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Epson 2070 - LQ B/W Dot-matrix Printer, Service Manual

The Epson 2070 - LQ B/W Dot-matrix Printer provides high-quality black and white printing for your business needs. Ensure optimal performance by accessing the Product Support Bulletin and user manual, available for free download at manualshive.com. Easily access all the necessary information to maximize the potential of your printer.

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5.5 REPAIRING THE C186 MAIN BOARD ASSEMBLY

This section provides instructions to repair the C186 MAIN board assembly. It describes various problems,
symptoms, likely causes, and solutions. The checkpoint column provides proper waveforms, resistance
values, and other information for each component of C186 MAIN.

Note:
This information is necessary only for servicers who repair to the component level. Servicers who
repair to the unit level (including all servicers in the U.S.) can ignore this section.

Table 5-7. Repairing the C186 MAIN Board Assembly

Problem

Cause

Checkpoint

Solution

The printer
does not
operate at all.

Reset IC10 is defective.

Check the voltage waveforms of the VCC
signal (CH1: IC10 pin 3 ) and VOUT signal
(CH2: IC10 pin 1) when power is turned
on.

Replace IC10.

^

The PROM (IC3) is not
selected.

Check for a change in the signal from
HIGH/LOW at pin 137 of IC2.

Replace IC2 (or
replace the main
board).

^

The PSRAM (IC5) is
not selected

Check for a change in the signal from
HIGH/LOW at pin 132 of the IC.

Replace IC2 (or
replace the main
board).

LQ-2070 Service Manual

Troubleshooting

Rev.A

5-13

Summary of Contents for 2070 - LQ B/W Dot-matrix Printer

Page 1: ...EPSON TERMINAL PRINTER LQ 2070 SERVICE MANUAL EPSON 4006244 ...

Page 2: ...ject 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 the consequences thereof Copyright 1995 by SEIKO EPSON CORPORATION Nagano Japan ...

Page 3: ...O NOT CONNECT THE UNIT TO A POWER SOURCE UNIT 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 CERTIFIED REPAIR TECHNICIAN 2 MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE LISTED ON THE SERIAL NUMBER RATIG PLA...

Page 4: ...re organized as follows Chapter 1 Provides a general product overview Lists specifications and illustrates the main components of the printer Chapter 2 Describes the theory of printer operation Chapter 3 Includes a step by step guide for product disassembly and assembly Chapter 4 Includes a step by step guide for addjustement Chapter 5 Provides Epson approved techniques for troubleshooting Chapter...

Page 5: ...REVISION SHEET Revision Issued Date Revision Page Rev A April 8 1996 1st issued ...

Page 6: ...TABLE OF CONTENTS CHAPTER 1 GENERAL DESCRIPTION CHAPTER 2 OPERATION PRINCIPLES CHAPTER 3 DISASSEMBLY AND ASSEMBLY CHAPTER 4 ADJUSTMENTS CHAPTER 5 TROUBLESHOOTING CHAPTER 6 MAINTENANCE APPENDIX ...

Page 7: ...pecifications 1 21 1 3 2 1 Parallel Interface Forward Channel 1 21 1 3 2 2 Parallel interface Reverse Channel 1 23 1 3 2 3 Interface Selection 1 24 1 3 2 4 Preventing the Host from Data Time out 1 24 1 3 3 Paper Handling Firmware Specifications 1 25 1 3 4 PaperWidth Sensor Operation 1 28 1 4 Operating Instructions 1 29 1 4 1 Control Panel Operation 1 29 1 4 2 Status Codes Indicated by the LEDs and...

Page 8: ...ntable Area for Envelopes and Card Stock 1 11 Figure l 5 PrintableAreafor Continuous Paper 1 13 Figure 1 6 Label Size 1 14 Figure 1 7 Printable Area for Roll Paper 1 15 Figure l 8 Data Transmission Timing 1 22 Figure l 9 Control Panel 1 29 Figure 1 10 Self test Printout 1 32 Figure l 11 Hexadecimal Dump Printout 1 32 Figure l 12 Main Components 1 35 Figure l 13 C186MAlN Board Assembly 1 36 Figure ...

Page 9: ...1 16 Table 1 20 Electrical Specifications for 120 V Version 1 1 6 Table 1 21 Electrical Specifications for 220 240 V Version 1 16 Table 1 22 Environmental Conditions 1 17 Table 1 23 Reliability 1 17 Table 1 24 Safety Information for Printer Models 1 17 Table 1 25 CE Marking 1 18 Table 1 26 Physical Specifications 1 18 Table 1 27 Hopper Capacity 1 1 8 Table 1 28 Stacker Capacity 1 19 Table 1 29 Env...

Page 10: ...front rear bottom Front push tractor option rear push actor CSF bin 1 bin 2 option Pull tractor option roll paper holder option Single sheet continuous paper multipart paper envelopes card labels roll paper 9 LQ and 1 draft bitmap typefaces 4 Sarable typefaces 8 barcode fonts Standard version 11 tables NLSP version 20 tables 64KB 51 dB A 1S0 7779 pattern Total print volume 6 million lines except p...

Page 11: ...Product Description LQ 2070 Service Manual Figure 1 1 Exterior View of the LQ 2070 1 2 Rev A ...

Page 12: ...onal Units Unit Description High capacity cut sheet feeder 1 bin 1 C80673 Second bin cut sheet feeder 2 bin 2 I C80674 I Pull tractor unit C80032 Roll paper holder 831 O Serial l F card C82305 C82306 32KB intelligent serial l F card C82307 C82308 32KB intelligent parallel l F card C8231O C82311 Local Talk l F card C82312 32KB IEEE 488 l F card C82313 Coax l F card C82314 Twinax l F card C82315 Eth...

Page 13: ... 2 mm 0 0079 inch 1 0 141mm 1 180 f 108 0 2 1I18O J gd re on 2 9Tf 7 T 4 6 7 8 9 3 246mm b lo 23 180 l 1 b b 12 13 I Head center 0 5 T I T 16 l T I 9 18 19 I 1 20 21 I v 4 22 23 I 0 423mm l160 1 r 1 l Figure 1 2 Pin Configuration k The figure above shows the configuration of pins on the paper Print direction Bidirectional with logic seeking for text and unidirectional for graphics Bidirectional pr...

Page 14: ...d 20 cpi 272 275 183 10 cpi 136 92 61 LQ 12 cpi 163 110 73 15 cpi 204 138 92 17 cpi 233 157 105 LQ Condensed 20 cpi 2 7 2 183 122 Resolution Table 1 5 Print Resolution Print Mode Horizontal Density Vertical Density Adjacent Dot Printed High speed draft 90 dpi 180 dpi No Draft 120 dpi 180 dpi No Draft condensed 240 dpi 180 dpi No LQ 360 dpi 180 dpi No 60 80 90 or 120 dpi 60 dpi Yes 8 pin bit image ...

Page 15: ...ch feed 45 msec Continuous feed 0 127 m see 5 0 inches see Release lever Set the release lever using the following table Table 1 6 Paper Path and Paper Types Paper Types Lever Position Paper Entrance Single Sheet Labels Card Stock I Envelopes Multipart Roll Paper Front insedion OK NO OK OK NO Rear insertion OK NO OK OK NO Friction CSF bin 1 OK NO OK OK NO CSF bin 2 OK NO NO NO NO Roll paper holder...

Page 16: ...area Do not perform reverse feeds greater than 1 6 inch after the paper endhasbeen detected Use the paper tension unit Insert the multipart cut sheet forms only from the front 2 Push tractor feed Set the release lever to the REAR PUSH FRONT PUSH position and install the paper eject assembly Load paper from the rear or front entrance Release the friction feed mechanism Multipart paper must be carbo...

Page 17: ...m 4 0 420 mm 1 6 5 101 mm 4 0 420 mm 16 5 Length 147 mm 5 8 420 mm 16 5 101 mm 4 0 420 mm 16 5 Thickness 0 065 mm O 0025 0 14 mm 0 0055 0 065 mm O 0025 0 14 mm 0 0055 Weight 52 3 g m2 14 lb 90 g m2 24 lb 52 3 g m2 14 lb 90 g m2 24 lb I I Quality Plain paper recycled paper Plain paper recycled paper Not curled not folded or not crumpled Not curled not folded or not crumpled Table 1 9 Specifications...

Page 18: ...r to Table 1 8 Refer to Table 1 9 LM left margin 3 mm 0 12 or more 3 mm 0 1 2 or more PW 364 mm 14 33 PW 364 mm 14 33 25 mm 0 98 or more 25 mm 0 98 or more PW 420 mm 16 5 PW 420 mm 16 5 RM right margin 3 mm or more 3 mm or more PWs 364 mm 14 33 PW S 364 mm 14 33 25 mm 0 98 or more 25 mm 0 98 or more PW 420 mm 16 5 PW 420 mm 16 5 TM top margin 4 2 mm 0 17 or more 4 2 mm 0 17 or more BM bottom margi...

Page 19: ... MDled Printing on envelopes is available only at normal temperatures and humidity Insert envelopes from the rear entrance only X Insert the longer side of the envelope horizontally Table 1 12 Specifications for Card Stock Front Entry Rear Entry Minimum Maximum Minimum Maximum Width 105 mm 4 13 148 mm 5 83 105 mm 4 1 3 148 mm 5 83 Length 148 mm 5 83 148 mm 5 83 105 mm 4 13 148 mm 5 83 Thickness 0 ...

Page 20: ...ns Envelopes Card Stock PW width Refer to Table 1 11 Refer to Table 1 12 PL length Refer to Table 1 11 Refer to Table 1 12 LM left margin 3 mm 0 1 2 or more 3 mm 0 12 or more RM right margin 3 mm 0 12 or more 3 mm 0 12 or more TM top margin 4 2 mm 0 17 or more 4 2 mm 0 17 or more BM bottom margin 4 2 mm 0 17 or more 4 2 mm 0 1 7 or more t Pw 1 I w TM Pw K 1 I LM i RMk I I J TM BM Figure 1 4 Printa...

Page 21: ...16 4 0 16 101 mm 559 mm 101 mm 559 mm 101 mm 559 mm 4 0 22 4 0 22 4 0 22 1 original 3 copies 1 original 3 copies 1 original 3 copies 0 065 mm 0 32 mm 0 065 mm 0 32 mm 0 065 mm 0 32 mm 0 0025 0 013 0 0025 0 013 0 0025 0 013 52 3 g m2 82 g m2 52 3 g m2 82 g m2 52 3 g m2 82 g m2 14 lb 22 lb 14 lb 22 lb 14 lb 22 lb 40 g m2 58 g m2 40 g m2 58 g m2 40 g m2 58 g m2 12 lb 15 lb 12 lb 15 lb 12 lb 15 lb Pla...

Page 22: ...table Table 1 15 Printable Area for Continuous Paper I Abbreviations I Continuous Paper PW width Refer to Table 1 14 PL length Refer to Table 1 14 LM left margin 13 mm 0 51 or more RM right margin 13 mm 0 51 or more TM top margin 4 2 mm 0 17 or more BM bottom margin 4 2 mm 0 1 7 or more Pw I I I I 0 t l 4 BM T Figure 1 5 Printable Area for Continuous Paper Rev A 1 13 ...

Page 23: ...0035 Total thickness 0 16 mm 0 19 mm 0 16 mm 0 19 mm 0 0063 0 0075 0 0063 0 0075 Label weight 68 g m2 17 lb 68 g m2 17 lb Quality A very continuous Avery continuous form labels form labels A very mini line or Avery mini line or equivalent quality equivalent quality labels labels Printing on labels is available only at normal temperatures and humidity The base sheet for the labels must be continuou...

Page 24: ...ickness 0 07 mm 0 0028 0 09 mm 0 0035 Weight 52 3 g m2 14 lb 82 g m2 22 lb Quality I Plain paper recycled paper Not curled not folded or not crumpled Printable area Figure 1 7 gives the printable area for roll paper Each abbreviation is defined in the following table Table 1 18 Printable Area for Roll Paper Abbreviations Roll Paper PW width See Table 1 17 PL length See Table 1 17 LM 3 mm 0 12 or m...

Page 25: ...0t060 Hz Input frequency range Rated current 49 5 to 60 5 Hz 1 0 A max 2 4A Power consumption Approx 34 W self test in draft mode at 10 cpi Insulation resistance 10 MQ min between AC line and chassis 500VDC Dielectric strength I 1000 VAC rms 1 min or 1200 VAC rms 1 sec between AC line and chassis Table 1 21 Electrical Specifications for the 220 240 V Version Item Specifications Rated voltage Input...

Page 26: ...50 G 10 to 55 Hz non oDeratina 3 1 Without condensation 2 During printing on multipart paper envelopes card stock or labels 3 In shipment container 1 2 8 Reliability Table 1 23 gives maximum life and usage specifications Table 1 23 Reliability Statistics Item Specification 1 Total print volume 6 million lines except printhead MTBF 6000 power on hours POH 1 Printhead life I 200 million strakes wire...

Page 27: ...or to load the paper quickly The 2nd bin CSF can be connected to the high capacity CSF to allow them to be used as a double bin CSF The following table provides the specifications for these CSF options Hopper capacity Table 1 27 Hopper Capacity CSF Bin 1 CSF Bin 2 Single sheets 150 sheets 1 110 sheets 2 50 sheets 1 50 sheets 2 185 sheets 3 135 sheets 4 60 sheets 3 60 sheets 3 4 Envelopes 25 sheets...

Page 28: ...pes weighti 45 g m2 12 lb Card stock weight 192 g m2 51 lb thickness 0 22 mm 0 0087 1 original 5 copies thickness 0 36 mm 0 0142 Reliability MCBF 2 x 105 cycles Environmental conditions Table 1 29 Environmental Conditions Operating Non Operating Temperature 5 to 35 c 41 to 95 l 30 to 60 C 22 to 140 F Humidity 10 to 80 RH 1 X 3 30 to 60 RH 2 X 3 O to 85 RH 3 Single sheets plain 64 g m2 weight 82 g ...

Page 29: ...pt 8pt 32pt every 2pt Bar code fonts EAN 13 EAN 8 Interleaved 2 of 5 UPC A UPC E Code 39 Code 128 POSTNET 14 countries U S A France Germany U K Denmark 1 Sweden Italy Spain l Japan Norway Denmark2 Spain2 Latin America Korea Legal The standard version has 11 character tables and the NLSP version has 20 character tables as shown in the following table Table 1 30 Character Tables Version Character Ta...

Page 30: ...nter bit O LSB 3 DATA2 21 In bit 1 4 DATA3 22 In bit 2 5 DATA4 23 In bit 3 6 DATA5 24 In bit 4 7 DATA6 25 In bit 5 8 DATA7 26 In bit 6 9 DATA8 27 In bit 7 MSB 10 ACKNLG 28 out This signal negative pulse indicates the printer has received data and is ready to accept more data 11 BUSY 29 out This signal s HIGH level means the printer is not ready to accept data 12 PE 28 out This signal s HIGH level ...

Page 31: ... 120 nsec ttin 200 nsec 0 The BUSY signal is active HIGH level under the conditions below 0 During data receipt 0 If the input buffer is full 0 If the INITsignal is active LOW level 0 During hardware initialization 0 In self test mode 0 In adjustment mode 0 In default setting mode 0 The ERROR signal is active LOW level under the conditions below 0 If there is a fatal error 0 If there is a paper ou...

Page 32: ...3 6 DATA5 24 In bit 4 7 DATA6 25 In bit 5 8 DATA7 26 In bit 6 9 DATA8 27 In bit 7 MSB 10 PtrClk 28 out Printer clock signal 11 PtrBusy I 29 out Printer busy signal and reverse channel transfer of data DataBit 3 7 bits 3 or 7 12 AckDataReq 28 out Acknowledge data request signal and reverse channel DataBit 2 6 transfer of data bits 2 or 6 13 Xflag 28 out X flag signal and reverse channel transfer of...

Page 33: ...tate As long as the host sends data or the printer interface is busy the selected interface remains active Interface state and interface selection When the parallel interface is not selected that interface goes into a busy state When the Type B serial interface card is installed and it is not selected the interface sends an XOFF code and sets the DTR signal to MARK When the optional interface is n...

Page 34: ...e paper path is changed for cut sheets Printer status The rear PE sensor detects that paper is loaded in the rear paper path The release lever is set to continuous paper Table 1 35 Paper Handling Sequence 2 Occurrence Result Pause button pressed The printer goes off or on line LF FF button pressed The printer performs a line feed LF FF button held down continuously The printer performs a form feed...

Page 35: ...eeper sounds Front paper end sensor detects that paper The beeper sounds was loaded in the rear paper path Printer status Printer is on line not in the pause state No PE sensor detects that paper is loaded The printer is set to CSF The release lever is set to the Friction Table 1 37 Paper Handling Sequence 4 Occurrence Result Print command sent The paper is loaded from the CSF Pause button pressed...

Page 36: ...ward Micro Adjust button pressed The printer micro feeds paper backward Release lever set to the tractor position The beeper sounds Front paper end sensor detects that paper The beeper sounds was loaded in the rear paper path Printer status Front PE sensor detects that paper is loaded in the rear paper path The release lever position is set to Friction Table 1 39 Paper Handling Sequence 6 Trigger ...

Page 37: ...age cut function is operational as shown in the following table Table 1 40 PW Sensor Operation I Paper Path PaperWidth Measurement I Image Cut Function I Friction Measured Executed Only Copy Mode 2 Push Tractor Rear Front Measured Not Executed X 1 Pull Tractor Measured Not Executed 1 1 The measured paper width value is used to estimate the printhead centering position When narrow continuous paper ...

Page 38: ...D Blinks Figure 1 9 Control Panel Operation in normal mode In normal mode pressing panel buttons executes following functions t Pause Load Eject LF I FF t I Font I C o n d e n s e d SS Paper Out Operate m Table 1 41 Operation in Normal Mode I Function Turns the printer on and off Alternates printing and non printing states Enables the micro adiust function when held down for 3 seconds Loads or eje...

Page 39: ...n at Default Setting Mode Button Function Font Selects the menu Tear Off Bin Changes the setting Others Not available 1 4 2 Status Codes Indicated by the LEDs and Beeper Table 1 44 Indicators and Beeper Pause Paper Out Tear Off I Condensed Bin Font Beeper Pause On Paper Out On On 0 0 0 Paper Jam On Blinks 0 0 0 0 Head Hot Blinks Release Lever On Blinks 0 0 0 0 Micro Adjust Blinks 0 Tear Off 0 Bin ...

Page 40: ... EEPROM and if the printer is turned off the setting is not cleared Conditions required for the adjustment Auto tear off function 0 Auto tear off has been set to ON in default setting mode 0 The release lever has been set to Tractor 0 The data buffer is empty and the printer is on line 0 More than 3 seconds have passed after tAe host computer finished transferring print data Manual tear off functi...

Page 41: ...GH I J KLMNOPQRSTUVWXYZ 1 abcde f gh i 1 k 1 mnOPq r St uvwx 0123456789 c ABCDE FGH I J K LMNOPQRSTUVWXY Z 1 abc de f gh i 1 k 1 mnoPcl r St uvwx Y 01 23456789 eABCDEFGli 1 JKLMNOPQRSTUVWx YZ abcdef gh i j k 1 mnopq rst uvwx YZ 1234567B9 eABcDEFGHIJKLMNOPQRSTUVWXYZ iabcdef9hi jklmnopqrstuvwxyz ABcDEFGHIJKLMNOP 2RSTUVWXYZ abcdefghi iklmnopqrstuvwxyz j 0123456789 0123456789 oABCDEFGHIJKLMNOPQRSTUVWX...

Page 42: ...buttons while turning on the printer resets the EEPROM to the standard factory settings This operation initializes the iterns below to the factory settings in the right hand column Table 1 45 EEPROM Initialization Settings Setting I Factory Default Font I Roman Condensed 10 CPI Character Table PC437 Page Format Page Length 11 inches Tractor Rear Front TOF Position 8 5 mm 0 333 inches Bottom Margin...

Page 43: ...This function does not remain after the printer is turned off 1 5 Initialization 1 5 1 Software Initialization This initialization is activated by the control code ESC This initialization 0 Clears unprinted data 0 Resets the printer s setting defaults 1 5 2 Operation Initialization This initialization is activated by receipt of the signal negative pulse This initialization Cl Clears the buffer of ...

Page 44: ... of the LQ 2070 are designed for easy removal and repair The main components are 0 C186 MAIN Board Assembly 0C166PSB PSE Board Assembly 120 V 230V 0 C165 PNL Bowd Assembly 0 Printer Mechanism Cl HousingAssembly The following figure shows the main components of the LQ 2070 Rev A 1 35 ...

Page 45: ...gure 1 13 C186 MAIN Board Assembly 1 6 2 C166 PSB PSE Board Assembly These boardshave two AC input voltage ratings 120VAC C166PSB and230VAC C166PSE Both boards consist of a transformer switcking FET regulator IC diode bridge etc The power supply board provides 5 VDC and 35 VDC for the main board and printer mechanism F1 Q1 Pcl IC52 Fuse Switching FET Photo Coupler OP amp I I CIkD El D o C o 0 n 1 ...

Page 46: ...oduct Description LQ 2070 Service Manual 1 6 5 Housing Assembly This consists of printer cover assembly edge guide assembly upper housing lower housing assembly etc Figure 1 17 Housing Assembly 1 38 Rev A ...

Page 47: ...r Advance Mechanism 2 5 2 1 5 Paper Paths 2 11 2 1 6 Ribbon Advance Mechanism 2 16 2 2 POWER SUPPLY OPERATION 2 17 2 2 1 Power Supply Overview 2 17 2 2 2 Power Supply Circuit Operation 2 18 2 3 CONTROL CIRCUIT 2 22 2 3 1 Control Circuit Operation Overview 2 22 2 3 2 System Reset Circuit 2 24 2 3 3 Printhead Driver Circuit 2 24 2 3 4 CR Motor Driver Circuit 2 25 2 3 5 PF Motor Driver Circuit 2 26 2...

Page 48: ...ce 2 14 Figure 2 19 Pull Tractor Feeding Using the Front Entrance 2 15 Figure 2 20 Push Pull Tractor Feeding Using the Front Entrance 2 15 Figure 2 21 Ribbon Advance Mechanism 2 16 Figure 2 22 Power Supply Circuit Block Diagram 2 17 Figure 2 23 Power Switch Circuit 2 18 Figure 2 24 Over Voltage Protection Circuit 2 18 Figure 2 25 35 V Line Constant Voltage Control Circuit 2 19 Figure 2 26 35 V Lin...

Page 49: ...is connected to the core rushes toward the platen 3 When the dot wire impacts the platen pressing against the ribbon and paper it prints a dot 4 When the driving voltage stops energizing the coil the magnetic force from the iron core vanishes The actuating plate returns to its original position the position before coil was energized with spring action The dot wire also returns to its original posi...

Page 50: ...asis for determining the carriage position The HP sensor informs the CPU when the carriage is at the home position The sensor is ON when the carriage is pushed to the right or left The striker on the carriage activates the sensor to indicate the carriage is at the home position which toggles the sensor to OFF Table 2 1 CR Motor Assembly Specifications Category Requirement Type 4 phase 200 pole HB ...

Page 51: ...to protect the printhead The following table show you the relationship between the platen gap and the print speed Table 2 2 Platen Gap and Print Speed Paper Type Paper Thickness mm Adjust Lever Position PG SW Print Speed Single Sheet 0 065 14 lb 0 Closed Normal 0 1 22 lb 0 Closed Normal 0 14 24 lb 1 Closed Normal Continuous Paper Single Sheet 0 065 14 lb 0 Closed Normal 0 09 20 lb 0 Closed Normal ...

Page 52: ... and RLSW2 See the following table The RLSW1 sensor is located on the left side frame and the RLSW2 sensor is located on the inside of the right sub frame Refer to Figure 2 4 Table 2 3 Release Lever Position Release Lever Position Status of Paper Guide Rollers RLSW1 RLSW2 Friction mode The paper guide rollers are pressed against the platen Open Open Rear push tractor mode The paper guide rollers a...

Page 53: ...ck arrow driving the paper advance reduction gear The paper advance reduction gear turns the platen gear and paper tension roller gear Paper advances in the direction of the white arrow Figure 2 5 shows the friction advance method when paper is fed through the top paper entrance In the friction advance method the paper guide roller spring holds the paper against the platen Paper can be released by...

Page 54: ...ue generated by the PF motor is transmitted to the push tractor gear through the PF motor pinion gear paper advance reduction gear platen gear and gear train in the front part of the printer When the PF motor pinion gear turns in the direction of the black arrow the tractor gear rotates in the direction of the black arrow and thus feeds paper into the printer Paper is advanced by the paper drive r...

Page 55: ...LQ 2070 Service Manual Operating Principles Rev A 2 7 ...

Page 56: ...ce and pushes paper into the printer On the other hand the pull tractor is installed at the paper exit and pulls paper out of the printer mechanism As a result the paper tension unit is not required Figure 2 8 illustrates pull tractor operation when paper is fed through the bottom paper entrance Operation Principles LQ 2070 Servcie Manual 2 8 Rev A ...

Page 57: ...nd the other at the rear paper entrance They operate simultaneously to push and pull the paper through the printer mechanism Figure 2 9 illustrates push pull tractor operation when paper is fed through the rear paper entrance Figure 2 10 illustrates push pull tractor operation when paper is fed through the front entrance LQ 2070 Service Manual Operating Principles Rev A 2 9 ...

Page 58: ...Operation Principles LQ 2070 Servcie Manual 2 10 Rev A ...

Page 59: ...e printer mechanism See the figure below 1 Top Entrance Figure 2 12 shows the paper path for friction feed using the top entrance The top entrance is only used with the friction feed method When the top entrance is used the rear PE sensor detects when the paper is out Up Up Rear Driven PF Roller Front Driven PF Roller Lower Driven PF Roller Rear PE Sensor Printhead Front Paper Guide Paper Drive Ro...

Page 60: ... push tractor feed pull tractor feed or push pull tractor feed When you use the rear entrance the rear PE sensor detects when paper is out As shown above in Figure 2 14 when you use the pull tractor in this printer you must remove the paper eject cover which includes the paper tension roller from the printer mechanism Down Down Operation Principles LQ 2070 Servcie Manual 2 12 Rev A ...

Page 61: ...aper tension roller from the printer mechanism 3 Bottom Entrance Figure 2 16 shows the paper path for tractor feeding using the bottom entrance The bottom entrance is used only for pull tractor feed When the bottom entrance is used the front PE sensor detects when paper is out Down LQ 2070 Service Manual Operating Principles Rev A 2 13 ...

Page 62: ...he front entrance can be used with any of the following paper feed methods friction feed push tractor feed pull tractor feed or push pull tractor feed When the front entrance is used the front PE sensor detects when paper is out Up Up Operation Principles LQ 2070 Servcie Manual 2 14 Rev A ...

Page 63: ...Down LQ 2070 Service Manual Operating Principles Rev A 2 15 ...

Page 64: ...use a planetary gear is used in the gear linkage Table 2 4 Ribbon Advance Gear Linkage Direction of Carriage Movement Gear Linkage Left to right indicated by the black arrow Belt driven pulley Gear 1 Gear 2 Ribbon driving gear Right to light indicated by the white arrow Belt driven pulley Gear 1 Gear 3 Gear 4 Ribbon driving gear The ribbon brake spring attached to the exit of the cartridge case pr...

Page 65: ...r supply circuitry As shown in the figure above when AC power enters the printer from an external power source the filter circuit removes the noise The AC voltage then undergoes full wave rectification and is smoothed to produce direct voltage The voltage is fed to the gate port for the switching FET Q1 K2126 or K21230 through resistors R18 and R31 and then the switching circuit operates The secon...

Page 66: ...C Line Over Voltage Protection Circuit This circuit is shown below The 35 VDC over voltage protection circuit operates when voltage exceeds 42 42 V between ZD52 and ZD87 and shuts off the switching FET Q1 K2126 or K2130 The 5 VDC over voltage protection circuit operates when voltage exceeds 7 5 V between ZD53 and shuts off the switching FET Q1 K2126 or K2130 When either of these protection circuit...

Page 67: ...g maintained In this condition the forward current of PC1 drops to 0 A Consequently voltage Vf between PC1 and D81 also drops On this circuit when the Vf voltage drops below 1 3 V 35 V line 33 1 V IC528 detects the overload and outputs the PWDN signal 5 V HIGH active to port 20 of the CPU When the CPU receives this PWDN signal printing stops When the 35 V line becomes normal again the voltage betw...

Page 68: ...ent control circuit is shown below Port 2 of IC51 TL494CN monitors the 5 V line and this protection circuit operates when the 5 V line goes below 4 75 V When this circuit operates port 8 signal output of the PWM pulse stops and Q51 stops its switching operation Consequently the 5 V line stops generating 35V Line GND Q53 R70 R71 R72 R73 Q54 Q82 C57 R74 R75 R54 R68 3 4 6 5 D85 Q31 PSC Figure 2 27 35...

Page 69: ... is input into port 15 When the voltage of port 16 goes below 4 81 V or above 5 17 V the pulse width of the PWM signal which is output from port 8 changes and the 5 V line is kept between 4 81 V to 5 17 V 5v Line GN D R53 R88 R64 R65 IC51 TL494CN D51 L51 8 R51 R61 Q51 16 15 35V R81 R59 R60 ZD55 GND GND Figure 2 29 5 V Line Constant Voltage Control Circuit LQ 2070 Service Manual Operating Principle...

Page 70: ... It oversees control of all the components in the printer The following chart shows you a block diagram of the control circuit Gate Array CPU CSF Drv CSF Detector PE Rear Detector PE Front Detector P Width Detector Home Detector Release Lever Detector Gap Lever Detector 35V Voltage Detector Head Drv Head Temp Detector ROM RAM EEPROM Rest IC PF Drv CR Drv Panel LED Power SW Parallel I F Type B I F ...

Page 71: ... of the address data bus from the CPU Clock control unit Bit manipulation Interface control Expanded parallel port Printhead control Motor control EEPROM IC 8 An electrically writable and erasable ROM used to hold information such as the TOF position and bidirectional adjustment value ROM IC 3 The ROM contains the program that runs the CPU and holds the character design also called the character g...

Page 72: ...ad driver pulse width Using the monitored voltage the CPU converts the voltage to a digital value and decides the printhead driver pulse width and then transports the data to the gate array via CPU port 15 Based on the monitored voltage the CPU decides the printing interval Port 73 monitors the printhead temperature to protect the printhead If the temperature exceeds 95 C 213 F printing is stopped...

Page 73: ... Down 1 92 4400 W1 2 LQ 1 2 Draft and Copy and Power Down 2 3 61 1464 1 2 LQ and Copy 1 2 46 2200 W1 2 LQ and Power Down 1 3 31 1464 W1 2 LQ and Copy and Power Down 1 4 23 1100 W1 2 Raster Graphics The SLA7024M IC12 CR motor driver circuit detects and regulates the amount of current flowing in the carriage motor coil The current flowing through the coil varies depending on the speed of the CR moto...

Page 74: ...0 P71 11 P72 and 12 P73 Port 11 is the data output line used to save the information to the EEPROM and port 12 is the data input line used to read the saved data from the EEPROM Port 70 is the chip select line and port 71 is the clock timing line When the PWDN signal power down is detected on port 20 INTO the CPU writes the necessary data to the EEPROM before the 5 V line drops to 4 75 V CPU P70 P...

Page 75: ... by the printhead The rear PE sensor detects that paper has been loaded when the photo diode rays are cut off by the sensor plate which is included in the rear PE sensor The PW sensor used for paper width measurement and paper loading positioning detects the paper edge by comparing the voltage it measures with a standard voltage that was measured during the power on sequence Additionally as mentio...

Page 76: ...mbly 3 14 3 2 9 2 Removing the PG Sensor Assembly 3 15 3 2 9 3 Removing the Right Frame Assembly 3 16 3 2 9 4 Disassembling the Right Frame Assembly 3 16 3 2 9 5 Removing the Left Frame Assembly 3 19 3 2 9 6 Removing the Ribbon Drive RD Assembly 3 20 3 2 9 7 Removing the CR Assembly 3 21 3 2 9 8 Removing the Rear PE Sensor Assembly 3 23 3 2 9 9 Removing the Front PE Sensor Assembly 3 23 3 2 10 Rem...

Page 77: ...rs 2 3 18 Figure 3 23 Engaging the Tractor Clutch Cam 3 18 Figure 3 24 Removing the Left Frame Assembly 3 19 Figure 3 25 Removing the Driven Pulley Holder 3 20 Figure 3 26 Removing the RD Assembly 3 20 Figure 3 27 Engaging Gears for the RD Assembly 3 20 Figure 3 28 Disconnecting the FFC 3 21 Figure 3 29 Removing the CR Assembly 3 21 Figure 3 30 Inserting the Timing Belt 3 22 Figure 3 31 Inserting ...

Page 78: ... Removing the E ring and 2 CBS Screws 3 32 Figure 3 51 Removing the Paper Feed Roller Cover 3 32 List of Tables Table 3 1 Recommended Tools 3 1 Table 3 2 Equipment Required for Maintenance 3 1 Table 3 3 Inspection Check List for Repaired Printer 3 2 Table 3 4 Screw Types and Abbreviations 3 3 ...

Page 79: ...eration Use only recommended tools for maintenance work Use only recommended lubricants and adhesives see Chapter 6 Adjust the printer only in the manner described in this manual 3 1 2 Tools Tables 3 1 and 3 2 list the tools recommended for disassembling assembling or adjusting the printer Use only tools that meet these specifications Table 3 1 Recommended Tools Tool Part No Round nose pliers B740...

Page 80: ...necessary Paper path Is the type of paper in the printer feeding smoothly Checked Not necessary Is the tractor feeding the paper correctly Checked Not necessary Is the paper path clear of all obstructions Checked Not necessary Is the platen free of damage Checked Not necessary Ribbon mask Is the ribbon mask free of distortion Checked Not necessary Self test Was the self test successful Checked Not...

Page 81: ...ind head B tight screw CBS Cross recessed bind head S tight screw CBN Cross recessed bind head N tight screw CBC Cross recessed bind head C lamitite screw CBA Cross recessed bind head A lamitite screw CB O Cross recessed bind head with outside toothed lock washer Cross recessed head Bind Normal Top Side with Notch S tight B tight C lamitite A lamitite Pan Body Head Figure 3 1 Screw Types and Abbre...

Page 82: ...he flowchart below shows the order you need to use to disassemble the printer For details of the required adjustments refer to Chapter 4 START Disconnect power cord and I F cable Before Starting Disassembly Removing the Panel Board Assembly Removing the Printhead Removing the HP Sensor Removing the PW Sensor Removing the Platen Assembly Removing the Upper Housing Assembly Removing the CR Motor Ass...

Page 83: ...ont rear tractor assembly Ribbon cartridge Refer to the following figure Note Remove the paper eject cover and the front rear tractor assembly by pushing to release the hooks at both sides When remounting them be sure to snap the hooks on the projecting parts 2 5 8 3 1 3 4 6 7 Figure 3 3 Before Starting the Disassembly Procedure LQ 2070 Service Manual Disassembly and Assembly Rev A 3 5 ...

Page 84: ...ve the panel board assembly from the upper housing assembly Assembly Notes Before disconnecting the FFC from CN1 slide the lock cover for CN1 as shown in Figure 3 5 and release the FFC from CN1 After reconnecting the FFC for CN1 lock the lock cover The FFC must be connected properly as shown in Figure 3 5 Exposed terminals must be connected face upward against the C165 PNL board CN1 Figure 3 4 Rem...

Page 85: ...inthead and then disconnect the narrow FFC from the connector on the CR cover Assembly Notes The FFC must be connected properly as shown in the following figure The tightening torque for the 2 CBS screws 3 10 F Zn 0 59 0 78 Nm 6 8 Kg f cm Adjust the platen gap Refer to Chapter 4 CBSScrews 3X10F Zn Printhead Figure 3 6 Removing the Printhead Figure 3 7 Method for Connecting the Printhead FFC LQ 207...

Page 86: ... 3 2 5 Removing the PW Sensor Assembly 1 Remove the printer cover and ribbon cartridge see Section 3 2 1 2 Remove the CB screw 2 5 5 F Zn securing the PW sensor to the ribbon mask holder Then remove the FFC from the PW sensor connector mounted onto the CR cover 3 Remove the PW sensor assembly along with the CR cover by pushing and releasing the 2 clips for the CR cover as shown in the following fi...

Page 87: ...bnormal operations may occur such as printing on the platen surface The tightening torque for the CB screw 2 5 5 F Zn 0 08 0 12 Nm 0 8 0 12 Kg f cm When you replace the PW sensor assembly reset the TPE level Refer to Chapter 4 CB Screw 2 5X5 F Zn PW Sensor Assembly Ribbon Mask Holder View of PW Sensor through Ribbon Mask Holder Bold Perforated line is the Groove Micro Photo Sensor Figure 3 10 Moun...

Page 88: ...efore reinstalling the platen assembly into the printer mechanism move the printhead to the right edge of the CR shaft and set the release lever to the tractor position This pre assembly operation helps you mount the platen assembly more easily After installing the platen assembly into the printer mechanism make sure both locks for left and right bushings 8 mm are locked completely Be careful hand...

Page 89: ...er housing assembly 4 Remove the platen knob 5 Lift up the front side of the upper housing assembly by releasing 2 hooks from the holes located on right and left of the front bottom side 6 Remove the upper housing assembly Assembly Note The tightening torque for the CBB 4 14 F Zn 0 98 Nm 10 12 Kg cm Figure 3 14 Removing the Upper Housing Assembly Figure 3 13 Releasing the Upper Housing Assembly LQ...

Page 90: ...ngage the timing belt from the CR motor assembly 4 Remove 3 CBS screws 3 x 4 F Zn 2 CBB screws 3 x 12 F Zn securing the upper shield plate over the main board 5 Disconnect the cable for CN11 from the C186 MAIN board assembly 6 Remove the CR motor assembly from the printer mechanism Assembly Notes The tightening torque for the 2 CR mounting screws 0 78 0 98 Nm 8 10 Kg cm Adjust the bidirectional pr...

Page 91: ...N5 3 pin black CN6 2 pin white CN7 4 pin white FFC CN8 17 pin white FFC CN9 15 pin white FFC CN10 4 pin blue CN11 5 pin blue CN12 2 pin white CN13 2 pin black CN 16 2 pin yellow g Disconnect the cables for CN10 and CN11 after releasing the connector locks by pulling up 6 Remove the printer mechanism Assembly Notes Notice the connection for cables CN10 and CN11 and align the red colored cable to pi...

Page 92: ...connector CN10 from the C186 MAIN board assembly 6 Remove the PF motor from the right sub frame Assembly Note Before attaching the PF motor to the proper position on the right sub frame set the release lever to the full release position The CB screw 3 8 F Zn is used to secure the upper part of the PF motor The CBS screw 3 6 F Zn is used to secure the lower part of the PF motor The tightening torqu...

Page 93: ...on 3 2 7 3 Remove the printer mechanism see Section 3 2 9 4 Remove the hexagon nut standard M4 securing the PG sensor assembly to the right frame assembly Assembly Notes The tightening torque for the hexagon nut standard M4 1 18 1 37 Nm 12 14 Kg f cm When securing the shaft push the front CR guide shaft to the bottom of the cutout Hexagon Nut Standard M4 Figure 3 18 Removing the PG Sensor Assembly...

Page 94: ...ght frame assembly 6 Remove 2 CBS screws 3 6 F Zn securing the platen cover 7 Remove 3 CBS screws 3 6 F Zn securing the right frame assembly at the positions illustrated 8 Remove the right frame assembly Assembly Notes Adjust the platen gap and bidirectional print alignment Refer to Chapter 4 3 2 9 4 Disassembling the Right Sub Frame Assembly 1 Remove 1 CBS screw 3 6 F Zn and 1 CBS screw 3 8 F Zn ...

Page 95: ...30 mm 1 intermittent gear 1 spur gear 27 mm Assembly Notes Adjust the bidirectional print alignment Refer to Chapter 4 Mount the 11 parts above on the right frame assembly as shown in the following figures Spur Gear 21 mm Spur Gear 34 5 mm Combination Gear 8mm 30mm Intermittent Gear Spur Gear 27mm Spur Gear 34 5mm Spur Gear 34mm Compression Spring 200g Plain Wahser 8 2x0 5x1 5S Na Compression Spri...

Page 96: ...ce how the intermittent gear release lever and release lever transmission are engaged Pay attention to how the tractor clutch cam is engaged Refer to the following figure Assembly Note Be careful operating the release lever Frequent operation of the release lever back and forth without the upper housing cover may cause damage to the lever and dislocation of engagement Figure 3 22 Engaging Gears 2 ...

Page 97: ...ft frame 5 Remove 4 CBS screws 3 6 F Zn securing the left frame assembly 6 Disconnect a connector cable from the release lever sensor and then disconnect the connector cable from the HP sensor 7 Remove the left frame assembly Assembly Notes The tightening torque for the CBS screw 3 6 F Zn 0 78 0 98 Nm 8 10 Kg f cm The tightening torque for the hexagon nut standard M4 1 18 1 37 Nm 12 14 Kg f cm Adj...

Page 98: ...he front frame 8 Remove the timing belt from the RD assembly Assembly Notes Notice how the gears in the RD assembly are engaged Refer to the following figure The tightening torque for the CBS screw 3 8 F Zn 0 78 0 98 Nm 8 10 Kg f cm Adjust the platen gap and perform the bidirectional print alignment See Chapter 4 Driven Pulley Cover Shaft of Driven Pulley Assembly Timing Belt Left Frame Assembly C...

Page 99: ...y see Section 3 2 9 6 5 Disconnect 3 FFCs from the printhead and PW sensor assembly 6 Disengage the timing belt from the CR motor pinion gear 7 Remove the CR assembly from the rear front CR guide shaft 8 Remove the timing belt from the 2 holding slots under CR assembly 9 Remove the CR assembly Assembly Note Adjust the platen gap and the bidirectional print alignment Refer to Chapter 4 PW Sensor As...

Page 100: ... assembly be sure to reinstall the rear CR guide shaft in the printer mechanism The rear CR guide shaft has been drilled through the shaft near the right edge and one side of the hole has a chamfered edge This edge should be up Leaf Spring Bushing Oil Pads Carriage Assembly Figure 3 31 Installing the Oil Pads in the CR Assembly Timing Belt CR Assembly Figure 3 30 Inserting the Timing Belt Chamfere...

Page 101: ...other prying tool 6 Remove the rear PE sensor after disconnecting the connector 3 2 9 9 Removing the Front PE Sensor Assembly 1 Remove the rear front edge guide assembly front cover paper eject assembly rear front tractor unit and printer cover 2 Remove the panel board see Section 3 2 2 and upper housing assembly see Section 3 2 7 3 Remove the printer mechanism see Section 3 2 9 4 Turn the printer...

Page 102: ...crews 3 12 F Zn securing the upper connector cover 5 Remove 5 CBB screws 3 12 F Zn and 1 CBC lamitite screw 3 8 F Zn securing the C186 MAIN board assembly to the lower housing assembly 6 Remove the option I F cage from the C186 MAIN board by releasing the hooks fixing it to the C186 MAIN board 7 Remove the C186 MAIN board assembly Assembly Notes Notice the location of the CBC lamitite screw 3 8 F ...

Page 103: ...d assembly 5 Disconnect the cable for the fan motor from CN3 on the C166 PSB E board assembly 6 Remove the C166 PSB E board assembly while pulling up the fan motor Assembly Notes Insert the cable for CN2 C166 PSB E board assembly side under the fan motor The tightening torque for the CBB screw 3 12 F Zn 0 78 0 98 Nm 8 10 Kg f cm Notice the direction for mounting the fan motor Refer to the followin...

Page 104: ...k 1 Remove the CSF gear cover by pushing and releasing the 4 clips in the following figure 2 Remove the 3 CPB tight 3 12 screws securing the stepping motor to the right CSF frame 3 Disconnect connector CN1 from the CSF board assembly and then remove the stepping motor 4 Remove the CPB tight 3 12 screw securing the CSF board assembly and disconnect connector CN2 5 Remove the CSF board assembly by r...

Page 105: ...e 13 gears onto the right CSF frame Right CSF Frame Connector CN1 Connector CN2 Figure 3 39 Cable Alignment Gear 15 5mm Paper Eject Transmission Gear A Gears 10 mm CSF Planetary Lever Sub Assembly Gear 29 mm Driven Transmission Gear Gear 30 mm Combination Gear 20mm 33 5m m Paper Eject DrivenTransmission Gear Combination Gear 8 5mm 33mm CSF Planetary Lever Assembly Gear 18mm Gear 15mm Figure 3 40 E...

Page 106: ...from the right edge of the paper feed shaft 5 Remove the paper feed shaft by pulling it toward the right side 6 Remove the CPB tight 3 8 screw securing the paper support shaft to the right CSF frame as shown in the following figure Figure 3 41 Removing the E ring Gear 29 mm Paper Feed Shaft Figure 3 42 Removing 1 Gear 29 mm CPB tight Screw 3X8 Paper Support Shaft Figure 3 43 Removing the CBP Tight...

Page 107: ... support assembly 10 Remove the paper support shaft by pulling it toward the right or left side 11 Remove the paper holder spring Assembly Note Be sure to assemble the paper feed roller into the proper side The right and left rollers are not interchangeable Figure 3 44 Removing the Paper Support Block Assembly Paper Loading Roller Cover Paper Support Assembly Figure 3 45 Removing the Paper Loading...

Page 108: ...Figure 3 46 Removing the Paper Eject Assembly Cover Thin Plastic Film Figure 3 47 Assembling the Paper Eject Assembly Cover Disassembly and Assembly LQ 2070 Service Manual 3 30 Rev A ...

Page 109: ...y cover to the CSF unit pay attention to the position of 2 pieces of thin plastic film glued on the reverse side of the paper eject assembly cover as shown in the following figure Gear Train Cover Figure 3 48 Removing the Gear Train Cover Gear 22mm White Gear 22mm Combination Gear 25 mm 11mm CSF Planetary Lever Assembly CSF Transmission Gauge Spring Plain Washer Figure 3 49 Engaging 5 Gears LQ 207...

Page 110: ... the following 5 gears and 1 spring from the right CSF frame Assembly Note Pay attention how the 5 gears are engaged Refer to the following figure E ring CTPB Screw 3x8 Right CSF Frame Figure 3 50 Removing 1 E ring and 2 CTBS Screws Right CSF Roller Cover Left CSF Roller Cover Figure 3 51 Removing the CSF Roller Cover Disassembly and Assembly LQ 2070 Service Manual 3 32 Rev A ...

Page 111: ...mblies by pulling them toward the right or left side 5 Remove both paper feed rollers from the paper support assemblies 6 Remove both CSF roller covers by releasing the clips fixing them to the paper support assemblies 7 Remove the paper support shaft by pulling out it toward the right or left side 8 Remove the paper holder and then remove the paper holder spring Assembly Note Be careful to assemb...

Page 112: ...Disassembly and Assembly LQ 2070 Service Manual 3 34 Rev A ...

Page 113: ...ibbon Mask 4 2 Figure 4 2 Setting Position for PG Adjust Lever 4 2 Figure 4 3 Platen Gap 4 3 Figure 4 4 Adjusting the Parallelism of the CR Guide Shaft 4 3 Figure 4 5 Machine Select Menu 4 4 Figure 4 6 Factory Setting File Menu 4 4 Figure 4 7 Main Menu 4 4 Figure 4 8 Bidirectional Adjustment Menu 4 5 Figure 4 9 Current Bi d Print Alignment 4 5 Figure 4 10 Guide Sheet for Bi d Adjustment 4 6 Figure...

Page 114: ...embled use the Check Program included on the Settings Diskette and check the performance and settings of various check patterns 4 1 2 Required Adjustment Tools The following table shows the tools required for each adjustment Table 4 2 Required Adjustment Tools Adjustment Required Tool Page Platen Gap Thickness Gauge B776702201 4 2 Bi d Print Alignment Settings Diskette 1 or Remote Utility or Panel...

Page 115: ...the CR assembly again tightening the 2 CBS screws 3 10 F Zn 4 Move the printhead to 5th column position 5 Set the release lever to the FRICTION position 6 Set the PG adjust lever to the second slot from rear of the printer mechanism as shown in the following illustration 7 Loosen the hexagon nut standard M4 securing the PG adjust lever while setting the PG adjust lever to the second slot position ...

Page 116: ... backward If the platen gap is more narrow for the 5th column than the 130th column adjust the parallelism of the CR guide shaft by moving the parallelism adjustment bushing forward Refer to the following figure 12 Continue performing adjustment steps 8 to 11 until the platen gap is correct at all 3 positions After completing the adjustment remove the screwdriver from the rear CR guide shaft 13 Af...

Page 117: ...ram First the program displays Machine Select Menu 4 Highlight 24 pins by moving the cursor with or key and select it by pressing ENTER 5 After you select 24 pins you see the following menu 6 In this menu highlight the factory settings for the printer s destination by moving the cursor with the or key and select the destination factory settings by pressing ENTER 7 After you select the factory sett...

Page 118: ...PACE Perform this operation for each mode 1 2 and 4 12 When the Bi d print alignment is correct for each print mode press ENTER to write the adjusted values to the EEPROM and print the adjusted value for each mode This operation returns the program to the Main Menu automatically 13 To exit this program press ESC until the computer returns to the MS DOS prompt Note The factory settings are written ...

Page 119: ...n Draft Copy mode 7 After you perform steps 3 to 5 above for Draft Copy mode go back to step 3 to adjust NLQ mode 8 When you have made your last selection in NLQ mode turn the printer off to finish the adjustment To adjust your printer follow these steps 1 Look for the alignment pattern that is most closely alignment and press the LF FF or the Load Eject button until the lights indicate the approp...

Page 120: ...t it by pressing ENTER 5 After you select 24 pins the Setting File menu is shown 6 In this menu highlight the destination factory settings by moving the cursor with or key and select the destination factory settings by pressing ENTER 7 After you select the factory settings the program displays the Main Menu 8 In this menu select Check Pro FF in the Main Menu and run the Check Pro FF to write the s...

Page 121: ...lect Menu is displayed 4 In this menu highlight 24 pins by moving the cursor with or key and select it by pressing ENTER 5 After you select 24 pins the Setting File menu is displayed 6 In this menu highlight the destination factory settings by moving the cursor with or key and select the factory settings by pressing ENTER 7 After you select the factory settings the Main Menu is displayed 8 In this...

Page 122: ...15 List of Figures Figure 5 1 Printhead Connector Pin Alignment 5 1 Figure 5 2 Flowchart 1 5 5 Figure 5 3 Flowchart 2 5 6 Figure 5 4 Flowchart 2 1 5 7 Figure 5 5 Flowchart 3 5 8 Figure 5 6 Flowchart 4 5 9 List of Tables Table 5 1 Printhead Coil Resistance Test Points 5 1 Table 5 2 Sensor Test Points 5 2 Table 5 3 Motor Test Points 5 3 Table 5 4 Indicators and Buzzer 5 3 Table 5 5 Symptoms and Prob...

Page 123: ...ance Test Points Common Pin No Test Pin No Test Method Set meter to ohms Disconnect the printhead after the printer is powered off Meter Reading Refer to the following figure Refer to the following figure Place one lead on each pin and the other lead on each common pin 39 3 10 Ω at 25 C 77 F R F R F COM C 1 C 3 1 8 16 24 Pin No T Thermistor terminal C1 C6 Common terminal 1 24 Wire number 3 1 1 C 5...

Page 124: ...ling the sensor lever Open 5 V Paper loaded Short 0 V No paper 2 GND CN13 PG Sensors 1 PG 1 Place one lead on pin 1 and the other lead on pin 2 and check the voltage while toggling the sensor lever Open 5 V Short 0 V 2 GND CN12 Release Sensor 1 1 Release 1 Place one lead on pin1 and other lead on pin 2 and chaeck the voltage while toggling the sensor lever Open 5V Short 0V 2 GND CN16 Release Sneso...

Page 125: ...nd other lead on pin 3 Place one lead on pin 2 and other lead on pin 4 16 Ω 10 at 25 C 77 F 5 2 4 Error Codes with Indicators and Buzzer Table 5 4 Indicators and Buzzer Error Condition Indicator Buzzer 1 Pause Paper Out Tear Off Bin Condensed Font Paper Out On On 3 Paper Jam On Blinks 5 Head Hot Blinks Release Lever Error On Blinks 5 Fatal Error Blinks Blinks Blinks Blinks Blinks 5 1 indicates tha...

Page 126: ...en the printer is powered on the CR moves away from home position after a moment and stops All indicator LEDs on the control panel blink Flowchart 1 Abnormal Paper Feed Paper does not feed at all When the printer is powered on paper is ejected automatically When paper is loaded it is ejected automatically and then the printer indicates Ready Flowchart 2 Flowchart 2 1 Abnormal Control Panel Operati...

Page 127: ... it OK Replace the C186 MAIN Board Replace the CR motor END When you move the CR manually wih the power off dose it move freely Is the platen gap adjusted properly Is the problem corrected YES Is CN4 connected correctly END Dose the HP sensor work correctly See Table 5 2 Is the problem corrected Is the problem corrected END NO Is the resistance for the CR motor correct See table 5 3 Replace the C1...

Page 128: ...stuck to the surface of the PW sensor Remove the substance blocking the sensor Is something jammed between the front rear PE sensor and the platen Dose the sensor operated correctly Is the problem corrected No YES END Replace the sensor Is the problem corrected END Replace the C186 MAIN board No No YES YES Clean the jam Is the problem corrected END YES YES No YES YES Are CN5 and CN6 connected corr...

Page 129: ...ected correctly or CN16 Is the FFC cable OK NO Replace the cable Y E S Y E S EN D Is the problem corrected Dose the PWsensor work correctly See Table 5 2 Replace the cable EN D Is the problem corrected YES YES Y E S NO NO Replace the C186 MAIN baord EN D Dose the release sensor operated correctly See table 5 2 Replace the C186 MAIN baord EN D Is the problem corrected END NO YES Replace the sensor ...

Page 130: ...s it OK Replace the FFC END Is the problem corrected YES YES N O N O N O YES Replace the C186 MAIN board END Check the Operate button on the control panel using a mutometer Is the Operate button OK Is the FFC connected correctly Replace the PNL board Is the problem corrected END YES Connected the cable correctly Is the problem corrected END Connected the cable correctly Is the problem corrected EN...

Page 131: ...eck the FFC using a multimeter Is it OK NO YES YES NO NO NO NO YES YES NO YES NO YES YES Replace the C186 MAIN baord END END END END END Replace the FFC Is the problem corrected NO NO YES END END Reinstall the Ribbon mask Is the problem corrected NO YES END END NO YES NO Date received from the host is not printed correctly Are printer settings correct YES Are the correct printer drivers installed ...

Page 132: ...the U S can ignore this section WARNING The OPERATE switch on the control panel only turns the secondary power circuit on or off so the primary circuit is live as long as the printer is connected to an AC power outlet Before you repair or touch the power supply board be sure to disconnect the AC power outlet Table 5 6 Repairing the C166 PSB PSE Board Assembly Problem Cause Checkpoint Solution The ...

Page 133: ... the source and drain is infinite Check the voltage waveform between the source and drain of the Q1 Replace the Q1 PC1 is dead Check the voltage waveform between pins 3 and 4 of the PC1 Replace PC1 LQ 2070 Service Manual Troubleshooting Rev A 5 11 ...

Page 134: ...e Q31 The 5 V line is not output IC51 is dead Check the voltage waveform at pin 8 of IC51 The voltage waveform is as follows Check the voltage at pin 12 of IC51 Replace IC51 Q51 is dead Check the voltage waveform between emitter and collector of Q51 Replace Q51 L51 is short Check the resistance between both terminals of L51 Replace L51 The PWDN signal is constantly HIGH IC52 is dead Check whether ...

Page 135: ...g all servicers in the U S can ignore this section Table 5 7 Repairing the C186 MAIN Board Assembly Problem Cause Checkpoint Solution The printer does not operate at all Reset IC10 is defective Check the voltage waveforms of the VCC signal CH1 IC10 pin 3 and VOUT signal CH2 IC10 pin 1 when power is turned on Replace IC10 The PROM IC3 is not selected Check for a change in the signal from HIGH LOW a...

Page 136: ...arriage operation is abnormal IC12 or IC1 is defective Check input signal waveform CH1 at pins 6 5 17 and 16 of IC1 Check output signal waveform CH2 at pins 8 1 18 and 11 of IC12 If the input signal is not correct replace IC1 or replace the main board If the output signal is not correct replace IC12 IC1 is defective Check the output signal at pins 32 33 34 35 of IC1 If there is no output signal re...

Page 137: ...is not correct replace the IC11 No data is printed IC1 is defective Check the output signal waveform at pin 15 of IC1 If this signal is not output replace IC1 or replace the main board A particular dot fails to print IC2 is defective or One of the head drive transistors is defective Q1 Q24 Check the voltage waveform CH1 at pin 69 and pins 76 89 pins 91 99 of IC2 Check the voltage waveform CH2 for ...

Page 138: ...d on the CR motor does not rotate all and all indicators blink CN11 is disconnected from the main board Check CN11 Connect CN11 correctly The CR motor can be rotated when the printer is powered on But the CR does not move The timing belt came off the pinon gear of the CR motor Check the engagement of the timing belt Reinstall the timing belt correctly The CR moves slightly and then stops and all i...

Page 139: ...nthead FFC The printer does not print a particular dot The printhead is defective Measure the coil resistance of the printhead The resistance should be approximately 39 3 ohms Refer to page 5 1 Replace the printhead The printhead FFC is disconnected or there is no continuity Check the continuity in the FFC Replace the printhead FFC Printing is uneven on both edges of the column Platen parallelism ...

Page 140: ...the operation of the PW sensor Refer to page 5 2 Replace the PW sensor Refer to page 3 9 When the printer is powered on paper is ejected automatically and then the printer signals a paper end error on the friction mode A foreign object is jammed between the platen and rear front PE sensor Remove the platen and check the paper path Refer to page 3 10 Remove the platen and remove any foreign object ...

Page 141: ... The ribbon cartridge is defective Remove the ribbon cartridge Then rotate the ribbon feed roller manually to check that the ribbon cartridge feeds the ribbon normally Replace the ribbon cartridge Foreign substances are caught in the gears of the RD assembly Check that the ribbon driving gear rotates properly when the carriage is moved manually Remove any foreign substances or replace the RD assem...

Page 142: ...CATION 6 1 List of Figures Figure 6 1 Lubrication Points 1 and 3 6 2 Figure 6 2 Lubrication Point 2 6 2 Figure 6 3 Lubrication Point 4 6 3 Figure 6 4 Lubrication Points 5 6 and 7 6 3 Figure 6 5 Lubrication Point 8 6 3 List of Tables Table 6 1 Lubrication 6 1 Table 6 2 Lubrication Points 6 1 ...

Page 143: ...ace to be lubricated is clean Do not apply too much lubricant as this may damage nearby parts Table 6 1 Lubrication Type Name Quantity Availability Part No Grease G 26 40 gm EPSON B702600001 Oil O 2 40 cc EPSON B703700001 Table 6 2 Lubrication Points Ref No Lubrication Points Quantity Lubricant 1 Cam surface on the 34 5 mm spur gear 2 mm width halfway G 26 2 The platen gap adjustment slots on the ...

Page 144: ...int Ref No 1 Lubrication Point Ref No 3 Figure 6 1 Lubrication Points 1 and 3 Platen Gap Adjustment Slot Gap Adjust Lever Lubricate all these slots Lubrication Point Ref No 2 Figure 6 2 Lublication Point 2 Maintenance LQ 2070 Service Manual 6 2 Rev A ...

Page 145: ... 4 Lubrication Point Ref No 6 1 Lubrication Point Ref No 6 2 Lubrication Point Ref No 5 Lubrication Point Ref No 7 Figure 6 4 Lubrication Points 5 6 and 7 Lubrication Point Ref No 8 Figure 6 5 Lubrication Points 8 LQ 2070 Service Manual Maintenance Rev A 6 3 ...

Page 146: ...Maintenance LQ 2070 Service Manual 6 4 Rev A ...

Page 147: ... 20 Figure A 9 LQ 2070 Exploded Diagrams 2 A 21 Figure A 10 LQ 2070 Exploded Diagrams 3 A 22 Figure A 11 CSF Bin 1 Exploded Diagrams 1 A 23 Figure A 12 CSF Bin 1 Exploded Diagrams 2 A 24 Figure A 13 CSF Bin 2 Exploded Diagrams A 25 List of Tables Table A 1 Connector Summary A 6 Table A 2 Connector Pin Assignments CN3 A 6 Table A 3 Connector Pin Assignments CN4 A 6 Table A 4 Connector Pin Assignmen...

Page 148: ...Table A 15 Connector Pin Assignments CN16 A 9 Table A 16 Parts Comparison Between LQ2070 LQ2170 and FX2170 A 10 Table A 17 Parts List A 26 ...

Page 149: ...ge dl 00H dl 7FH 3 Write Data to Specific EEPROM Address Format 1B 7C 00 05 00 04 FB 02 in hex dl d2 Parameters dl EEPROM address d2 Byte of data to be written Range d1 00H dl 7FH d2 00H d2 FFH Will not accept addresses 00Hor 02H 4 Set Print Mode Format 1B 7C 00 04 00 03 FC 81 in hex dl Parameter dl Print speed bit 0 Reserved bit 1 Reserved bit 2 Head cold mode 1 not fixed 0 bit 3 Reserved bit 4 T...

Page 150: ...8 5 mm 0EH 0FH TOF adjustment value for front tractor 60 to 360 4 2 mm to 8 5 mm 1 inch in units of 1 360 inch 0000H 8 5 mm 10H 11H TOF adjustment value for front CSF bin1 60 to 360 4 2 mm to 8 5 mm 1 inch in units of 1 360 inch 0000H 8 5 mm 12H 13H TOF adjustment value for front CSF bin2 60 to 360 4 2 mm to 8 5 mm 1 inch in units of 1 360 inch 0000H 8 5 mm 14H 15H TOF adjustment value for rear ma...

Page 151: ...M IBM 0 Off 1 On b6 Reserved b7 Reserved 00H 24H 25H Tear Off adjustment 128 to 127 in units of 1 360 inch 0000H 26H Other font selection 0 Roman T 1 Sans Serif H 2 OCR B 3 Orator 4 Orator S 5 Script C 00H 27H Backup flags 1 Copy mode 00H 28H Backup flags 2 In tear off state Bin select b0 Friction Bin 1 or Tractor not Tear Off b1 Friction Bin 1 b2 Friction Bin 2 b3 Friction Card Stock b4 Tractor a...

Page 152: ... 09H 000000H Standard 67H Reserved 00H Area 2 68H Market 0 Standard version 1 NLSP version 00H 69H to 70H IBM charactor table 0 Table2 1 Table1 00H 71H Checksum of Area 2 68 70H 00H Area 3 72H Vp adjustment value a 73H Vp adjustment value complement of 72H a 74H Bi d adjustment value for high speed draft draft mode 12 to 12 in units of 1 720 inch 00H 75 H Bi d adjustment value for draft copy mode ...

Page 153: ...r Release Lever Position Sensor PE Rear Sensor PE Front Sensor HP Sensor PW Sensor Printhead Board Assy C186 MAIN CN13 CN5 CN6 CN4 Board Assy C166 PSB PSE CN3 CN12 CN7 CN8 CN9 PF Motor CR Motor CN11 CN10 CN15 Board Assy C165PNL CN14 CSF Bin 1 CN1 Host Computer Parallel I F CN2 Option I F CN16 CN1 Figure A 1 Cable Connections LQ 2070 Service Manual Appendix Rev A A 5 ...

Page 154: ... assembly 22 CN16 Release lever position sensor 2 Table A 2 Connector Pin Assignments CN3 Pin I O Signal Name Function 1 GP 2 GP 3 I 35V 35 VDC line 4 I 35V 35 VDC line 5 GND 6 GND 7 I 5V 5VDC line 8 I 5V 5VDC line 9 I PWDN 35 V line overload section signal 10 O PSC Power on off switch signal Table A 3 Connector Pin Assignments CN4 Pin I O Signal Name Function 1 I HP CR home position signal 2 GND ...

Page 155: ...Connector Pin Assignments CN8 Pin I O Signal Name Function 1 O HD5 Head Data 5 2 O HD1 Head data 1 3 O HD13 Head data 13 4 O HD 9 Head data 9 5 O HD21 Head data 21 6 O HD17 Head data 17 7 35V 35 VDC line 8 35V 35 VDC line 9 O 35V 35 VDC line 10 O HD24 Head data 24 11 O HD20 Head data 20 12 O HD12 Head data 12 13 O HD 8 Head data 8 14 O HD16 Head data 16 15 I HTMP Head temperature signal 16 I 5V 5V...

Page 156: ...10 Pin I O Signal Name Function 1 O PF A PF motor phase A 2 O PF B PF motor phase B 3 O PF A PF motor phase A 4 O PF B PF motor phase B Table A 10 Connector Pin Assignments CN11 Pin I O Signal Name Function 1 O CR A CR motor phase A 2 O CR A CR motor phase A 3 O CR B CR motor phase B 4 O CR B CR motor phase B 5 O CR COM CR motor common Table A 11 Connector Pin Assignments CN12 Pin I O Signal Name ...

Page 157: ...5 O RESRVL Pitch select LED 6 I PAUSSW Pause button signal 7 O TBIN2L Tear off bin select LED 8 O TBIN1L Tear off bin select LED 9 O PITC2L Pitch select LED 10 O PITC1L Pitch select LED 11 FONT3L Not connected 12 O FONT2L Font LED 13 O FONT1L Font LED 14 GND Signal GND 15 GND Signal GND 16 I FONTSW Font button signal 17 I PITCSW Pitch button signal 18 I TBINSW Tear off bin signal 19 I PSC Operate ...

Page 158: ...oard C186 C165 C165 PSB PSE Board C166 C165 C165 Cover Open Sensor X O O PG sensors 1 1 2 Release Lever Sensors Located at both sides 2 on left side 2 on left side CR Motor EM 248 AM0083 EM 241 EM 241 PF Motor EM 247 EM 242 EM 247 EM 243 EM 249 O Available X Not available Appendix LQ 2070 Service Manual A 10 Rev A ...

Page 159: ...Grounding Plate I F 114 Front Cover Stopper Stopper Cover Front 115 Cover Compression Spring Cover Compression Spring 116 Sensor Holder Holder Detector 117 I F Board Guide Guide I F Board 118 Compression Spring 2 94 Compression Spring 2 94 119 Case Open Sensor Assembly Detector Assy Case Open 120 Logo Plate Logo Plate 121 C B B Screw M4x14 C B B Screw M3x8 122 C B C Lamitite M3x8 C B C Lamititie M...

Page 160: ...400 Power Supply Cable Power Cable For EHK 400 Power Supply Cable AC Cable For EAL 400 Power Supply Cable Power Cable Assy For USA 450 Panel Board Assembly Board Assy Panel 500 Printer Mechanism Printer Mechanism ASP 501 Right Frame Assembly Frame Assy Right 502 Left Frame Assembly Frame Assy Left 503 CR Motor Motor CR 504 Ribbon Drive Assembly RD Assy 511 PF Motor Motor PF 521 PG Sensor Connector...

Page 161: ...me TR Right 548 Left Tractor Rear Lever Lever TR Left Rear 549 Right Tractor Rear Lever Lever TR Right Rear 550 Paper Support Paper Support 551 Supur Gear 20mm Spur Gear 20 552 Extension Spring 15 7 Extension Spring 15 7 555 Paper Eject Assembly Paper Eject Assy 556 Paper Eject Cover Cover Paper Eject 557 Paper Eject Base Frame Frame Paper Eject Base 558 Paper Eject Left Frame Frame Paper Eject Le...

Page 162: ...Lever Gap Adjust 585 PG Adjust Lever Cap Cap Lever 586 Release Sheet Cap Sheet Release Cap 587 CR Motor Mounting Plate Mounting Plate Motor CR 588 Ribbon Mask Holder Holder Ribbon Mask 589 Lower Oil Pad Oil Pad Lower 590 Release Lever Lever Release 591 Tractor Cam Clutch Cam Clutch Tractor 592 Base Rubber Base Rubber 593 Combination Gear 8 30 Combination Gear 8 30 594 Spur Gear 27mm Spur Gear 27 5...

Page 163: ... PE Rear 621 Front Tractor Assembly Tractor Assy Front 622 Left Tractor Frame Frame TR Left 623 Right Tractor Frame Frame TR Right 624 Left Tractor Front Lever Lever TR Left Front 625 Right Tractor Front Lever Lever TR Right Front 626 Torsion Spring 0 26g Torsion Spring 0 26 627 Paper Eject Driven Holder Holder Paper Eject Driven 628 Compression Spring 1 08g Cmpression Spring 1 08 629 Paper Eject ...

Page 164: ...scription Parts Price List Name 641 C B S Screw C B S Screw 642 C F P Tite Screw 2 6 X 8 F Zn C F P Tite Screw 2 6X8 F Zn 643 Hexagon Nut Hexagon Nut 644 C B S Screw C B S Screw 650 Print Head Print Head DH24 0A 0 LQ 2070 Service Manual Appendix Rev A A 31 ...

Page 165: ...EPSON ...

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