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REV.-A

5.1

5.2

5.3

Fig.

Fig.

Fig.

CHAPTER 5

TROUBLESHOOTING

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

UNIT

UNIT

5.3.1

5.3.2

5-1.

5-2.

5-3.

REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-11

Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-11

Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-14

LIST OF FIGURES

Table 5-1.

Table 5-2.

Table 5-3.

Table 54.

Table 5-5.

Table 5-6.

Table 5-7.

Troubleshooting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

Special Tools for LX-800 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2

Printhead Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . 5-1o

LIST OF TABLES

Special Tools for LX-800 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

List of Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-3

Symptom and Reference Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

Board Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-11

Board Unit Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-14

Printer Mechanism Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-14

Printer Mechanism Unit Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15

5-i

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Summary of Contents for LX-HOO

Page 1: ...LX HOO TECHNICAL MANUAL EPSON ...

Page 2: ...ss written permission is forbidden The contents of this manual are subject to change without notice All efforts have been made to ensure the accuracy of the contents of this manual However should any errors be detected SEIKO EPSON would greatly appreciate being informed of them The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in this manual or their consequences Co...

Page 3: ...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 1 REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTl FIED REPAIR TECHNICIAN 2 MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE LISTED ON THE SERIAL NUMBER RATING...

Page 4: ...hapter 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 assem bly and adjustment Provides Epson approved techniques for troubleshooting Describes preventive maintenance te...

Page 5: ...I REVISION SHEET REVISION I DATE ISSUED CHANGE DOCUMENT 1st issue 1 1 5 8 12 through 18 2 2 11 13 28 30 38 through 42 4 1 13 17 19 5 1 2 6 6 1 A 2 17 18 v ...

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

Page 7: ...5 2 1 5 3 1 5 4 1 5 5 Fig 1 1 Fig 1 2 Fig 1 3 Fig 1 4 Fig 1 5 Fig 1 6 Fig 1 7 Fig 1 8 Fig 1 9 Fig 1 10 Fig 1 11 Printer Mechanism Model 3A10 1 18 ROC Filter Unit 1 19 ROCX Board Unit 1 20 LCPNL Board Unit 1 20 Housing 1 21 LIST OF FIGURES Exterior View of Exterior View of LX 800 1 1 LX 800 with Tractor Unit 1 2 Data Transmission Timing of 8 Bit Parallel Interface 1 3 57 30360 36 Pin Connector 1 3 ...

Page 8: ...LES Table 1 1 LX 800 Options 1 2 Table 1 2 Connector Pin Assignments and Signal Functions 1 4 Table 1 3 Printer Select Deselect DC1 DC3 Control 1 5 Table 1 4 Printer Speed Character Size and Column Width 1 7 Table 1 5 Type of Paper 1 8 Table 1 6 DIP Switch Settings 1 12 Table 1 7 International Character Set 1 13 Table 1 8 DIP Switches Factory Settings 1 13 Table 1 9 Jumper Setting 1 13 I i i ...

Page 9: ... IBM graphics characters Super Subscript Italics and Elite modes can be supported in NLQ Automatic sheet loading function A 3K byte input buffer for improved throughput from the host computer Pull tractor feeding Optional interface for the EPSON 81 XX series Tw models of the LX 800 are manufactured The model for t e U S and Australia uses printer cover A and the model for all countries except the ...

Page 10: ...h Tractor Unit Table 1 1 LX 800 Options I Option No I Description 83 1 0 81 33 8 143 8 145 81 48 8 165 Roll Paper Holder APPLE II Intelligent Interface New Serial Interface RS 232C Current Loop Type 2 InterFace Intelligent Serial Interface Intelligent IEEE 488 Interface 1 2 ...

Page 11: ...PHENOL or equivalent See Figure 1 4 0 5JAS 1 0 5JAS O sus min min min NOTE Transmission time rising and falling time w Fig 1 3 Data Transmission Timing of every input signal must be less than 0 2Ks for 8 Bit Parallel Interface 1 19 GNO Pair with 1 2 20 GNO Pair w tn2 3 Z 1 GNO Pair w th3 4 22 GNO Pair wnh4 5 23 GNO Pair w tn5 6 24 GNO Pair w th6 7 25 GNO Pair witn7 e 2 6 GNO Pair w th S 9 27 GNO P...

Page 12: ...1 BUSY 29 out HIGH indicates printer can not accept next data 12 PE 30 out HIGH indicates paper out This signal is effective only when ERROR signal is LOW 13 SLCT out Always HIGH output Pulled up to 5V through 3 3 K ohms register 14 AUTOFEED XT In If the signal is LOW when the printer is initialized a line feed is automatically performed by input of CR code Auto LF 15 Not used 16 GND Ground for tw...

Page 13: ...hen the BUSY signal is LOW 5 The AUTO FEED XT and SLCT IN signals are valid when they are not fixed to LOW level by the DIP switch or jumper 6 Printing tests including those of the interface circuits can be performed without using external equipment set interface connector data lines 1 8 to the desired code a floating signal will be a logical 1 and a grounded signal will be a O connect the ACKNLG ...

Page 14: ... matrix 9 wires see Figure 1 5 0 29 mm 0 35 mm 1 72 inch 1 2 3 4 5 6 7 8 9 i 0 29mm t 0 35mm 1 72 t Fig 1 5 Printhead Pin Configuration Bi directional with logic seeking Uni directional left to right 9 X 9 Draft 11 X 18 NQL 6 X 8 Graphics 96 ASCII characters 96 Italic characters 32 International characters 32 International Italic characters 32 Graphics characters 96 IBM Graphics characters Draft N...

Page 15: ...80 10 Pica o 75 4 2 3 1 40 5 0 75 2 1 3 1 80 10 0 0 37 4 2 3 1 40 5 o 128 1 05 3 1 132 17 0 o 64 2 1 3 1 66 8 5 Draft o 180 2 1 3 1 96 12 Elite o 90 4 2 3 1 48 6 o 150 1 05 3 1 160 20 NLQ o 25 Super sub 0 1 6 script Line spacing 1 6 or Programmable n 2 16 Line feed speed Approx 95ms line Line feed 1 line 1 6 Approx 75ms line Form feed Paper feed method Friction feed or Tractor feed Paper path From...

Page 16: ...t 52g m2 to 82g m2 1 sheet 52g m2 to 64g m2 52g m2 to 82g m2 2 sheets 35g m2 to 58g m2 3 sheets 35g m2 to 58g m2 for 2 sheets 35g m2 to 47g m2 for 1 sheet Feeding method Friction feed Tractor feed Friction feed Precautions 1 Do not use continuous 1 Release the friction 1 Use the Roll paper form or copy paper mechanism using the holder 2 Dismount the Tractor release lever 2 Dismount the Tractor uni...

Page 17: ... mor m F r i n t a b t e a r e a 3 7 1 5 8 50 182 mm 216 mm I Printable area I I I mm T ABC T XYZ L ABC J XYZ lm Fig 1 6 Printable Area for Cut Sheet Paper 0 1 2 3 mm or more 0 98 25 mm or more 8 5 216 mm Printable area ABC XYZ 0 1 2 3 mm more 0 1 2 3 mm or more Fig 1 7 Printable Area for Roll Paper 1 9 ...

Page 18: ... width is more than 9 5 241 mm Fig 1 8 Printable Area for Fan Fold Paper Ribbon Cartridge Cartridge number 8 7 5 0 Color Black Life 3 million characters 14 dots character Electrical Specifications Power Voltage Frequency range Power consumption Insulating resistance Dielectric strength 120VAC 10 220 240VAC 10 59 5Hz to 60 5Hz 120VAC 49 5Hz to 60 5Hz 220 240VAC Max 70VA More than 10M ohms between t...

Page 19: ...o vibration 0 50G max 55Hz Storage 0 25G max 55Hz Operating Reliability MCBF MTBF Life of printhead Safety Approvals safety Standards RFI Physical Dimensions Refer to Figure A 19 Weight 3 million lines Printer mechanism except the printhead 4000 hours 200 million strokes needle UL 478 U S A CSA 22 2 No 0 154 Canada VDE 0806 West Germany FCC class B U S A VDE 0871 West Germany 91 mm height 377 mm w...

Page 20: ...d only when at power on or at input of the INIT signal Table 1 6 DIP Switch Settings DIP SW Function ON OFF 1 1 Typeface select Condensed Normal 1 2 ZERO font select 0 0 1 3 Character Table select I Graphic I Italic 1 4 I Paper out detection I Valid I invalid 1 5 I Printing quality select I NLQ I Draft 1 6 1 7 International character set select See Table 1 7 1 8 2 1 Page length select 12 1 1 2 2 C...

Page 21: ... 2 4 Country U S A Southeast Asia OFF OFF OFF OFF OFF ON ON ON OFF OFF OFF OFF Middle and Near East Germany OFF OFF OFF OFF OFF ON OFF ON ON OFF OFF OFF Northern Europe U K Australia OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF France Italy Spain OFF OFF ON OFF OFF ON ON ON OFF OFF OFF OFF Jumper J 1 on the ROCX board has the function and factory setting shown in Table 1 9 Table 1 9 Jumper Setti...

Page 22: ...ON LINE ON OFF LINE Switch non locking push switch Switches between the ON LINE and OFF LINE modes The printer is automatically set ON LINE and becomes ready when power is turned on If the printer is set OFF LINE printing is stopped and the printer enters the busy state NLQ FORM FEED Switch non locking push switch When this switch is pressed once in the OFF LINE mode the paper is advanced vertical...

Page 23: ...de or NLQ mode urn the power on while pressing the DRAFT LINE FEED or NLQ FORM FEED switch respectively In the NLQ self test mode both Roman font and Saris serif font are printed every other line When the DIP switch 1 5 set to on NLQ mode only NLQ mode self test is performed no related switches To stop the self test turn the power off by power switch The conditions of data transmission between LX ...

Page 24: ...on flow chart of SelecType function ENTER Hold down ON OFF LINE SW and press NLQ FORM FEED SW Print er beeps once and ON LINE LED starts blinking I Select the type style I Press ON OFF LINE SW the number of times indicat ed below for the mode Pay attention to the number of beeps the printer makes when the buzzer sounds 1 Emphasized 3 Condensed I 2 I Double striked I 4 I Elite I I Set type style Pr...

Page 25: ...ach with 0 5 sec pause between rings When the paper end sensor detects paper out the state of the interface changes as follows ERROR signal LOW BUSY signal HIGH PE signal HIGH The printer enters an error state when any of the following occurs a Home position is not detected after the printer mechanism has been initialized home seek position b The 24V voltage which is used to drive the printhead an...

Page 26: ...he Model 3A10 printer mechanism was developed expressly for use with LX 800 printer the components include a carriage motor carriage mechanism paper feed motor paper feed mechanism ribbon feed mechanism printhead sensors and the tractor unit For the tractor unit there are two tabs on both side frames to allow the printer cover to float slightly when tractor feeding is performed Fig 1 11 Model 3A10...

Page 27: ... The ROC filter unit contains a power cord 120 V version or AC inlet 220 240 V version power switch fuse filter circuit and power transformer Fig 1 12 ROC Filter Unit 120V version Fig 1 13 ROC Filter Unit 220 V 240V versions 1 19 ...

Page 28: ...gulator circuit The main ICS on the ROCX boards are the pPD78 10HG CPU and the E05A03 gate array which controls everything Y Fig 1 14 ROCX Board Unit 1 5 4 LCPNL Board Unit The LCPNL board unit is a control panel of LX 800 which contains the indicator LEDs switches and buzzer Fig 1 15 LCPNL Board Unit 1 20 ...

Page 29: ... A 1 5 5 Housing The housing is comprised of the upper and lower cases and paper feed knob which accommodate the printer mechanism ROCX board unit LCPNL board unit and ROC filter unit Fig 1 16 Housing 1 21 ...

Page 30: ...Gate Array Functions 2 14 2 4 3 Data Flow 2 18 2 4 3 1 Initialization 2 19 2 4 3 2 Print Data Processing 2 20 2 4 4 Reset Circuit 2 22 2 4 5 Carriage Motor 2 23 2 4 5 1 Home Position Sensor 2 23 2 4 5 2 Carriage Motor Control 2 24 2 4 5 3 Home Position Seek 2 26 2 4 5 4 Carriage Motor Drive Circuit 2 27 2 4 6 Paper Feed Motor 2 27 2 4 6 1 2 4 6 3 2 4 6 3 2 4 6 4 Paper End Sensor 2 29 Paper Feed Mo...

Page 31: ... 5V DC Regulator and 12V Half Wave Rectifier Circuits 2 5 Fig 2 6 Chopper Switching Regulator Circuit 2 6 Fig 2 7 Voltage Waveforms 2 6 Fig 2 8 24V Supply Circuit 2 7 Fig 2 9 IC494 Block Diagram and Switching Waveform 2 7 Fig 2 10 Fig 2 11 Fig 2 12 Fig 2 13 Fig 2 14 Fig 2 15 Fig 2 16 Fig 2 17 Fig 2 18 Fig 2 19 Fig 2 20 Fig 2 21 Fig 2 22 Fig 2 23 5V Supply Circuit 2 8 Control Cirucit Block Diagram ...

Page 32: ... Voltage Waveforms 2 34 Fig 2 34 The Relationship Between the Carriage and Control Signals 2 35 Fig 2 35 Logic Seeking 2 36 Fig 2 36 Printer Mechanism External View Model 3A10 2 37 Fig 2 37 Carriage Mechanism 2 38 Fig 2 38 Printhead Printing Operation 2 39 Fig 2 39 Friction Feed Operation 2 40 Fig 2 40 Sprocket Feed Operation 2 41 Fig 2 41 Ribbon Feed Mechanism 2 42 LIST OF TABLES Table 2 1 Voltag...

Page 33: ...he control circuit section and the operation of the hardware and the printer mechanism Please note that the following units are assumed when omitted in this chapter Resistor Units are Ohms Capacitor Units are Farads The components listed below are referred to as follows ROCX board Main board LCPNL board Control panel Model 3Al O Printer mechanism 2 1 ...

Page 34: ...ections The ROCX board connectors are as follows CN 1 CN2 CN3 CN4 CN5 CN6 CN7 CN8 8 bit parallel interface connector Used for data communication with the host computer Connector for the 8 100 series optional interface Receives data from the LCPNL board switches and outputs the signals to the LEDs and the buzzer Outputs data to the printhead Outputs the control signals and drive voltages to the pap...

Page 35: ...t I 0 GND I I I I O 12VAC I I I O 12VAC k A ROCX Board Fig 2 2 Power Supply Circuit Block Diagram Table 2 1 Voltage Types and Applications Power Voltage Application 24 VDC GP Printhead common voltage Paper feed motor drive voltage Carriage motor drive voltage Optional interface board 5 VDC GND Logic circuit Paper feed motor hold voltage Carriage motor hold voltage Control panel power Optional inte...

Page 36: ...V or 250 V 1 25 A 220 V version 250 V 0 63A 240 V version 250 V 0 63A Power F1 Switch r To pin of 0 Power Transformer c l L1 29 H 2200PF C3 AC IN x2 0 1 IF C2 To pin of 0 Power Transformer Fig 2 3 Filter Circuit 2 3 1 2 Power Transformer Three types of power transformers for 240 V 220 V and 120 V are available The AC voltage from the filter circuit is transformed to the voltages listed in Table 2 ...

Page 37: ...tor Circuit AC tind AC2 output from the ROC filter unit are input to connector CN8 of the ROCX board The regulator circuit can be divided mainly into two portions the 24 V 5 V and 12 V lines AC 1 is full wave rectified by diode bridge DB 1 and converted to 24 V and 5 V via the chopper type switching regulator AC2 is half wave rectified by D4 C 10 converted to 12 V and input to the optional interfa...

Page 38: ...stor St is on current Is is supplied to inductor L in proportion to time s vi L Vo t When energy has accumulated in the inductor L current 10 is supplied to the load When St is off the energy accumulated in L causes I D Ip t current ID to flow via diode D and to supply load current 10 The longer the on time of St the more the output voltage increases and the shorter the on time of St the more the ...

Page 39: ...C22 becomes 32 3 VDC Transistors Q23 Q24 and Q25 which are used as Darlington amplifiers D7 L2 and C26 in Figure 2 8 are equivalent to switching transistor St flywheel diode D choke coil L and smoothing capacitor C in Figure 2 6 Switching is controlled by the 494 IC3A and pin 9 of the 494 is the emitter of the internal switching transistor Therefore switching is performed as follows 494 internal t...

Page 40: ... 3 1 amps 2 3 2 3 5 V Supply Circuit The 5 V supply circuit is also a chopper type switching regulator which is the same as the 24 V supply circuit L1 24V GP Q21 C9 P201 2R5SD o C3746 470P Q20 Al O 15 RI 4 D1 2 0 2 K S R I ERB81 R12 1 78L05A 0 0 4 33 R1 1 1 Vvv I 2 0 330 G 13 B7 1 Ov R13 0 1 ZBF503 2 C8 01 TA o A T Q GND 77 7 Fig 2 10 5 V Supply Circuit When 24 V is applied to this circuit current...

Page 41: ...n 2 4 2 3 Outline of the overall firmware operation Section 2 4 3 4 Software control and circuit operation of the analog circuits Sections 2 4 4 through 2 4 8 The control circuit is very simple and consists mainly of four chips the CPU gate array ROM and RAM Refer to Figure 2 1 1 The main operation of the control circuit is to control the CPU and the gate array Other components are described in ea...

Page 42: ... MOTOR CARRIAGE MOTOR HOME PRINT HEAD I I I A G A E 0 5 A 0 3 B A Ill I I l l mho ho r m m G m m mmoo u 4 f u Fig 2 11 Control Circuit HOST COMPUTER OPTIONAL Fig 2 11 Control Circuit Block 2 1o IIF BOARD Diagram 1 Block Diagram ...

Page 43: ...PA7 PBO PB7 Pco I I o I TXD output port Outputs the data from the serial 1 0 channel in the CPU to the TXD transmit data to the host computer terminal of the optional interface Pcl RXD RXD input port Used as a receive control signal when the optional serial interface board for serial parallel data conver sion is connected Data reception detection ONLINE LP PC2 o 1 0 port Controls the ON LINE LED o...

Page 44: ...D converter in the CPU 34 ANO SW2 1 Analog input port of the 8 bit A D converter in the CPU Reads 1 i I 1 the states of DIP SW2 1 through SW2 3 36 AN2 SW2 3 37 AN3 I SW2 4 Analog input port of the 8 bit A D converter in the CPU Reads the state of DIP SW2 4 This signal line is connected to the AUTO FEED XT signal line of the interface When DIP SW2 4 is ON the automatic paper feed function is valid ...

Page 45: ...ignal is HIGH 8 bit 1 0 ports with output latch Used as the upper address bus according to the MODE 0 1 terminal selection For 64K external memory assignment Al 3 through Al 5 are input to the address decoder in the gate array Multiplexed addressldata bus Used as the lower address and data bus Power supply for the internal RAM 5 VDC Power supply for the CPU 5 VDC When this voltage is not stable su...

Page 46: ...ons Figure 2 12 shows the E05A03 block diagram 3 STROBE I NO 7 DBO 7 ALE DB6 DB7 T RESET RESI AB15 AM4 AB13 TIMING REGISTER LATCH Input Data I I I 1 A 1 I I I I I I 11 l l I I III L PRINTHEAD DRIVER IATCH ControIl w CARRIAGE MOTOR DRIVER BUSY RESO Fig 2 12 E05A03 Block Diagram 2 14 ...

Page 47: ...USY signal controlled by the firmware 4 Printhead solenoid drive pulse When the FIRE signal from the CPU is brought Low the data that was previously latched is output on HD 1 HD9 to drive the corresponding solenoids in the printhead When FIRE is high HDI HD9 are all low 5 Shift register This gate array includes a shift register 8bits X 3 and the MSB Most Significant Bit can be read by accessing th...

Page 48: ...t register and shifts the data one bit to the left MSB DB7 Bit 7 1 The BUSY signal is output at the leading edge of STROBE O The BUSY signal is output at the trailing edge of BUSY STROBE Bit 6 1 Resets software BUSY 03H O Sets software BUSY w NLQLP Bit 4 1 NLQLP is LOW See NOTES 2 0 NLQLP is HIGH CNDLP Bit 3 1 CNDL is LOW See NOTES 2 0 CNDL is HIGH PE Bit 2 1 PE is HIGH and PELP LOW PELP O PE is L...

Page 49: ...ignal Home Not home 24 RESI In Reset signal input 25 RESO out Reset signal output 26 PF A out Paper feed PF motor phase A drive pulse 27 PF B out PF motor phase B drive pulse 28 PF C out PF motor phase C drive pulse 29 PF D out PF motor phase D drive pulse 30 Cs 1 out Chip select 1 lower address 31 Cs 2 out Chip select 2 upper address See NOTES 1 32 33 GND GND 34 CND LP out CONDENSED lamp on off S...

Page 50: ...k Area RAM IC4CI 8k bytes Program Area ROM IC3C 32k byles Figure 2 13 shows a memory map of the Stack Area Lim Buffer I hag Buff 2K bytes l hut Oata Buffer I l i3k bvtes I Fig 2 13 LX 800 Memory Map The CPU can access an external memory of 64K bytes and executes the program 32K bytes in the external ROM IC3C The external RAM IC4C area 8K bytes and the CPU internal RAM 256 bytes are used as a buffe...

Page 51: ...rray I Initialized the instruction codes are set i Outputs the instructions to the gate array I 1 I i I Reads the DIP switch settings on the optional in I Reads the DIP switch settings on the optional in terface board upon receiving the instruction code terface board if the board is installed XX02H is read 1 I J Checks whether the paper is set or not Sends the Controls the paper end signal of the ...

Page 52: ...e The print data is processed by repeating the main and interrupt routines Array CPU Data D ACK Input Data 5 m STRB D Buffer 2 t BUSY A J Command Analyze Add the 9 4 Attribute M a i n routi e Interrupt ro tine 7 fiA CG 6 Down I Load r e CG Copy Araa FIRE P Imaga Buffer I I o Printing Fig 2 15 Print Data Flow The data flow in the Draft printing mode is as follows Step numbers used in the explanatio...

Page 53: ...d flags indicate what kind of command or mode is specified for the character According to the command flags any of the EPSON ESC P commands NLQ underline emphasized character and font selection is specified for the character When either the CPU detects a printing command CR or the line buffer becomes full the printing process interrupt routine is started The CPU transfers the character codes from ...

Page 54: ... 5 V and 24 V reset circuit When the printer power is turned on the level of the RESI signal is held at its threshold level or below LOW level until the voltage of the 24 V line reaches the Zener voltage of ZD2 when the power is turned off the sequence reverses The same sequence is followed for the 5 V line The level of the RESI signal is held at its threshold level or below LOW level until the vo...

Page 55: ... PPS Unipolar drive 1 1 phase excitation system 450 PPS 24 VDC 41 5 ohms A7Y0 The home position sensor detects the reference position of the carriage The sensor is located at the home position which is to the left of the first column Figure 2 18 shows the home position sensor circuit 5 R 20 CN7 5 6K I w HOME 1 r 1 I Home Position i i I Sensor 1 I 1 L_ d 2 Fig 2 18 Home R32 L3 IK E05A03 3B Position...

Page 56: ...a phase which is determined by the firmware for the number of counts determined by the firmware Figure 2 19 shows the basic phase switching patterns CRA CRB CRC CRD Carriage Movement Left ight Left Direction ight 2 2 Phase Switching l 1 Phase Switching Fig 2 19 Basic Phase Switching Patterns Constant Speed 1 I speed H P I v I Rt I I I I I I I Rt I I I A I C H P S Printing A 11 START II I I Area q ...

Page 57: ...is switched and a carriage error occurs if the home position signal goes HIGH Ccmstant speed mode After acceleration completes the carriage motor enters the constant speed mode Printing is started when the carriage motor enters this mode The time period for each step is the same 2 22 ms at 450 PPS and 1 11 ms at 900 PPS Deceleration mode The deceleration mode consists of a maximum of 12 steps The ...

Page 58: ...0 ms until it reaches the home position I I Fig 2 21 Home Position Seek Operation Flow A home position seek is performed when the hardware is initialized Because the carriage control is an open loop system the CPU must perform a home position seek in order to get the carriage to a known reference position This operation is performed at 450 PPS l 1 phase drive The printing start position column 1 i...

Page 59: ... voltage is applied to the coil of the motor When PAO of the CPU is HIGH the 24 V is applied to CRCOM drive mode When it is LOW 5 V is applied to CRCOM holding mode 2 4 6 Paper Feed Motor This section describes the sensor circuit an outline of the firmware and the drive circuit which are used to control the paper feed motor The specifications of the paper feed motor are as follows Angle per step 7...

Page 60: ...tected during printing firmware stops printing and sets the printer OFF LINE When a paper end is detected during initialization firmware sets the printer OFF LINE When the AUTO LOAD switch is pressed in the OFF LINE state Firmware executes the auto loading function refer to Section 2 4 6 3 if paper is not already loaded or executes paper feeding normally one line when the paper is loaded If the pa...

Page 61: ...and the phase switching is performed according to the phase pattern stored in the firmware Figure 2 25 shows the basic phase switching pattern PFA PFB PFC PFD Platen Movement B a c k _ Normal Direction Fig 2 25 Phase Switching Basic Pattern Constant Speed I 1 I Speed 1 Power ON 1 1 STOP I r 1 I I I Rtl 1 1 I I Rt2 I I 1 I 1 1 8 I Drive vuvu Hold Fig 2 26 Basic Operation Sequence 2 29 ...

Page 62: ...nd the phase switching time for each step becomes longer as the step number increments Rt2 When the paper feed motor decelerates and stops it enters the holding mode after the rush time of 15 ms The paper is fed 1 6 inch 4 23 mm per 36 steps When the total number of steps is 10 or less the paper feed motor is driven only in the constant speed mode but with a step time of 3 28 ms The phase switchin...

Page 63: ...A03 PFA PFB PFC PFD 3B CPU PA2 CN5 A 12 al 7 I Q16 8 11 7 3 3K X 4 77 7 D1 8 4 3 x 4 2 4 5 J JL RI 3 3K 3 4 5 3 lC 5 6K Q18 B1 093 J R17 33 D3 9 10 2B I EMOIZW Fig 2 28 Paper Feed Motor Drive Circuit The paper feed motor drive circuit is a constant voltage switching circuit unipolar drive which is the same as the carriage motor drive circuit When output port PF of the E05A03 is HIGH voltage is app...

Page 64: ...ually for underlining is latched by HD9 of the E05A03 via DB7 After latching the data the printhead drive pulse width signal FIRE is output from the event counter in the CPU While the FIRE signal is LOW the gate opens so that the data at HD 1 through HD9 is output The timing of the event counter in the CPU is set mechanically The data write operation is completed within one cycle of the counter Th...

Page 65: ... 350 I I I I I I wYz z I I I 1 I II I I I I I I 345 325 I I I 1 I I I 300 I I I 1 21 6 24 26 4 Printhead Driving Voltage V Fig 2 30 Printhead Drive Pulse Width Range 24V R36 2 2K l 2W VAref 4 2 4 5 2 4 t s W o AVCC 43 I 7 Fig 2 31 24 VDC Monitor Circuit The CPU monitors the 24 V line at AN5 of the 8 bit analog to digital converter computes the result and controls the drive pulse width of the signa...

Page 66: ...r Voltage Waveform approx 360Ps Fig 2 33 B approx 40ps C approx 1 11 ms Solenoid Current and Drive Voltage Waveforms 2 4 8 Print Timing Control This section describes the print timing control for the carriage and printhead and the bidirectional logic seeking function 2 4 8 1 Print Timing Control for the Carriage and Printhead The phase switching of the carriage motor and the printhead driving are ...

Page 67: ...ng overloaded Printing for one line is performed in the sequence described above In the NLQ mode half of the dot pattern is printed for one line the paper is fed for 1 216 inch and the remaining half of the dot pattern is printed In the half speed mode valid when the printing speed is 900 PPS the printhead drive pulse width is doubled 720 Ps and the carriage drive speed is halved 450 PPS 2 4 8 2 B...

Page 68: ...ing of the 3 rd line Fig 2 35 Logic Seeking Upon receive in print data EPSON for a line from the host computer the printing is performed in an action of to with the carriage and printhead moving to position Q The CPU receiving the next data from the host computer analyzes it and determines the acceleration start position of the carriage In an action of to the carriage is moved to position here pap...

Page 69: ...e home position sensor functions to determine the home position of the carriage and sends a reference signal for print start position The home position sensor mechanism consists of the mechanical switch which is operated by lever at the bottom of the frame When the detection pIate pushes the lever of sensor the mechanical switch closes Paper End Sensor The paper end sensor detects the presence abs...

Page 70: ...arriage mechanism The timing belt is connected into the bottom of the carriage This 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 Left v z Carriage Guide Shaft Driving Pulley Fig 2 37 Carriage Mechanism 2 38 ...

Page 71: ...d driving coil is deenergized the actuating plate returns to the initial position as a result of the action of the actuating plate spring After striking the platen the dot wire also returns to its initial position as a result of impact energy and from the wire resetting spring and the dot wire is held in engagement with the actuating plate until it is driven again Fig 2 38 shows the printhead prin...

Page 72: ... At this time the paper feed motor is driven to rotate the platen gear via the paper feed reduction gear in the direction shown in Figure 2 39 The rotation of the platen Gear feeds the paper in the direction of the arrow due to 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 shif...

Page 73: ...iven to rotate the gears via the pinion on the shaft of the motor in the direction shown in Figure 2 40 Rotating the gears rotates the sprocket wheels which advances the paper in the direction shown by the arrow For the sprocket feed method the pressure of the paper feed rollers against the platen is released by shifting the release lever forward ar Motor Fig 2 40 Sprocket Feed Operation 2 41 ...

Page 74: ...anet gear 1 Planet gear 3 Planet gear 4 Ribbon driving gear Figure 2 41 shows ribbon feed mechanism The inked ribbon is inside the cartridge case in an endless state held between the ribbon feed and ribbon pressure roller mounted on the ribbon driving gear The rollers are driven by the movement of the gear and the inked ribbon is fed A ribbon breaking spring is attached at the exit of the cartridg...

Page 75: ...REV A CHAPTER 3 OPTIONAL EQUIPMENT 3 1 GENERAL 3 1 3 2 OPTIONAL INTERFACES 3 1 LIST OF TABLES Table 3 1 Optional Interfaces 3 1 3 i ...

Page 76: ...s Current Loop Control BPS 8 143 None o 0 19200 8145 2K o x 9600 8148 2K 8K o 0 19200 IEEE 488 Buffer Size Function Listen Only Address G P IB Operation Operation 8165 2K 8K AH L DC o 0 Special Application Interface 8133W APPLE 11 using 8K byte ROM o Available x Not available When the 8 143 is used in LX 800 serial parallel conversion is available only following conditions Baud rate 75 to 9600 bps...

Page 77: ...al of Printer Mechansim 4 7 4 2 4 1 Removal of Platen Unit and Paper Guide 4 7 4 2 4 2 Removal of Printer Mechanism 4 8 4 2 5 Disassembly of Printer Mechanism 4 9 4 2 5 1 4 2 5 2 4 2 5 3 4 2 5 4 4 2 5 6 4 2 5 6 4 2 5 7 4 2 5 8 4 2 5 9 Paper Feed Mechanism Removal 4 9 Removal of Paper Feed Motor 4 12 Removal of Paper End Sensor 4 12 Disassembly of Platen Unit 4 13 Removal of Carriage Unit 4 13 Remo...

Page 78: ...er Feed Roller Shaft 4 1o Removal of Paper Guide Plate and Spacer 4 10 Paper Guide Plate and Spacer Assembly Points 4 11 Paper Release Lever and Paper Guide Plate Release Lever Assembling Point 4 11 Removal of Paper Feed Motor 4 12 Removal of Paper End Sensor 4 12 Platen Unit Assembling Point 4 13 Printer Mechanism Bottom View 4 13 Removal of Carriage Guide Shaft Ground Plate 4 14 Removal of Carri...

Page 79: ...REV A LIST OF TABLES Table 4 1 Repair Tools 4 1 Table 4 2 Measuring Instruments 4 1 Table 4 3 Abbreviations List of Small Parts 4 2 Table 44 Form and Abbreviated Part Name of Screw 4 2 4 iii ...

Page 80: ...ling and repairing the printers Table 4 1 Repair Tools Description Brush No 1 Brush No 2 Cleaning Brush Round nose pliers Diagonal cutting nipper Tweezers Electric soldering iron E ring holder 2 5 E ring holder 5 Phillips screwdriver No 2 Screwdriver No O Thickness gauge 0 47 mm Type o 0 0 0 0 0 0 0 0 0 Part No B74 1400200 B74 1400100 B74 1600100 B7404OO1OO B7405OO1OO B64 1000100 B740200 100 B7408...

Page 81: ... CTB Cross recessed head Tapping screw Bind CTB P C T B screw with Plain washer CTBS 0 C T B S tight screw with Outside toothed lock washer CTPS 0 C T P S tight screw with Outside toothed lock washer CTPS P C T P S tight with Plain washer Table 4 4 describes the relationship between the form and the abbreviated part name of screw Table 4 4 Form and Abbreviated Part Name of Screw Heed Body Washer b...

Page 82: ...n cartridge before disassembly The disassembly sequence of this section is grouped into five parts 1 removal of printhead 2 removal of cases 3 removal of the electric circuits boards 4 removal of printer mechanism unit and 5 disassembly of printer mechanism Ref to Figures A 16 through A 18 the LX 800 exploded diagrams and the printer mechanism exploded diagram 4 2 1 Removal of Printhead Figure 4 1...

Page 83: ...andard screwdriver into the two holes at the front of the lower case unlock the notches then lift the upper case Upper Case Guide y The notch can be unlocked by pushing it in the direction shown by the arrow using the screwdriver Case Notch Fig 4 2 Upper Case Removal 1 While lifting the upper case disconnect the FPC of the control panel LCPNL from connector CN3 on the ROCX board and remove the upp...

Page 84: ...the control panel with the FPC guide of the upper case 7 c Guide Fig 44 Control Panel Removal 4 2 3 Removal of Electric Circuit Boards This section describes the ROCX board and ROC filter unit removal 4 2 3 1 ROCX Board Removal 1 Remove the upper case Refer to Section 4 2 2 1 2 Disconnect connectors CN5 CN4 CN6 CN7 and CN8 on the ROCX board which connect each component to the ROCX board WARNING Wh...

Page 85: ... ROCX board WARNING When removing the ROCX board from the lower case do not bend the tabs too far Be careful when pushing the tabs so as not to break them or damage the components on the ROCX board 4 2 3 2 ROC Filter Unit Removal Figure 4 6 1 Remove the upper case Refer to Section 4 2 2 1 2 Disconnect the cable connecting the ROC filter unit to the ROCX board from connector CN8 on the ROCX board F...

Page 86: ...l Before removing the printer mechanism remove the platen unit and the paper guide so that the printer mechanism can be removed quickly and easily Fig 4 7 Printer Mechanism Removal 4 2 4 1 Removal of Platen Unit and Paper Guide Figures 4 8 through 4 9 1 Remove the upper case Refer to Section 4 2 1 1 2 Turn the shaft holders at the left and right sides of the platen unit as shown in Figure 4 8 and ...

Page 87: ...he following adjustment 4 3 1 Platen Gap Adjustment 4 2 4 2 Removal of Printer Mechanism Figure 4 10 1 2 3 Remove the platen unit and the paper guide Refer to Section 4 2 4 1 Disconnect the cables from connectors CN5 CN4 and CN7 on the ROCX board Refer to Figure 4 5 Loosen the six tabs of the lower case which secure the printer mechanism to the lower case by pushing them with a screwdriver The pri...

Page 88: ...he Printer Mechanism Exploded Diagram and Table A 16 Component Name List 4 2 5 1 Paper Feed Mechanism Removal Figures 4 11 through 4 16 1 Remove the printer mechanism Refer to Section 4 2 4 2 Push the notch of the paper guide plate release lever and pull the paper guide release lever and the paper guide release shaft to remove them per Guide Plate Frame Left Sid lease Shaft Paper Guide Plate Relea...

Page 89: ... to remove it Frame Fig 4 13 Removal of Paper Feed Roller Shaft 5 Loosen the four tabs securing the paper guide plate and the paper guide plate spacer to the frame using a screwdriver and lift them to remove them Push the tabs out from the frame Fig 4 14 Removal of Paper Guide Plate and Spacer 4 1o ...

Page 90: ...release lever and the paper guide plate release lever carefully observe the mounting positions shown in Figure 4 16 Paper Release Lever Paper Guide Plate Release Lever Paper Guide Plate Release Shaft B Viewed from left side of Printer Mechanism Fig 4 16 Paper Release Lever and Paper Guide Plate Release Lever Assembling Point The paper release lever and the paper guide plate release lever must be j...

Page 91: ...e direction shown by the arrow below using point A as a fulcrum I Paper Feed Viewed from upward Motor Viewed from left side Fig 4 17 Removal of Paper Feed Motor 4 2 5 3 Removal of Paper End Sensor Figure 4 18 1 2 Remove the platen unit and paper guide Refer to Section 4 2 4 1 Loosen the tab securing the paper end sensor to the paper guide remove the paper end sensor by turning it in the direction ...

Page 92: ... flat spring and the shaft holder correctly and insure that the gap between the platen and the platen gear is adequate Flat Spring Platen Platen Gear Fig 4 19 Platen Unit Assembling Point 4 2 5 5 Removal of Carriage Unit Figures 4 20 through 4 24 1 2 3 Remove the printer mechanism Refer to Section 4 2 4 Remove the printhead and disconnect the head cable Turn the printer mechanism over and manually...

Page 93: ...the Carriaga Guide Shaft Ground frame through the cutout at 18 A Plata 74 orFrame Fig 4 21 Removal of Carriage Guide Shaft Ground Plate 6 Place the printer mechanism face up Turn the left carriage guide shaft lever fully counterclockwise and pull it out through cutout A Then turn the right carriage guide shaft lever fully clockwise and pull it out the same way as the left lever Frame A Carriage Gu...

Page 94: ...ft and the head adjust lever position them as shown in Figure 4 24 v Head Adjust Lever D cut Carriage Guide Shaft Fig 4 24 Carriage Guide Shaft and Head Adjust Lever 2 The colors of the left and right carriage guide shaft lever are gray and black respectively The hole in each lever must slide onto the corresponding end of the shaft 3 When connecting the head cable pass it correctly through the FPC...

Page 95: ...rriage motor frame i Tab Tab Fig 4 25 Carriage Motor Frame Removal 4 5 a screwdriver Remove the belt tension spring from ring on the carriage motor side then holder belt pulley and timing belt the carriage motor frame Remove the E type 3 2 retaining remove the plain washer belt pulley flange belt pulley shaft 3 Retaining Ring E type 3 2 Plain Washer e Belt Pulley Frange v o Belt Pulley Shaft Holde...

Page 96: ...position sensor and remove the home position sensor from the carriage motor frame Fig 4 27 Removal of Home Position Sensor 4 2 5 8 Disassembly of Ribbon Feed Mechanism Figure 4 28 1 2 3 Remove the printer mechanism Refer to section 4 2 4 Turn the printer mechanism over and loosen the four bent tabs of the ribbon gear cover using a screwdriver At this time just loosen the tabs slightly but do not r...

Page 97: ...ng Plate R Side Cover R Transmission Gear Fig 4 29 Removal of Side Cover Remove the sprocket gear and the sprocket transmission gear Remove the shaft holder Refer to Figure 4 8 The left and right shaft holders can be removed at the same time Remove the sprocket shaft from the sprocket mounting plate Loosen the sprocket mounting plate tab using a screwdriver and pull out the sprocket guide shaft Sp...

Page 98: ...ft from the side with the T shaped notch Sprocket Shaft o paper Guide Roller Fig 4 31 Paper Guide Roller Remova and Attaching ASSEMBLY POINTS 1 2 Attach the paper guide roller to the sprocket shaft from the direction indicated in Figure 4 31 Attach the sprocket wheel to the sprocket shaft so that the sprocket wheel marks are on the left side and so that the marks on the two wheels line up Sprocket...

Page 99: ...oving the ribbon mask pull it frontward slightly then lift it G Ribbon Mask Carriage Fig 4 33 Removal of Ribbon Mask 4 Reinstall the printhead 5 Set the head adjust lever at the nearest position to the platen 6 Manually move the carriage to the paper end sensor lever position column 10 7 Insert a thickness gauge 0 47 mm between the platen and the printhead and adjust the left and right carriage gu...

Page 100: ...se The platen gap widens Turned counterclockwise The platen gap narrows Carriage guide shaft right Turned clockwise The platen gap narrows Turned counterclockwise The platen gap widens Perform the above adjustment at the 10th and 70th column positions and at the middle of the platen When the gaps at all three positions match the adjustment is complete v la Fig 4 36 Platen Gap Adjustment Positions ...

Page 101: ...GURES Table 5 1 Table 5 2 Table 5 3 Table 54 Table 5 5 Table 5 6 Table 5 7 Troubleshooting Procedure 5 1 Special Tools for LX 800 5 2 Printhead Resistance 5 1o LIST OF TABLES Special Tools for LX 800 5 2 List of Units 5 3 Symptom and Reference Pages 5 3 ROCX Board Parts List 5 11 ROCX Board Unit Repair 5 14 Printer Mechanism Parts List 5 14 Printer Mechanism Unit Repair 5 15 5 i ...

Page 102: ...gure 5 1 This flowchart shows the two levels of repair one is unit replacement in which the defective subassembly is identified and replaced and the other is component isolation and repair F Troubleshooting Unit replacement Electric Printer circuit mechanism Q Electric circuit G Printer mechanism unit repair unit repair Fig 5 1 Troubleshooting Procedure ARN NG Read section 4 1 GENERAL REPAIR INFOR...

Page 103: ...for LX 800 No Name Description Part No o E626 Extension cable between the ROCX CN5 B765 107901 and motors E524 Connector board and extension cable be B765 105201 E523 tween the ROCX CN4 and a printhead B765 105101 0 E594 Extension cable between the ROCX CN6 B765 105401 and a paper end sensor Extension cable between the ROCX CN7 and a home position sensor E201 Extension cable between the ROCX CN8 B...

Page 104: ...ndicators Reference Page Printer Does Not Operate No indicator on the control panel lights with Power Switch ON Carriage does not move 5 4 Abnormal Carriage Carriage moves away from home position at power ON Operation Although the carriage returns to the home position the 5 5 printer does not enter READY mode Incorrect Printing in self No printing is executed test with Normal Carriage Some dots do...

Page 105: ...rinter does not operate when power switch is on 1 on the ROC Filte Y Measure the output voltage from ROC Filter unit Refer to Table 2 2 Replace the ROC Filter unit Replace the printer mechanism v END T7 END 5 4 ...

Page 106: ...iage does not operate correctly connectors CN4 CN5 CN6 and CN7 connecting the ROCX board and the printer mechanism inserted securel I I secure connectors I Y N END N Replace the printer mechanism Y N d Y v END 5 5 ...

Page 107: ...ap adjustment lever at the side nearest the platen Measure the printhead resistance See Figure 5 3 Page 5 10 N a Y Replace the printhead I N 1 Y Replace the printer mechanism A the printer mechanism and the ROCX board N Replace the ROCX t board v 1 Q Reinsert them correctly u T END 7 END 5 6 ...

Page 108: ...elf test printing is normal but the paper is not fed Y START Set the paper correctly Y Replace the printer turned manually with mechanism Y Replace the printer mechanism END END N Replace the ROCX board END 5 7 ...

Page 109: ...ot operates correctly T START CN3 between the contro Reinsert connector CN3 panel and the ROCX board Y N Y Y Replace the control panel END Replace the ROCX circuit board N Y I Replace the ROCX circuit board 1 Replace the control panel ...

Page 110: ...computer operates normally Y START 1 Perform test printing N Refer to other troubleshoot ing items Y interface board Replace the optional interface board Standard Parallel N I I e END Replace the connection cable from the host com puter N Y 7 I Replace the ROCX circuit board END 5 9 ...

Page 111: ...REV A Printhead Terminal assignment o l 2 o 3 o 4 o i 5 O X6 o 7 O 8 o 9 Wire assignment Coil Resistance 19 2 1 9 Q at 25 C Between each dot wire and common Fig 5 3 Printhead Resistance 5 1o ...

Page 112: ... to the instructions given in this column 5 3 1 ROCX B o a r d Table 5 4 shows the main components of the ROCX Board The unit repair procedure for the ROCX board is described in Table 5 5 Table 54 ROCX Board Parts List Location I Part Name I Description I Part No F2 I Fuse I 125V 3 15A UL CSA I X502084020 Q21 Q25 Q1 Q9 2SD1832C4 60V 5A 20W X3021 83209 2SD1833C4 60V 7A 25W X302 183309 2SD1647C3 5V ...

Page 113: ... Switching regula tor IC or Switching transistors are defective Measure the voltage of IC3A Pin 8 Pin 8 20VDC Replace the IC3A or Q22 Fuse F2 is open Check fuse on the ROCX board Replace F2 Replace SR1 Q20 or Q21 Measure the waveform of SR1 and Q21 The 5V DC line is dead Switching regula tor IC SR1 or switching transis tors are defective Resistor is open Measure the resistance of R13 R13 2Q Replac...

Page 114: ...rmal 16 17 collector Refer to or IC3B Figure 2 19 Common voltage Check the voltage of Replace Q19 or switching is transistor Q19 emitter IC2B defective In driving 24V In holding 5V Paper feed con Phase switching is Measure the wave form Replace the de trol is abnormal abnormal of transistors Q 10 11 fective transistor 14 15 collector Refer to or IC3B Figure 2 25 Common voltage Check the voltage of...

Page 115: ...lists the recommended parts to keep in stock for repairing the printer mechanism The location numbers given in this table correspond to the numbers shown in Figure A 1 7 Table 5 6 Printer Mechanism Parts List Location No 402 413 416 417 418 430 444 446 448 Part Description I Part No Frame Paper Feeding Roller Spring Home Position Sensor Carriage Motor Timing Belt Paper End Sensor Head Cable Paper ...

Page 116: ...heck if the timing belt Replace the tim is broken ing belt The carriage Carriage movs Check if the carriage Clean and moves left ment is not moves smoothly when it lubricate slightly and smooth is moved manually stops Check if the tension of Replace the belt the timing belt is too tension spring high Buzzer rings 5 The home position Use an oscilloscope to Replace the times sensor is check the outp...

Page 117: ...ead cable is not connected correctly Clean and reconnect Check for foreign objects in the head cable connector The printhead is defective The printhead is defective Verify that the tip of the dot wire is not worn Verify that the tip of the dot wire is not worn Replace the printhead Replace the printhead The overall printing color is light or the printing density is not uniform The paper thick ness...

Page 118: ...lash be Check the backlash Replace the pa quantity is not tween the paper per feed reduc uniform feed motor and tion gear the paper feed re duction gear is not correct Paper does not The paper is Phases of the right Verify that the marks on Refer to Section feed correctly fed aslant and left sprocket the right and left sprock 4 2 3 9 Tractor assembly do not et assembly are at the Unit match same p...

Page 119: ...es ink is in the incorrect mask is in the correct mask stained where position position printing is not The paper thick Check that the set posi Place the lever in performed ness lever is not tion of the paper thick the right set at the correct ness lever is proper for position position the paper The platen gap is Perform adjust not properly ment according adjusted to Section 4 3 1 Platen Gap Adjust...

Page 120: ...UBRICATION AND ADHESIVE APPLICATION 6 1 LIST OF FIGURES Fig 6 1 Fig 6 2 Tabla 6 1 Table 6 2 Table 6 3 Correct Adhesive Application 6 2 LX 800 Lubrication Points 6 3 LIST OF TABLES Lubricants and Adhesive 6 1 Lubrication Points 6 2 Adhesive Application Points 6 2 6 i ...

Page 121: ...astic components of the printer 6 2 LUBRICATION AND ADHESIVE APPLICATION EPSON recommends that the points illustrated in Figure 6 2 be lubricated at the points listed in Table 6 2with EPSON O 2 and G 27 which have been tested for compliance with the needs of this printer Refer to Table 6 1 for details about O 2 and G 27 Be sure that the parts to be lubricated are clean before applying lubricant an...

Page 122: ... guide plate Contact portion with the carriage 50 mm G 27 L X 2 mm W 3 Platen gear Quarter of gears circle G 27 4 Shafts that sets the ribbon gears G 27 5 Gear portions of the ribbon gears G 27 6 Felt ring inside of the carriage o 2 Table 6 3 Adhesive Application Point Refer to Figure 6 l Adhesive Application Point No of Point Engaging part between timing belt and carriage 1 To Timing Belt Fig 6 1...

Page 123: ...REV A Fig 6 2 LX 800 Lubrication Points 6 3 ...

Page 124: ...ig A 14 Fig A 1 5 Fig A 1 6 Fig A 17 Fig A 18 Fig A 1 9 OP Code Fetch Timing A 6 Memory Read Timing A 6 Memory Write Timing A 6 E05A03BA E05A03CA Pin Diagram A 7 E05A03BA E05A03CA Block Diagram A 8 2064C Pin Diagram A 9 2064C S RAM Block Diagram A 9 494 IC Pin and Block Diagrams A 1 O 494 Dead Time and Feedback Control A 1 1 7407 Pin Diagram A 1 2 LCPNL Circuit Diagram A 1 3 ROCX Board Circuit Dia...

Page 125: ...e A 7 494 IC Port Functions A 1 O Table A 8 Connector CN1 Pin Assignment Table A 9 Connactor CN2 Pin Assignment Table A 10 Connector CN3 Pin Assignment Table A 1 1 Connector CN4 Pin Assignment Table A 12 Connector CN5 Pin Assignment Table A 1 3 Connector CN6 Pin Assignment Table A 14 Connector CN7 Pin Assignment Table A 1 5 Connector CN8 Pin Assignment Table A 16 Parts No Reference Table A 1 6 A 1...

Page 126: ... the principal ICS used in LX 800 The ICS are shown in Table A 1 Table A 1 Primary ICS on the ROCX Board I Location No ICs Nmne I Part Code No I 2B pPD7810HG X400078 101 3B E05A03 Y448800001 4C 2064C X4001 43644 3A pPc494c X440064940 1 c 2C 7407 X4201 OOO7O A 1 ...

Page 127: ...e 7811 CPU Direct addressing of up to 64K bytes 8 bit A D converter 158 instructions 1 KS instruction cycle 16 bit event counter Two 8 bit timer counters 3 external and 8 internal interrupts 6 priority levels and 6 interrupt addresses General purpose serial interface asynchronous synchronous and 1 0 modes 1 0 line 78 1 1 40 bit 1 0 port 78 10 24 bit edge detection 4 inputs Zero cross detection Sta...

Page 128: ... PORTF H PORTD II PORTC I 11 oflo m m m 0 PORTB 11 PORTA I In 2 z n z a w 1 Z In 1 1 ID x u Q v a Fig A 2 wPD7810 7811 Block Diagram A 3 ...

Page 129: ...t Port Port AB1 1 Port Port AB 13 AB 12 AB 11 I AB 15 AB14 AB 13 AB 12 AB 11 PF2 PF1 PFO External Memory Port Port Port 256 Bytes max AB1O I AB9 I AB8 I 4K Bytes max I AB1O I AB9 I AB8 I 16K Bytes max I AB 10 AB9 AB8 64K Bytes max I Table A 4 PD7810 PF Operation MODE 1 MODE O PF7 PF6 PF5 PF4 PF3 PF2 PF1 PFO External Memory o 0 Port Port Port Port AB 11 AB 10 AB9 AB8 4K Bytes o 1 Port Port AB13 ABI...

Page 130: ...ight 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 42 VAref In Reference voltage 43 AVCC Analog Vcc 44 m out 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 ...

Page 131: ...med 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 bus lines AD7 0 pD7 O are not disabIed and write data is output at AD7 0 at the beginning of T1 and the end of T3 NOTE When lines PD7 0 are set to the multiplexed addressldata bus AD7 O and PF7 0 to the address bus AB7 O the ...

Page 132: ...lock diagram The details of the E05A03BA are given in section 2 4 2 Vcc 1 Vcc NLOLP 2 63 HD 1 3 4 5 6 7 6 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 62 HD2 61 HD3 60 4 HD4 59 HD5 58 4 HD6 57 HD7 56 HD8 55 HD9 54 INO 53 IN 1 52 IN2 51 IN3 50 IN4 49 Q IN5 48 IN6 47 IN7 46 STRB 45 INIT 44 AB7 43 4 AB6 42 4 AB5 41 AB4 40 AB3 39 AB2 38 AB 1 37 4 ABO 36 B U S Y 35 PE 34 CNDLP...

Page 133: ...LE I I I AD 13 1 15 Address Latch T Decode Signal Address Data Bus Ih I I Decoder t I I I I I I I Parallel l F Data Latch m WR CR Motor Drivek PF Motor Driver Printhead Driver Lamp Driver Fig A 7 E05A03BA E05A03CA Block Diagram A 8 ...

Page 134: ...ess Write enable Output enable Chip select Input Output data No connection Memory Ce I I Array 512 X 46 X 6 AtO All A12 Csl ICI CSI CS2 t 6 Cm ml CS2 Logic d b A12 A A 6 A5 A 4 A 3 A 2 A4 AO D1 D 2 D 3 Vss L 5 2 0 6 7 8 10 13 14 4 C 25 A8 24 A9 23 All 21 AtO 20 KI 19 D7 17 0 5 16 D4 Fig A 8 2064C Pin Diagram 00 D 02 03 D 4 05 06 07 Fig A 9 2064C SRAM Block Diagram Table A 6 2064C Truth Table Csl C...

Page 135: ...tage detection I 2 I INV I Inv Input of error amplifier foroutput voltage detection 3 FEEDBACK Feedback for phase correction 4 CONTROL Controls transistor OFF time 5 CT Capacitor for oscillation frequency adjustment 6 RT Resistor for oscillation frequency adjustment 7 GND Ground 8 c l Transistor collector for pulse amplification 9 El Transistor emitter for pulse amplification I 10 I E2 I Transisto...

Page 136: ...O OpEN L495 O OpEN o N L v 50KCl GND VOLTAGE AT Cl VOLTAGE A TC2 VOLTAGE ATCT DEAD TIME Tt REsHoLO VOLr E CONTROL IN PUT Ov I I THRESHOLO vOLTAGE FEEO BACK j I 07 v I OUTV 1 1 l_o CYCLE M X MAX J J d V O L T A G E W A V E F O R M S Fig A 1 1 494 Dead Time and Feedback Control A 1 1 ...

Page 137: ...REV A A 1 5 7 4 0 7 The 7407 has hex open collector buffers as shown in Figure A 12 Vcc 6A 6Y 5A 5Y 4A 4Y Fig A 1 2 7407 Pin Diagram 4 1 2 ...

Page 138: ...A 2 SCHEMATICS AND DIAGRAMS cl f Fig A 1 3 LCPNL Circuit Diagram A 1 3 ...

Page 139: ... 5 W SW R70 W 7 w ii 4 3 4 2 0s 3 5 R34 cm 3 7 Z03 C17 x I SW2 1 Swl B3S CNI Fig A 15 ROCX Board Component Layout A 1 7 ...

Page 140: ... PANEL 446 PAPER FEED MOTOR 300 ROC FILTER UNIT 120V 447 PAPER FEED REDUCTION GEAR 301 ROC FILTER UNIT 220V 448 PRINTHEAD 302 ROC FILTER UNIT 240V 501 SPROCKET ASSEMBLY LEFT 303 ROC FILTER UNIT 120V 2PLUGS 502 SPROCKET ASSEMBLY RIGHT 304 FUSE 125V 1 25A 503 PAPER HOLDING COVER LEFT 305 FUSE 250V O 63A 504 PAPER HOLDING COVER RIGHT 400 PRINTER MECHANISM UNIT 505 PAPER HOLDING COVER SPRING 401 RIBBO...

Page 141: ...ICS Unit 3 17 Rodborough Road SINGAPORE PTEo LTD Frenchs Forest NSW 2086 Australia No 1 Maritime Square 02 19 Phone 02 452 5222 World Trade Centre Singapore 0409 Telex 75052 Phone 2786071 2 Telex 39536 EPSON ELECTRONICS TRADING LTD EPSON ELECTRONICS TRADING LTD 25 F Harbour Centre TAIWAN BRANCH 25 Harbour Road Wanchai 10F No 287 Nanking E Road Sec 3 Hong Kong Taipei Taiwan R O C Phone 5 8314600 Ph...

Page 142: ...Printad in Japan 87 07 6 ...

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