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PRINCIPLES OF OPERATION

REV.-A

2.3.4.5 Carriage Motor Drive Circuit

This unit utilizes an SLA7020M IC for the stepper motor drive. This IC causes the motor to be driven at the
specified current. The current value is determined by the value of the external voltage input. Within the IC,
the AB (AA) phase and the CD (BB) phase are completely differentiated and create identical circuits. For

convenience, only the AB (AA) circuit is explained below. Figure 2-45 shows the carriage motor drive
circuit. Figure 2-46 shows the SLA7020M circuit diagram.

Figure 2-45. Carriage Motor Drive Circuit

2-38

LQ-510

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Summary of Contents for AP-4000

Page 1: ...LQ 510 AP 4000 T E C H N I C A L M A N U A L EPSON ...

Page 2: ...ceiver are on different branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commis sion helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington D C ...

Page 3: ...T THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED USE EXTREME CAUTION IN WORK ING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS WARNING 1 Repairs on Epson products should be performed on y by an Epson certified repair technician 2 Make certain that the source voltage is the same as the rated voltage listed on the serial number rating plate If th...

Page 4: ...REV A REVISION SHEET iv LQ 510 ...

Page 5: ...d interfaces For Canadian Users This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Department of Communications Le p sent appareil num ique n emet pas de bruits radio ctxiques dbpassant les limites applicable6 aux appareils numeriques de Classe B prescrites dans le reglement sur...

Page 6: ...the information contained herein is equally applicable to both printers Below is a list of unique parts for the Epson ActionPrinter 4000 Part Number Description Logo plate Individual carton box Pad sleeve ActionPrinter 4000 parts not listed above are identical to those for the LQ 510 ...

Page 7: ... CONTENTS CHAPTER 1 CHAPTER 2 CHAPTER 3 CHAPTER 4 CHAPTER 5 CHAPTER 6 APPENDIX GENERAL DESCRIPTION PRINCIPLES OF OPERATION OPTIONAL EQUIPMENT DISASSEMBLY ASSEMBLY AND ADJUSTMENT TROUBLESHOOTING MAINTENANCE LQ 510 vi ...

Page 8: ...EET LOADING AND SHEET EJECTION 1 18 TEAR OFF FUNCTION 1 18 OPERATING INSTRUCTIONS 1 19 1 8 1 Self Test 1 19 1 8 2 Hexadecimal Dump Function 1 20 1 8 3 Bit Image Printing 1 21 1 8 4 Error Conditions 1 22 1 8 5 Buzzer Operation 1 22 1 8 6 Printer Initialization 1 22 1 8 7 Default Values 1 23 1 8 8 Adjust Lever Operation 1 23 1 8 9 Printer Protection for Heavy Duty Printing 1 24 MAIN COMPONENTS 1 25 ...

Page 9: ...gure 1 15 Model 5710 Printer Mechanism 1 28 Figure 1 16 Housing 1 29 Table 1 1 Interface Options 1 1 Table 1 2 Optional Units 1 1 Table 1 3 Cut Sheet Specifications 1 4 Table 1 4 Continuous Paper Specifications 1 4 Table 1 5 Envelope Specifications 1 5 Table 1 6 Label Specifications 1 5 Table 1 7 Printing Mode 1 10 Table 1 8 Character Matrix and Character Size 1 11 Table 1 9 Data Transmission Timi...

Page 10: ...ts 8 Control panel switch selection of Draft Roman Sans Serif or slot mounted optional multi font module font 9 Control panel switch selection of normal or condensed printing 10 Optional cut sheet feeder CSF for easy handling of cut sheets The LQ 510 is equipped with the standard Epson 8 bit parallel interface Various interface options allow prin ting from a wide variety of computers Table l l lis...

Page 11: ...GENERAL DESCRIPTION REV A Printer Cover A Printer Cover B Figure l l Exterior Views of the LQ 510 1 2 LQ 510 ...

Page 12: ...the following points regarding paper handling Friction Feed 1 Do not use continuous paper 2 Do not use a single sheet shorter than 7 28 inches 182 mm or longer than 10 28 inches 257 mm 3 Do not perform a reverse paper feed when the paper is within 34 inch 8 5 mm from the top or within 88 inch 22 mm from the bottom 4 Do not perform a reverse feed greater than 1 6 inch after the paper end has been d...

Page 13: ...ons 1 6 inch or programmable in units of 1 360 inch From rear Friction without CSF 100 ms line at 1 6 inch line feed 2 2 inches per second continuous feed Friction with CSF 100 ms line at 1 6 inch line feed 2 2 inches per second continuous feed Tractor 100 ms line at 1 6 inch line feed 2 2 inches per second continuous feed See Tables 1 3 through 1 6 Table 1 3 Cut Sheet Specifications Width Length ...

Page 14: ...kness Table 1 6 Label Specifications Greater than 2 x 15 16 inches 63 5 x 23 8 mm 0 0063 to 0 0075 inch 0 16 to 0 19 mm Thickness of the base paper must be 0 0028 to 0 0031 inch 0 07 to 0 09 mm NOTES 1 Printing on labels is available only at normal temperatures 2 Labels must be fanfold 3 For printing on labels with pressure sensitive paper the following conditions must be met 1 sheets of labels mu...

Page 15: ... Figure 1 4 Printable Area for Cut Sheets At least 0 12 inch 3 mm when paper width is less than 9 inches 229 mm at least 9 inch 24 mm when the paper width is 10 1 inches 257 mm Printing is possible approximately 1 12 inches 28 mm from the paper s detected bottom edge the 53 inch 13 5 mm value lowest print position is for reference only Paper feed accuracy cannot be assured within 0 87 inch 22 mm o...

Page 16: ... 0 0 0 0 0 0 0 0 0 0 ABC XYZ 0 0 0 0 0 0 0 0 0 t 0 0 0 0 0 0 0 0 0 Figure 1 5 Printable Area for Continuous Paper NOTES 1 52 inch 13 mm or greater for paper widths of 4 to 9 5 inches 101 to 242 mm 1 04 inches 26 mm or greater for paper widths of 10 inches 254 mm 2 52 inch 13 mm or greater for paper widths of 4 to 9 5 inches 101 to 242 mm 96 inch 24 mm or greater for paper widths of 10 inches 254 m...

Page 17: ...mm Mean Cycles Between Failures MCBF 3 million lines excluding printhead Mean Time Before Failure MTBF 4000 Power On Hours 25 duty 200 million strokes wire UL478 U S version CSA22 2 154 VDE0806 TUV European version FCC class B U S version VDE0871 self certification European version 108 VAC to 132 VAC 120 V version 198 VAC to 264 VAC 220 240 V version 49 5 to 60 5 Hz 1 8 A AC 120 V version 1 A AC 2...

Page 18: ...r ASCII and 15 international character sets Epson Roman Family number 0 Epson Sans Serif Family number 1 Epson Roman 10 Epson Roman 12 Epson Roman 15 Epson Roman Proportional Epson Sans Serif 10 Epson Sans Serif 12 Epson Sans Serif 15 Epson Sans Serif Proportional Epson Draft 10 Epson Draft 12 Epson Draft 15 Selection and mixing of the following modes are allowed except that 15 cpi Condensed Mode ...

Page 19: ...onal super subscript NOTES 1 The maximum value applies when only characters of maximum width are printed 2 The minimum value applies when only characters of minimum width are printed 3 indicates that the LQ character set is automatically selected when proportional pitch is specified 1 10 LQ 510 ...

Page 20: ...proportional condensed LQ proportional super 28 x 16 maximum 360 1 8 x 2 3 subscript 12 x 16 minimum 360 0 7 x 2 3 LQ proportional super 360 subscript condensed 360 Unit ESC sp 120 120 120 240 360 180 180 360 360 180 180 360 360 NOTES 1 HDD is horizontal dot density in dots per inch 2 Face matrix and character size indicate maximum character size This value changes accord ing to differences in pap...

Page 21: ...20 21 22 23 24 1 12 LQ 510 L E F T S P A C E R I G H T S P A C E 1 4 i 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 L E F T S P A C E 30 Ascender area Descender area R I G H T S P A C E a2 1 1 Face width a1 d 29 dots Normal LQ excluding 15 pitch l 15 dots 15 pitch and condensed LQ Character width CW 36 dots 10 pitch 360 DPI 30 dots 12 pitch 360 DPI 24 dots 15 pitch 360 DPI 21 dots condensed 10 p...

Page 22: ...parallel interface Table 1 9 Connector Pin Assignments and Signal Functions Pin No Signal Name Return Pin No Dir Functional Description 1 STROBE 19 In Strobe pulse to read the input data Pulse width must be more than 0 5 ps Input data is latched at the fall ing edge of this signal 2 DATA 1 20 In Parallel input data to the printer 3 DATA 2 21 In HIGH level means data 1 4 DATA 3 22 In LOW level mean...

Page 23: ...ive LOW input for 1 printer initialization ERROR out LOW indicates an error occurred in the printer GND Ground for twisted pair grounding SLCT IN out In Not used Always HIGH Pulled up to 5 V through 3 3K ohm register If LOW when printer is initialized DC1 DC3 control is disabled Dir refers to the signal flow direction as viewed from the printer Return denotes a twisted pair return line The cable u...

Page 24: ...ormal process NOTES 1 In Table 1 10 it is assumed that no ERROR status exists other than that attributable to OFF LINE mode 2 Once the printer has been put in the deselected state by the DC3 code the printer will not revert to the selected state unless the DC1 code is input again In the deselected state the printer ignores input data until the DC1 code is received 3 The DC1 and DC3 codes are enabl...

Page 25: ...ctions and jumper setting for the LQ 510 printer 1 4 1 DIP SWITCH SETTINGS The two DIP switches for the printer are located on the control panel and function as shown in Tables 1 11 through 1 15 Note that the status of the DIP switches is read only at power up or upon receipt of the INIT signal 1 16 LQ 510 ...

Page 26: ... is ignored 1 5 SELECTYPE FUNCTION SelecType enables easy selection of fonts and printing modes and can be used to select any of the fonts listed on the control panel for either condensed or normal printing If the printer uses an optional slot mounted multi font ROM cartridge these fonts also can be selected from the control panel SelecType functions only when the printer is not printing at which ...

Page 27: ...as the loading positions for subsequent forms Adjustment is made using the FORM FEED button which will increment the paper forward and the LINE FEED switch which will increment the paper in reverse The minimum feed amount is 1 80 inch When the cut sheet feeder is used the adjusted position for the top of form will be lost after the printer is reinitialized and the top of form will be reset to the ...

Page 28: ... switch settings are printed xxxxx Country USA France Germany U K Denmark Sweden Italy Spain Font Roman Sans serif slot Draft Invalid Valid CG table Italic Graphic CSF mode Invalid Valid SW1 1 1 2 1 3 on on on on on off on off on on off off off on on off on off off off on off off off SW1 4 1 5 off off on off off on on on SW1 6 o f f 3 7 o f f on SW1 8 off on Page length 11 12 Tear off mode Invalid...

Page 29: ... 9 6 E 6 7 0D 0A 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 3 1 2E 3 8 2E 3 4 2 0 4 5 7 2 7 2 6 F 7 2 2 0 4 3 6 F 6E 6 4 6 9 7 4 6 9 6 F 6E 7 3 0D 0A 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 3 1 2E 3 8 2 E 3 5 2 0 4 2 7 5 7 A 7 A 6 5 7 2 2 0 4 F 7 0 6 5 7 2 6 1 7 4 6 9 6 F 6E 0D 0 A 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 3 1 2E 3 8 2 E 3 6 2 0 5 0 7 2 6 9 6 E 7 4 6 5 7 2 2 0 4 9 6E 6 9 7 4 6 9 6 1 6C 6 9 7A 6 1 7 4 6 9 6 F ...

Page 30: ...d dual density 120 Quadruple density 240 CRT graphics 80 I CRT graphics II 90 Single density 60 Dual density 120 CRT graphics II 90 Triple density 180 Hex density I 360 Dot Printing yes yes no no yes yes yes yes yes yes no 256xn2 1 Prinii eed 1 660 15 1320 7 5 1320 15 2640 7 5 880 7 5 990 10 660 15 1320 7 5 990 10 1980 5 3960 5 NOTES 1 Dot density is in dots per inch print speed is in inches per s...

Page 31: ...h time The interval between sounds is 0 1 second 0 When abnormal carriage movement is detected the buzzer sounds 5 times for 0 5 seconds each time The interval between sounds is 0 5 seconds 0 When the panel setting is accepted the buzzer sounds for 0 1 second 1 8 6 PRINTER INITIALIZATION There are two types of initialization hardware initialization and software initialization Hardware Initializati...

Page 32: ... Font selected by DIP switch Deselected if software initialization Cleared if hardware initialization Left justification 10 cpi ESC K ESC 0 ESC L ESC 1 ESC Y ESC 2 ESC Z ESC 3 All effects other than condensed printing are cleared Setting selected by DIP switch 1 8 8 ADJUST LEVER OPERATION The position of the adjust lever must be set to accord with the paper thickness If the lever is set to positio...

Page 33: ...exceeds a specified value printing is automatically suspended Printing automatically resumes when the temperature drops to another specified value If heavy duty printing causes the voltage to the head drive circuit to drop to a specified value printing is immediately suspended If the voltage recovers the line that was being printed is completed This protection occurs when half or more of the wires...

Page 34: ...main components are 1 SAMA board The main control board The CPU which is contained on this board controls all the main functions 2 SANPNL control panel The control panel 3 SANPS board 120 V Version The power supply circuit board SANPSE Board 220 240 V Version 4 M 5710 The printer mechanism I SANPS E Board M SAMA Board M 5710 Printer Mechanism Figure 1 11 LQ 510 Component Layout LQ 510 1 25 ...

Page 35: ... The use of the pPD7810HG CPU simplifies the circuitry design of the main control board REV A E05A02 Gate Array 1A 1MCG M10A17 or M10A20 PSRAM 5A 27256 PROM 6A Gate Array 71 pPD7810HG CPU 5B Figure 1 12 SAMA Main Control Board 1 26 LQ 510 ...

Page 36: ...RAL DESCRIPTION 1 9 2 SANPNL CONTROL PANEL The SANPNL control panel which is the LQ 510 s control panel contains the switches and the indicator LEDs illustrated below Figure 1 13 SANPNL Control Panel LQ 510 1 27 ...

Page 37: ...ne voltage to the 24 V 12 V 12 V and 5 VDC voltages used by the printer SANPS Board SANPSE Board Figure 1 14 Power Supply Filter Board 1 9 4 PRINTER MECHANISM M 5710 The M 5710 printer mechanism was developed expressly for use with LQ 510 printer Its components in clude a carriage motor carriage mechanism paper feed motor paper feed mechanism ribbon feed mechanism printhead and sensors Figure 1 15...

Page 38: ...g for the LQ 510 consists of upper and lower cases The upper case houses the control panel The lower case contains the printer mechanism and the main control board The printer cartridge can be removed and replaced easily Figure 1 16 Housing LQ 510 1 29 ...

Page 39: ...5 VDC Regulator Circuit 2 21 2 2 7 Voltage Limiting Circuit 2 25 2 2 8 12 VDC Supply Circuit 2 26 2 3 PRINTER MECHANISM AND CONTROL CIRCUIT OPERATION 2 27 2 3 1 Vx Voltage Supply Circuit 2 27 2 3 2 Reset Circuit 2 28 2 3 3 Address Decoder and Bank Register 2 33 2 3 4 Carriage Operation 2 35 2 3 4 1 Carriage Mechanism 2 35 2 3 4 2 Carriage Motor Specifications 2 36 2 3 4 3 Carriage Motor Drive Circ...

Page 40: ... 2 18 Figure 2 19 Figure 2 20 Figure 2 21 Figure 2 22 Cable Connections 2 2 Printer Mechanism Block Diagram 2 3 Paper End Sensor Mechanism 2 4 Paper End Sensor Circuit 2 4 Home Position Sensor Mechanism 2 5 Home Position Sensor Circuit 2 5 Thermal Sensor Mechanism Printhead Temperature Detection 2 6 Thermal Sensor Circuit 2 6 Platen Gap Sensor Mechanism 2 7 Platen Gap Sensor Circuit 2 7 Friction T...

Page 41: ...2 25 12 VDC Supply Circuit 2 26 Vx Voltage Circuit 2 27 Reset Circuit 2 28 RESET Output 2 29 RESET Pulse Oscillation Process Module Mounted 2 30 RESET Pulse Oscillation Process Module Removed 2 31 INIT Signal Input Circuit 2 32 Address Decoder 2 33 Bank Register 2 34 Carriage Mechanism 2 35 Carriage Drive Circuit Block Diagram 2 36 Gate Array Operation 2 37 Carriage Motor Drive Circuit 2 38 SLA702...

Page 42: ...veforms 2 58 Print Timing 2 59 Relationship Between Head Driving Voltage and Print Driving Pulse Width 2 59 A D Converter Circuit 2 61 Host Interface 2 63 EEPROM Circuit 2 64 Ribbon Feed Mechanism 2 65 LIST OF TABLES Board Connector Summary 2 1 Power Supply Applications 2 10 Reference Voltages 2 43 Phase Excitation Method 2 47 Drive Sequence 2 2 Excitation 2 47 Drive Sequence 1 2 Excitation 2 47 E...

Page 43: ...include the printer mechanism power supply circuits and control circuits The chapter also describes the operation of the printer s circuitry and printer mechanism 2 1 1 CONNECTOR SUMMARY The interconnection of the primary components is illustrated in Figure 2 1 Table 2 1 summarizes the func tions sizes and types of the connectors shown in the figure LQ 510 2 1 ...

Page 44: ...anism PF Friction Tractor PG CR Sensor Sensor Motor Head PE Home 2 pin 2 pin 12 pin 15 pin 17 pin SAMA Board Optional Interface Board NOTE CR carriage PF paper feed SANPS E BOARD SW Board I AC IN I Parallel I IF I Serial I F I I Host Computer I 2 2 Figure 2 1 Cable Connections LQ 510 ...

Page 45: ...er inch dpi in both horizontal and vertical directions Figure 2 2 shows a block diagram of the printer mechanism TEMP Phase Phase Printhead Temperature stepper Motor stepper Motor Carriage Drive PE ADJUST RELEASE PLATEN GAP step NOTE CW clockwise CCW counterclockwise HP home position PE paper end Release Lever Position Figure 2 2 Printer Mechanism Block Diagram LQ 510 2 3 ...

Page 46: ...sensing printhead temperature Platen Gap PG Sensor Friction Tractor Sensor Paper End Sensor PE Sensor Figures 2 3 and 2 4 show the paper end sensor This sensor switch is ON when no paper is in place e g when the paper supply has run out Paper out ON LOW Paper present OFF HIGH Paper out Figure 2 3 Paper End Sensor Mechanism Figure 2 4 Paper End Sensor Circuit 2 4 LQ 510 ...

Page 47: ...or The sensor switch is ON when the carriage is at the home position Home position ON LOW Other positions OFF HIGH The reference position for the carriage drive is determined by this sensor Home Position Sensor shaft Figure 2 5 Home Position Sensor Mechanism Figure 2 6 Home Position Sensor Circuit LQ 510 2 5 ...

Page 48: ...limit printing is automatically suspended Printing resumes when the temperature drops to a specified lower value Figure 2 8 illustrates the printer s thermal sensor circuit P r i n t h e a d Thermal Sensor Figure 2 7 Thermal Sensor Mechanism Printhead Temperature Detection Thermal Sensor in Head VAREF R50 3 3 K CN8 16 n b TEMP 10K T 0 1 CN8 17 r I AVss Figure 2 8 Thermal Sensor Circuit 2 6 LQ 510 ...

Page 49: ...n or above If the sensor is ON printing will be in multiple copy mode and the print speed will be relatively slow Adjust Lever Position 1 to 3 OFF HIGH Adjust Lever Position 4 to 7 ON LOW 2 nd position 6 th position Platen Gap Platen Gap PG Sensor Figure 2 9 Platen Gap Sensor Mechanism Figure 2 10 Platen Gap Sensor Circuit LQ 510 2 7 ...

Page 50: ...to determine whether tractor feed or fric tion feed is in effect Release Lever Position Front Friction Feed OFF HIGH level Release Lever Position Rear Tractor Feed ON LOW level Front Rear Release Lever Friction Tractor Sensor Figure 2 11 Friction Tractor Sensor Mechanism Figure 2 12 Friction Tractor Sensor Circuit 2 8 LQ 510 ...

Page 51: ...oop system Paper Feed Motor Paper is fed using a four phase 48 step motor operating with either 1 2 or 2 2 phase excitation which ad vances the paper either 1 180 inch or 1 360 inch for each phase switch The CPU controls the motor through an open loop 2 1 2 3 Printhead Figure 2 13 shows the dot wire operation When the head driving coil is energized the dot wire is pushed out The dot wire strikes t...

Page 52: ...PSE 220 24OV Ver 12OVAC or 220 240VAC 12VDC b 12VDC Figure 2 14 Overview of Power Supply Circuit Operation Table 2 2 Power Supply Applications Voltage 5 v Application Logic circuit Paper feed motor holding voltage etc 24 V 12 v VX Carriage motor drive voltage Paper feed motor drive voltage Printhead drive voltage Optional I F voltage Reset circuit Printhead data signal pull up voltage Paper feed m...

Page 53: ...2 Control Circuit Block Diagram Figure 2 15 shows a block diagram of the control circuitry ADDRESS MAPPING 0000H 4000H 8000H A000H F000H I I I NOTE CG character generator GA gate array Figure 2 15 Control Circuit Block Diagram LQ 510 2 11 ...

Page 54: ...6 CR motor control 0 E05A02 Gate Array 1 A The E05A02 was developed for 24pin dot matrix printers and is used to simplify the interface between the CPU and the printhead 0 EEPROM 7B The EEPROM has a 128 bit memory which is used to store the paper position 0 M10A17 or M10A20 Mask ROM 1M CG 4A The M10A17 or M10A20 mask ROM incorporates the character generators The ROM includes character design Other...

Page 55: ...er supply circuit block diagram The SANPS E board uses a forward convertor type switching regulator circuit and outputs 5 24 and 12 VDC The incoming AC power passes first through a noise filter then through a full wave rectifying circuit The power then passes into the main switching circuit which outputs 24 V and 12 VDC Stabilization is pro vided by an over voltage limiting circuit located on the ...

Page 56: ... to dampen incoming noise and to prevent externally generated noise from running though the AC line All the circuit s coils and condensers are designed to withstand fluctuations in the incoming AC power Figure 2 17 Filter Circuit SANPS Board 120 V Version Figure 2 16 Filter Circuit SANPSE Board 220 240 V Version 2 14 LQ 510 ...

Page 57: ...The resulting DC voltage VIN is input into the circuit 2 VIN is applied to starting resistance R7 and passes through point A Base current lB flows through tran sistor Q1 causing the transistor to conduct 3 At the same time VIN is applied to coil 4 3 of pulse transformer T1 causing a voltage of 7 60T VIN at 8 2 so that the positive feedback current of switching circuit IB flows in the direction of ...

Page 58: ...n of the diodes Therefore the secondary side outputs a voltage 7 The release of energy declines linearly over time When energy release is completed all T1 coil voltages momentarily reach zero R3 however again induces switching current lB in the direction of B and Q1 conducts Because the potential at point E then surpasses that at point A the energy in C10 is released so that IB is maintained 8 The...

Page 59: ...REV A PRINCIPLES OF OPERATION NOTE items in parentheses refer to the 220 240 V version 0 7 B2 0 n Figure 2 20 Starting Circuit Main Switching Circuit LQ 510 2 17 ...

Page 60: ...PRINCIPLES OF OPERATION REV A Output Current NOTE Items in parentheses refer to the 220 240 V version Figure 2 21 Main Switching Circuit Waveforms 2 18 LQ 510 ...

Page 61: ...e main switching transistor goes off if the voltage exceeds 24 V If excess voltage occurs reverse current flows through Zener diode ZD20 PC1 is activated and the condition of the switching circuit is as shown in Figure 2 23 r D4 C10 0 01 1 R8 ON I 24V DC GND 4 NOTE Items in parentheses refer to the 220 240 V version Figure 2 22 24 VDC Voltage Control Circuit LQ 510 2 19 ...

Page 62: ...duct if current I in the transformer s primary winding surpasses a certain value creating a potential difference of at least 2 5 V across resistance R4 Resistance R4 in other words serves as an excess current detector NOTE Items in parentheses refer to the 220 240 V version Figure 2 23 Switching Circuit During PC1 Operation NOTE Items in parentheses refer to the 220 240 V version Figure 2 24 Over ...

Page 63: ...94 can cause the IC to operate in either push pull or parallel mode In the illustration pin 13 is LOW and parallel action is in effect In other words the operation of the IC s two output transistors will be exactly alike The IC incorporates an internal oscillating circuit The oscillating frequency is determined by the external inputs to pins 5 and 6 In this circuit the frequency set by R29 and C25...

Page 64: ... conformance Voltage is output when necessary to bring the voltage at the positive terminal to 5 V Figure 2 28 shows the EA2 output conditions If the voltage of pin 16 becomes higher than that of pin 15 i e if over voltage occurs EA2 begins output PWM is activated on the basis of the output level and the circuit s output voltage is lowered Further details are provided subsequently 20µs DIV Figure ...

Page 65: ...l and in order for equal voltage to appear at the positive terminal OUTPUT VOLTAGE X R35 R34 R39 R34 I R35 becomes the load current flow see Figure 2 29 In other words higher current than this will trigger over current protection the output voltage will be reduced and the current will thereby be restricted R35 10K Figure 2 29 Over Current Protection OCP LQ 510 2 23 ...

Page 66: ...sed The wired OR of the EA1 and EA2 outputs is input to the negative terminal of the PWM a sawtooth waveform from the oscillator is input to the positive terminal and the PWM modulated waveform is output as shown in Figure 2 31 GND cl RT Et a CT El Dead Time Control Non Inv Input PWM COMPARATOR Figure 2 30 lC494 Internal Circuit Figure 2 31 PWM Output This circuit does not perform dead time contro...

Page 67: ...ching transistor Q1 goes off if the voltage on the 24 V line reaches about 30 V or if the voltage on the 5 V line reaches about 6 V Zener diode ZD22 is used to detect abnormal voltage on the 24 V line Zener diode ZD21 is used on the 5 V line 24VDC line a L __I 1 PC1 120 V Version Figure 2 32 Voltage Limiting Circuit LQ 510 2 25 ...

Page 68: ...nd 12 VDC is produced Theory suggests that load variations can cause large variations in the output voltage In particular output voltage may be quite high under no load conditions To prevent this problem dummy resistors R24 and R25 are inserted into the circuit 120 V Version 2 26 Figure 2 33 12 VDC Supply Circuit LQ 510 ...

Page 69: ...and the Vx voltage is shut off The Vx voltage is used to prevent abnormal operation of the printer when the power is switched on or off 0 Reset Circuit Power Supply When the power is switched on or off the circuit is reset so that it will not drive the printer until the power supply stabilizes 0 Pull Ups for the Printhead Signal Lines These prevent printhead malfunctions when power is switched on ...

Page 70: ... a hardware initialization signal The RESET signal is output from the circuit when any of the following occur a Power is turned on or off b A module font or identity is mounted or removed c The CPU itself generates a reset Note that initialization can occur whenever the host computer sends an INIT signal d The INIT signal is input from either the host interface or an optional interface Figure 2 35...

Page 71: ...ff The rising edge of the Vx voltage cancels the RESET signal after a delay of time constant R40 x C19 which is produced by the integration circuit of resistor R40 and capacitor C19 The falling edge of the Vx voltage activates a RESET signal by discharging capacitor C19 via diode D4 The gate array pins 49 to 51 is used for waveform shaping Vx Voltage Pin 49 of IC7A Reset output at Pin 51 of IC7A R...

Page 72: ...gly output from the DISC terminal 1 and RESET is output from the ROUT terminal 2 As the DISC terminal goes LOW capacitor C19 is discharged with a time constant R67 x C19 3 When the discharge of C19 reduces the potential at the THLD terminal to threshold voltage Vth the RESET signal is canceled 4 and the DISC terminal goes HIGH 5 After the DISC terminal goes HIGH Vx voltage discharges C19 at time c...

Page 73: ...terminal then outputs a LOW signal 1 and the ROUT terminal outputs a RESET signal 2 The remainder of the sequence is similar to that which occurs when a ROM cartridge is mounted please refer to the preceding page CAR DISC THLD Terminal Terminal Terminal ROUT Terminal RESET Signal Figure 2 38 RESET Pulse Oscillation Process Module Removed LQ 510 2 31 ...

Page 74: ... then output by the ROUT terminal INIT Signal Input from CN1 or CN2 When the INIT signal is input from either the host interface or optional interface the CPU performs initial ization From the interface the INIT signal passes through the low pass filter formed by R62 and C9 and inputs to the NMI offering terminal of the CPU The NMI offering terminal will also input the voltage of the 24 VDC line f...

Page 75: ... via address lines AB12 through AB15 and bank lines 7 and 6 in the gate array The chip select for the CS however is generated in conjunction with the RD signal and that of the RAM is generated in conjunction with the ALE signal GA E01A05 7A Address Decoder PROM 6A C E EXTERNAL PRGEX b m PROM Figure 2 40 Address Decoder Firmware performs a soft type check to determine whether an external PROM is at...

Page 76: ...it has a bank register in gate array E01A05 7A The bank lines are set by writing to address F002 hex and can be checked by reading the same address ADDRESS GA E01A05 7A Bank Register BK6 7 Address Decoder B K 0 5 e Figure 2 41 Bank Register 2 34 LQ 510 ...

Page 77: ...Figure 2 42 shows the carriage mechanism The timing belt is connected into the bottom of the carriage The belt is driven by the carriage motor and moved via the belt driven pulley The printhead is mounted on the carriage and the entire unit is moved right and left along the carriage guide shaft and plate Belt Driven Pulley Left Carriage Guide Shaft Carriage Guide Plate Driving Pulley Figure 2 42 C...

Page 78: ... speed 24 V 0 23 A typical double speed 1 5 speed normal speed 24 V Holding 0 05 A 20 2 3 4 3 Carriage Drive Circuit Block Description Figure 2 43 shows a block diagram of the carriage motor drive circuit In this circuit phase switching for the carriage motor is not directly executed by the CPU but by the gate array 7A using pulses from the CPU SLA7020M is utilized to drive the carriage motor usin...

Page 79: ...2 phase and rotation direction clockwise or counterclockwise Then after the CPU outputs a pulse to the TM terminal of the gate array the array ex ecutes auto phase switching to drive the stepper motor Figure 2 44 illustrates this process CPU CR Motor Control Part Output Signal Input Signal For a 2 2 phase excitation setting Figure 2 44 Gate Array Operation The carriage motor control port of the ga...

Page 80: ...The current value is determined by the value of the external voltage input Within the IC the AB AA phase and the CD BB phase are completely differentiated and create identical circuits For convenience only the AB AA circuit is explained below Figure 2 45 shows the carriage motor drive circuit Figure 2 46 shows the SLA7020M circuit diagram Figure 2 45 Carriage Motor Drive Circuit 2 38 LQ 510 ...

Page 81: ...REV A PRINCIPLES OF OPERATION NOTE Phase CD is equivalent to the above Figure 2 46 SLA7020M Circuit Diagram LQ 510 2 39 ...

Page 82: ...xcitation signal input is via a single line The output is divided among non inverted A phase output and k phase output passed through an inverter Therefore the A phase output side will be ON when the excitation input signal is HIGH And the A phase output side will be ON when the excitation input signal is LOW Figure 2 48 shows the timing chart for 2 2 phase excitation Figure 2 47 Phase Data Input ...

Page 83: ...OW the SLA702M can cut off the output current By using this function the unaltered 2 phase excitation signal can cause the 1 2 phase excitation to be ON 3 8ths of the time which is a suitable value Figure 2 50 shows the timing chart Phase A Figure 2 49 Phase Data Input Circuit 1 2 Phase Figure 2 50 Phase Signal Timing Chart 1 2 Phase LQ 510 2 41 ...

Page 84: ...ontrol to be performed easily the circuit is constructed as shown in Figure 2 50 Further if the CRENB signal is made HIGH the Td terminal becomes LOW and stepping of the motor is forced to stop TdA Figure 2 51 Phase Data Conversion Circuit 2 42 LQ 510 ...

Page 85: ...pper motor based on current proportional to the reference voltages set here There are four stages of reference voltage values motor drive current values and these are switched to correspond to the drive speed of the motor Figure 2 52 Reference Voltage Generation Circuit PBO H H L H Table 2 3 Reference Voltages PB1 PB2 Reference Voltage H L 0 322 V L H 0 267 V H H 0 223 V H H 0 071 v LQ 510 2 43 ...

Page 86: ...ase only and the waveforms for each part are shown in Figure 2 54 In Figure 2 53 the reference voltage is indicated by VREF this voltage deter mines the peak current through resistance R6 Resistance R10 and capacitance C46 determine the OFF time of the chopper kc 24V REFA Figure 2 53 Constant Current Control Circuit 2 44 LQ 510 ...

Page 87: ...ut IN goes ON so does MOSFET Q1 The A coil excitation current ION then flows along the route shown by the solid line 2 As ION increases so does the voltage at R6 3 When R6 voltage exceeds VREF COMP 1 inverts and the TD voltage falls to near zero 4 When VTD drops below the COMP2 threshold voltage COMP2 inverts 5 COMP2 inversion causes Q1 gate voltage to go LOW and Q1 goes OFF LQ 510 2 45 ...

Page 88: ...e C46 The MOSFET gate voltage is maintained at OFF until the value of the TD voltage reaches the COMP2 reference voltage of 2 V The period above during which VTD is rising from 0 V to 2 V is equivalent to TOFF Chopper ON Time t2 t3 10 When TD voltage VTD reaches the COMP2 reference value 2 V COMP2 inverts and Q1 goes on 11 When Q1 goes on the current flow switches from IOFF to ION 12 On the basis ...

Page 89: ... Speed Phase Excitation Method x3 900 pps 2 2 Phase x2 600 pps 2 2 Phase x15 900 pps 1 2 Phase x1 600 pps 1 2 Phase pps pulses per second Table 2 5 Drive Sequence 2 2 Excitation Table 2 6 Drive Sequence 1 2 Excitation CR DIRECTION Left Right Right Left Step No Phase A Phase B Phase C Phase D Phase A Phase B Phase C Phase D 1 ON OFF OFF ON ON OFF ON OFF I 2 ON OFF 1 OFF 1 OFF ON 1 OFF 1 OFF 1 OFF I...

Page 90: ...hold at any position and switch printing direction The carriage motor control system is an open loop system which switches the phases in accord ance with set speeds Acceleration area Print In area Accelerating Deceleration Iconstan speed area Decelerating Figure 2 55 Carriage Motor Control 2 48 LQ 510 ...

Page 91: ...cutes 2 2 phase excitation for 20 or 30 ms regardless of the phase switching timing and checks the HOME signal The result of this check determines whether the starting posi tion should be 1 or 2 The carriage enters the home position only once during the initialization k IHome Position Area r I I I CR Movable Area Printing Area 0 I 1 4steps I r End of Home Position Seek Constant Constant Accelerati...

Page 92: ...ond dpi dots per inch Figure 2 57 Printing Area and Printing Timing Abnormal Carriage Operation This unit does not employ a print timing signal PTS sensor and cannot detect abnormal carriage operation Therefore no error occurs even if carriage movement is prevented by external forces An error occurs if the HOME signal is received in the printing area in which case the carriage stops 2 50 LQ 510 ...

Page 93: ...aper feed motor is driven to rotate the platen gear via the paper feed reduction gear in the direction shown in Figure 2 58 The rotation of the platen gear feeds the paper in the direction of the arrow as a result of friction from the paper feed rollers and platen Because the paper is held against the platen by the spring force of the paper feed rollers the paper can be released by shifting the pa...

Page 94: ...e of the paper feed rollers against the platen is released by moving the paper release lever to its forward setting Paper Tension Roller P a p e r C o n t i n u o u s b Tractor Reduction Gear I Tractor Gear Paper Feed Reduction Gear Paper Feed Motor Pinion Gear r Feed Motor Figure 2 59 Push Tractor Feed Operation 2 3 5 2 Paper Feed Motor Specifications Paper feed motor specifications are as follow...

Page 95: ...feed motor is a stepper motor that can utilize either 2 2 phase or 1 2 phase excitation When paper feed signal PA4 is set to LOW Q27 is turn ed on and 24 V is supplied to the motor When the paper feed motor is not driven 5 V is supplied via resistor R30 and diode D3 to hold the motor Figure 2 60 Paper Feed Motor Drive Circuit LQ 510 2 53 ...

Page 96: ...tation is used only when it is necessary to achieve a drive distance of 1 360 inch Table 2 7 shows the paper feed motor excitation system Table 2 7 Excitation Sequence Clockwise Paper Feeds Forward 2 2 Phase Excitation NOTE If the paper feed motor is driven counterclockwise paper is fed in reverse Figure 2 61 shows the paper feed motor drive timing chart For 2 2 phase excitation Figure 2 61 Paper ...

Page 97: ...te spring causes the actuating plate to return to its initial position After striking the platen the dot wire also returns to its initial position partly in response to the impact energy and partly as a result of the wire resetting spring The dot wire then remains engaged to the actuating plate until it is driven again Figure 2 62 illustrates the printhead printing operation Platen Dot Wire Ribbon...

Page 98: ... data latch The CPU determines the pulse width for the head wire drive pulses from gate array E05A02 by monitoring the printhead drive power 24 V line The CPU also monitors the printhead temperature and suspends printing if the temperature becomes too high Figure 2 63 Printhead Drive Circuit Block Diagram 2 56 LQ 510 ...

Page 99: ...s shown in Table 2 8 Table 2 6 E05A02 Gate Array Functions r Address Hex Function F004 Outputs a command Bit 7 Data latch writing sequence set up 0 Ascending order 1 Descending order F005 Bit 6 HPW valid invalid setting Bit 5 Counter resetting Bit 4 to Bit 0 Optional Latches data and increases the counter When latching data the data is NANDed with the contents of the current latch and is pro tecte...

Page 100: ...rive pulse width is adjusted using CPU port PC6 The Vx voltage is used to pull up the output signals from the gate array in order to prevent printhead malfunctions 5v CPU PC6 Figure 2 64 Printhead Drive Circuit 2V DIV Figure 2 65 Printhead Driving Waveforms 2 58 LQ 510 ...

Page 101: ...thead solenoid drive frequency 900 Hz The drive pulse width is ad justed by using an A D converter to detect the drive voltage and is kept within the area shown by the oblique lines in Figure 2 67 Printhead Specifications Figure 2 66 Print Timing I 2 1 6 2 2 5 2 4 0 2 5 0 2 6 0 2 2 0 2 3 0 26 4 Drive Voltage V V Figure 2 67 Relationship between Head Driver Voltage and Print Driving Pulse Width LQ ...

Page 102: ...s value of the setting of the bidirectional adjustment DIP switches l Reads the control panel switches The circuit s reference voltage VREF is set based on shunt regulator TL431 CLPB R44 and R45 as follows VREF 2 5 v R45 R45 R44 4 5 V NOTE The shunt regulator reference voltage value is 2 5 V With this voltage serving as the reference the 24 V line is monitored by AN6 the head temperature is monito...

Page 103: ...REV A PRINCIPLES OF OPERATION LQ 510 Figure 2 68 A D Converter Circuit 2 61 ...

Page 104: ...PRINCIPLES OF OPERATION REV A Table 2 9 shows the relationship between the scan lines and DIP switches Table 2 9 Scan Lines and DIP Switches 2 62 LQ 510 ...

Page 105: ...d C42 and flow into the STRB terminal These pulses latch the parallel data and set the BUSY signal HIGH so that subsequent data transfer is inhibited The gate array PINT terminal is automatically output by the STRB signal to request a CPU interrupt When the CPU receives this interrupt request it reads the data latched in the gate array LS07l8A R96 220K Figure 2 69 Host Interface LQ 510 2 63 ...

Page 106: ...y space In order to write to the EEPROM CPU port PA5 goes HIGH Once the EEPROM has been selected the data to be sent is set in bank line B2 and is fed bit by bit to the EEPROM in line with rising pulses from bank line B1 s clock Data is read bit by bit in line with falling clock pulses The EEPROM receives com mands to indicate whether to read or write data and to indicate addresses B2 B1 CPU µPD 7...

Page 107: ... gear 1 arrow d Platen gear 3 Platen gear 4 Ribbon driving gear Figure 2 71 shows the ribbon feed mechanism The inked ribbon is held in the cartridge case between the ribbon feed and the ribbon pressure roller mounted on the ribbon driving gear The ribbon configuration is such that the ribbon can feed endlessly The ribbon driving gear drives the rollers which causes the ribbon to be fed To prevent...

Page 108: ...nance for the Cut Sheet Feeder 3 15 3 3 4 1 Cleaning 3 15 3 3 4 2 Lubrication 3 15 3 4 C80006 PULL TRACTOR 3 17 3 4 1 Pull Tractor Operation 3 17 3 4 2 Pull Tractor Disassembly and Assembly 3 18 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 8 Figure 3 7 Figure 3 8 Figure 3 9 Figure 3 10 Figure 3 11 Figure 3 12 Figure 3 13 LIST OF FIGURES External Appearance of the Multi Font Modu...

Page 109: ...e 3 17 Direction of Paper Guide Roller Removal 3 19 Figure 3 18 Direction for Insertion of Sprocket Wheels 3 20 LIST OF TABLES Table 3 1 Optional interfaces 3 1 Table 3 2 Jumper Settings 3 2 Table 3 3 DIP Switch Settings 3 2 Table 3 4 Bit Rate Settings 3 3 Table 3 5 Character Sets 3 4 Table 3 6 DIP Switch Selections 3 9 Table 3 7 Tools for Assembly or Disassembly 3 11 Table 3 8 Lubricants 3 15 3 i...

Page 110: ...e optional Model 8143 interface the printer can support the RS 232C data protocol and a 20 mAA neutral current loop Specifications Synchronization Bit rate Word length Start bit Data bits Parity bit Stop bit Signal level RS 232C Current loop Handshaking l Selectable by DIP switch Asynchronous 75 to 19200 bps l 1 bit 7 or 8 bits Odd even or none 1 bit or more Mark logical 1 3 to 27 V Space logical ...

Page 111: ...SW No Function ON OFF 1 1 JB3 Bit rate selection See Table 3 4 I 1 2 J8 7 1 3 JB1 1 4 JB2 1 5 JO E Data length selection Bit rate selection Bit rate selection Parity selection 7 bit 8 bit See Table 3 4 See Table 3 4 Even I Odd I 1 6 JPDS I Parity selection I See Table 3 4 1 7 P S 8143 selection I Enabled Disabled 3 2 LQ 510 ...

Page 112: ...at it is not ready to receive data by outputting the X OFF code and or REV signal polarity can be selected by jumper set ting When the available buffer space reaches 528 bytes the printer indicates that it is ready to receive data by outputting the X ON code and or changing the REV signal Error Handling An asterisk is printed when a parity error is detected Other errors e g overrun error and frami...

Page 113: ...e Multi Font Module At power up the font choice is based on the setting of the module s rotary switch Settings 2 through 8 in dicate fonts shown in Table 3 5 If the switch is set to 0 1 or 9 the printer ignores the module Font selection occurs immediately following the printer selection of the module slot and the module must be in stalled at that time if font selection is to occur Table 3 5 Charac...

Page 114: ...res 1 Cut sheets may be handled in the same way as fanfold paper 2 Sheets may be inserted manually 3 The feeder is mounted and dismounted easily from the printer 4 The feeder requires no electrical connection to the printer 5 The feeder is extremely reliable 6 A high level of performance can be achieved Figure 3 2 LQ 510 with Cut Sheet Feeder LQ 510 3 5 ...

Page 115: ...idity range 15 to 80 with no condensation Storage humidity range 5 to 85 with no condensation 3 3 1 2 Paper Specifications Cut sheet paper must be new or like new must not be curled or curved and must be free of surface and edge damage Paper type and quality Plain bond typewriter or PPC quality paper with a minimum wood pulp content NOTE Paper with higher wood content very light and very heavy pap...

Page 116: ...12 3 mm min Printable area 33 8 5 mm Printable area Figure 3 3 Printable Area NOTES The printable length is approximately 0 87 inches 22 mm less than the actual page length Paper feed accuracy cannot be assured within 0 87 inches 22 mm from either top or bottom edge LQ 510 3 7 ...

Page 117: ...44 mm width x 17 1 inches 434 mm depth x 16 4 inches 416 mm height including paper feed knob NOTE Dimensions were measured with the cut sheet feeder mounted on the printer 17 1 434 mm w Weight I w 1 Figure 3 4 Dimensions Approximately 2 42 pounds 1 1 kg excluding covers 3 6 LQ 510 ...

Page 118: ...DIP Switch The cut sheet mode is set by DIP switch as shown in the table below Table 3 6 DIP Switch Selection DIP Switch Function 1 8 Cut Sheet Feeder Mode ON Valid OFF Invalid Selection by Command After the cut sheet feeder has been mounted on the printer the following command can be used Command Format ESC EM CHR 27 CHR 25 n where n signifies the following n 0 cancels the CSF mode n 4 specifies ...

Page 119: ...comes into contact with the platen the rotation of the paper feed motor changes to the forward direction and the gears rotate in the direction indicated by the black arrows Friction causes the paper to advance between the platen and the paper feed rollers As it advances the paper is further guided by the paper ejecting rollers Figure 3 5 illustrates the feed operation Paper Cut Sheet riving Transm...

Page 120: ... A 34 which are provided as reference for disassembly and reassembly show an exploded view of the parts configuration The required tools are listed in Table 3 7 Table 3 7 Tools for Assembly or Disassembly Tool Availability Part No Phillips screwdriver no 2 0 8743800200 E ring holder 6 I 0 1 8740800800 o commercially available WARNING If it is necessary to replace one of the paper loading rollers b...

Page 121: ...vers L and R Side cover L Side Cover R Figure 3 6 Side Cover Removal 2 Remove the E ring 6 on the paper loading roller shaft and then remove the shaft E ring 6 Paper Loading Roll Shaft Figure 3 7 Paper Loading Roller Shaft Removal 3 12 LQ 510 ...

Page 122: ... 3 Remove the two E rings 6 on the paper support shaft E ring 6 E ring 6 Figure 3 8 E Ring Removal 4 Remove the shaft holder fastening the paper support shaft to frame L Shaft Holder Figure 3 9 Shaft Holder Removal LQ 510 3 13 ...

Page 123: ...T REV A 5 Remove the E ring 6 on the paper support shaft see Figure 3 10 6 Lift the hopper unit and the paper support shaft together Paper Loading Roller Shaft Holder E ring 6 Figure 3 10 Hopper Unit Removal 3 14 LQ 510 ...

Page 124: ...ollers If the printer fails to move the paper open the right side cover and check the gear wheels for wear or damage 3 3 4 2 Lubrication Epson recommends that the points indicated in Figures 3 11 and 3 12 be lubricated with Epson O 3 and G 14 see Table 3 8 These lubricants have been thoroughly tested and have been found to comply fully with the needs of the cut sheet feeder Table 3 8 Lubricants Ty...

Page 125: ...OPTIONAL EQUIPMENT REV A 3 16 Figure 3 12 Lubrication Points 2 LQ 510 ...

Page 126: ...l and also onto the tractor pins along the tractor belt The paper feed motor is driven via the pinion on the motor s shaft to rotate the gears in the direction shown in Figure 3 13 The gears in turn rotate the sprocket wheels and tractor belt advancing the paper in the direction indicated by the arrow Shifting the release lever forward moves the feed rollers away from the platen and releases the f...

Page 127: ... the sprocket gear the sprocket gear spring and the washer 3 Remove the E ring 6 on the inside of mounting plate R Mounting Plate R Washer cket Gear Spring Gear and Related Parts shaft from mounting plate L Sprocket Reduction Gear Figure 3 14 Removal of Sprocket Reduction 4 Pull to remove the sprocket shaft and the sprocket support Mounting Plate L Sprocket Support Shaft Figure 3 15 Removal of Spr...

Page 128: ...e sprocket shaft and the sprocket support shaft pull and remove sprocket set R the paper guide roller and sprocket set L In separating the paper guide roller pull in the same direction as the side on which the T shaped notch is located When reassembling insert from the same side T Shaped Notch Sprocket Shaft Paper Guide Roller Figure 3 17 Direction of Paper Guide Roller Removal LQ 510 3 19 ...

Page 129: ...cated in Figure 3 18 2 When inserting the sprocket roller into the sprocket shaft the marked sides of both wheels should face to the left and the markings should be analogously positioned Sprocket Shaft The longer portion the right side Marks to be Matched goes on Figure 3 18 Direction for Insertion of Sprocket Wheels 3 20 LQ 510 ...

Page 130: ... 5 4 2 5 6 4 2 5 7 4 2 5 8 4 2 5 9 Removal of the Paper Feed Mechanism 4 15 Removal of Paper Feed Motor Release Lever and Release Tractor Sensor 4 17 Removal of Paper End Sensor 4 19 Disassembly of Platen Unit 4 19 Removal of Carriage Unit 4 20 Removal of Carriage Motor 4 23 Removal of Home Position Sensor 4 24 Disassembly of Ribbon Feed Mechanism 4 24 Disassembly of Tractor Unit 4 25 4 3 ADJUSTME...

Page 131: ...oval of Paper Feed Rollers 4 15 Removal of Paper Guide Plate 4 16 Mounting Direction for Paper Guide Plate 4 16 Removal of Paper Feed Motor 4 17 Spring and Gear Removal 4 17 Removal of the Release Lever 4 18 Removal of the Release Tractor Sensor 4 18 Removal of Paper End Sensor 4 19 Platen Unit Reassembly 4 19 Bottom View of Printer Mechanism 4 20 Removal of Carriage Guide Shaft Ground Plate 4 20 ...

Page 132: ...NT LIST OF TABLES Table 4 1 Repair Tools 4 1 Table 4 2 Measuring Instruments 4 1 Table 4 3 Abbreviations for Small Parts 4 2 Table 4 4 Form and Abbreviated Part Name of Screw 4 2 Table 4 5 Draft Mode 4 29 Table 4 6 LQ Mode 4 30 LQ 510 4 iii ...

Page 133: ...pair Table 4 1 Repair Tools Description Type Part No Brush no 1 0 B741400200 Brush no 2 0 B741400100 Cleaning brush 0 B741600100 Round nose pliers 0 B740400100 Diagonal cutting nippers 0 B740500100 Tweezers 0 B641000100 Soldering iron 0 B740200100 E ring holder 2 5 0 B740800400 E ring holder 5 0 B740800700 Phillips screwdriver no 2 0 B743800200 Screwdriver no 0 0 B743800300 Thickness gauge 0 44 0 ...

Page 134: ...t B tight screw Cross recessed Bind head Cone point S tight screw Table 4 4 correlates the forms of the screws with their abbreviated part names Table 4 4 Form and Abbreviated Part Name of Screw Head 1 Cross recessed head 0 0 2 Slotted head e 1 Bind 0ra II with Notch 2 Pan m 3 Cup 4 Truss Body Washer assembled 1 Normal 1 Plain washer 0 2 Tap tight Stight Btight 3 Tapping 0 0 0 8 2 Outside toothed ...

Page 135: ... that you have read Section 4 1 General Repair Information n before performing disassembly Remove paper and the ribbon cartridge before disassembly The disassembly procedure detailed below is completed in the following sequence 1 removal of the print head 2 removal of the cases 3 removal of the circuit boards 4 removal of the printer mechanism unit and 5 disassembly of the printer mechanism Explod...

Page 136: ...to the carriage by pulling them down Then lift and remove the printhead Printhead Head Cable Figure 4 2 Printhead Removal 4 Disconnect the head cables from the connector on the printhead NOTE For the European version of the printer a net is mounted on the printhead 4 4 Figure 4 3 Net LQ 510 ...

Page 137: ...the upper case and the control panel SANPNL 4 2 2 1 Upper Case Removal 1 Remove the sheet guide assembly printer cover and paper feed knob 2 Push in the two notches securing the push tractor to the printer mechanism and remove the push trac tor from the printer mechanism Figure 4 4 Push Tractor Removal LQ 510 4 5 ...

Page 138: ... notches Upper Case Guide Upper Case Guide The notch can be unlocked by pushing it in the direction shown by the arrow using the screwdriver Figure 4 5 Upper Case Removal 1 Figure 4 5 Upper Case Removal 1 Lower Case Notch Notch 4 While lifting the upper case disconnect the cable of the control panel SANPNL from connector CN4 on the SAMA board Then remove the upper case Figure 4 6 Upper Case Remova...

Page 139: ...ol Panel SANPNL Removal 1 Remove the upper case as described in the previous section 2 Turn the upper case over push in the two notches on the case that secure the control panel to it and remove the control panel Figure 4 7 Control Panel Removal LQ 510 4 7 ...

Page 140: ...ing connectors on the SAMA board connec ting it to external components should be disconnected CN5 red CN6 yellow CN7 white CN8 flexible flat cable or FFC CN9 FFC CN13 black CN12 white CN11 white and CN10 white Do not pull roughly on the connectors or you may damage the board Remove them by pulling gently while holding the board at the same time m CN12 CBB C M3x8 Screw SAMA Board CN10 CN11 CBS C M3...

Page 141: ...e base plate and the lower case 4 Loosen the four bent tabs on the lower case securing it to the SAMA board Then remove the SAMA board to cause damage to components on the SAMA board NOTES FOR REASSEMBLY The figure below shows the appropriate way to handle the cable connecting the SAMA and SANPS E boards Figure 4 9 Cable LQ 510 4 9 ...

Page 142: ...or CN1 from the SANPS E board This connector connects the board to the power switch 3 Disconnect connector CN2 from the SANPS E board This connector connects the board to the SAMA board 4 Remove the CBS c M3 x 8 screws securing the SANPS E board and then remove the board I SANPS E Board CN1 CBS c Figure 4 10 SANPS E Board Removal 4 10 LQ 510 ...

Page 143: ...nit and paper guide are removed first to enable quick and easy removal of the printer mechanism Figure 4 11 Printer Mechanism Removal 4 2 4 1 Removal of Platen Unit and Paper Guide 1 Remove the upper case refer to Section 4 2 1 1 2 Remove the cover of the paper tension unit 3 Open the cover Pull out Tension Unit Cover Figure 4 12 Removal of Paper Tension Unit Cover LQ 510 4 11 ...

Page 144: ...inter mechanism b Roll paper tension unit toward printhead and lift straight up Figure 4 13 Paper Tension Unit Removal 4 Turn the shaft holders at the left and right sides of the platen unit as shown in Figure 4 14 Lift and remove the platen unit a Use a screwdriver to push the shaft holder outward b Turn the shaft holder counterclockwise Shaft Holder Figure 4 14 Platen Unit Removal 4 12 LQ 510 ...

Page 145: ...orward from the rear side of the printer mechanism Remove the paper guide Guide Tab Tab Figure 4 15 Rear View of Printer Mechanism REQUIRED ADJUSTMENT If following the reinstallation or replacement of the platen unit problems occur such as non uniformity of print density adjust the platen gap Platen gap adjustment is detailed in Section 4 3 1 LQ 510 4 13 ...

Page 146: ...he printer mechanism Refer to Figure 4 6 4 With a screwdriver push and loosen the six tabs securing the printer mechanism to the lower case For easiest removal follow the procedure below WARNING Be sure to push the tabs GENTLY so not to damage the lower case or printer mechanism I I Figure 4 18 Printer Mechanism Removal a Loosen tabs 1 and 2 and lift the left side of the frame about half an inch 1...

Page 147: ...hanism Figure A 32 shows an exploded diagram of the printer mechanism illustrating the various components Table A 22 lists the components by name 4 2 5 1 Removal of the Paper Feed Mechanism 1 Remove the printer mechanism refer to Section 4 2 4 2 Remove the three paper feed rollers from the frame Figure 4 17 Removal of Paper Feed Rollers LQ 510 4 15 ...

Page 148: ...and spacer to the frame and lift and remove the plate Spacer Figure 4 18 Removal of Paper Guide Plate NOTES FOR REASSEMBLY When remounting the paper guide plate and spacer to the frame refer to Figure 4 19 for the mounting direction 4 16 Figure 4 19 Mounting Direction for Paper Guide Plate LQ 510 ...

Page 149: ...he motor cable from the paper feed motor 3 Loosen the two bent tabs on the frame securing the paper feed motor and remove the paper feed motor 4 Remove the tractor reduction gear spring the tractor reduction gear and the paper feed reduction gear Frame R Feed Motor Bent Tabs Figure 4 20 Removal of Paper Feed Motor Paper Feed Reduction Gear Figure 4 21 Spring and Gear Removal LQ 510 4 17 ...

Page 150: ...e frame push the notch of the release lever outward Remove the release lever Lever Figure 4 22 Removal of the Release Lever 6 Push the two notches securing the release tractor sensor and remove the sensor Push Figure 4 23 Removal of Release Tractor Sensor 4 18 LQ 510 ...

Page 151: ...4 Disassembly of Platen Unit 1 Remove the platen unit refer to Section 4 2 4 1 2 Remove the left shaft holder 3 Pull out the platen gear on the right side of the platen unit 4 Remove the E ring from the platen and pull out the right shaft holder and the flat spring NOTES FOR REASSEMBLY When reassembling the platen unit refer to Figure 4 25 and be sure that the flat spring and shaft holder are inst...

Page 152: ...belt should be visible through the cut out Figure 4 26 Bottom View of Printer Mechanism Using round nose pliers detach the timing belt from the carriage unit Be careful not to cause any damage Lift portion A see Figure 4 27 of the carriage guide shaft ground plate to free the plate from the notch on the carriage motor frame Slide the plate so that it can be removed from the frame through the cut o...

Page 153: ...t A Rotate the lever on the right side of the guide shaft clockwise and remove it in the same way Frame Figure 4 28 Removal of Carriage Guide Shaft 7 Push the notch on the frame that is securing the carriage guide plate and slide the plate to remove it Carriage Guide Plate Figure 4 29 Removal of Carriage Guide Plate 8 Lift and remove the carriage unit the carriage guide shaft and the head adjust l...

Page 154: ...rriage Guide Shaft and Head Adjust Lever 2 The lever for the left side of the guide shaft is gray the lever for the right side is black Slide each lever onto the appropriate side of the shaft 3 When connecting the head cable be sure to pass it correctly through the FFC guide on the frame Following reassembly of the carriage unit adjust the platen gap Platen gap adjustment is detailed in 4 22 LQ 51...

Page 155: ...me to the chassis frame Remove the carriage motor frame Tabs Figure 4 31 Carriage Motor Frame Removal 4 Remove the belt tension spring from the carriage motor frame Remove the E type 3 2 retaining ring on the carriage motor side then remove the plain washer belt pulley shaft holder belt pulley and timing belt Retaining E Ring 3 2 Plain Washer i G Bait Pulley Flange w Belt Pulley Shaft Holder Carri...

Page 156: ...osition sensor and remove the sensor from the carriage motor frame Home Position Sensor Carriage Motor Connector Figure 4 33 Removal of Home Position Sensor 4 2 5 8 Disassembly of Ribbon Feed Mechanism 1 Remove the printer mechanism refer to Section 4 2 4 2 2 Turn the printer mechanism upside down and use a screwdriver to loosen the four bent tabs securing the ribbon gear cover slightly Only loose...

Page 157: ...he tractor shaft from the tractor frame 3 Pull and remove the sprocket guide shaft from the tractor frame Tractor Frame L Figure 4 35 Removal of Tractor Frame L 4 Remove tractor set L the paper support and tractor set R from the tractor and sprocket guide shafts Figure 4 36 Removal of Tractor Set L Paper Support and Tractor Set R LQ 510 4 25 ...

Page 158: ...REV A DISASSEMBLY ASSEMBLY AND ADJUSTMENT NOTES FOR REASSEMBLY When reassembling align the phases as shown below Figure 4 37 Tractor Phase Alignment 4 26 LQ 510 ...

Page 159: ...t levers or if printing is abnormal adjust the gap between the platen and the printhead 1 Remove the printhead Using tweezers remove the ribbon mask by pulling it slightly forward then lifting 2 Reinstall the printhead Carriage 3 Set the head adjust lever to the second position 4 Set the release lever to the friction feed position back position 5 Manually move the carriage to column 10 CAUTION Whe...

Page 160: ...t Carriage guide shaft left Carriage guide shaft right Clockwise rotation widens gap Counterclockwise rotation narrows gap Clockwise rotation narrows gap Counterclockwise rotation widens the gap Perform gap adjustment at the 10th and 70th column positions and also at the center of gaps at all three positions should match the platen The t A A 2 3 Figure 4 41 Platen Gap Adjustment Position 4 28 LQ 5...

Page 161: ...t generally occurs when the carriage is moving from left to right Table 4 5 Draft Mode Control Value DIP SW l l 1 2 1 3 1 4 Direction and Value of Shift 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 ON ON ON ON ON ON ON OFF ON ON OFF ON ON ON OFF OFF ON OFF ON ON ON OFF ON OFF ON OFF OFF ON ON OFF OFF OFF OFF OFF OFF ON OFF OFF ON OFF OFF OFF ON ON OFF ON OFF OFF OFF ON OFF ON OFF ON ON OFF OFF ON ON ON T z40 inc...

Page 162: ...ON OFF OFF ON OFF OFF OFF ON ON OFF ON OFF OFF OFF ON OFF ON OFF ON ON OFF OFF ON ON ON 1 720 inch 2 720 inch 3 720 inch 4 720 inch 5 720 inch 6 720 inch 7 720 inch m e I 4 Printing starts n 720 inch to the right of the reference position NOTE If all DIP switches are OFF the control values will be set to the provisional test values 4 3 4 2 Adjustment Procedures Because the adjustment mode is incor...

Page 163: ...ven and Left 1 odd number lines misaligned horizontally 1 Pressing the FF switch once ad Pressing the LF switch once ad justs by 1 No i misalignment justs by 1 4 Press the online switch to print out the newly adjusted pattern Press the online switch to print out the newly adjusted pattern Set the DIP switches as required based on the results of the printing i I The buzzer sounds I Figure 4 41 Proc...

Page 164: ...DISASSEMBLY ASSEMBLY AND ADJUSTMENT REV A SW Adjustment SW1 5 ON 1 6 ON 1 7 OFF 1 8 OFF Figure 4 42 Bidirectional Adjustment Pattern LQ 510 ...

Page 165: ...echanism Unit Repair 5 21 LIST OF FIGURES Figure 5 1 Printhead Resistance 5 6 Table 5 1 Unit Replacement Numbers 5 1 Table 5 2 Symptom and Reference Pages 5 2 Table 5 3 Troubleshooting Tools 5 10 Table 5 4 SANPS E Board Parts List 5 10 Table 5 5 SANPS E Board Unit Repair 5 11 Table 5 6 SAMA Board Parts List 5 14 Table 5 7 SAMA Board Unit Repair 5 15 Table 5 8 Printer Mechanism Repair 5 21 LIST OF ...

Page 166: ...values that should be checked for If trouble occurs in the printer mechanism refer to Section 5 3 3 which specifies procedures for identifying defective components and the replacements adjustments and lubrication which should be carried out 5 2 UNIT REPLACEMENT This section correlates symptoms with the potentially defective units that may be causing them The unit numbers are listed in Table 5 1 Ta...

Page 167: ......

Page 168: ...on Use correct AC input voltage Replace the fuse and F1 on the SANPS E and disconnect CN2 on r ON again Is the new the SANPS E board Measure the output voltage from SANPS E board I Replace the SANPS E board or transformer I Replace the SAMA mechanism END x7 LQ 510 5 3 ...

Page 169: ...TROUBLESHOOTING REV A 2 Abnormal Carriage Operation connecting the SAMA circuit board and the printer Yes Secure connectors mechanism Replace the SAMA circuit board 5 4 LQ 510 ...

Page 170: ... Normal Set the gap adjustment lever at the second posi tion and perform self test 1 Yes Are measurement I Replace the printherd I No Ir END V TROUBLESHOOTING Replace the SAMA circuit board Yes I 1 1 Reinsert the correctly Replace the SAMA circuit board I v LQ 510 5 5 ...

Page 171: ...4 17 9 1 I d d TEMP1 4 8 16 COM 21 13 5 Terminal Assignment 0 1 0 3 0 5 0 7 0 9 0 11 0 13 0 15 0 17 0 19 0 21 0 23 x220 II240 Wire Assignment Coil Resistance 19 1 kl 0 at 25 C Between each dot wire and common Figure 5 1 Printhead Resistance 5 6 LQ 510 ...

Page 172: ...REV A 4 Abnormal Paper Feed but Normal Printing Replace the SAMA circuit board I TROUBLESHOOTING Load the paper correctly Replace the printer mechanism END LQ 510 5 7 ...

Page 173: ...OOTING 5 Abnormal Control Panel Operation Reinsert connector CN4 correctly Yes Replace the SAMA circuit board REV A Replace the control panel Replace the control Replace the SAMA circuit board END 77 5 8 LQ 510 ...

Page 174: ...REV A TROUBLESHOOTING 6 Faulty Printing in ON LINE Mode NOTE It is assumed here that the host computer is operating normally I Perform self test 1 Yes Replace the SAMA circuit board LQ 510 5 9 ...

Page 175: ...Description Check the driver circuit by reading the LED indication Part Number B765113101 5 3 1 SANPS SANPSE POWER BOARD UNIT REPAIR The following chart shows the main components used on the SANPSE board Table 5 4 SANPS E Board Parts List Board Name SANPS E SANPS SANPSE Location Part Names Description Part No IC1 L5431 AA Adjustable Precision Regulator X440164319 IC20 TL494CN PWM Control X44003494...

Page 176: ... SANPS E Power Board Unit Repair Cause Transformer oils are open Q1 is dead 23 IC1 Cl or ZD20 is dead Q2 is dead Checkpoint Measure the resistance of T1 transformer coils 4 3 6 2 11 12 Check voltage wave forms at Q3 collector Check voltage waveforms at Q2 collector Solution Replace T1 Replace Q1 Replace Q3 IC1 PC1 or ZD20 Replace Q2 LQ 510 5 11 ...

Page 177: ...nter does The voltage The 24 V Check the 24 V line not operate at 5 V line line is dead at all is dead IC20 is Check the oscillation waveform and the switching Replace dead waveform IC20 Switching waveform IC20 pin 8 Q20 or Q21 Check the switching waveform Replace is dead either Q20 or Q21 Q20 collector 5 12 LQ 510 ...

Page 178: ...e Voltage on The 24V the 12V power line is dead supply circuit is dead Fuse resistor R31 or R32 is open Transformer coils are open Checkpoint Check the 24 V line Solution Measure the resistance values of R31 and R32 Replace either R31 or R32 Measure the resistances of transformer coils 7 8 8 11 Replace T1 LQ 510 5 13 ...

Page 179: ...40070200 3B 74LS06 Hex lnverter X420300060 8A 8B 74LS07 Hex Buffer X420300070 2A 74LS38 Quad 2 In NAND Buffer X420380380 7B 74LS152 10 Step Real Cord X420301520 6B TL431CLPB Adjustable Precision Shunt Regulator X440034313 Q30 31 35 2SA1015 TPE2 Transistor 50 V 150 mA 400 mW X300101509 Q34 2SA1020 TPE6 Transistor 50 V 2 A 900 mW X300102009 Q27 2SB1093 T Transistor 80 V 1 5 A 1 W X301109309 Q32 33 2...

Page 180: ... The reset circuit is not operating NIT signal input circuit is dead Checkpoint Check voltage waveforms for the Vx voltage and for the 24 V line Check voltage waveforms at Vx voltage and for the RESET signal Check voltage waveforms for the 24 V line and for he NMI interrupt signal NM1 Solution Replace ZD1 Q33 or Q34 Replace IC7A Replace IC3B or Q32 LQ 510 ...

Page 181: ...lection of control ROM is abnormal Either ROM or RAM is defective CPU is defective Checkpoint Check pin 2 of IC7A for a changing signal HIGH LOW Check for oscillator signal at either pin 31 or pin 32 of he CPU Solution Replace IC7A Replace either IC6A or IC5A If a signal is detected replace IC5B Other wise replace the CR1 5 16 LQ 510 ...

Page 182: ...C2A is defective IC2B is defective Reference voltage generating circuit is faulty Checkpoint At IC7A check the input waveform at pin 59 and the output signals at pins 60 61 62 and 63 Check input signal and output signal At IC2B check the input signal at pin 5 and the output waveform at pin 1 Check transistors Q30 Q31 and Q35 Solution Replace IC7A Replace IC2A Replace IC2B Replace Q30 Q31 and Q35 L...

Page 183: ...PU cannot measure voltage on the 24 V line IC7A is defective IC1A is defective Checkpoint Measure voltage at VAref pin 42 of IC5B The normal voltage is 4 75 V Check output of the IC1A chip select signal at pin 58 of IC7A At IC1A check HPW input signal pin 31 and printhead drive signal of 1A Solution Replace IC6B Replace IC7A Replace IC1A 5 18 LQ 510 ...

Page 184: ... SAMA Board Unit Repair Cont Cause IC1A is defective A printhead drive tran sistor is defective Checkpoint Check the printhead drive signal at IC1A Check the printhead drive transistor corresponding to the dot Head drive transistor collector Solution Replace IC1A Replace the printhead drive transistor LQ 510 5 19 ...

Page 185: ... transistor paper feed abnormal transistor is motor drive open defective transistor phase Printing in on line node is abnormal Paper feed motor drive transistor collector Paper does Q27 or IC8B Check transistor Q27 not feed or is defective feed pitch is abnormal lack of torque Data IC7A or Check input output signals of IC7A or IC7B corruption IC7B is occurs when defective the parallel interface is...

Page 186: ...e not operate rotates but the defective belt pulley normally at carriage does power on not move The timing belt Check that the timing belt is correctly Reinsert the when the car is defective inserted into the bottom of the carriage timing belt riage has been Check for a broken timing belt Replace the manually timing belt centered prior Carriage moves Carriage Check whether the carriage moves smoot...

Page 187: ...operly check the gap between the tip of the printhead and the gap refer to platen The appropriate value is 0 45 mm Section adjusted 4 3 1 Platen Gap Adjustment Paper feed Printing is Foreign Perform a visual check of the paper path Remove any is defective performed substances foreign but the are lodged substances paper is not in the paper fed or is not path fed 0 Remove uniformly Paper feed Check ...

Page 188: ...n reverse and engages the gear ribbon feed properly only defective mechanism with the car riage moving in one direction i e fails to feed when the carriage moves in the other direction Paper Ink stains Ribbon Check whether the ribbon mask is in the correct Reset the becomes appear on mask is not position ribbon mask stained areas where correctly there is positioned printing Platen gap Set the gap ...

Page 189: ... APPLICATION 6 1 LIST OF FIGURES Figure 6 1 Correct Adhesive Application 6 2 Figure 6 2 GND Spring Lubrication Point 6 2 Figure 6 3 LQ 510 Lubrication Points 6 3 Table 6 1 Lubrication and Adhesive 6 1 Table 6 2 Lubrication Points 6 2 Table 6 3 Adhesive Application Point 6 2 LIST OF TABLES LQ 510 6 i ...

Page 190: ...tion at the points illustrated in Figure 6 3 Table 6 2 provides a list of these points and the recommended lubricant to use for each The lubricants EPSON O 2 EPSON G 20 EPSON G 26 and EPSON G 37 have all been thoroughly tested and fully meet the needs of this printer Table 6 1 lists details of these lubricants Before applying any lubricant make sure that the part to be lubricated is clean Do not a...

Page 191: ...ion gear Paper tension roller shaft Gear portion of the ribbon gear Shaft that holds the ribbon gears Paper feed roller shaft Contact portion of tractor frame L and tractor shaft GND spring on platen shaft Lubricant G 26 G 26 O 2 G 26 G 26 G 26 G 26 G 26 G 26 G 26 G 26 G 37 G 26 G 20 NOTE Lubrication is necessary in the process of assembly Table 6 3 Adhesive Application Point Refer to Figure 6 1 A...

Page 192: ...MAINTENANCE REV A L __ w w n Figure 6 3 LQ 510 Lubrication Points 6 3 LQ 510 ...

Page 193: ...re A 3 OP Code Fetch Timing A 6 Figure A 4 Memory Read Timing A 6 Figure A 5 Memory Write Timing A 6 Figure A 6 E01A05 Pin Diagram A 7 Figure A 7 E01A05 Block Diagram A 9 Figure A 8 HM85256BLSP Pin Diagram A 10 Figure A 9 HM65256BLSP Block Diagram A 10 Figure A 10 SLA7020M Case Outline Drawing A 11 Figure A 11 SLA7020M Functional Equivalent Circuit A 11 Figure A 12 S 29401 Pin Diagram A 12 Figure ...

Page 194: ...A 31 Figure A 35 LQ 510 Printer Cover A Case Outline Drawing A 32 Figure A 36 LQ 510 Printer Cover B Case Outline Drawing A 33 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 10 Table A 11 Table A 12 Table A 13 Table A 14 Table A 15 Table A 16 Table A 17 Table A 18 Table A 19 Table A 20 Table A 21 Table A 22 LIST OF TABLES SAMA Board ICs A 1 µPD781...

Page 195: ...egrated circuits in the LQ 510 A 1 1 SAMA BOARD MAIN COMPONENTS Table A l shows SAMA board ICs Table A 1 SAMA Board ICs Location Name of IC 5B µPD7810HG 7A E01A05 1A E05A02 5A HM65256BLSP 2B SLA7020M 4B S 2940I 6B TL431CLPB 3B 74LS06 8A 8B 74LS07 2A 74LS38 7B 74LS152 Type 15 MHz CPU PSRAM 32 K x 8 bit Stepper motor driver EEPROM Adjustable precision shunt regulator Hex OC inverters Hex OC buffers ...

Page 196: ...nal and 8 internal interrupts 6 priority levels and 6 interrupt addresses 0 General purpose serial interface asynchronous synchronous and l O modes 0 I O line 7811 40 bit I O port 7810 24bit edge detection 4 inputs 0 Zero cross detection 0 Standby function l Built in clock pulse circuit NMOS Figures A 1 and A 2 illustrate the 7810 7811HG microprocessor Tables A 2 through A 5 describe its functions...

Page 197: ... i2r PC7 0 PB7 0 PA7 0 PROGRAM n MEMORY 4K BYTE pPD7811 MAIN I I G R r MNI 0 L INTl 0 L INT DATA MEMORY 256 BYTE1 ALT G R INTERNAL DATA BUS LA t 6 vss D G ...

Page 198: ...APPENDIX REV A Table A 3 µPD7811 PF Operation Table A 4 µPD7810 PF Operation External Memory 256 bytes max 4K max 16K max 60K max A 4 LQ 510 ...

Page 199: ...tage Vss 0V Analog Vss 8 analog inputs of the A D converter AN7 4 can be used as the input terminals to detect the leading edge and to set the test flag upon detection of the trailing edge Reference voltage Analog Vcc Read strobe LOW at the read machine cycle and at reset HIGH at other times 45 WR out Write strobe LOW during the write machine cycle and at reset HIGH at other times 46 ALE out Addre...

Page 200: ...nals is performed at T4 The WR signal is output from the middle of T1 to the beginning of T3 The address and ALE timing is the same as that for memory read however following address output AD7 0 PD7 0 are not disabled and write data is output at AD7 0 at the beginning of T1 and at the end of T3 NOTE When PD7 0 are set to the multiplexed address data bus AD7 0 and PF7 0 to the address bus AB7 0 the...

Page 201: ...r this printer Its functions are as follows 1 Parallel I F 2 Address decoder 3 Bank register 4 Data address multiplexer 5 Reset 6 CR motor control Figure A 6 shows the E01A05 pin diagram Table A 6 shows pin functions for the E01A05 Figure A 6 E01A05 Pin Diagram LQ 510 A 7 ...

Page 202: ...APPENDIX REV A Table A 6 E01A05 Pin Functions A 8 LQ 510 ...

Page 203: ...veloped for 24 pin dot matrix printers and is used to simplify the interface between the CPU and the printhead Figure A 7 shows the E05A02 pin diagram Table A 7 shows the pin functions Figure A 7 E05A02 Pin Diagram Table A 7 E05A02 Pin Functions LQ 510 A 9 ...

Page 204: ...cuits are used and high speed and capacity because a single transistor memory cell is used The pin diagram of the HM65256BLSP is provided in Figure A 8 and a block diagram in Figure A 9 Figure A 8 HM65256BLSP Pin Diagram 1024 sens amp Memory Array I I I I I I I I I I I I I I Figure A 9 HM65256BLSP Block Diagram I O 1 l O2 l O3 I O4 I O 5 I O6 I O 7 I O8 A 10 LQ 510 ...

Page 205: ...s a two circuit 4 phase stepper motor driver for unipolar constant current driving n n ngn n n 1 2 3 4 5 6 7 6 9 10 11 12 13 14 15 Figure A 10 SLA7020M Case Outline Drawing QVCC I D _ I i Figure A 11 SLA7020M Functional Equivalent Circuit LQ 510 A 11 ...

Page 206: ... 0 NC NC GND Figure A 12 S 2940I Pin Diagram vcc GND t 1 MEMORY ARRAY ADDRESS 16x8 DECODER OUTPUT BUFFER t D 0 SK GENERATOR Figure A 13 S 2940I Block Diagram Opcode Table A 8 S 2940I Commands Command Set I Address Data Function 1001 AAAA 0110 AAAA 0000 0000 1111 0000 1100 0000 0011 0000 D0 D7 D0 D7 READ ADDRESS PROGRAM ADDRESS PROGRAM ENABLE PROGRAM DISABLE ERASE ALL ADDRESS PROGRAM ALL ADDRESS A ...

Page 207: ...REV A APPENDIX CEJ S K D I D O Figure A 14 Timing Chart Read Figure A 15 Timing Chart Write LQ 510 A 13 ...

Page 208: ...t is capable of replacing various Zener diodes The TL431 is especially suitable for driving the photodiode in the photocoupler section of the feedback circuit used in the RCC system switching regulator 0 Temperature compensated reference voltage 50 ppm C typical 0 High response speed 0 Low noise r1 I 1 CATHODE LJ ri cl I I ANODE LJ ri I I REF LJ REF NC A NC K SC SC SC Figure A 16 TL431CLPB Pin Dia...

Page 209: ...itry of the TTLs is shown below GND Vcc GND Figure A 18 74LS06 Internal Circuit Figure A 19 74LS07 Internal Circuit 1A 1B 1Y 2A 2B 2Y GND Figure A 20 74LS38 Internal Circuit DATA INPUTS DATA SELECT Figure A 21 74LS152 Internal Circuit LQ 510 A 15 ...

Page 210: ...oard ICs Location IC1 IC20 Name of IC L5431 TL494 Type Adjustable precision shunt regulator Pulse width modulation control 4 1 2 1 TL494 IC20 The TL494 provides pulse width modulation control Its block diagram is shown in Figure A 22 Dead Time Control COMPARATOR PWM COMPARATOR Figure A 22 TL494 Block Diagram A 16 LQ 510 ...

Page 211: ... A APPENDIX A 2 EXPLODED DIAGRAMS AND SCHEMATICS The exploded and schematic diagrams shown in Figures A 23 to A 38 are provided as additional reference Figure A 23 SANPS Board Component Layout LQ 510 A 17 ...

Page 212: ...3 L CN 1 ...

Page 213: ...REV A APPENDIX Figure A 25 SANPSE Board Component Layout LQ 510 A 19 ...

Page 214: ...REV A APPENDIX J Figure A 26 SANPSE Board Circuit Diagram A 20 LQ 510 ...

Page 215: ...REV A APPENDIX Figure A 27 SANPNL W Board Circuit Diagram LQ 510 A 21 ...

Page 216: ... w 3 0 4 CN1 14 18 22 I IP I9 3 1 2LSl39 2 6 8 2 4 9 TOM4 BOARD Y 4 5 4 2 0 9 0 0 0 0 0 ...

Page 217: ...REV A I APPENDIX LISLL 9SZII E II Il ls I d69SZS911H WWM ELI iia SLU 9LU Figure A 29 SAMA Board Component Layout LQ 510 A 23 ...

Page 218: ...APPENDIX REV A 98 3 I CN6 CNS ADJUST LEYERXRELEAY LEVER SAMA Board Y567201000 Y567201100 Japan LQ 510 Figure A 30 SAMA Board Circuit Diagram A 25 ...

Page 219: ... Data Bit 2 13 A I Data Bit 1 14 0 Read Signal 15 w I Data Bit 0 16 A0 0 Address Bit 0 17 18 EZ I Data Bit 3 0 CG ROM Select Signal 19 D6 I Data Bit 6 20 A14 0 Address Bit 14 21 A4 0 Address Bit 4 22 WR 0 Write Signal 23 A7 0 Address Bil 7 24 5 V 5VDC 25 A 1 1 0 Address Bit 11 26 PROG 0 PROM Select Signal 27 A12 0 Address Bit 12 28 A13 0 Address Bit 13 29 Al 0 Address Bit 1 32 A3 0 Address Bit 3 I...

Page 220: ...h i ...

Page 221: ...REV A APPENDIX 506 Figure 14 32 Model 5710 Printer Mechanism Exploded Diagram A 29 ...

Page 222: ...APPENDIX REV A Figure A 33 C80006 Pull Tractor Exploded Diagram A 30 LQ 510 ...

Page 223: ... Y ...

Page 224: ...APPENDIX REV Figure A 35 LQ 510 Printer Cover A Case Outline Drawing A 32 LQ 510 ...

Page 225: ...APPENDIX REV A J 2 7 J Bl Figure A 36 LQ 510 Printer Cover B Case Outline Drawing LQ 510 A 33 ...

Page 226: ...ER TENSION CARRIAGE 805 PAPER HOLDER SHAFT 400 POWER CABLE 220 240 V GUIDE PLATE B 806 PAPER LOADING ROLLER 401 POWER CABLE 240 V 551 PAPER TENSION ROLLER COVER LEFT 402 POWER CABLE 240 V TRANSMISSION GEAR 807 PAPER LOADING ROLLER 403 POWER CABLE 220 V 552 RETAINING RING COVER RIGHT 404 CABLE SET 8E9 553 PAPER TENSION UNIT COVER 808 PAPER HOLDER SPRING 405 CABLE SET 8EB 554 PAPER TENSION SPRING 80...

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