not used L L H OUT H POTO selection H L ...

Page 130: ... IC generates the TM 1 signal that includes a constant LOW pulse width even when the frequency of the reference clock output from the TO terminal of the sub CPU changes when acceleration deceleration or constant speed control is performed The LOW pulse width is set to approximately 25 ps by R25 and C 13 NOTE In the SUE CPU 78 MCU w w i 5 w 5s A c16 Figure 2 78 TM1 Clock Generation Circuit TO 7BI p...

Page 131: ...ng value for the current flowing to a coil of the CR motor varies The current limit is raised as the carriage speed increases by changing the voltage applied to the RX terminal R56 MMU POTO 34 VAvhv 4 B R57 S 1 7 3 0 4 POT1 3 5 2 0 Rx 7C Vvv 1 R55 POT2 R123 G7 Figure 2 80 Reference Voltage Generation Circuit Table 2 53 MCU POT Terminal States and Carriage Speed RX Terminal POT2 POT1 POTO CR Motor ...

Page 132: ...M so that a mean voltage is applied to the CR motor coil which keeps the CR motor current constant Refer to Appendix A 1 l 12 for details of the S17304 GH GH SURGE VOLTAGE ABSORVING CIRCUIT 1 t t SURGE VOLTAGE ABSORVING CIRCUIT 1 i t 1 f m Iiii l L I I CR MOTOR I 0 R 0 B W v E 6 12 BO1 3 4 C o l 7 3 AO1 R 9 3 f GH 16 51 6 7 i 9 1 0 11 18 Y Y Y Y LI 1 DA1 Dcl nRl DBD1 DD1 I 1 T T I DAC1 1 1 I T r T...

Page 133: ...REV A AIN 7C pin AOUT 7C pin 7C n NO 3 5 2 TE v 5 0 50 0 10 0 0 5ms Dl V In the Draft self test mode Figure 2 82 CR Motor Drive Circuit Signal Timing 2 87 ...

Page 134: ...used as the reference for chopper type driving Pulse Width Modulation control 5 Current Detection Resistors R93 and R88 Voltage is induced across the current detection resistor in proportion to the CR motor coil This voltage is input to the plus terminal of CMP1 CMP2 current that flows to the 6 Reference Voltage Generation Circuit The current applied to the CR motor coil is determined by the refer...

Page 135: ...re 2 83 shows the CR motor phase switching timing Table 2 54 shows the relationship between the CR motor speed and the phase switching system r TM1 I A N OFF 4 B CO1 o Bol N OFF ON DO1 OFF Step Rotation p p u u 1 1 u Ulnnr I t 1 I I I t 1 1 I I I 1 I 1 I I I r I I I I I I I I I I I I I I 1 2 3 4 5 6 7 8 1 C c w C w Carriage moves left to right a 2 Phase Excitation o I Step L I I I I I I I I I 1 2 ...

Page 136: ...Carriage Speed PPS 4000 2667 2000 1333 667 Cycle jdstep 250 375 5 0 0 750 1450 DPI dot inch 60 90 120 60 180 360 1 20 1 80 Print Mode Draft Condensed LQ Half speed Major mode draft Half LQ speed draft NOTE The carriage speed and cycle in the 1 2 phase switching system are converted to those in the 2 2 phase switching system S ...

Page 137: ...ting is performed after phase switching for 8 steps speed O orl or 16 steps speed 2 3 or 4 3 Deceleration Control When the speed is O or 1 the carriage is decelerated for 60 steps using 2 2 phase switching the speed is 2 3 or 4 the carriage is decelerated for 120 steps using 1 2 phase switching 4 High Speed Skip When When spaces 20H continue for 10 characters or more during text printing high spee...

Page 138: ... Speed Speed Speed High Speed Ski Printoble High Speed Skip COns Onl Acea Acceleration SCH Speed Area H i g h Speed Skip Control Range min 9CH Non printable Area min 10CH r 5 Figure 2 85 High Speed Skip J f r 2 92 ...

Page 139: ... inch Table 2 55 shows the various PF motor control relationships Table 2 55 Various PF Motor Control Relationships PF Motor Coil Paper Feeding Acceleration Mode Current A Coil Amount Inches Deceleration Remark Control Holding 0 07 0 01 Driving 0 8 1 s 46 360 Not performed Constant speed control 290 PPS 46 360 Performed At constant speed 1440 PPS 2 93 ...

Page 140: ...e PF motor coil The 35 V power supply voltage is applied intermittently to the PF motor coil from ACCOM and BCCOM so that a mean voltage is applied to the PF motor coil to keep the PF motor coil current constant Refer to Appendix A 1 l l 1 for details of the STK6981 H C57 35 4B 16 R54 16 D02 E 14 R52 1 4 B02 15 R53 7 C02 13 R51 5 A02 8 R95 r GH 5 PF MOTOR D16 1 1 I R98 17 DD T 5 D15 C34 3 5 I HOLt...

Page 141: ...REV A 5 AIN 7D pin 5 o A O U T 2 0 7D pin 4 o I 7D p n 8 o NOTE During form feeding Figure 2 87 PF Motor Drive Circuit Signal Timing 2 95 ...

Page 142: ... coil is determined by the reference voltage applied to the plus terminal of CMP1 or CMP2 4 0 5 CMP1 and CMP2 CMP 1 or CMP2 compares the reference voltage at the plus terminal to the voltage applied to the minus terminal which is from the current detection resistor R95 or R94 When the reference voltage is lower than the voltage across the current detection resistor the output goes LOW 6 Surge Volt...

Page 143: ...y the corresponding terminal A02 to D02 of the MCU 4 B The 2 2 phase switching system is employed Figure 2 88 shows the PF motor phase switching timing Tti2 ON A02 OFF ON C02 OFF ON B02 OFF ON D02 OFF Step I 1 I 1 2 3 4 Rotation C C W C W Forward paper feeding Figure 2 88 PF Motor Phase Switching Timing 2 97 ...

Page 144: ... the timer within the sub CPU which generates the phase switching pulses for the PG and CS motor drive circuits by sending commands to the MCU The PG and CS motors are driven using constant voltage PG MOTOR Cs MOTOR 3 5 5 Vx I 1 1 I HOLD DRIVE d c PG MOTOR DRIVER CIRCUIT PHASE PULSES I 1 I I GH 35 5 Vx A A A I I I 1 HOLD DRIVE CS MOTOR c DRIVER CIRCUIT PHASE PULSES CS UNIT I T POT1 C AO1 DO1 ADO 1...

Page 145: ...PG motor 2 2 phase H L switching 1 2 Not used H L L H CS motor C w Ribbon y M C B rotation H L direction C c w Coior B C M Y H L H CS motor 2 2 H L phase switching 1 2 Not used H L L L H POTO OUT H selection Pull up Not used H L OUT L H L H POT1 OUT H PG motor hold H L selection OUT L PG motor drive H L L H POT2 OUT H selection Pull up Not used H L OUT L H L H POT3 OUT H CS motor hold H L selectio...

Page 146: ...control factors 35 2 R9 PG MOTOR 1 44 5 B 1 7 1 Q13 o 4 Y R48 1 AAA 6 1 Q14 D 2 4 R49 I I Q7 A44 3 5 1 Q8 2 1 AO1 B O 1 c8u Col DO1 Figure 2 90 PG Motor Drive Circuit AOI 3B pin 013 Collect CV3 5 T 7 o I I I I II 1 I I u t tt H l H 50 or o 1 5V 50V i 5US Figure 2 91 PG Motor Drive Circuit Signal Timing Table 2 57 Motor Control Factors MCU 3B PG motor Remarks POT1 Applied Voltage V State High 5 Hol...

Page 147: ...ap see Section 2 1 2 2 During initialization after power is applied the PG motor is driven to set the platen gap starting from the platen gap home position determined by the PG HP sensor 1 2 mm from the platen The PG motor increments or decrements the platen gap in steps of 0 0014 mm Figure 2 93 shows the relationship between paper thickness and platen gap If the control panel is set a total of 10...

Page 148: ...has an adjustable speed control The CS motor drive circuit supplies regulated voltage to control the motor CS UNIT A02 C02 MCU 3 B 02 D02 POTC r l u PA1428H CS MOTOR I I 13 R34 6A 2 v Vvv Y I I 15 R33 Y I 1 1 b I 14 R32 Y AAA 8A 6 I Y I I 9 D I 16 R31 AAA 9A 8 I Y I I I I I lo 1 35 5 I I A I Vx I COM R40 17 Q4 I l 4w I J I Figure 2 94 CS Motor Drive Circuit Table 2 58 Related Factors for CS Motor ...

Page 149: ...I I I I I I I 2 3 4 c C W C W Color ribbon B C M Y 2 95 CS Motor Phase Switching Timing Color Ribbon Switching Control When power is applied a color home position seek is performed This operation mechanically determines the color home position by rotating the CS motor counterclockwise for 150 steps 120 steps are used for actual movement 120 150 n steps cannot be adjusted See Figure 2 1 3 The ribbo...

Page 150: ...ectly by the sub 35 CPU 7 B Vx 6B 5 PA4 RL SOLENOID d 6B A 6 PA5 1 3 5B 7 PA6 1 1 1 Figure 2 96 PT RL LD Solenoid Drive Circuit SUB CPU 7 B Table 2 59 Related Factors for PT RL LD Solenoid Control Solenoid Sub CPU control port Solenoid state PT PA6 HIGH Not driven LOW Driven 35 J RL PA5 HIGH Not driven LOW Driven 35 M LD PA4 HIGH Not driven LOW Driven 35 M PA6 7B pin 7 013 Collector CV3 5 I I o H_...

Page 151: ...te errors Figure 2 98 shows the buzzer drive circuit and Figure 2 99 shows the its pulse timing Vx R7 3 3K F3zl o 10 11 8 PA7 SUB CPU R35 7 B IK Figure 2 98 Buzzer Drive Circuit Buzzer on stote PA7 7B pin 8 6B pin 10 Buzzer Figure 2 99 WI 5 0 5 0 sounds when there is no paper Buzzer Drive Circuit Pulse Timing 2 105 ...

Page 152: ...nsor PG ADJUST No T I PWS SCANNING T PAPER OUT Platen surface voltage measurement using the PW sensor PAPER THICKNESS EIF I Paper end voltage e sensor i l CR CENTERING PAPER CENTER I I CR CENTERING 40COI I I P A P E R F E E D T O F I I PRINTING 1 Figure 2 100 Printer Mechanism Initialization Sequence 1 NOTES 1 For the setup operations marked with a use the value stored in the back up memory 2 The ...

Page 153: ...t measurement detected by the PT sensor W OUS PAPER PAPER THICKNESS EZFI s n ensor ai s n ensor 1 CR CENTERING 40COI I I I I PAPER FEED T O F I I 1 4 I PRINTING I NOTE For the setup operations marked with a use the value stored in the back up memory Figure 2 101 Printer Mechanism Initialization Sequences 2 2 107 ...

Page 154: ... 3 2 OPTIONAL INTERFACES 3 1 3 2 1 8143 Interfece Board 3 2 LIST OF TABLES Table 3 1 Optional Interfaces 3 1 Table 3 2 8143 Jumper Settings 3 2 Table 3 3 DIP Switch Settings 3 3 Table 3 4 Bit Rate Selection 3 3 Table 3 5 8143 Handshaking Control 3 3 S i ...

Page 155: ... interface Buffer Size Flag Control X ON OFF Max Bit Rates Control BPS RS 232C 8 143 None o 0 19200 8 145 2K o x 9600 8 148 2K 8K o 0 19200 Current Loop 8 149 32K o 0 19200 8 149M 128K o 0 19200 Buffer Size Function Listen Only Address Operation Operation IEEE 488 816 1 None L x 0 o G P IB 8 1 6 5 2K 8K AH L DC o 0 O Available X Not available Refer to section 3 2 1 NOTES 1 Refer to the Optiorlal I...

Page 156: ... cable if connected should be disconnected before using the 8143 board because parallel interface input is used to read jumper settings and DIP switch status Jumper Settings Table 3 2 shows the 8143 interface jumper settings Table 3 2 8143 Jumper Settings Function J1 ON _lTY TXD is pulled up to 12V through 470 ohm resistor I J2 I ON TTY TXD RET is connected to signal ground I J3 ON TTY RXD is pull...

Page 157: ...N ON ON 1 800 OFF ON ON ON 110 ON ON ON OFF 2 400 OFF ON ON OFF 134 5 ON ON OFF ON 4 800 OFF ON OFF ON 150 ON ON OFF OFF 9 600 OFF ON OFF OFF 200 ON OFF ON ON 19 200 OFF OFF ON ON 300 ON OFF ON OFF 19 200 OFF OFF ON OFF 600 ON OFF OFF ON 19 200 OFF OFF OFF ON 1 200 ON OFF OFF OFF 19 200 OFF OFF OFF OFF NOTE In the current loop operation normal data transfer cannot be guaranteed at a bit rate great...

Page 158: ...ery Removal 4 13 4 2 4 6 Cooling Fan Removal 4 14 4 2 5 Printer Mechanism Disassembly 4 15 4 2 5 1 4 2 5 2 4 2 5 3 4 2 5 4 4 2 5 5 4 2 5 6 4 2 5 7 4 2 5 8 4 2 5 9 4 2 5 10 4 2 5 11 4 2 5 12 4 2 5 13 4 2 5 14 Printer Mechanism Removal 4 15 Color Select Unit Removal 4 16 Cartridge Base Removal 4 17 Cable Removal Front Head Cable Rear Head Cable Color Select Cable 4 18 Paper Tension Assembly Removal ...

Page 159: ...ide Shaft B and Platen 4 42 Platen Gap Home Position Sensor Mounting Position Adjustment 4 44 Platen Gap Initial Value Write Operation 4 46 Bi directional Printing Alignment 4 47 TABLE OF FIGURES Figure 4 1 External View of LQ 2550 4 1 Figure 4 2 Transport Screws 4 2 Figure 4 3 Printhead Protector and White Foam Packing Material Installation 4 2 Figure 4 4 Printer Disassembly Procedures 4 5 Figure...

Page 160: ...Front Head Cable Rear Head Cable and Color Select Cable Removal 4 18 Figure 4 31 Paper Tension Assembly Removal 4 19 Figure 4 32 Belt Driven Pulley Screw Removal 4 20 Figure 4 33 Carriage Motor Removal 4 20 Figure 4 34 Paper Feed Motor Removal 4 21 Figure 4 35 Platen Gap Motor Screw Removal 4 22 Figure 4 36 Platen Gap Motor Removal Back of Base Frame 4 22 Figure 4 37 Head Fan Motor Connector Remov...

Page 161: ...Figure 4 59 Paper Guide Plate Orientation 4 33 Figure 4 60 Paper Holding Roller Assembly Removal 4 34 Figure 4 61 Left Frame Removal l 4 35 Figure 4 62 Left Frame Removal 2 4 35 Figure 4 63 Printer Mechanism with Left Frame Removed 4 35 Figure 4 64 Leaf Spring Mounting Orientation 4 36 Figure 4 65 Platen Gap Gear Assembly Installation 4 36 Figure 4 66 Paper Feed Spring Removal Back of Base Frame 4...

Page 162: ...ment 4 45 Figure 4 81 Platen Gap Initial Value Write Sequence 4 46 Figure 4 82 Bi directional Printing Alignment Value Adjustment Section 4 46 Figure 4 83 Bidirectional Printing Alignment Sequence 4 48 LIST OF TABLES Table 4 1 Repair Tools 4 3 Table 4 2 Measuring Instruments 4 3 Table 4 3 Lubricants and Adhesive 4 3 Table 4 4 Abbreviations for Small Parts 4 4 Table 4 5 Screw Types and Abbreviated ...

Page 163: ...replacing any of the main components of the LQ 2550 Figure 4 1 shows the external view of the LQ 2550 Sheet Guide Guide idge Cover Printer Cover Push Tractor Paper Supprot Printhead Knob Roller Shaft Gro nd Connector Po er Switch Parallel Interface P1 aten Paper Guide AC Inlet Figure 4 1 External View of LQ 2550 4 1 ...

Page 164: ...formed by reversing the order of installation Refer to Figures 4 2 and 4 3 For transportation the protective parts should be installed in the printer as follows 1 Secure the two transport screws 2 Slide the printhead all the way to the left then insert the printhead protector between the platen and the paper holding roller shaft 3 Install the three pieces of white foam packing material Papef Figur...

Page 165: ...m across A Tension gauge 7000 g E668 B777200301 A Thickness gauge 1 2 mm E667 B77670150 1 A Adjustment Cartridge E658 Y499035020 A Dial gauge E 672 B7651 11401 A Dial gauge base E 671 B7651 11801 A Extension cable E 649 B765 109801 A Availability Class O Commercially available tool A Mandatory EPSON exclusive tool B Recommended Table 4 2 Measuring Instruments Designation Specification Class Oscill...

Page 166: ...d washer CPS P Cross Pan head S tight with Plain washer CP o Cross Pan head with Outside toothed washer CP P Cross Pan head with Plain washer HNO Hexagon Nut with Outside toothed lock washer Pw Plain Washer LS Leaf Spring RE Retaining ring type E Table 4 5 describes the relationship between the form of screw and its abbreviated part name Table 4 5 Screw Types and Abbreviated Part Names Head B xiy ...

Page 167: ... printer mechanism h WARNING 1 Read Section 4 1 General Repair Information before disassembling the printer Remove the paper and the ribbon cartridge when disassembling the printer The disassembly sequence in this section is grouped into five parts 1 removal of the printhead 2 removal of the upper case 3 removal of the tractor unit 4 removal of the circuit boards and 5 disassembly of the printer m...

Page 168: ...rs Step 2 Remove the two screws CS M3X 6 securing the printhead Step 3 Disconnect the printhead connector by lifting the printhead and remove the printhead Figure 4 5 Printer Covers Removal Cs M3x 6 A Printhead p r i n t e r over Figure 4 6 Printhead Removal c y 4 6 ...

Page 169: ...ift the front edge of the upper case and move it backward Disconnect connector CN21 on the ROMA board and remove the upper case Printer Cover Cartridge Cover ter Cover PaDer Feed Knob Figure 4 7 Upper Case Removal 1 pTcase at7paperGuide CBB M4 X 12 Figure 4 8 Upper Case Removal 2 Figure 4 9 shows the arrangement of the main components of this printer upper case ROPS Board ROMA BOARD Power Supply B...

Page 170: ...actor Unit Removal Remove the upper case Refer to Section 4 2 2 Remove the two screws CBS M3 X 6 securing the push tractor unit to the printer mechanism Remove the push tractor unit Figure 4 10 Push Tractor Unit Removal ASSEMBLY POINT Mount the push tractor unit as shown in Figure 4 11 CBS M3x6 Push Tractor Unit r w Paper Guide c LJ U 4 4 Shaft Dowel t 9 Figure 4 11 Push Tractor Unit Mounting 4 8 ...

Page 171: ... then remove the frame Remove the E ring RE 5 from the shaft Push the tractor lock lever backwards and remove the left tractor a embly from the shafts Tractor RE 5 HNO M4 J CPS h M3X 6 Tractor Frame I Figure 4 12 Left Tractor Assembly Removal ASSEMBLY POINT When mounting the tractor assemblies on the shafts set them so that the marks on the right and left tractor frames are at the same positions M...

Page 172: ...pper case Refer to Section 4 2 2 Remove the push tractor unit Refer to Section 4 2 3 1 Disconnect connector CN22 from the ROMA board which connects the ROMA board to the ROPS ROPSE board L Disconnect fourteen connectors CN15 CN 14 CN 13 CN 12 CN 11 CN 10 CN9 CN 16 CN8 CN 19 CN20 CN 17 CN 18 and CN7 from the ROMA board which connect the printer mechanism to the ROMA board Remove the shield plate an...

Page 173: ...rd Removal Remove the upper case Refer to Section 4 2 2 Remove the push tractor unit Refer to Section 4 2 3 1 Disconnect connector CN2 from the ROPS ROPSE board which connects the ROPS ROPSE board to the ROMA board Disconnect connector CN 1 from the ROPS ROPSE board which connects the power switch to the ROPS ROPSE board Remove the two CBB M3X 12 screws and four CP 0 M3X8 screws securing the ROPS ...

Page 174: ...el which connects the control panel to the ROMA board Step 4 Remove the control panel CBB CBB M4 X 12 Connector Control Panel M4 X 12 Figure 4 16 Control Panel Removal 4 2 4 4 Case Open Sensor Removal Step 1 Remove the upper case Refer to Section 4 2 2 Step 2 Remove the screw CBB M3X 10 securing the case open sensor then remove the case open sensor Upper Case 3 CBB M3x 12 Figure 4 17 Case Open Sen...

Page 175: ...ove the battery together with the battery case CN7 I Battery Case Screwdriver K1I iGIroow Figure 4 18 Battery Removal ADJUSTMENT REQUIRED When connector CN7 for the battery is disconnected perform the following adjustment Section 4 3 5 Platen Gap Initial Value Write Operation Page 4 46 ASSEMBLY POINT When mounting the battery push down the tab of the battery case with a slotted screwdriver so that...

Page 176: ...3 X 12 securing the base plate to the lower case CBB M3x 12 CPS o CPS o M3X6 M3x6 CBB M3x 12 CBO M4 X 6 Base Plate Groun Plate Power Cord Figure 4 19 Base Plate Removal Step 8 Remove the two ground screws CPS 0 M3 X 6 at the rear of the printer then remove the base plate Step 9 Tear off the three pieces of tape fixing the cooling fan wires to the lower case Step 10 Remove the two screws CBB M4 X 1...

Page 177: ...ism to the ROMA board Remove the eight screws CPS 0 M3X 6 securing the ground plates then remove the four ground plates See Figure 4 1 9 Remove the five screws CB M4 X 6 securing the printer mechanism to the lower case Remove the printer mechanism CN15 CN 13 CN 12 N1 CJ9 c l J16 I CN8 CN19 CN20 CN17 CN 18 Figure 4 22 Connector Locations CB M4x6 Printer Mechanism ROMA Board CB M4 X 6 CB M4X 6 Figur...

Page 178: ...printer cover Turn the lever on the color select unit counterclockwise select unit Remove the color select unit by lifting it straight up 90 degrees to unlock the color Color Lever Se Figure 4 24 Color Select Unit Removal 1 Color Select Unit t J c Figure 4 25 Color Select Unit Removal 2 4 16 ...

Page 179: ...tabs Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Remove the printhead Refer to Section 4 2 1 Step 3 Remove the screw CB M4X8 securing the cartridge base to the carriage Step 4 Release the three tabs at the back of the cartridge base then remove the cartridge base by lifting it straight up 1 1 I Tab Figure 4 26 Cartridge Base Removal 1 Tab T w e e z e r s Figure 4 27 Cartrid...

Page 180: ...rtridge base Refer to Section 4 2 5 3 Remove cable holders A and B then draw out the three cables the front head cable rear head cable and color select cable from the cutout in the base frame Place the carriage over the cutout in the base frame then disconnect the two connectors from the back of the base frame Remove the color select unit Refer to Section 4 2 5 2 Loosen the three cables from the t...

Page 181: ...t and left frames take care not to drop the plain washers PW 3 O 54 8 inserted between the paper tension assembly and both frames Step 1 Remove the upper case Refer to Section 4 2 2 Step 2 Remove the two screws CPS M3X8 securing the paper tension assembly to the right and left frames and remove the paper tension assembly CPS M3X8 Paper Tension Assembly CPS M3X 8 Figure 4 31 Paper Tension Assembly ...

Page 182: ...tor to the base frame Step 4 Remove the CPS 0 M3X 8 screw for the motor ground wire from the base frame Step 5 Remove the carriage motor CBS 0 M4X 12 Timing Belt Figure 4 32 Belt Driven Pulley Screw Removal Carriage Motor Motor Ground Wire CPS o CPS M3X8 M3x 8 Figure 4 33 Carriage Motor Removal Belt Drive Pulley Carriage Mot ADJUSTMENT REQUIRED When the carriage motor is removed perform the follow...

Page 183: ...Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Remove the two screws CPS M3X8 securing the paper feed motor and remove the motor 13x 8 Feed M3X8 Figure 4 34 Paper Feed Motor Removal ADJUSTMENT REQUIRED When the paper feed motor is replaced perform the following adjustment Section 4 3 2 Paper Feed Motor Backlash Adjustment Page 4 4 1 4 21 ...

Page 184: ...ve the wire clamp fixing the lead wires of the platen gap motor from the base frame Take out the platen gap motor through the cutout at the back of the base frame then separate the lead wires from the motor by disconnecting the connector The lead wire is supplied independently of the platen gap motor The motor lead wire is included in the platen gap home position sensor assembly Platen Gap Reducti...

Page 185: ...ead fan motor and the paper width sensor at the back of the base frame Loosen the lead wires of the head fan motor and the paper width sensor from the hooks of the ribbon drive assembly and the carriage Remove the screw CPS M3X 6 securing the ribbon drive assembly then shift the assembly in the direction of the arrow Remove the screw CPS M3 X 61 securima the head fan motor and remove the motor Con...

Page 186: ... E ring RE 8 from the platen shaft at the left frame side Shift the whole platen shaft to the right then remove the right side of the shaft holder outward Remove the platen with the gears and other related parts attached NOTE It is unnecessary to remove the left side of the shaft holder R 8 I PaDer Release Lever I I Shaft Holder right side Y s I 7 7 2 1 Plate Gear Figure 4 40 Platen Removal ADJUST...

Page 187: ...e 4 41 Ca age Home PosNlon Sensor Removal 4 2 5 12 Paper End Sensor Removal Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Loosen the two bends securing the paper end sensor to the paper guide at the rear of the printer Step 3 Remove the paper end sensor Bend Paper End Sensor paper Guide Figure 4 42 Paper End Sensor Removal Rear of Printer Mechanism ASSEMBLY POINTS Confirm tha...

Page 188: ...8 securing the platen gap home the platen gap home position sensor assembly CPS P M3x8 Platen Gap Home Position Sensor from the platen gap motor of the base frame position sensor then remove Connector for Platen Gap Motor Figure 443 Platen Gap iome Position Sensor Assembly Removal ADJUSTMENT REQUIRED When the platen gap home position sensor mounting position is shifted perform the following adjust...

Page 189: ... to Section 4 2 5 3 Step 4 Place the carriage over the cutout in the base frame then disconnect the connector for the paper width sensor from the back of the base frame Step 5 Remove the screw CB M2 5X5 securing the paper width sensor and remove the sensor Figure 444 Paper Width Sensor Connector Removal Back of Carriage L Paper Width Sensor B2 5X5 Figure 4 45 Paper Width Sensor Removal 4 27 ...

Page 190: ...ion 4 2 5 10 Remove the tractor transmission gear and the paper release lever by pushing the loading trigger plate in the direction of the arrow Remove the two screws CB M2X8 and CPS M3X8 securing the paper release solenoid assembly one is for sensor and the other is for solenoid then remove the paper release solenoid assembly sensor and solenoid Paper Release Lever Tractor Transmission Loading Tr...

Page 191: ...ires Before mounting the paper release lever confirm that the paper release planetary lever and the release trigger plate are in their correct positions as shown in Figure 4 49 The positional relationship between paper release lever and paper release support lever is shown in Figure 4 50 2 Paper Release Planetary Lever c Figure 4 49 Positional Relationship Between Release Planetary Lever and Relea...

Page 192: ...and the loading gear assembly Remove the two screws CB M2X 8 and CPS P M3 X 8 securing the paper loading trigger assembly one is for sensor and the other is for loading frame then remove the paper loading trigger assembly Remove the loading planetary gear from the paper loading trigger assembly bly Lever Lever Shaft oadim spriw Loading Gear Assembly Figure 4 51 Paper Loading Trigger Assembly Remov...

Page 193: ...nd the planetary gear should follow the platen gear when it rotates When pressing the loading trigger plate in the direction of the arrow the loading planetary gear should engage loading gear A so that the rotation of the platen gear is transmitted to the loading gear If the loading planetary gear does not work well adjust it using the screw CPS P M3X 8 securing the loading frame I 1 r 1 Loading L...

Page 194: ...r assembly Wire Clamp 4 m m Carriage Home Position Sensor Wire rm Figure 55 Paper Thickness Sensor Assembly Re oval 1 Paper Thickn s Frame a Figure 4 56 Paper Thickness Sensor Assembly Removal 2 ADJUSTMENT REQUIRED When the paper thickness sensor assembly is removed perform the foIlowing adjustments Section 4 3 1 Timing Belt Tension Adjustment Page 4 40 Section 4 3 2 Paper Feed Motor Backlash Adju...

Page 195: ...izontally toward you then tilt and remove it so as not to damage the ribbon mask The paper guide plate cannot be removed upward Paper Guide Plate Spring Figure 4 57 Paper Guide Plate Spring Removal Back of Base Frame Paoer Guide Plate Figure 4 58 Paper Guide Plate Removal ASSEMBLY POINTS When mounting the paper guide plate verify the orientation of its top as shown in Figure 4 59 P Platan Paper Gu...

Page 196: ...rings RE 3 fixing the right and left paper holding levers to both frames Remove the left paper holding lever from the shaft Shift the whole paper holding roller shaft then remove the paper holding roller assembly by rotating it in the direction of the arrow Right Paper Holdin9 ever RE 3 paper Holding Lever Sprin9 RE 3 Figure 4 60 Paper Holding Roller Assembly Removal f U 4 34 ...

Page 197: ...move the ribbon drive wire spring and the ribbon drive wire Step 7 Remove the screw CBS 0 M4 X 12 securing the belt driven pulley mounting plate Step 8 Remove the screw CP P M3 X 6 securing the platen gap gear assembly on carriage guide shaft B then remove the platen gap gear assembly and the leaf spring LS 8 2 O 25 1 5 Step 9 Remove the nut HNO M4 securing carriage guide shaft A to the left frame...

Page 198: ...Leaf Spring Mounting Orientation When installing the platen gap gear assembly shift one cog at the end of the gear so as to true up the edge of the two gears at the other end This ensures that the platen gap gear assembly will rotate without backlash Platen Gap Gear Assembly Figure 4 65 Platen Gap Gear Assembly Installation Install the ribbon drive wire as following procedures Mount the ribbon dri...

Page 199: ...he base frame Step 7 Remove the paper feed roller shaft then remove the paper feed roller assembly from the shaft Paper Feed Spring Figure 4 66 Paper Feed Spring Removal Back of Base Frame Paper Thickness Sensor Assembly Paper Feed Roller Paper Feed Roller Shaft Figure 4 67 Paper Feed Roller Assembly Removal ADJUSTMENT REQUIRED When the paper feed roller assembly is removed perform the following a...

Page 200: ...elt drive pulley at the rear of the carriage motor CPS Timing Belt M3x 8 Fixing Plate fi Figure 4 68 Timing Belt Removal 1 Back of Base Frame Timing Belt Figure 4 69 Timing Belt Removal 2 wr ve ADJUSTMENT REQUIRED When the timing belt is replaced or loosened perform the following adjustment Section 4 3 1 Timing Belt Tension Adjustment Page 4 40 ASSEMBLY POINT When attaching the timing belt to the ...

Page 201: ...hould be performed to ensure proper operation The adjustment sequence is shown in Figure 4 71 Description Y START 4 32 t 4 41 433 t 4 42 Timing Belt Tension Paper Feed Motor Parallelism Adjustment Adjustment Backlash Adjustment Between Carriage Guide Shaft B and Platen t 4 3 4 4 4 4 Platen Gap Home Position Sensor Mounting Position Adjustment t 4 3 5 4 4 6 Platen Gap Initial Value Write Operation ...

Page 202: ...Verify that the timing belt is correctly inserted into the bottom of the carriage Step 3 Loosen the screw CBS 0 M4X 12 on the belt driven pulley mounting plate Step 4 Adjust the belt tension using a tension gauge Tension value 5000g 500g Step 5 Tighten the screw CBS 0 M4 X 12 on the belt driven pulley mounting plate T unting c i Plate Figure 4 72 Timing Belt Tension Adjustment 4 40 ...

Page 203: ... to Section 4 2 5 1 Loosen the two screws CPS M3 X 8 securing the paper feed motor Manually rotate the paper feed motor and adjust the backlash between the pinion and the paper feed reduction gear Allowable backlash 0 05mm to 0 1 mm Tighten the screws CPS M3X8 on the paper feed motor ear M3X8 per Feed Motor Paper Paper Feed Motor L o Figure 4 73 Pinion Paper Feed Motor and Paper Feed Reduction Gea...

Page 204: ...e feeler of the gauge touches the platen and that the long needle registers 15 to 20 units higher on the scale than when the feeler does not contact the platen and fix the dial gauge with the hexagonal screw Set the limiters left and right at 1 5 and 1 5 on the scale Step 10 Rotate the outer frame of the dial gauge and so that the long needle points to O Step 1 1 While pushing the lift lever move ...

Page 205: ...ap Reduction Gear Q Q Platen Gap Gear Platen Gap Motor Pinion y Carriage Guide Shaft B 0 0 Figure 4 75 Platen Gap Motor Gears Series Platen Cs ase Hexa Figure 4 76 Dial Gauge Base and Dial Gauge Positions and Names of Parts I 1 ma I _ Right Frame x Platen Gap Wide Platen Gap Narrow CPS P M3x 8 Head Adjustment Lever Figure 4 77 Head Adjustment Lever Mounting Position Adjustment 4 43 ...

Page 206: ... Loosen the CPS P screw M3 X 8 securing the platen gap home position sensor See Figure 4 80 Connect extension cable E649 modified cable see Figure 4 79 between the ROMA board CN 16 and the 9 pin connector of the printer mechanism Step 10 Attach the probe of either the oscilloscope or multi meter digital type to CN 16 of the ROMA board Connect the plus and minus probes to pins 8 and 9 respectively ...

Page 207: ...latan rinthead p Wide Carriage Guide haft B Gap Narrow b Platen Gap Adjustment Figure 4 78 Platen Gap Adjustment 0MAB0ardcN16 F7 nnect0r NOTE Remove cables for pins 1 to 5 Figure 4 79 Extension Cable E649 Modification CPS P 3x 8 Platen Gao Home Position Sensor roow w Platen Gap Gear Backward k P fvt3x13 l Pla en Gap Home Position Flag Match Mark Figure 4 80 Platen Gap Gear Mounting Position Adjust...

Page 208: ...ss either the FORM FEED or LINE FEED switch once The LCD displays XWrite PG Voltage and the A and V LEDs blink Step 4 Press the LOAD EJECT Q switch The printer measures the platen gap four times in each once per 1 4 rotation of the platen of the friction and push tractor modes and stores the mean value of the four measured values for each mode in the memory as the initial platen gap When the write...

Page 209: ...ayed on the LCD as T xx If the characters on the odd numbered lines are shifted to the right press to shift the characters to the left If is pressed after the alignment value is set the alignment value displayed on the LCD is added and 1 l characters are printed again for four lines When the correct alignment value is set press The LCD displays Tar xx VR2 xx Adjust VR2 using either a Philips or st...

Page 210: ...nk Press The printer returns to the menu selection mode Step 5 If H is pressed the printer executes test printing at each of five printing speeds and the LCD displays All mode print test After all the test printing is completed the printer returns to Step 5 Press The LCD displays the initial message x Bi D Adjustment Turn the printer power off and remove the adjustment cartridge o START b St epl o...

Page 211: ...c System 5 4 Figure 5 4 RS 232C l F Cable Circuit 5 5 Figure 5 5 Printhead Connectors F and R Wiring 5 16 Figure 5 6 Relationship Between Printhead Temperature and Thermistor Resistance 5 16 Figure 5 7 ROPS ROPSE Board Block Diagram 5 17 Figure 5 8 AC Connector for Measuring Instruments 5 1 7 Figure 5 9 Q2 Output Ql Input Voltage Waveforms 5 20 Figure 5 10 Q1 Input Output Voltage Waveforms 5 20 Fi...

Page 212: ...r Diagnostic System 5 5 Replacement Unit Numbers 5 6 Symptoms and Reference Pages 5 7 ROPS ROPSE Board Output Voltages 5 8 Relationship between Common Wires and Each Coil 5 16 ROPS ROPSE Board Unit Repair 5 18 ROPS ROPSE Board Voltage Waveforms 5 20 ROPS Board Main Parts List 5 22 ROPSE Board Main Parts List 5 22 ROMA Board Main Parts List 5 23 Electric Device List 5 24 S ii ...

Page 213: ...perform Here is a simple procedure provided to perform troubleshooting START I I I I Fault checking with the diagnostic tool I I Unit Replacement I I J I J I L I I I I Fault is corrected Figure 5 1 Troubleshooting Procedure Table 5 1 lists the troubleshooting tools contained in the printer 5 1 ...

Page 214: ...e 5 pin Between ROMA board CN 12 and PT sol BQ765 105501 noid and PT sensor E512 Cable 6 pin Between ROMA board CN 17 and CR motor B765 102701 Between ROMA board CN 18 and PF motor E649 Cable 9 pin Between ROMA board CN 16 and PG motor and B765 109801 PG home position sensor E659 Cable 18 pin Between ROMA board CN9 and HF motor CS B7651 10801 motor and PW sensor Between ROMA board CN 10 and printh...

Page 215: ...REV A EEEl n R O M A B O A R D m CJ P R I N T E R MECHAN SM Figure 5 2 Extension Cable Connections 5 3 ...

Page 216: ...nostic program with the computer The host computer sends the test programs to the printer which then executes them The host computer receives the test program results back from the printer and determines the status of the printer Figure 5 3 and Table 5 2 show this diagnostic system r 1 RS 232C I Host Computer rinter Diagnostic I EPSON PCIEQUITY cortridge I 25 Pin SLOTA r I II r 1 I II 0 0 I I I l ...

Page 217: ...e Operational manual D SUB 25 pin l F cable AMPHENOL 36 pin l F cable z xl The RS 232C l F cable circuit is shown in Figure 5 4 X2 It is useful when performing the test printing to use the 8 bit parallel interface CN3 1 FG 10 01 TXD 20 0 2 RXD 30 0 3 CTS 50 011 0 2 0 SG 70 0 7 FG TXD RXD REV DTR SG Host Computer VF Cable LQ 2550 Figure 54 RS 232C l F Cable Circuit 5 5 ...

Page 218: ... Battery Unit Lithium battery Y454504000 ROMA Board Control board Y456201 200 Fan Unit Fan motor Y456503000 Panel Unit ROPNL W board Y45650 1000 8 C 2 Case open sensor Y456305000 Model 5560 Printer mechanism exclude printhead Y456590000 Printhead 24 pin dot head F4 18000000 CS Unit Color select unit F344902000 WARNINGS 1 Before starting any unit replacement confirm that all connectors are connecte...

Page 219: ...ot is missing In the self test or nor mal printing mode b When using a color Printing positions are misaligned during color printing 5 12 ribbon mixed color violet orange and green In the self test mode Printing colors are not switched correctly Abnormal paper feed The paper feeding method and the paper being used do 5 13 not match Line feeding is not uniform during printing LD solenoid paper hold...

Page 220: ...easure v Reploce the fuse ond disconnect connector CN2 on the ROPS ROPSE board is turned on ogain doee the output valtage I I Re lace Connect CN2 on f the ROPS OPSE baord the ROPS ROPSE boord Disconect connecters on the ROMA board except CN8 CNII and CN22 rinter power is turned on Reploce the ROMA baard Reploce the fan unit Connect 011 the connectors on the ROMA board printer power is turned on R ...

Page 221: ...er is turned on e the mechanisms initialize I CD display ERROR 10 Replace the printer mechanism m Use progrom ROMS I CD display ERROR 2 with the same version number for the main b and sub CPUS IN I Confirm that each CD display ERROR O C G ROM D is inserted correctly Replace the ROMA board I 5 9 ...

Page 222: ...N ontinuous poper s e ot the printing start Select FRICTION usin the 1 PAP R SELECT switch ontinuous poper fed in he reverse direction I Load a cut sheet from the upper paper entrance I I Is the aper release mechanism N et to the friction DEE24 Is the fault corrected Ne 5 10 ...

Page 223: ... the printer power on while pressing both the LINE FEED Align the bi di recti onal erti cat I ines ruled lines printing positions Refer to Section Measure the 2 resi stance value of the printhead t her mi st or 1 Y N the resistance values I Replace the printheod I N I 1 the fault I P ce I 3 Y within the DaDer I R epl ace the printer mechonism 1 Refer to Figure 5 5 and Table 5 6 2 Refer to Figure 5...

Page 224: ...chanism I I t Perform the self test Align the printing Reploce positions for the ROMA board color printing viol et or Of198 d green are printing Posltlo bi directional print ing Refer I Ja sec 43 L v switching performed correctly g Confirm whether the CS unit operates correctly by observing the up and down movement of the color ribbon cartridge and rotational noise of the CS motor 5 12 ...

Page 225: ... printer power paper feeding metho on and select the feed be selected usin corresponding paper feeding system using he PAPER SWCTSW itc Y mount of line feeding var Replace the printer mechanism oes the LD solenoid open o the fault corrected ND X 5 13 ...

Page 226: ... forth a few centimeters and he corresponding LED is lit I I 1 I r Replace the printer mechanism switch and LED operate the fault corrected the massage MEMORY CLEAR the battery unit 4 Replace the ROMA board 1 The MICRO FEED switch is only valid when paper is loaded in the printer mechanism OFF switch is only valid when continuous paper is loaded in the printer mechanism The TEAR f h 5 14 ...

Page 227: ... interface between the printer and host computer II Check the interfoce cable between the I printer and host computer as follows Change the settings Are the signal connections correct 1 1s the interface cable connected firmly I the fault corrected N xl 8 Bit parallel Refer to Section 1 3 1 RS 232C Serial Refer to Section 1 3 2 5 15 ...

Page 228: ...e 5 6 Relationship Between Printhead Temperature and Thermistor Resistance If a specific dot is not printed one possible cause is a defective printhead coil refer to Figure 1 2 for the relationships between the coil numbers and wire pins Whether the coil is defective or not is determined by measuring the resistance across the terminals of the common line and corresponding coils refer to Figure 5 5...

Page 229: ...10 list the parts used in the ROPS ROPSE board DANGER 1 Before checking anything using the measuring instruments check that there are no metal chips inside and that there are no burned components 2 Since this power supply is an isolated switching regulator do not use a grounded measuring instrument such as a multimeter or oscilloscope If a grounded instrument is used fuse F 1 may burn out Be sure ...

Page 230: ... 1 Approx 10 7 V Check the voltage between pins 1 Measure the voltage and 2 of ICI Approx 7 4 V between A and K of ZD1 or replace IC 1 rhe 12 V line is Fuse resistor RI 9 R21 Measure the resistance across Replace R19 R21 ead is open R19 R2 1 Approx 3 1 ohms rhe 12 V line is Fuse resistor R22 R25 Measure the resistance across Replace R22 R25 dead is open R22 R25 Approx 3 1 ohms 4n abnormal voltage ...

Page 231: ... of Q3 Q4 See Figure 5 12 Observe the voltage waveform be tween the drain and souce of Q3 Q4 See Figure 5 12 4n abnormal voltage IC2 does not operate Measure the voltage between pins Replace IC2 s output on the 4 and 7 of IC2 Approx 1 6 V 35 V line Measure the voltage between pins 35 v lo 12 and 7 of IC2 Approx 10 6 V Observe the voltage waveform be tween pins 5 and 7 of IC2 See Figure 5 13 Observ...

Page 232: ...e of 6pln o f 2 i A T l I 7op 5 1 T1 a l T1 1 r 7 r I Figure 5 9 Q2 Output Ql Input Voltage Waveforms 11 Base Emitter 1 lp Storage 11 T1 Emlttor 6pln o f 100 CN2 is discon f of Q 1 T1 m nected i 1 L d 1 Ii I Iv Figure 5 10 Q1 Input Output Voltage Waveforms B 1 100 20m Storage Y1 T1 T2 50 t 1 Figure 5 11 DB1 Output TYl Off On Voltage Waveforms 5 20 ...

Page 233: ...sition Condition Voltage Waveform 3 Q4 Gate Source 5 2 L Storage 3 Q4 Drain Source 100 1 1 1 Figure 5 12 Q3 Input Output Voltege Waveforms C2 5pin 7pin 2 5p Storage C2 11 pin lOpin 5 A T a p Figure 5 13 IC2 Oscillation Output Voltage Waveforms NOTE means location of the ROPSE board 5 21 ...

Page 234: ...0 ohms 5W 135 C 200 ohms IW 5 20 ohms IW 5 2 ohms l 2W 5 55V 50mA 150mW 400V 10A Table 5 10 ROPSE Board Main Parts List Location Classification Name ZD 1 Zenor Diode HZ2CLL TD Q1 Transistor 2SC3456 Q2 Q3 2SC2655 TPE6 Q6 2SA 10 15 TPE2 Q4 FET 2SK872 Q5 Ic L543 1 AA Icl NJM2903D IC2 TL594CN R1 1 Resistor MEG05N 10OKU 135 R13 ERQ 2CUJ 101 R14 ERQ 1 CUJ200 R2 1 R25 ERQ 12HUJ2R0 Pc 1 Photo Coupler TLP7...

Page 235: ...10A ST RAM APD43257C l 5L 14A Gate Array E05A1 OAA 2A E05A02LA 3B 4B E05A09BA 13A CPU HD64 180R1 P6 7B PPD7810HG ZD 1 Zenor Diode MA4043 L TA 4 03 4 26V 250mA 370mW D2 zD3 MA4300 H TA 3 0 2 3 1 8V 250mA 370mW ZD4 RD39JSB3 38 99 40 99V 5A 400mW ZD5 HZS39EB3 TD 36 0 37 85V 150mA 400mW ZD6 MA4033 L TA 3 12 3 28V 250mA 370mW Q1 Transistor 2SA 1020 TPE6 50V 2A 900mW Q2 Q4 Q6 Q 19 2SC 18 15Y TPE2 50V 15...

Page 236: ...onents use the printing test and also inspect visually Table 5 12 Electric Device List Classification Name Reference Table Motor HF Motor 2 2 PG Motor 2 7 CR Motor 2 10 CS Motor 2 15 PF Motor 2 18 Solenoid PT Solenoid 2 4 RL Solenoid 2 22 LD Solenoid 2 26 Sensor PT Sensor 2 5 PG Home Position Sensor 2 8 CR home Position Sensor 2 11 PW Sensor 2 12 PE Sensor 2 19 RL Sensor 2 23 LD Sensor 2 27 i 5 24...

Page 237: ... 2 Figure 6 2 LQ 2550 Lubrication and Adhesive Application Points Diagram 1 6 2 Figure 6 3 LQ 2550 Lubrication and Adhesive Application Points Diagram 2 6 3 Figure 6 4 LQ 2550 Lubrication and Adhesive Application Points Diagram 3 6 4 LIST OF TABLES Table 6 1 Lubricants and Adhesive 6 1 Table 6 2 Lubrication Points 6 1 Table 6 3 Adhesive Application Points 6 2 j ...

Page 238: ...he parts to be lubricated are clean before applying lubricant and avoid excessive application which may damage related parts Adhesive application is necessary at the point indicated in Table 6 3 when the part is disassembled or replaced EPSON recommends Neji Lock 2 G adhesive be applied to the point diagramed in Figure 6 3 Avoid overflow of excess to related parts Table 6 1 Lubricants and Adhesive...

Page 239: ...cting gear G 27 1 7 X Contact portion of paper feed roller and paper feed roller holder G 27 X Lubrication is necessary in the process of assembly Table 6 3 Adhesive Application Points Refer to Figures 6 1 and 6 2 i Ref No 21 22 23 Adhesive Application Points Screw for sensor of paper release solenoid assembly inside of right frame Screw for sensor of paper loading trigger assembly inside of right...

Page 240: ...REV A P r cl Figure 6 3 LQ 2550 Lubrication and Adhesive Application Points Diagram 2 6 3 ...

Page 241: ...REV A 7 i_ Figure 6 4 LQ 2550 Lubrication and Adhesive Application Points Diagram 3 6 4 ...

Page 242: ...A 6 27512 A 1 2 27256 A 1 3 HM65256BSP 15 wPD43257C 15L EO5A1OAA E05A02LA E05A09BA M5461OP STK6981 H SI 7304 H8D2148 STK66082E 7400 7405 74123 74175 74365 74373 75188 75189 TL431 A 1 2 ROPS ROPSE Board A 1 2 1TL594 A 1 2 2 NJM2903 A 2 CONNECTOR PIN ASSIGNMENTS A 3 D R A W I N G S LIST OF FIGURES Figure A 1 HD64180 Pin Diagram Figure A 2 HD64180 Block Diagram A i A 14 A 1 5 A 1 6 A 1 9 A 20 A 22 A ...

Page 243: ...OAA Block Diagram A 1 6 Figure A 20 E05A02LA Pin Diagram A 1 9 Figure A 21 E05A02LA Block Diagram A 1 9 Figure A 22 E05A09BA Pin Diagram A 20 Figure A 23 E05A09BA Block Diagram A 20 Figure A 24 M5461 OP Pin Diagram A 22 Figure A 25 M5461OP Internal Circuit A 22 Figure A 26 STK6981 H Pin Diagram A 24 Figure A 27 STK6981 H Internal Circuit A 24 Figure A 28 S1 7304 Pin Diagram A 26 Figure A 29 S1 730...

Page 244: ...m 2 A 59 Figure A 58 Model 5560 Push Tractor Unit Exploded Diagram A 59 Figure A 59 LQ 2550 Outline Drawing A 61 Table A 1 Table A 2 Table A 3 Table A 4 Table A 5 Table A 6 Table A 7 Table A 8 Table A 9 Table A 1 O Table A 1 1 Table A 1 2 Table A 1 3 Table A 1 4 Table A 1 5 Table A 1 6 Table A 1 7 LIST Primary ICs on OF TABLES the ROMA Board HD64180 Terminal Functions KPD781 OHG Terminal Functions...

Page 245: ...ments A 42 CN6 Pin Assignments A 43 CN7 Pin Assignments A 44 CN8 Pin Assignments A 44 CN9 Pin Assignments A 45 CN 10 Pin Assignments A 45 CN1 1 Pin Assignments A 46 CN 12 Pin Assignments A 46 CN 13 Pin Assignments A 46 CN 14 Pin Assignments A 46 CN15 Pin Assignments A 47 CN16 Pin Assignments A 47 CN17 Pin Assignments A 47 CN18 Pin Assignments A 47 CN19 Pin Assignments A 47 CN20 Pin Assignments A 4...

Page 246: ...C 15 ST RAM 32K X 8 Bit 150nS A 1 1 6 14A E05A 10AA Gate array Memory Management Unit A 1 1 7 2A E05A02LA Gate array Printhead Data Controi A 1 1 8 3B 4B E05A09BA Gate array Motor Control Unit A 1 1 9 1lB M546 10P LSI 8 Bit Parallel l F A 1 1 10 7D STK6981 H Hybrid IC PF Motor Driver A 1 1 11 7C SI 7304 Hybrid IC CR Motor Driver A 1 1 12 2C H8D2 148 Hybrid IC HF Motor Control and Driver A 1 1 13 1...

Page 247: ... transfer between memories including memory mapped 1 0 ASCI 2 channels Start stop asynchronous system full duplex SCI modem control signals CS 1 0 port 1 channel Serial to parallel conversion shift register 16 bit timer 2 channels Pulse output function Interrupts Internal 4 external 8 Bus I F 80 CPU line bus l F Dynamic RAM refresh controller Programmable refresh interval Low speed memory input ou...

Page 248: ...OUT Txs RXSICTSI CKS E E E II m ii CPU I DREQI DMACS TENDI 2 5 7 1 Asynchronous Scl H RXAO channel O tt RTSO MMU Asynchronous Scl L channel 1 V v Address I Data 1 TWV CKAI TENDo RXI w w AO A17 DO D7 Figure A 2 HD64180 Block Diagram A 3 ...

Page 249: ... 5 BUSACK o Pulled up 58 HALT o Pulled up 61 LIR o Pulled up 12 ST o Pulled up 57 REF o Refresh signal IC 1 4A REF pin 1 1 8 NMI I Pulled down 9 INTO I Pulled up 10 INT1 I Pulled up 11 INT2 I Interrupt 2 IC 1 1 B BSYF pin 37 47 DREQO I Data request signal IC 2A RDY pin 32 54 DREQ 1 I Pulled up 55 TEND 1 0 Pulled up 45 TXAO o Pulled up 46 RXAO I Pulled up 42 RTSO o SCI channel O RTS IC 7B PB2 pin 1...

Page 250: ...1 I Figure A 3 OP Code Fetch Timing b Memory Data Read Write Timing The memory data access timing is different from the OP code fetch timing in the following points The LIR signal does not go active Read data is valid a half clock later as comparing with the OP code fetch timing The data is fetched at the trailing clock of state T3 For memory data write timing the ME signal and WR signal are activ...

Page 251: ...g detection Standby function Built in clock oscillator circuit N M O S Figures A 5 and A 6 show the pin diagram and the internal block diagram Table A 3 shows the functions of each terminal PAO PA1 PA2 PA3 PA4 PA5 PA6 PA7 PBO PSI PB2 PB3 P84 0s PB6 PB7 TXD RXD Pc2 Zi i PC3 PC4 TO PCS Pc6 coD PC7 ml I N T 1 MODE1 R E S E T MOOEO x2 xl Vss 6 3 3 6 2 61 60 6 5 9 7 5 8 8 57 9 10 z 11 54 12 53 13 52 14...

Page 252: ...REV A I 1 I 7 v m o m x b Figure A 6 PPD781OHG Block Diagram A 7 ...

Page 253: ... Control panel 10 PB 1 0 CKO Serial data synchronous Control panel clock 14 PB5 o LOAD Serial data trigger pulse Control panel 13 PB4 o LCDCE LCD controller chip enable Control panel signal 2 0 INT2 I OLSW ON LINE switch signal Control panel 11 PB2 I SINH CS 1 0 handshaking IC 1 3A RTSO pin 42 12 PB3 o MINH CS 1 0 handshaking IC 1 3A CTSO pin 43 15 PB6 o FNEN HF motor enable signal IC 2C pin 2 17 ...

Page 254: ...FF Control panel PLATEN GAP ADJUST and PITCH switches signal 41 AN7 I LOAD EJECT LINE FEED Control panel I FORM FEED switches signal 4 3 AVCC I Analog port power supply 5 VDC 42 V AREF o Analog port reference voltage 33 AVSS Analog port ground 47 PFO o Upper address A8 to Al 5 J J bus 54 PF7 55 PDO 1 0 Lower address AO to A7 J data AO to A7 bus 62 PD7 Selected by the ALE signal 46 ALE o Address la...

Page 255: ...iplex mode the address is latched at the ALE signal during state T1 and the drivers for AD7 to O are disabled Then the signal is output from T1 to T3 to enable the memory to be addressed fetching at T3 and internal processing at T4 CLOCK ALE AB15 8 PF7 O AD7 o PD7 O m f Y ADDRESS x A D D R E S S OP CODE c Figure A 7 OP Code Fetch Timing Memory Read Timing The memory read timing consists of three s...

Page 256: ...ite data is output on AD7 to O from the beginning of T2 to the end of T3 The WR signal is output from the middle of T1 to the beginning of T3 CLOCK L AB15 8 PF7 O x ADDRESS x AD7 o PD7 O x ADDRESS x x WRITE DATA x iii i I NOTE Figure A 9 Memory Write Timing When PD7 to O and PF7 to O are output to the mautiplexed address data bus AD7 to O and address bus AB 15 to 7 both the and WR signals during t...

Page 257: ...19 al 00 11 18 Oe 01 12 17 0s 01 13 16 04 CmD 1 4 15 03 V Power supply 5 V Figure A 10 27512 Pin GND Ground Vw GND Vet 00 0 02 0s 04 0s 06 01 T 7 z BEE t me Circuit Output Buffer I I v AO w 6 A Column Decoder Column Gate AZ w AS w I I A4 As Ab AI i Addres Aa Buffer As A o AI 10 3 Row 1024 Decoder e Figure A 1 1 27512 Block Diagram Table A 4 27512 Signal Status Diagram Vcc OE VPP CE 0 0 0 7 Mode 28...

Page 258: ...00 11 16 DG P D 4 12 17 05 D 2 13 16 D4 G NO M 13 03 Figure A 12 27256 Pin Diagram Doto out put o 00 D7 A o 1 I I I t 1 i 1 zX Output Enoble E Output Buffer Chip Enable E Y Decode I Y Select Address Input I AO A 4 I Memory X Decode Ce II I Mat rix 262144 bit I Figure A 1 3 27256 Block Diagram Table A 5 27256 Signal Status Mode CE OE A9 VPP Vcc outputs Read L L x Vcc Vcc D out Output Disable L H x ...

Page 259: ...ower supply 5 V At4 A12 A7 AC As A4 Al A2 AI AO 1 0 0 1 01 1 0 2 Gt40 4 ZJ ZJ ZJ 2 2 21 ZJ 10 19 10 12 17 13 16 14 15 Vcc m A13 A8 A 9 AI R AIO E 1 07 1 06 1 0s 1 0 4 1 0 1 Figure A 14 HM65256BSP 15 Pin Diagram GND Ground A Address Row Memory Matrix TLOICh D cnd r 256112e11e COntrO1 I Vck 1 1 i 1 07 Cm ml I Colullm Du0d2f 1 4 g I 0 1 I 5E 0 Rwd wriwcontml WE 0 1 Figure A 1 5 HM65256BSP 15 Block Di...

Page 260: ...hip enable 2 input 1 01 to 1 08 Data output A14 WC AIX WE AT Am A4 A4 As A4 A4 Ail A CE4 A l AOO A t m Ao 1 00 1 01 1 07 I I o I a 1 0s GM 1 04 Vcc Power supply 5 V Figure A 1 6 IAPD43257C 15L Pin Diagram GND Ground A s A A7 As Ss Row Memory cell ArroY AD B ew 08coder 262 144 ens AII 5i2 X 512 AIr AIs A14 1 1 1 01 1 04 lmrl sense switch Op4J c o n t r o l Colwrm Oecoder Control I I Ad em Suffer L ...

Page 261: ...T 2 28 37 PORT 1 29 36 TO 30 35 31 34 GND 32 33 Vcc Pi E AB8 081 MO ABO AB2 E To BANKO ABI DB2 AB7 CAR2 A 6 BANKi O 1306 AB13 ABi2 AB9 D83 084 DB5 007 KC Figure A 1 8 E05A1 OAA Pin Diagram GND VDO i 5V 4 AB 15 8 RE F DB 7 o C A R I CAR2 TH L D 0 1 Sc M L T c Pu LOWER FRE H AOORESS c AOORESS DATA 9 P 1 32 OUNTE A 8 15 0 MAN AGEMENT Da 7 0 18 BIT m MMIOA EXTERNAL Cssoo MEMORY c S640 MANAGEMENT CSBCO...

Page 262: ...dress bus 13 8 AB 14 I Address bus 14 7 AB 15 I Address bus 15 59 AB 16 I Address bus 16 28 AB 17 I Address bus 17 29 AB 18 I Address bus 18 56 1 0 Data bus O 57 D1 1 0 Data bus 1 49 D2 1 0 Data bus 2 37 D3 1 0 Data bus 3 D4 1 0 Data bus 4 D5 1 0 Data bus 5 D6 1 0 Data bus 6 D7 1 0 Data bus 7 POTO o Port 1 IC 1 1 B PSW pin 20 1 POT I o Port 2 IC 1 1 B BSSL pin 3 4 0 Memory mapped 1 0 O IC 1 1 B CS...

Page 263: ... o External ROM select CN4 SLOT A PROG pin 26 2 B80 o Bank select CN6 KANJI pin 39 4 BANK o Bank select CN6 BANK pin 19 31 m I 8 bit parallel l F data input flag IC 1 1 B BSYF pin 37 33 Vcc I 5 VDC 64 1 32 Vss Ground 23 THLD I Power on reset 21 ROUT o RESET signal 22 DISC o Discharge 6 MLT I Pulled down 63 CPU I Power on reset lNIT reset 61 CAR 1 I Cartridge MOUNT DISMOUNT CN4 SLOT A pin 8 signal ...

Page 264: ...a Latch I Block 3 Figure A 21 E05A02LA Block Diagram Tahl A Q Ff 5Af371 A Terminal Fllnctinrm H9 H16 H17 J H24 WW v Pin No Ter minal 1 0 Description 1 HI 0 Printhead solenoids 1 to 8 ON OFF 8 H8 13 H9 o Printhead solenoids 9 to 16 ON OFF J 20 H16 34 H17 o Printhead solenoids 17 to 24 ON OFF J J 41 H24 22 DO I Print data command 29 D7 11 AO I Address bit O 12 CE I Chip enable 10 WR I Write strobe 3...

Page 265: ... MOTOR I MOTOR m PHASE REFERENCE PLMES HA LSES GATE P U L S E E GENERATOR IN VERTER CONTROLLER i i t I AO I 00 I co I DO I T ire Yin Oe 3 0 2 MOTOR 2 MOTOR 2 PNASE REFER ENCE PuLSES GENERATOR GATE OA PULSE E CONTROLLER R 03 m AO 2 Bo 2 C02 DO 2 L 0 0 0 I 0 2 0 3 0 4 O S 0 6 0 7 0 8 0 9 O t b b J 4 4 4 0 9 II MoDE S E L EC TOR 0 4 ADDRESS OECOO E R 05 I b b i i 4 6 t 1 n A M P o r 0 6 J I 2 f POT O...

Page 266: ...POT1 o CR motor reference voltage PG motor HOLD DRIVE 1 OFF ON Speed 4 1 POT2 o CR motor reference voltage Pulled up 2 OFF Speed 2 3 17 POT3 o IC 7D E pin 18 CS motor HOLD DRIVE 7 AO 1 0 CR motor coil A PG motor coil A 6 601 0 CR motor coil B PG motor coil B 3 Col o CR motor coil C PG motor coil C 2 DO 1 0 CR motor coil D PG motor coil D 13 A02 o PF motor coil A CS motor coil A 14 602 0 PF motor c...

Page 267: ...5 imz 3 4 0 803 m 4 3 9 RQY m 5 38 B GND 6 3 7 B S YF B04 7 3 6 EB SY 80 I 8 3 5 GND au SY 9 3 4 B S S L m 10 3 3 ACK I 01 N 8 II 32 c 01 N 7 12 3 m DI N 6 13 3 0 m DI N 5 14 2 9 DOU8 D N 4 15 28 DOU7 DIN 3 16 27 DOU 6 01 N 2 17 26 DOU5 01 N I 18 25 DOU4 m 19 24 DO U3 m 2 0 23 DOU2 GND 21 22 00 u I Figure A 24 M5461 OP Pin Diagram h I d T s 1 ...

Page 268: ...on O When ACKI changes from LOW to HIGH BUSY changes HIGH toLOW 1 When CS WR changes from HIGH to LOW BUSY changes HIGH to LOW 3 0 RD CPU Read strobe 31 WR CPU Write strobe 3 2 Cs MMU Chip select signal MMIOO pin 19 33 ACKI CPU Data bit 2 36 EBUSY CPU Data bit 3 37 BSYF CPU BUSY flag 38 RDY PANEL LED Ready signal 1 BI 1 CPU Data bit O 8 BO 1 HOST PE signal 3 B12 HOST i RXD signal 2 B02 CPU i RXD s...

Page 269: ...r type driver IC and includes a control drive circuit t for a 4 phase stepper motor 2 Q RI 01 TR4 5 y 1234 la Figure A 26 STK6981 H Pin 345 6 7 8 9 Q3 L TR5 1 ZI Diagram 12 13 14 15 16 010 D8 D12 011 TR8 TR7 17 I LiJl Oe TR6 1 I R15 Figure A 27 STK6981 H Internal Circuit A A 24 ...

Page 270: ...F motor coil D drive pulse 4 AOUT o PF motor coil A drive terminal 13 BOUT o PF motor coil B drive terminal 6 COUT o PF motor coil C drive terminal 15 DOUT o PF motor coil D drive terminal 3 ZD o PF motor surge voltage output terminal 18 E o HOLD DRIVE switch 8 RAC I Coil A C current detection resistor mounting terminal 12 RBD I Coil B D current detection resistor mounting terminal 9 VRAC I Consta...

Page 271: ...t current chopper type driver IC and includes a control drive circuit for a 4 phase stepper motor g o b I 1 2 1 9 2 0 Figure A 28 S1 7304 Pin Diagram 6 8 6 5 7 4 3 2 1 t ill Ce Trigger Pulse Oscillot ion R4 Circuit i 3 K Figure A 29 S1 7304 Internal Circuit A 26 ...

Page 272: ...otor coil D drive pulse 5 AOUT o CR motor coil A drive terminal 9 BOUT o CR motor coil B drive terminal 7 COUT o CR motor coil C drive terminal 11 DOUT o CR motor coil D drive terminal 8 ZD o CR motor surge voltage output terminal 17 E o HOLD DRIVE switch 2 RAC I Coil A C current detection resistor mounting terminal 14 RBD I Coil B D current detection resistor mounting terminal 20 RX I Constant cu...

Page 273: ...R 1 DT VF Q 78 C 3 R 12 C9 14 R 13 R 1S Figure A 31 H8D2148 internal Circuit Table A 1 4 H8D2148 Terminal Functions r IC2 B b FOUT TOUT Pin No Terminal 1 0 Description Primary Destinations 12 A o HF motor coil A drive terminal 13 B o HF motor coil B drive terminal 2 ENB I Enable IC 7B PB6 pin 15 4 TH o HF motor temperature detection thermistor 8 VF I External resistor terminal for constant selecti...

Page 274: ...111111111111 11111111111111 1 3 5 7 9 11 13 15 17 1921 2325272931 3335373941 2 4 8 8 10 12 14 16 18202224262830323436 3840 a Front View 0 0 0 0 0 0 c 1 o Q 4 2 4 4 4 6 4 8 5 0 5 2 5 4 5 8 5 8 6 0 6 2 8 4 6 6 6 8 7 0 7 2 7 4 7 6 7 8 8 0 8 2 4 3 4 5 4 7 4 9 5 1 5 3 5S 5 7 5 9 8 1 6 3 8 5 8 7 8 9 7 1 7 3 7 5 7 7 7 9 8 1 id 7 o v 8 White Line b Reor View c Left Side View Figure A 32 STK66082E Pin Diag...

Page 275: ...2 4 0 7 38 0 30 0 B i o I 4 a 1731 3 1441 4 t s 1 412 1s31 0 a Ut 4 Jalsll 4 1ss1 4 s78 m 1s08 a 8 s 4 7 1498 1 PI 4 468 4 a 8438 4 0 tul 70 as s114 64 2 IUo as 6 7 M 28 6 2 1911 10 1901 4U 0 s3 1 4s 4 s 46 s s0 0 1 I i I 1 I 1 ...

Page 276: ...ve 2 4 111 2 2 H1 1 8 51 112 4 9 H12 16 3 4 P4 Common line for printhead solenoids 4 8 and 16 6 7 113 5 9 H13 Printhead solenoid 2 drive 6 6 114 61 H14 7 69 115 5 7 H15 15 7 6 P5 Common line for printhead solenoids 2 7 and 15 12 116 4 H16 Printhead solenoid 3 drive 11 117 6 H17 11 14 118 2 H18 19 78 P6 Common line for printhead solenoids 3 11 and 19 13 119 1 H19 Printhead solenoid 14 cjrive 64 120...

Page 277: ...n No Terminal 39 PNP 1 35 VDC input ON OFF 41 PNP2 80 PNP3 82 PNP4 29 NU 1 Printhead drive Tr X 24 70 NU2 base pulled up by Vx 40 Pu 1 35 VDC switching Tr x 4 81 PU2 base pulled up by Vx 3 0 TS 1 Not used open 3 8 TS2 71 TS3 7 9 TS4 3 D1 Surge voltage feedback terminal 17 D2 35 V line 44 D3 58 D4 x L ...

Page 278: ...OUTPUT D P IWUT f32 5 C U T P U T B 6 GND 7 10 I N P U T C 9 I N P U T C2 8 OUTPUT C Figure A 40 75188 Pin Diagram A 1 1 CC 6A 6Y 5A 5V 4A 4Y Figure A 35 7405 Pin Diagram 18 74175 v 40 4 40 3D 36 30 cl m 16 I L J I I I Cima 10 16 10 20 26 0 GUI Figure A 37 74175 Pin Diagram A 1 1 20 74373 EM LE V 80 80 70 70 60 00 50 50 Figure A 39 74373 Pin Diagram A 1 1 22 75189 INPUT A Vcc INPUT D OUTPUT A RESP...

Page 279: ...sistors The TL43 1 has high stability and outputs a large current so that it can replace various Zener diodes Features Temperature compensated feedback voltage 50 PPM C TYP Low Zener current 400 WA TYP High response speed Low dynamic output impedance Low noise ar L CATHODE P ANODE I J l L REF m K 1 8 REF NC 2 7 NC NC 3 6 A c4_ bNc Figure A 42 TL431 Pin Diagram f A 34 ...

Page 280: ... on the ROPS ROPSE board Table A 1 6 Primary ICS on the ROPS ROPSE Board Location Name of IC Type Description Reference Section Q4 L5431 AA Ic Low power type TL431 A 1 1 23 IC2 TL594CN Ic Switching Regulator A 1 2 1 Ic 1 NJ M2903D Ic Dual Comparators A 1 2 2 A 35 ...

Page 281: ...A 44 TL594 Block Diagram Table A 1 7 TL594 Terminal Functions in No Terminal 1 0 Description 1 NON INV I side of ERROR AMP1 2 INV I side of ERROR AMP 1 16 NON INV I side of ERROR AMP 2 15 INV I side of ERROR AMP 2 3 FEED BACK I Feed back 4 DEADTIME I Dead time control 13 OUTPUT CONTROL I Output control 5 CT I External condenser terminal for the sawtooth waveform oscillator 6 RT I External resistor...

Page 282: ... features are as follows Single power supply Open collector output Voltage range 2 to 36 V OuTp TAm 3P v INVERTING 4 I I L INPuT A NON INVERTING INPUT A m z 7 OUTPUT B A B 3 I N V E R T I N G INPuT B GND Figure J1 N ON 1 NVERTI N G INPuT B A 45 NJ M2903 Pin Diagram A 37 ...

Page 283: ...ewed from the ROMA board CARRIAGE HOME POSITION SENSOR PAPER THICKNESS SOLENOID SENSOR z PAPER END o 0 SENSOR m 1 PAPER WIDTH m SENSOR u COLOR SELECT Cn MOTOR o HEAD FAN MOTOR w m PRINTHEAD z THERMISTOR m PLATEN GAP z MOTOR PLATEN GAP rTIHOfUE POSITION SENSOf o LOADING SOLENOID SENSOR z SOLE A NSOR x CARRIAGE MOTOR PAPERFEED MOTOR 4 I I 2 IA L 12 r 2 a summary 8 Figure A 46 Cable Connections A 38 ...

Page 284: ...7 CN 12 5 PT solenoid and PT sensor A 28 CN 13 3 CR home position sensor A 29 CN 14 2 Fan unit A 30 CN 15 2 PE sensor A 3 1 CN 16 9 PG motor and PG home A 32 position sensor CN 17 6 CR motor A 33 CN 18 6 PF motor A 34 CN 19 4 LD solenoid and LD sensor A 35 CN20 4 RL solenoid A 36 and RL sensor CN21 3 Case open sensor 8C2 A 37 CN22 12 ROPS ROPSPE 5V 12V GND 35 V GH 8Bz A 38 IOPES CN 1 4 External AC...

Page 285: ... STROBE I Strobe pulse 11 D7 RXD I Data bit 7 Serial signal input 12 GND Signal GND 13 RESET o Reset 14 1 2 o 12V DC 15 D2 B2 I Data bit 2 Bit rate select 16 5 o 5V DC 17 D1 Bl I Data bit 1 Bit rate select 18 NC Not connected 19 DO 8 7 I Data bit O 8 bit 7 bit select 20 1 2 o 12V DC 21 P s I Parallel Serial select 22 23 SLCT IN I Select in 24 GND Signal GND 25 TXD o Transit data 2 6 GND Signal GND...

Page 286: ...ess bus 8 12 D2 1 0 Data bus 2 13 D1 1 0 Data bus 1 14 RD o Read strobe 15 DO 1 0 Data bus O 16 AO o Address bus O 17 D3 1 0 Data bus 3 18 CG o CG select 19 D6 1 0 Data bus 6 20 A14 o Address bus 14 21 A4 o Address bus 4 22 WR o Write strobe 23 A7 o Address bus 7 24 5 o 5V DC 2 5 Al 1 0 Address bus 11 26 PROG I Program select 27 Al 2 0 Address bus 12 28 A13 o Address bus 13 29 A l o Address bus 1 ...

Page 287: ...bus8 12 D2 1 0 Data bus 2 13 D1 1 0 Data bus 1 14 RD o Read strobe 15 DO 1 0 Data bus O 16 AO O I Address bus O 17 D3 1 0 Data bus 3 18 CG o CG select 19 D6 1 0 Data bus 6 20 A14 o Address bus 14 21 I A4 O lAddressbus4 22 WR o Write strobe 23 A7 o Address bus 7 24 I 5 I O I 5V DC 25 Al 1 0 Address bus 11 26 PROG I Pulled up 5V 27 Al 2 0 Address bus 12 28 Al 3 0 Address bus 13 29 I Al I O I Address...

Page 288: ...0 Data bus 2 12 5 o 5V DC 13 I GND I I GND I 14 BO o Not used 15 Al 7 Not Connected 16 A14 o Bank O 17 A16 o Bank 2 18 I I O I Pulled up 5V DC I 19 BANK o Kanji C G ROM CE Signal 20 MMIO o select 21 I I O I Read pulse I 22 I NC I I Notconnected I 23 I I O I Not connected I 24 A8 o Address bus 8 25 A9 o Address bus 9 26 I All I O I Address bus 11 I 27 A3 o Address bus 3 28 A2 o Address bus 2 29 D7 ...

Page 289: ...3 OLSW I SW1 OFF 4 AN5 1 Read status of SW5 SW6 SW8 and SW1 O 6 AN6 I Read status of SW7 SW9 SW1 1 and SW12 15 AN7 I Read status of SW2 SW3 and SW4 12 AO o LCD control driver IC address bit O 8 DO o LCD control driver IC data bit O 7 D1 o LCD control driver IC data bit 1 10 D2 o LCD control driver IC data bit 2 9 D3 o LCD control driver IC data bit 3 5 WR o LCD control driver IC write strobe 11 LC...

Page 290: ...line for coils A and B 35 VDC 17 FTH I HF motor thermistor 18 GND Ground Table A 26 CN1 O Pin Assignments Pin No Signal 1 0 Description 1 H2 o Printhead solenoid 2 4 H7 o Printhead solenoid 7 7 H15 o Printhead solenoid 15 2 C5 o Common line 35 VDC 18 m o Printhead solenoid 3 17 HI 1 0 Printhead solenoid 1 1 16 H19 o Printhead solenoid 19 3 C6 o Common line 35 VDC 14 H14 o Printhead solenoid 14 8 H...

Page 291: ...n line 35 VDC 15 m o Printhead solenoid 4 11 H 8 o Printhead solenoid 8 13 H16 o Printhead solenoid 16 7 C4 o Common line 35 VDC 14 TMSN I Printhead thermistor 12 AGN Analog ground Table A 28 CN12 Pin Assignments Pin No Signal 1 0 Description 1 PGPL o PT solenoid ON OFF 2 3 5 o 35 VDC 3 12 0 1 2 VDC 4 PGSN I Paper thickness signal 5 AGN Analog ground Table A 29 CN13 Pin Assignments Pin No Signal 1...

Page 292: ... CRAC o Common line for CR motor coils A and C 35 VDC 6 CRBD o Common line for CR motor coils B and C 35 VDC 1 CRA o CR motor coil A 2 CRC o CR motor coil C 3 CRB o CR motor coil B 4 CRD o CR motor coil D Table A 34 CN18 Pin Assignments Pin No Signal 1 0 Description 5 PFAC o Common line for PF motor coils A and C 35 VDC 6 PFBD o Common line for PF motor coils B and C 35 VDC 1 PFA o PF motor coil A...

Page 293: ...nts Pin No Signal 1 0 1 5 o 5 VDC 2 OPEN I escripL Printer cover OPEN CLOSE signal 3 GND Ground Table A 38 CN22 Pin Assignments Pin No I Signal I 1 0 I Description 1 2 3 4 5 6 5 I 1 2 i 1 2 I GND 5 VDC 12 VDC 12 VDC Ground for control circuits 7 9 3 5 I 3 5 VDC 1 0 1 2 GH Ground for drive circuits Table A 39 CN1 Pin Assignments Pin No Signal 1 0 Description 1 N i External AC plug connector 2 L I A...

Page 294: ...REV A I A 3 D r a w i n g s UNIT Y4S620200000 FI 6 3A 2SV rJl 1 T T 1 T I n b 0 e l ml Component Layout A 49 ...

Page 295: ...b PROTECTION N AGAINST RISK OF FIRE REPLACE ONLY WITH SAME TYPE ANO RATINGS I Ill w 0 0 0 v I I C27 k R38 R2 It u z R39 R30 u 40 n T L 594 6 R4 hG N n 9 I la m XI I f 111 LJ n u ye KG Figure A 48 ROPSE Board Component Layout A 50 ...

Page 296: ...REV A A h 0s am 1 I I I I 1 I I 1 1 It m I I r u n 1 1 5 Q Lo O 6xm Figure A 49 ROPS Board A 5 1 Circuit Diagram ...

Page 297: ...REV A 1 L I Irl N I i t 1 I I x Figure A 50 ROPSE Board Circuit Diagram A 52 ...

Page 298: ...REV A g c N 45620 00000 rru l_ 0 3 5 6600 1 i I I I L C U q CN4 z 9 r l L i E 7 Figure A 51 ROMA Board Component Layout A 53 ...

Page 299: ... PITCH SVV8 CONDENSED SW9 TEAR OFF Swl o MICRO FEED Swl 1 PLATEN GAP ADJUST Swl 2 SelecType Table A 41 ROPNL Board LED Layout Switch Name LED 1 POWER LED2 READY LED3 ON LINE LED4 TRACTOR LED5 FRICTION LED6 CSF LED7 CONDENSED LED8 PAPER OUT LED9 TEAR OFF LED 10 MICRO FEED LED1 1 PLATEN GAP ADJUST LED 12 SelecType LED 13 a LED 14 A LED 15 v LED 16 D LED 17 LCD backup light J LED26 A 55 ...

Page 300: ...REV A 0 z J r In 0 m P t 2 3 F t 2 Q 1 J t SED1200FOA L3Kx3 a g t 0 0 0 m 1 r I MSM5937 IRS Figure A 54 ROPNL Board Circuit Diagram A 56 ...

Page 301: ...Figure A 57 Model 5560 Exploded Diagram 2 2 Figure A 58 Model 5560 Push Tractor Unit Exploded Diagram REV A A 59 ...

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Epson LQ-2550, Technical Manual

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