Страница 1: ...TECHNICAL MANUAL TROUBLESHOOTING EPSON 08290002 0 ...
Страница 2: ...d through Service Bulletins and the Technical Manual should be revised accordingly The details of the Manual are subject to change withOl t notice All the information given in the Manual concerns the QX 1 0 to others All rights reserved No part of this publication may be reproduced stored in a retrieval system or trans mitted in any form or by any means electronic mechanical photocopying recording...
Страница 3: ...CONTENTS CHAPTER 1 GENERAL CHAPTER 2 DiSASSEMBLY AND REASSEMBLY CHAPTER 3 ADJUSTMENT AND MAINTENANCE CHAPTER 4 REPAIRS CHAPTER 5 TROUBLESHOOTING ...
Страница 4: ...TER 1 GENERAL CONTENTS 1 1 Features 1 1 1 2 Hardware Configuration 1 1 1 2 1 General 1 1 1 2 2 Hardware 1 1 1 3 Specifications 1 2 1 3 1 External Dimensions and Weight 1 2 1 3 2 Environmental Conditions 1 2 ...
Страница 5: ... The main system unit the heart of the QX 10 system includes the main circuit board sub circuit board power supply two 5 1 4 floppy disk drives developed by Epson and five slots permitting in stallation of optional cards The keyboard unit is connected to the main system unit with a curled cord through which signals may be transmitted in any direction The standard monitor unit is a 12 high resoluti...
Страница 6: ... x x x 1 Temperature during operation storage 2 Humidity during operation storage 3 Resistance to shock during operation storage 4 Resistance to vibration during operation storage MainSY 0 340 340 224 80 H x 103 mm x 270 mm x 48 mm mm 5 C to 40 C 30 C to 70 C 20 80 no condensation 10 90 no condensation max 1 G 1 msec max 5 G 1 msec max 0 25 G 5 50 Hz max 3 G 5 50Hz Greeninitor unit Fig 1 1 Hardwar...
Страница 7: ...Q10GMS Board uP0765 Channel A MPD7210 AC Q10PS Channel B IN board JLPD8255 Fig 1 2 Block diagram of main component 1 3 U9h8 CRT FOO SO 321 Keyboard RS 232C Printer centronics type Open card ...
Страница 8: ...r 7201C 1 Allocates channel a to the keyboard and B to RS 232C and controls serial data transfer with CPU Printer controller 8255AC 1 Provided with an 8 bit parallel port Acts as an interface with printer conformable to Centronix Real time clock 46818P 1 Provided with clock and calendar functions Floppy disk controller 765AC 1 Interface with FOO SO 321 I O selector LS154 1 Accesses each I O point ...
Страница 9: ...rrupt Controller 4 8253C Programmable Interval Timer 5 7201 C Multi protcol Serial Controller 6 8255AC Programmable peripheral Interface 7 46818P Real time clock plus RAM 8 765AC Programmable Floppy Disk Controller 9 LS154 I O Selector 10 416 4164 D RAM 11 2716 32 04 P ROM for IPL 12 449 C MOS RAM 1 5 ...
Страница 10: ...troller Video RAM Character generator Model Q ty Function 7220 1 A display controller with high speed drawing and magnifying functions 416 4164 16 Dynamic RAM is used 2732 64 1 ROM storing display fonts to be sent to the dis play unit Table 1 2 Primary configuration of Q1 0 GMS Fig 1 4 1 7220 Graphic Display Controller 2 V RAM 16 64 k bit dynamic RAM 3 P ROM Character Generator 1 6 ...
Страница 11: ...oltage Output voltage 5 12 C 12 F 12 L 12 100V 10 120V 10 200V channel 220V 10 240V 10 50 60 Hz Approx 75W 30A for 20 ms maximum 1 rnA maximum 1OOV channel Can withstand 1 kV applied between AC power supply and case for 1 minute 200V channel Can withstand 1 25 kV applied between AC power supply and case for 1 minute 10 M Q for 500V DC minimum Limits of output Standard USE voltage current 5 0 5 1 V...
Страница 12: ...Flyback transformer FBT 5 CRT drive unit CDU 1 Pin Definition Pin No Function 1 Video signal 2 Vertical synchronizing signal 3 Horizontal synchronizing signal 4 Power supply 12V DC 5 Grounding power supply horizontal 6 Grounding video vertical 7 Grounding power supply horizontal 8 Frame grounding Table 1 4 E Frame ground 7 Ground power hor 3 Horizontal sync 5 Ground power hor Fig 1 7 1 8 6 Ground ...
Страница 13: ...l input impedance 500amin 5 Vertical driving signal 6 Vertical input impedance 3 Input signal timing a Horizontal driving signal 19 3 kHz Video signal b Vertical driving signal 45 8 Hz Video signal c Video signal TTL positive l 0 0 8 V 3 0 kamin H 2 4 5 5V nt In _ I I t 1 44 AS 51 84 uS 13 44 u 38 40 u Fig 1 9 ____ Il __ rl l I 0 83 mS 1 09 mS 21 83 mS 20 74mS Fig 1 10 Fig 1 11 1 9 Dot clock 16 66...
Страница 14: ...n CPU Data transfer is made with the main system unit in the start stop turning system at the rate of 1200 BPS Pin Definition Pin No 1 2 3 4 5 6 7 8 Fig 1 12 1 Keyboard controller uPD8049 2 Key scan signal decoder LS145 Signal Direction Description of Signal OUT Received data OUT Clock 1200 BPS OUT 12 V IN Transmitted data Ground Ground Ground Ground Note The direction of signal is as viewed from ...
Страница 15: ...21 has the features as described below 1 SO 321 produces an ultra thin structure of 1 2 1 3 the convertional models 2 In order to miniaturize the circuit board and get high reliability most of the control circuit is integrated to two lSls Fig 1 14 1 Head pad 2 VCM 3 Drive motor 4 Main PCB 1 11 ...
Страница 16: ...ent conditions 1 Temperature 2 Relative humidity 3 Maximum wet bulb temperature 4 Vibration 17 Transportation and storage condition 1 Temperature 2 Relative humidity 3 Vibration 4 Impact 500 k byte Double density recording 328 k byte Double density recording 5876 BPI Double density recording 250 k bit sec Double density recording 100 msec 15 msec 220 msec 15 msec 0 5 sec 300 rpm 1 12 48TPI 80 36 5...
Страница 17: ...r consumption 9 7 W typ 20 Reliability 1 MTBF 1000 HOURS POH 2 MTIR 30 minutes 3 Soft error rate less than once every 10 9 bits 4 Hard error rate less than once every 10 12 bits 5 Seek error rate less than once every 10 6 seeks 21 Connectors 1 Power supply connector AMP PIN 1 480424 0 or equivalent 2 Signal connector 3 M PIN 3463 0001 or equivalent 1 13 ...
Страница 18: ... 3 3 Board CRT drive unit 2 11 2 4 Disassembly and reassembly of the keyboard unit 2 1 2 2 4 1 Cover 2 1 2 2 4 2 Replacement of key switches and LED lamps 2 1 3 2 5 SO 321 mechanism 2 14 2 5 1 Main board set 00 2 14 2 5 2 Voice coil motor unit VCM unit 2 16 2 5 3 Sub frame collet set collet lever and pad arm 2 18 2 5 4 Front panel 2 20 2 5 5 Disk guide L unit write protector set and eject transmis...
Страница 19: ...andled be sure to touch a grounded device with your hands to discharge static electricity prior to handling 6 Be sure to use the specified screws See Table 2 1 7 Do not touch the contact surfaces of connectors with bare hands 8 When the Q 10 SYM substrate is removed or transported disconnect the battery connector CN 12 Abbreviations for screws and small parts Abbrevia Name Rough Sketc h tion CS Cu...
Страница 20: ...d of the upper case top with a screwdriver 4 Remove the the four set screws of the upper case shown in Fig 2 3 CS M4 x 12 x 4 5 Remove the two connectors shown in Fig 2 4 CN6 and CN7 on the Q1 0 SYM substrate 2 2 Notes on disassembly r OI ticmaJ cover Fig 2 1 To replace connector cap A first replace the op tional cover and hen insert the lower part of con nector cap A into the groove of the lower ...
Страница 21: ...ect the grounding wire CTC M3 x 12 x 1 Carry out above procedure in reverse for reassembly 2 3 Notes on disassembly The CN6 us 1 Upper case lock type and should be removed by opening left and right levers When replacing make sure the cables of CN7 and CN7 are not trapped by the case or Q10 GMS board Lower case Groundi wire Upper 1 1 1 Fig 2 5 Fig 2 6 When replacing make sure the cables of CN7 and ...
Страница 22: ...x3 HN M3 x3 CPO Grounding plate C _ I ___ __ O hieldin g plate MINN QW GMS o D HN Fig 2 9 Carry out above procedure in reverse for reassem bly 2 4 Notes on disassembly Before handling the board be sure to discharge the static electricity from your body To replace the board set connectors CN9 and CN10 correctly and securely in the 01 0 SYM board When replacing the board pay attention to the dir ect...
Страница 23: ...ws provided on the left and right sides of the board 5 Take off the board Carry out above procedure in reverse for reassem bly 2 5 Notes on disassembly Fig 2 10 The tightening torque of the screws is 5 kg m Note The connector for connection between CN 12 and battery must also be removed when the board itself is transported to prevent sh rting of the battery Before holding the board be sure to disc...
Страница 24: ...ft the power supply unit and take it off Carry out above procedure in reverse for reassem bly 2 6 Notes on disassembly Insulating paper A Fig 2 11 To replace the grounding plate pay attention to the direction with the tooth tip facing up and left In the part A shown in Fig 2 11 attach screws grounding wire press terminal and toothed washer in that order CS Grounding terminal _oe od Ow Fig 2 12 Whe...
Страница 25: ...front side Carry out above procedure in reverse for reassem bly 2 7 Notes on disassembly Il A J BJlo E 1 i1 I ii Grounding plate B FDD A FDD B c iJ Fig 2 13 The lead of the grounding wire of screw A should be attached in the direction shown in Fig 2 13 Grounding plate B is mounted like a wave When a defective FDD is replaced make secure setting of the following DIP switch and mounting of the termi...
Страница 26: ... the solder of A and K shown in Fig 2 16 and remove the LED lamp 4 The pole with the longer lead wire as shown in Fig 2 1 7 is the anode of the LED lamp Insert the lamp into the TFLD board shown in Fig 2 16 in the correct direction ensuring close con tact 5 Solder the lamp 6 Tighten the two screws mentioned in step 2 2 8 Notes on disassembly POWER LAMP LED I Fig 2 15 roo o o i i Upper case L ED TF...
Страница 27: ... the unit with the CRT screen down 2 Remove the four screws indicated by arrows in Fig 2 18 CTBR M4 x 16 x 4 3 Lift the cover Carry out above procedure in reverse for reassem bly 2 9 Notes on disassembly There are many high voltage parts in the green monitor Be careful not to touch them l Fig 2 18 ...
Страница 28: ...ors 2 coming from the DY deflection yoke shown in Fig 2 19 from the board 3 Disconnect the grounding wire connector coming from the middle of the wire which makes connec tion between the CRT fixing screws 2 and 3 from the board 4 Remove the socket shown in Fig 2 19 5 Remove four screws 1 4 shown in fig 2 19 CTC M4xl16 x4 OW M4 x2 PW M4 x 0 8 x 16 x 2 Carry out above procedure in reverse for reasse...
Страница 29: ...ard CRT drive unit Disassembly procedure Notes oil disassembly 1 Carry out steps 1 4 of 2 3 2 High voltage is applied to the board Keep in mind and take care 2 Remove screws 1 4 shown in Fig 2 21 Fig 2 21 2 11 ...
Страница 30: ...keyboard unit 2 4 1 Cover Disassembly procedure 1 Set the unit with the key top down 2 Remove the six screws shown in Fig 2 21 CTC M4 x 12 x 4 3 Remove upper and lower cases and take off the keyboard unit 2 12 Notes on disassembly Fig 2 22 ...
Страница 31: ...emove all the the screws cup and tapping screws on the soldered surface of the keyboa d unit 2 Lift the unit straight up holding part Fig 2 23 with the ke l top up shown in Fig 2 23 3 Key switch Desolder the defective key switch and replace it LED lamp Desolder the defective LED and replace it Carry out above procedure in reverse for reassem bly 2 13 Notes on disassembly ...
Страница 32: ...24 A Front panel CTC M2 5 x 6 B Disk guide R CTC M2 5 x 6 C Disk drive motor CS M2 5 x 4 0 Radiator plate CS M2 5 x 25 2 lift the main board so that it is almost parallel to the main frame 3 Disconnect the connector of the head lead wire See Fig 2 25 D Fig 2 24 2 14 Notes on disassembly QOQ liDO I I I 1 Fig 2 25 ...
Страница 33: ...ig 2 26 2 15 Notes on disassembly Note 1 Take care not to damage the terminal when the connector is connected or dis connected Note 21 If the VCM connector does not coincide with the main board connector loosen the VCM flexible lead plate fixing screw a lit tle adjust the connectors and then re tighten the screw Fig 2 26 Note 3 Before tightening the main board fixing screws make sure that the head...
Страница 34: ...re 3 Remove the VCM fixing screws and cross recessed head oval counter sunk screw and take off the VCM unit from the main frame Fig 2 28 Notes on disassembly Insert insulating paper between upper and lower heads Base fixing screw VCMfixing screw Cross recessed head oval counter sunk screw Conical toothed look waSh Fig 2 27 Fig 2 28 2 16 ...
Страница 35: ...e part making contact between the wire and wall with tweezers move it to the right of the clamping position and set it in the clamping position as it is D Hook the lower head lead wire on the bent and raised part of the slide axis holder B and bring it to the disk guide R clamping position E Set the wire in the clamping position with tweezers so that the clearance between the wire and the clamping...
Страница 36: ...the direction of the arrow shown in Fig 2 30 SF thin M2 x 4 P 0 25 x 1 6 Push the collet lever down until the collet set is dis engaged in arrow A direction from the collet guide shaft Move the collet set gently in arrow B direc tion shown in Fig 2 31 and remove it from the col let lever 7 Remove the Estopper ring of the collet lever shaft and take off the shaft RE ETWJ 2 3 x 1 Notes on disassembl...
Страница 37: ... disk guide sleeves have been set in the disk guide L and R units 6 Set the sub frame unit in the main unit Push the sub frame unit backward toward the disk guide L unit and fix it with the sub frame unit fixing screws Screw tightening torque 6 0 kg em 7 Hook the slide lever spring between the sub frame and slide lever 8 Mount the main board set Refer to 2 4 1 Notes on disassembly Pay attention to...
Страница 38: ...care that it not caught by the lead wire of index detecto r B located under the front panel lead wire clamp Fig 2 33 1 Set the front panel and hook the lead wire of index detector 8 on the front panel lead wire clamp 2 Fix the front panel to the main unit with the front panel fixing screws Screw tightening torque 4 0 kg cm 3 Mount the main board set Refer to 2 5 1 2 20 Insert the lead wire of the ...
Страница 39: ...g it to the front Refer to 2 5 4 CS M2 5 x 4 x 2 4 Remove the disk guide L unit fixing screw and take off the disk guide L unit from the main unit 5 Remove the write protect detector fixing screw and take off the write protect detector from the disk guide L 6 Push the slide lever push buttonhook up and re move the pushbutton Disk guide sleeves Pushbutton hook PUShbutton Write protect detector Fig ...
Страница 40: ...isk guide L Fig 2 35 2 Lubricate the part making contact between the sa I fety lever add disk guide L Disk guide L Lubricate Safety Fig 2 36 3 Lubricate the eject transmission lever bearing of the disk guide L Eject transmission lever Fig 2 37 4 Push the pushbutton into the disk guide L 2 22 Lubricate ...
Страница 41: ... write protect detector board pass under the eject lock lever Fig 2 39 Fig 2 39 7 Fix the disk guide L unit to the main unit with the disk guide L unit fixing screws See A of Fig 2 39 8 Mount the front panel Refer to 2 5 4 9 Mount the sub frame unit Refer to 2 5 3 10 Mount the main board set Refer to 2 5 1 2 23 Insert the cable connecting the write protect detec tor board and iodex detector A into...
Страница 42: ... screws Fig 2 39 CS M2 5 x 6 x 2 4 Remove the slide shaft B holder fixing screw and take off the slide shaft B holder from the VCM unit Fig 2 40 5 Remove the endless belt Remove the disk drive motor from the main unit 6 Route the cable connecting the index detector B and write protect detector board pass under the eject lock lever Fig 2 39 Fig 2 40 Fig 2 41 2 24 Notes on disassembly ...
Страница 43: ...that order Fig 2 42 3 Fix the slide shaft 8 holder to the VCM unit with the slide shaft 8 holder fixing screw 4 Mount the sub frame Refer to 2 5 3 5 Mount the main board set Refer to 2 5 1 6 Check the disk speed Refer to 3 4 2 Note 1 Check the disk rotates smoothly without generating abnormal noise Note 2 Check the belt is not frayed or cracked Idler Notes on disassembly Disk drive motor Disk driv...
Страница 44: ...3 3 Remove the endless belt 4 Remove the idler fixing screw Remove the flat washer and idler bearing Fig 2 43 CP M3 x 7 x 1 5 Remove the disk guide sleeve from the disk guide R 6 Remove the disk guide R fixing screws Fig 2 44 cs M2 5 x 8 x 2 7 Remove the disk drive pulley screw Remove the disk drive pulley set I Idl I Fig 2 43 2 26 Notes on disassembly Fig 2 44 ...
Страница 45: ...5 0 kg em 3 Rotate the disk drive pulley 2 times to make sure it rotates smoothly without abnormal noise or uneveness 4 Set the disk guide R and disk guide pulley Tighten the disk guide R fixing screws Screw tightening torque 3 5 kg em 6 Mount the endless belt Refer to 2 5 6 7 Mount the sub frame unit Refer to 2 5 3 8 Mount the main board set Refer to 2 5 1 9 Check the disk speed Refer to 3 4 2 I ...
Страница 46: ...ig 3 23 CP M2 5 x 4 x 1 3 Remove the sub frame unit Refer to 2 5 3 4 Remove the front panel Refer to 2 5 4 5 Remove the disk guide L unit Refer to 2 5 5 6 Remove the write protect detector Refer to 2 5 5 7 Desolder the cable of the index detector A set from the write protect detector board Notes on disassembly Index detector A Fig 2 46 2 28 ...
Страница 47: ...e index detector A set temporarily to the sub frame with the index detector A set fixing screw 41 Route the lead wire of the index detector through the specified circuit Fig 2 47 51 Mount the main board set Refer to 2 5 1 6 Adjust the index Refer to 3 4 5 Notes on resassembly Solder the black wire of the cable to B _ Lead wire connected Fig 2 47 2 29 ...
Страница 48: ...ove the index detector B fixing screw Fig 3 25 CP M2 5 x 8 x 1 4 Remove the front panel Refer to 2 5 4 5 Remove the disk guide L unit Refer to 2 5 5 6 Remove the write protect detector Refer to 2 5 5 7 Desolder the cable of the index detector B set from the write protect detector board Index detector B Fig 2 48 2 30 Notes on disassembly IT I ...
Страница 49: ... B set to the main unit with the index detector B set fixing screws Screw tightening torque 3 5 kg cm 3 Route the lead wire of the index detector B through the specified circuit 4 Mount the disk guide L unit Refer to 2 5 5 5 Mount the front panel Refer to 2 5 4 6 Mount the sub frame unit Refer to 2 5 3 7 Mount the main board set Refer to 2 5 1 8 Adjust the index Refer to 3 4 2 9 Eject lock lever s...
Страница 50: ...ide of the eject lock lever RE ElWJ 2 3 x 1 Resassembly procedure Notes on resassembly 1 Set the eject lock lever set in the main unit Insert Check the eject lock lever spring is attached to the the eject lock lever shaft from the disk guilde L eject lock lever set unit and fix it with the E stopper ring 2 Hook the eject spring between the ejector and main unit 3 Mount the disk guide L unit Refer ...
Страница 51: ... functions of test points 3 2 3 4 2 Adjustment of disk speed 3 4 3 4 3 Adjustment of off track 3 5 3 4 4 Azimuth adjustment 3 6 3 4 5 Adjustment of index position 3 7 3 5 Maintenance of FDO SO 321 3 8 3 5 1 Periodic maintenance 3 8 3 5 2 Check items 3 8 3 5 3 Cleaning 3 8 3 5 4 Head cleaning 3 8 3 5 5 Lubrication 3 8 3 5 6 Bonding 3 9 3 5 7 Maintenance Tools and measuring instruments 3 10 ...
Страница 52: ...it to shock and avoid using it without the case cover Otherwise dust and static can adversely affect it to cause troubles Care When cleaning the OX 1 0 use a dry cloth and wipe it gently Do not use alcohol or volatile sol vent If an option or the cable for an option is connected to the ax 1 0 check the connections from time to time 3 2 Adjustment of VFO circuit 1 Check the GND terminal and TP term...
Страница 53: ...any abnormality is detected by the above checks re check according to troubleshooting for Q10 PS board unit 3 4 Adjustment of FCC SO 321 The SO 321 is made of precision parts and assembled with high precision It needs no re adjustment by the user as long as it is used normally When it is disassembled for replacement of parts and then reassembled the following adjustments are necessary 1 Disk speed...
Страница 54: ...il amplifier has two outputs one is displaced 180 in phase differential and the other is greater than about 500mVp p Each output can be observed at TP4 and TP5 These test points are used for general checking of the read write head and amplifier and adjustment of the head access mechanism Apply a false index signal to this test point when the main PCB is checked as a single body Not used for adjust...
Страница 55: ...r PCB and set the pulse interval at TP7 to 200 0 6 mS C Procedure when the strobo disk is used 1 Raise the main unit so that the storobo disk can be seen 2 Adjustment will be easy if the unit is set with the pushbutton switches down 2 Rotate the disk drive motor and set the disk 3 Rotate the disk drive motor and load the head 4 Set the head to track 20 5 Adjust VR2 on the disk drive motor PCB and ...
Страница 56: ...VERT MODE ADD INVERT ON VOLTlOIN on the screen 50mV 50mV TIME OIV 20mS Table 3 3 3 Rotate the disk drive motor 4 Set the CE disK 5 Move the head to track 34 6 Observe the waveforms on the oscilloscope Fig 3 5 TP2 TP3 7 When the ratio small large of the waveforms A to B in Fig 3 5 is lower than 0 7 tighten the inter rupter fixing screws 2 on the VCM unit 8 Move the interrupter forward and backward ...
Страница 57: ...the screen 50mV 50mV TIME DIV O 5mS Table 3 4 3 Rotate the disk drive motor 4 Set the CE disk 5 Move the head to track 34 6 Observe the waveforms on the oscilloscope Fig 3 6 Waveforms of TP2 TP3 7 When the ratio small large of the waveforms A to 0 in Fig 3 6 is lower than 0 65 and the ratio of 8 to C is lower than 0 8 loosen the eccentric pin fixing screw with the hexagonal wrench key 8 Adjust the...
Страница 58: ...INVERT ON VOLTIDIN on the screen 50mV 50mV TIME DIV 50 uS Table 3 5 3 Rotate the disk drive motor 4 Set the CE disk 5 Move the head to track 34 6 Observe the waveforms on the oscilloscope Fig 3 8 Waveforms of TP2 TP 3 7 When T of the waveform shown in Fig 3 8 is not the range 150 500 uS in SIDE 1 loosen the index detector A fixing screw 8 Adjust index detector A by inserting the screwdriver in to ...
Страница 59: ... quantity and replenish the oil if it is found insufficient after re moval of dust and nap 3 5 4 Head cleaning The head should be cleaned in the following manner 1 Set the head cleaning disk in the main unit 2 Start the disk drive motor 3 When 20 seconds have passed after starting the disk drive motor take out the head cleaning disk 4 Set the disk and read and write it to check if any smudges rema...
Страница 60: ...safety lever G 11 Part making contact between the slide lever and eject transmission lever G 12 Safety lever shaft G 13 Part making contact between the disk guide L and eject transmission lever G 14 Ejector spring and spring hook Table 3 7 Lubrication parts Classification A Lubricate every 2 years or 5 000 hours B Lubricate at overhaul or every 15 000 hours Quantity A 1 2 drops 3 2 3 drops 3 5 6 B...
Страница 61: ... key 1 5 Writing brush 1 Writing brush 2 Washing bucket Head cleaning disk Adjusting disk DYMEK No 0592 11 Precion screwdriver 3 Table 3 9 List of maintenance tools B List of maintenance parts Name of part Commercial availability Cotton bar Yes Gauze Pure alcohol Oil G S1 Plus guard SG Adhesive Neji Iock green Table 3 10 List of maintenance parts C List of measuring instruments Measuring instrumen...
Страница 62: ...rs 4 1 4 2 Repair Tools and Instruments 4 2 4 2 1 Tools and Instruments 4 2 4 2 2 Test Items 4 2 4 3 Soldering 4 3 4 3 1 Parts Removal and Installation 4 3 4 3 2 Soldering 4 3 4 3 3 Unrepairable 4 5 4 3 4 After Repairs 4 5 4 3 5 Terms 4 6 ...
Страница 63: ...se ground terminal must be grounded contact the conductive part of the ground terminal with the ci J ing of the 0 10 or your fing ers and then connect it to the GND terminal on the ci t board 2 Circuits Even if the power switch is pushed off the RAMs and some of the ICs are backed up by the bat teries When conducting a continuity test on circuits disconnect the battery connector and wait for about...
Страница 64: ...iers No O 15 Brush medium 16 Brush fine 17 Tension gauge 200g 18 Solder 19 Safety goggles 20 Gloves Table 4 1 Use Commercial available Control circuit board repair Yes Battery voltage measurement Yes Continuity test element check Yes Coantrol circuit board repair Yes Removing unsoldering elements Yes from circuit board Removing unsoldering Yes elements from circuit board Yes Yes FDD SO 321 repair ...
Страница 65: ... direction and lead length so that the leads will not contact other lands on the back of the circuit board Reason To prevent short circuit on the back 5 When install a register on a circuit board make sure that the parts are not in direct contact with the circuit board surface Reason To protect the circuit board from damage due to the heating of the parts 6 When using a wire for repair make it as ...
Страница 66: ...x X X r rr Lead end must be out of Leads must not normally be Leads must not be too long through hole bent Must be more than 3 4 filled Fig 4 3 2 Parts Installation Correct Parts must be installed parallel to the circuit board surface Allowable limit 30 Fig 4 4 4 4 Parts must be clear of the circuit board Parts must not be too far away from the circuit board surface to prevent shortcircuit with ot...
Страница 67: ... if repairs are attemted Through hole with peeled copper lining Peeled land Peeled printed pattern Burnt circuit board Cracked circuit board Replace the circuit board itself if it has any of the above defects 4 3 4 After Repairs Take the following steps after repairing soldering Completely wipe off the flux from soldered points with a brush or the like If patterns are touched by hand wipe them cle...
Страница 68: ...Printed pattern Parts leads go into the through holes shown at left Fig 4 6 Front of Cicuit Board Pr inted pattern Land 1 r c Jt ThrOUgh hOle Circuit board Printed pattern Copper or solder coated copper Fig 4 7 Cross Section of Circuit Board 4 6 ...
Страница 69: ...Procedure 5 2 5 3 Unit Troubleshooting 5 1 0 5 3 1 Q1 OPS board entry table 5 10 5 3 2 Q1OSYM board entry table 5 21 5 3 3 Q1 OGMS board entry table 5 62 5 3 4 CRT drive unit entry table 5 81 5 3 5 Keyboard unit entry table 5 90 5 3 6 FDD unit level troubleshooting guideline table 5 95 ...
Страница 70: ...he check out procedure and perform troubleshooting by replacing the corre sponding units In this case be sure to check again that the replaced unit is not defective This is done to distingwish the fault from those caused by contact failure of connectors o As the second step replace the defective element in the corresponding unit according to the unit flowchart or table of faults Notes 1 When a che...
Страница 71: ...5 2 Check out Procedure START Turn on the power switch y Insert the diskette containng the system Adjust the sub bright ness control of CRT y 5 2 Connect the cable securely Replace the block ...
Страница 72: ...Measure the supply voltage at vltage check terminal eN11 on Q10SYM board Y Y N N Replace the Q1 OPS board Replace the LED 5 3 Y Replace fuse F1 Y ...
Страница 73: ...ed If the short circuit is corrected as a result replace the option and fuse F1 arid then chec again according to the check out procedure Replace Q 1OSYM board N Replace the FDD unit Replace Ql OSYM board Check again according to the check out procedure 5 4 Execute the diagnqstic program Y Replace Ql OSYM board N ...
Страница 74: ...ls t read the floppy disk contents Perform the read write check of the floppy disk Defective floppy disk Do the check out procedure again with a normal floppy disk N 5 5 FDD reads no contents No sound is heard ...
Страница 75: ...es A and B of the FDD signal cable CN7 Insert the floppy disk and check if it is read with drive B The floppy disk is not read with drive A but read with drive B Defective drive AI Replace the drive A unit Check again according to the check out procedure 5 6 y N Replace the in use lamp ...
Страница 76: ...Floppy disk contents are not read with FDD A and 8 Replace Q 1OSYM board Y Check again according to the check out procedure N Replace FDD A and FDD B Y 5 7 N Replace the cqnnection cable ...
Страница 77: ...Read the diagnostic program Execute all the items of the diagnostic program Check again according to the check out procedure 5 8 ...
Страница 78: ... unit Replace the FDD unit Replace 01 OGMS board Replace 01 OSYM board Replace 01 OSYM board Replace the external option Replace the RAM leading into a defective bit Replace 01 OSYM board Replace 01 OSYM board Replace 01 OSYM board Check again according to the check out procedure 5 9 ...
Страница 79: ...4 0360 Telex 9103496217 EPSON DEUTSCHLAND GmbH Am Seestern 24 4000 Dusseldorf 11 F R Germany Phone 0211 5961001 Telex 8584786 EPSON U K LTD Dorland House 1F 388 High Road Wembley London Phone 01 900 0466 9 Telex 8814169 EPSON ELECTRONICS SINGAPORE PTE LTO Suite 813 8th Floor World Trade Centre No1 Maritime Square Telok 61angah Road Singapore 0409 Phone 2786071 2 Telex RS39536 ...
Страница 80: ...EPSON EPSON CORPORATION Printed in Japan 83 5 1 ...
