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Amstrad CPC6128 service manual

1. e PRICE CONTENTS Page Safety Test 2 Keyboard Exploded View and Parts List 3 CPC6128 Basic Hardware Analysis 4 Function Diagrams 5 Function Diagrams 6 Software Errors 7 Diagnostic Flow Chart 8 9 10 11 Alignment Checks 12 13 14 15 CPC6128 Main PCB 16 17 18 CPC6128 CPU Circuit Diagram 19 20 Electrical Parts List 21 GT65 Exploded View and Cabinet Parts List 22 GT65 Circuit Diagram and Voltages 23 GT65 Main PCB and Alignment Instructions 24 GT65 Electrical Parts List 25 CTM644 Cabinet Drawing and Electrical Parts List 26 CTM644 Electrical Parts List and Alignment Instructions 27 CTM644 Electrical Parts List and Voltages 28 CTM644 Circuit Diagram 29 30 Main PCB 31 32 Interface Circuit Diagram 33 34 Disc Control Circuit Diagram 35 36 Cassette Control Circuit Diagram 36 Mechanism and Mechanical Replacements 37 Technical Specification Back page SAFETY TEST All Monitors are safety tested to the following specifications 1 Flash Test Test at 3kV between the live and neutral of the mains lead joined together and and ALL accessible metal points on the exterior of the set 2 Insulation Resistance Test Test between the live and neutral of the mains lead joined together and ALL accessible metal points on the exterior of the set to show a resistance of at least 4Mohm If after servicing there isany doubtabout continued electrical safety the above tests should be carried out AMSTRAD CONSUMER ELECTRONICS P
2. 27 Circuit Reference CTM644 ELECTRICAL PARTS LIST Polypropylene Capacitors 0 012uF 1600V C431 O 1uF 250V C501 0 82uF 200V 10499 Polystyrene Capacitors 0 001uF C442 0 0015uF C408 0 0047uF C421 0 0056uF C415 O 01uF C413 427 O 015uF C409 O 039uF C404 0 047uF C406 Circuit Ref Description Part No 0 068uF C410 422 428 Tantalum Capacitors 1uF 16V C411 2 2uF 16V C426 I C s IC401 LA7800 IC402 LA7830 UPC1378 IC501 STK7308 IC502 L78MG IC503 UPC78M12 Circuit Ref Description 170455 1400124 1422115 170456 1422116 170848 170458 170459 1400122 170460 1422114 1400145 1400130 170842 1400148 170463 170464 170845 900101 170306 Transistors Q401 402 KTC1815Y 504 506 Q403 KTA950Y Q404 28C2271 Q405 2501397 Q501 28D1207 Q502 2SD880Y Q503 505 KTA1015Y Q801 803 2SC3417 Diodes 170434 D401 Sil IS2472T 1400202 D402 403 Zen RB11EB 170435 0404 506 508 Rect DFC10E D405 407 408 Sil TVR O6K D406 Rect BB 4 eee D505 5 e S6rB 170436 0509 30J 170437 0510 Zen SR2M 100735 0511 512 Rect RU4A D901 903 Zen GZA6 2Y 170440 Coils amp Transformers 170442 L401 Linearity Coil 1431MS 170443 L501 Line
3. NO IMPROVEMENT STILL NOTHING FAULTY VIDEO CONNECTOR FAULTY CABLE ASSY FAULTY ULA FAULTY PCB p CHECK FAULTY MONITOR TERMINATION INTERNAL CONNECTORS 3 BRIGHTNESS CONTROL FAULTY ULA SEE DISC FAULTY AUDIO AMP OR SPEAKER 280A FLOW CHAR FAULTY VOLUME CONTROL 6845 FAULTY AUDIO CONNECTOR PLUG SOCKET FAULTY AY 3 8192 SOUND IC Full diagnostic tests on the C P U can be carried out using the Amstrad RP2 Test Pack Please contact Amstrad PLC for information on same FUNCTION DIAGRAMS ICH4 Vcc OUTPUTIQ ID 2D 29 30 3D 4D 40 GND CONROL 1 104 105 STROBE A 610910 vee 2G SeLEcT DATA INPUTS OUTP m D ee Ales JC3 162 1 Cee ACNENGO Erreur H 4 ST STROBE 76 SELECT DATA INPUTS WY UlGND INPUTS OUTPUTS Vcc B C D 8 1 101 BCD TO DECIMAL 01234567839 GND OUTPUTS C106 vcc 8Q 8D T 5 2D 28 3D 4D 48 GND ICHS 26 IY 2 4 2 243 242 2 1G 141 2 4 142 2 143 2Y2 i44 2Y GND CHO 4B 4 4Y 3A 1 IB IY 24 2B 2Y GND ICH2 48 4A 4Y 3B IB 5 IY 24 28 2Y GND FUNCTION A MICROCOMPUTER AND IC s ICI08 16102 ANALOG CHANNEL C TEST Vcc ANALOG CHANNEL B NALOG CHANNAL A Vss 1047 1046 1045 1044 1043 1042 104 1040 CPC6128 FUNCT
4. Circuit Reference Part No Carbon Film Resistors ail 1 4W unless otherwise shown Metal Oxide Resistors 100o0hm R810 901 903 10032 1200hm 1W R449 170405 2200hm R407 416 10040 1kohm 1W R503 170406 2700hm R807 811 814 10042 3k9ohm 1W R505 170407 330ohm R401 404 422 10044 15kohm 1W R805 812 170408 3900hm R414 10046 0 220hm 2W R513 170409 4700hm R505 510 10048 150hm 2W R512 170410 1kohm R411 423 432 519 815 10061 S3ohm 2W R509 170411 816 82o0hm 2W R520 170412 1k5ohm R420 421 441 10065 1000hm 2W R433 170413 1k80hm R402 403 442 10067 3k30hm 2W R427 170414 2k2o0hm R410 10069 6k8ohm 2W R405 170415 2k7ohm R904 906 10068 1ohm 3W R502 170416 4k7ohm R426 518 10077 6k8ohm R415 10081 Electrolytic Capacitors 8k2ohm R406 418 419 10083 1uF 50V C414 20062 1uF 160V C419 1422151 1uF 250V C506 1422152 4 7uF 50V C407 420 1400240 10uF 16V C520 20024 22uF 10V C437 170418 22uF 250V C430 170419 47uF 10V C436 170420 1Okohm R424 428 429 10085 12kohm R409 10087 15kohm R431 450 10089 27kohm R425 10095 47kohm R412 440 10101 56kohm R417 10103 82kohm R430 439 10107 47uF 16V C405 418 1400244 180kohm R408 10115 47uF 50V C512 170421 220kohm R413 10117 47uF 160V C401 170422 270kohm R504 10119 100uF 16V C412 443 523 20028 680kohm R451 10129 100uF 35V C425 1422157 Q1ohm2 2W R443 170401 100uF 160V C515 1400246 100uF 400V C505 170423 220uF 35V C507 20055 220uF 160V C515 170851 470uF 10V C518 170424 470 25
5. i Ves 8 5 1 2 jap Ko V V V RDW 5 ENE Software Errors If a drive fault is reported the fault may be a software problem Before investigating the drive please carry out the following checks to ensure it is not a software problem Detection and Correction of Soft Errors Soft errors are usually caused by the following reasons 1 Random external noise of several usec or less 2 Minute off tracking and shifting of write timing that are not detected during the write operation which can cause the soft error during the read To remedy such soft errors take the following procedures at the controller side 1 Repetitive reading on the track by 10 times or more until the data is restored 2 When the data is not restored by step 1 access the head to the adjacent track in the same direction as move previously and thereafter return the head to the original track 3 Repeat the step 1 4 If the data is not restored by the above steps the error cannot be remedied Write Error When an error is caused during the write operation the error is usually detected during the next rotation through the read operation called Write check To correct the error repeat the write operation again and carry out the Write check If the result is still incorrect even after the write operation is repeated more than 10 times either the disc or the drive are working incorrectly To find out
6. 5 TO CRT PCB lue From Power SW Green CD002 83320144 _ C D008 8301014A tack From Degauss Coil BlacK L502 80140013 31 82 INTERFACE CIRCUIT DIAGRAM cb201 068 60004 19 gt qp 510 lt gt I FLTR STEP 225 RWASEEK fal E sce IL BL s fe 324 1 2S lt B gt E 5 3 171 L i31 a 32 gt 33 lt 41 gt 4 7 os P Hb LD i i i 2 3 9e PL 9 EXPANSION CONNECTOR 8 S696 269 SAWAY 051 EDGE CONN x 3 5 9 AA FEA BATA L n Et iw CR el m 8 5432 EXP 2505 m 5 lt T ES 1 m LE LA E CT 045 T E cD202 0686140804 F T icone 888988889808 epITITUDCTITITITIT T T 1 210 4 8 Sl di dl dj di di di 74 5132 JHEBEBEEBBEDBEBE r3 el a uS 1c213 8S STS al als 7AHCTBIP COMDITION MAIN SWITCH is SWIGED RENY RORIS NOTES THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME Wo PE I DRIVE THIS SCHEMATIC DIAGRAM 18 THE LATEST AT THE TIME CHASSIS SCHEMATIC DIAGRAM 208 01 13584 Note See Page 21 for Electrical Parts List 34 DISC CONTROL CIRCUIT DIAGRAM WARNING This Circuit Diagram is for information only During th
7. C435 519 20044 470uF 35V C402 522 1422262 2200uF 25V C424 170425 Ceramic Capacitors 22pF 500V C416 1400217 100pF 500V C423 441 1400218 130pF 0806 170426 180pF 500V C403 170427 240pF C804 170428 270pF 2kV C432 170429 330pF C803 807 1422255 560pF 500V C417 1400220 680pF C802 1400213 2200pF 4kV C513 170430 0 001 uF 500V C516 521 170431 0 001uF 2kV C511 801 1422147 0 0015uF 2kV C510 514 170432 0 0022uF 2kV C502 504 1400223 0 0047uF C508 509 170433 4700hm 24W R445 1422125 680o0hm 2W R447 809223 1kohm T2W R514 517 1400165 1k5ohm 2W R448 1422126 2k2o0hm 2W R446 170402 2k7ohm AW R802 804 1400166 180kohm W R506 507 170403 1Mohm R801 1400171 Fuse Type Resistors 1ohm AW R521 809252 8 20hm 4AW R444 170404 10ohm AW R511 809256 0 820hm 1W R438 437 1422141 2 20hm 1W R435 1400184 Cement Resistors 5 60hm 5W R501 150hm 7W R436 1422138 170417 CTM644 ALIGNMENT INSTRUCTIONS FUNCTION SIGNAL IN SIGNAL OUT METHOD REMARKS Black and White Monitor Screen 1 Turn R amp B Drive Controls VR804 VR805 fully Monitor connected to CPC664 Tracking counterclockwise 2 Turn G amp B Bias Controls VR801 802 803 fully counterclockwise 3 Set Ser Nor Switch to Ser position 1 Adjust 120V at the collector of Q802 with Brightness Control on the Oscilloscope 2 Rotate the screen control to fully counterclockwise amp bring it back to obta
8. DOS lt lt 0 0502 gos 12 0V DC 12 6V DC 20 6V DC Os 55 DS 8BenoooxzO m 605 D 9 g 20VDC 22VDC 39 5V DC an ms gt GT65 MAIN PCB POWER E 109091 5 BOARD mm as 2 oS Ta N oc BE CP503 ge E 171825 2 gt 5 esd fee SS s p _ yp 2053 5 94 os bn guise eee aea ee ya LO 2 042 gS t asos KTC18 5 GR Pi TO J501 J 470 01 630 s L 3 58 or e ox AES BS Qa TO PCB702 quo 2 Es ga e o 5 do 8 AE 6 B Th 1G Bu ma es aS xe es i 9 ELS U1103 142 TERE ox 8 55 20L82d SS GT65 ALIGNMENT INSTRUCTIONS STEP FUNCTION SIGNAL IN SIGNAL OUT METHOD REMARKS 5V Adjustment Monitor Switched on across C519 Adjust VR501 to obtain 5V SS 12V Adjustment Monitor switched on Emitter of Q502 amp Earth Adjust VR502 to obtain 12V ale i 3 H Hold Monitor switched on Monitor Screen Connect Frequency Counter to CRT Heater Adjust L703 to obtain 15625Hz on Frequency Counter 4 k V Size amp Linearity Page Program for Monitor Screen Top of
9. Filter FKOB 160MH14 L502 Degauss Coil 1400225 L801 Coil 100uH 1400228 T401 H Drive 305Y001 T402 Pin Cushion 1432MS itchi 814 1400106 T501 Switching Tx 2006 170444 Switches 170445 SW401 Slide Switch 170446 SW501 Power On Off Switch 3222 5 Variable Resistors VR401 Rot 500ohm VR402 S F 5k VR403 S F 5k 10447 VR404 S F 2k VR405 Rot 20k 120249 VR406 407 S F 1k 1270450 VR801 S F 5k R 170451 VR802 S F 5k G 170452 VR803 S F 5k B 170455 VR804 S F 500ohm R 3170454 VR805 S F 500ohm B Miscellaneous FB401 FB LOPT 3714004 F501 Fuse 2A T TH501 Degauss Element ERP F5BOM180H voo1 C R T 3701B22 TC20 J501 D C Jack J801 C R T Socket CTM644 VOLTAGES IC401 LA7800 IC402 LA7830 1 6 35V DC UPC1378 2 6 48V DC 1 OVDC 3 0 32V DC 2 12 74V DC 4 0V DC 3 24 4V DC 5 0V DC 4 0 84V DC 6 0 85V DC 5 0VDC 7 3 21V DC 6 24 2V DC 8 0 33V DC 7 2 5V DC 9 0 93V DC 10 5 55V DC 11 0 96V DC C502 LM78M6 12 11 04V DC 1 18V DC 13 0 89V DC 2 0V DC 14 11 18V DC 3 54V DC 15 12 43V DC 4 5 0V DC 16 4 11V DC 28 HPS0092 01 030 Q405 2SD1397 DC B 0 1V DC C 98 8V DC Q404 28C2271 E 0V DC B 0 3V DC C 34 1V DC 170315 1400227 1400227 1400230 1400035 170466 1400197 1400198 1400199 1400200 1400201 170467 1400253 1400195 170307 170844 170843 CTM644 CIRCUIT DIAGRAM 500 98 m Y HOLD yo R41
10. in conjunction with the diagnostic flow chart Equipment required Double Beam Scope EME CF2 Test Disk please refer to disk notes for usage The following checks can be carried out in routine servicing If the wave patterns do not appear this confirms a fault with the mechanism Before attempting any replacement check these waveforms thoroughly Content of adjustment and checking o 1 Redial adjustment by use of Track 19 Fig 1 2 Adjustment of the index burst by use of Track 39 Fig 2 3 Azimuth check by use of Track 39 Fig 3 4 List of Test Points Test point Name of signal Read signal of filter outlet Read signal of filter outlet Signal ground TROO sensor output Index signal Signal ground BLOCK 2 BLOCK 3 BLOCK 49 roo 500ps 200ms TOTAL 49 BLOCKS INDEX INDEX Fig 1 Waveform of T19 Servo pattern ALIGNMENT CHECKS 500 Fig 5 1 Index burst waveform 100 80 60 Amplitude ratio 96 40 Inner b a x 10096 Outer a b x 10096 20 10 20 30 40 50 Amount of Off center p Fig 5 2 Off centre calibration curve Effective width of read head is 180u 48 72 48 472 PE HH Fig 5 3 Azimuth burst H Fig 5 4 shows azimuth burst in the cases of azimuth 12 0 and 12 13 ALIGNMENT CHECKS cont ROTATION MEDIA Difference between Track 00 and 39 is within 18ps 27 Fig 2 Waveform of T39 Index pattern Radial alig
11. s ability to present text 80 column format is a prerequisite for the majority of CP M applications Disc System Specification The disc drive is a 3 inch system conforming to the Hitachi Panasonic standard The software is configured for a 12mS step rate and 30mS settling time The system is designed to control a maximum of 2 drives AROM contains the extensions for AMSDOS and the machine dependent elements of CP M and Dr LOGO The ruggedly constructed 3 inch discs are usable on both sides each side is provided with a reusable write protect clip which is slid into position as required AMSDOS amp CP M Plus AMSDOS is a disc operating system which expands Locomotive BASIC adding additional commands to make full use of the disc files AMSDOS enables BASIC programs to access disc files in the same manner as cassette files in fact the same commands are used with file names conforming to CP M and CP M Plus conventions AMSDOS and CP M both share the same file structure and can read and write each other s files The Digital Research CP M Plus operating system is supplied with the CPC6128 permitting the user to access the wealth of applications software written to run under CP M In addition to the usual CP M Plus utilities additional features have been included for the CPC6128 Disc Organisation Both AMSDOS and CP M Plus support two different disc formats System format and DATA only format Format selection is automatic on di
12. the trouble source carry out the read operations with another track Should the error still be found change the disk and repeat the above procedures Should error still be found the drive should be considered defective If the error is removed the original disk must be defective Discard it Seek Error 1 Step motor or step motor drive circuit is defective 2 The torque of the carriage is not correct Restoration procedures from the seek error Make the re calibration to the track OO Then carry out the re seek to the original track Notes 1 Always ensure the head is clean 2 Index Sector Factor Ready Defect As the unit has Optional Read Output It is normally not ready until 2 revolutions are made after the disk insertion Diagnostic Flow Chart This chart must be used in conjunction with the Alignment Procedures This chart is for information only and does not guarantee an exact diagnosis For warranty purposes any faulty drive mechanism must be returned to Amstrad for replacement Service Agents should notattempt any repairs on the mechanism or to its P C B P No 30001 Index period 200 5msec Motor rotation Self read error Read error Write error Write error Interchange ability error Interchangeable lead Disk Drive O K ee FLOW CHART cont Motor rotation Does motor rotate N Power supplied Y Adjustable
13. with VR201 Check wiring Y Adjust to 20034 1ms Does it rotate N normally by using normal motor Y Replace motor Replace drive 10 FLOW CHART cont Read error Test with disk EME CF2 TR39 N 2F output 2 140mV Is head touch O K If TROO output lt 220mV Replace drive Is head output 1mV or more Read write error in all tracks Replace Replace drive head assembly Read error only in specific track N Seek error Replace disk inspect by drive Y Replace drive N TROO output normal Y R Replace drive TROU FLOW CHART CONT Write error Error continuous Check action in seek failure flow Write waveform in TP1 2 Check action in read failure flow Open Head system Head connector open or short Amplifier Short system Replace Replace drive Repair control PCB head connector Interchangeable lead error Off track media lead test Off track media lead test Adjust positioning N Index timing 1000usec Adjust 11 12 The data contained in the following 4 pages is for information only Service Agents must carry out any repair or adjustment to the Drive mechanism and its associated PCB 30001 during warranty Fauity mechanism must be returned to AMSTRAD for exchange Alignment Checks Please use this this information
14. 154 GSV 4 7K RD WR TORQ G2X33Xx31 HS CMOS 9USE LAL 23 4 SOUND 15 GOD 14 A12 SQUND CONNECTOR STEREO JAI CPC6128 CPU CIRCUIT DIAGRAM SOUND CLOCK lt 1MHZ gt CPU gt S 2 gt S SPARE gt 7 FIRE 1 2 o4 RIGHT gt 3 LEFT V V V V V V V gt 2 DOWN 1 UP gt 8 COMMON 67 8 9 CP101 CP102 3102 PADDLE PORT S PIN D CONNECTOR eR d r ASADOR C205 3 41508 84 A 10 07 AND AISDUT 06 A14O0UT 3 A or PRESENT A13 FOR 64K a 12 Al4QUT TOW CASO CASI T ATQ J106 A4 1 CPU A3 ag A2 Al CALL OUT FAR 128K IN FOR 14 Y8 KEYBOARD 15 Y CONNECTOR 17 YS 18 18 Y3 20 Y2 Y1 Ox 5V H MOTOR 5 SOUND RD DATA 16 8 D WR DATA PORTD 2 GND 2 5V 06 10K R117 co 14 GNO 1C123 64K X Di IC122 1C121 IC120 CAS1 2ND BANK ONLY gt R118 6101 C134 0 1X 34 BC M RE 10110 74 5132 1 h ROM DIS SENE un 1905 1104 PRINTER 8 PORT 7 02 36 WAY 501 0 1 EDGE IC1248 48640 2 1 RAM ALL PINS EXCEPT DATA FULLY PARALLEL NOTE SEPARATE CAS TO EACH BANK FOR B ICS OTHERWISE SECOND S COMPLETELY PARALLEL 07 WITH FIRS
15. 170508 170509 170510 170511 170513 170514 170515 170516 170833 170518 170519 170316 170317 170834 L701 71011202 i 8 B B k iq og nt 5 8 d ota D 17 3 17 8 7 E j 1 5K pe 8 98 x 772 Ny e 25 qc je E R714 g i z se 1 Ir _ 2 16060401 Ma I c 0501 504 gut IHE o GREEN MONITOR DISPLAYTUBE dl ms gt z 9 gt x go r G Aosiitss m RB 208S2 T T VS H i gt 729 1 18v220 i A S i oj t LET ME CS0S 508 85 88 2012003 0 047 X4 BQ KA i 9 m O CHASSIS SCHEMATIC DIAGRAM NOTE THIS SCHEMATIC DIAGRAM 15 THE LATEST AT THE TIME o OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE E B C m TA CAUTION SINCE THESE PARTS MARKED BY ARE ATTENTION LES PIECES REPAREES PAR UN ETANT gt N A C N lt CRITICAL FOR SAFETY USE ONES DANGEREUSES AN POINT DE VUE SECURITE Q501 poe obo t DESCRIBED OW PARTS LIST ONLY CELES ical 5 1V DC 5 5V DC 13 6V DC SON a eM
16. 2116 D707 Rect 10D 2 1400123 Coils amp Transformers L701 D Y 71011202 170510 L702 Linearity CL 21000006 170631 L703 Horizontal C L 305Y001 170632 L704 C L 100uH 1400148 T501 Power Tx 0766001E S 170832 T701 H Drive Tx RB20852 170633 T704 F B Lopt 2012003 170835 Variable Resistors VR501 S F 500o0hm 1422189 VR502 703 S F 2k 1400230 VR601 ROT 1k 170518 VR602 ROT 10k 170519 VR604 605 S F 50k 920142 VR701 ROT 30k 170833 VR702 S F 10k 1422191 Miscellaneous CD501 D C 16060401 170316 CD601 D I N Cord 8GE 70001 170317 F502 4A T Fuse 1400254 F503 2A T Fuse 1400253 TH701 Thermistor SDT 250S 170635 V701 C R T 310GNB31 170507 25 26 N OO CTM644 CABINET DRAWING CTM644 CABINET PARTS LIST Front Cabinet 170841 Control Knob Brightness 170304 Button On Off 170305 Power On Off Switch 170306 Brightness Control 170315 Degauss Coil 170842 C R T 170307 Deflection Yoke 170308 C R T Socket 170843 Metal Washer Bottom 140001 1 Rubber Washer 1400012 Metal Washer Top 1400011 Fixing Screw 1400013 Static Rings 170311 Handle 170312 Rear Cabinet 170313 Handle Retainer 170314 F B T x 170467 V Hold Control 1400035 D C Cord 170316 A DIN Cord 170317 A D C Jack 170844 Service Normal Switch 900101 CTM644 ELECTRICAL PARTS LIST
17. 3k3ohm R131 10073 IC117 4k7ohm R144 310 323 10077 iC118 10kohm R114 117 120 133 142 217 10085 IC119 134 309 312 1C201 18kohm R308 311 10091 202 22kohm R118 119 304 305 10093 IC203 47 kohm R302 303 307 319 320 10101 IC204 470kohm R314 IC205 1Mohm R111 10147 1C206 208 3M3ohm R101 170867 IC209 10Mohm R143 145 170868 C211 4ohm7 VW Fuse R322 170866 IC212 100o0hm 2W R316 1400183 IC213 Ceramic Capacitors ed 15pF C137 138 170869 a 220pF C139 141 310 400107 Transistors 270pF C313 170126 Q101 470pF C306 24004 Q102 301 302 O 1uF C101 135 201 213 24020 W303 Electrolytic Capacitors Miscellaneous 1uF 50V C309 311 314 317 318 20062 J101 22uF 10V C308 20025 J102 47uF 10V C136 303 306 1400244 J103 100uF 10V C301 304 20028 J104 105 100uF 16V C315 20028 J106 Polycarbonate Capacitors All working voltage 50V D C O 01uF C305 170128 CD302 O 047uF C318 1409178 CD201 0 068uF C302 170129 FDD201 O 1uF C319 320 170851 Diodes NR101 D101 303 304 1S2472 HS 170115 NR201 D201 DS442XFA5 170816 RY301 D301 10E1 170865 i D302 SLP 155B R 170866 HD74LS145 AY 3 8912 TMM 23256P 1953 HD74LS153 HD74LS273 M5L8255AP 5 HD6845SP HD74LS132 Z8400APS HD74LS32 HD74LS373 HD74LS244 HSG3130 3170 TC74HCUO4P PAL 16L8AC MSM3764 20RS UPD765AC 2 FDC9216BT SN74HC240N TMM 23128P 1851 DN74LSO8 DN74LS38 DN74LS136 DN74LS27 DN74LS74 TC74HC161P LA4140 LA6358S 2SC2120Y 2SC1815Y 2SC950Y Ja
18. 41 RESET 41 82 165112 74HCUO4 NOTE THIS SCHEMATIC OIAGRAM IS THE LATEST AT THE TIME OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE TE 20 429 a5 422 ROMEN 425 CSV Vibe OUTPUT VIDEO 3 8 3 CONNECTOR 8 PIN DIN gt EJESESI 12 R126 1 245 RED 28 270 R130 3 270 ae N Hs GATE olo 05 ARRAY con 40 rj m GSV 39 AMSTRAD 25 40010 9102 37 TYPE i29C3815Y 35 n HS63130 39 OR rti LUM 24 HSG3170 5 a NSYNC SYNC ee 29 a gt R137 4 28 LU W SYNC 220 5 30 GND s 0 22 GSV 18 15 a gt z m 20 21 1 NOTE 40007 X AND 1 40010 ARE ALTERNATIVES INSTALL 4105 SOCKET ONE OR THE OTHER BUT NOT BOTH 27 NROMEN CHASSIS SCHEMATIC DIAGRAM M208 01 1 3583 Circ Ref Description ELECTRICAL PARTS LIST Carbon Film Resistors IC s 47ohm R146 153 161 162 10020 IC101 56ohm R155 306 10022 IC102 82ohm R141 10030 IC103 150ohm R136 10036 IC104 105 109 180ohm R134 10037 119 220ohm R137 10040 IC106 270ohm R126 128 130 10042 IC107 560ohm R317 10050 IC108 680ohm R125 127 129 135 157 158 10052 IC110 210 301 1 111 1kohm R113 121 123 132 140 211 10061 iC112 207 212 216 313 315 321 IC114 Q1k5ohm R124 10065 IC115 2k2ohm R102 109 110 112 214 10069 IC116
19. 710 C720 C517 C709 C727 728 732 C515 C711 C510 C509 514 170601 1422126 170602 170603 170604 170605 170606 809256 1422144 400107 1400125 170600 24015 1422151 809246 1400240 20024 20037 170608 20025 170609 170610 1400244 800370 170611 20029 170836 800372 170612 170613 0 0047uF 0 0068uF 0 0082uF O O1uF 0 022uF 0 033uF 0 047uF 0 082uF Polystyrene Capacitors All 50V D C W C715 C714 C723 C718 C721 C725 C701 702 708 716 C722 170437 170614 170615 170439 170616 170617 170422 170618 GT65 ELECTRICAL PARTS LIST Polypropylene Capacitors 0 0033uF 630V C733 0 068uF 400V C729 Tantalum Capacitors 1uF 25V Circuit Ref 170619 170620 170621 Part No Description L78MG OEC 170446 IC502 L78MG 170446 UPC1031H2 170622 UPC78M12 1422278 Transistors Q501 502 2SD313 50005 Q503 505 KTA1015Y 170453 603 604 Q504 506 KTC1815 170447 601 602 701 Q605 KTC2229Y 170624 Q702 KTA950Y 170448 Q703 2901159 170623 Diodes D501 508 Rect 30D IFG 170625 D509 Rect 10D 1 1400125 D601 Zen RD47FB 170626 D602 701 Sili DS442X BT 1422117 D603 Zen RD56FB 170627 D702 703 Ger IN34A 170628 D704 Rect VO9C 170629 D705 Rect VO6C 170630 D706 Rect B B 4 142
20. ION DIAGRAMS IC UL PA3 A xu Vo paz 2 Pas yo ADRESS ige PORT A 3 pas PORTA woe Sie PAO 4 37 P47 Ai 4 SUN READ WRITE E WR CONTROL 7 5 ag APRESS cs E J RESET _ INPUTS 16 5 7 Z QE Hs PORT id TB Di pata Dont PM Puis lao E 22 Ds7 8 42 ro 03 DATA EK E Da Ass bs Ai 6 7 H D4 T S PCs 2 Ds D2 2 GND Yo 4 D6 ATA RF s PORTC PCo 4 27 7 pte SHT PU E 15 CPU 2 B ES RESET pot Pez ie idi 7 5 CPU Poa CONTROL NM 809 ool aa UE MTS BUSAK Yo PORT PORTB UBI Boe system REQ WR sysrEM LPB2 0 PBs CONTROL 0 CONTROL KEYBOARD SW CONNCTOR NO 2 3 4 5 6 7 8 9 10 Q 7 DEL RESET Cf1 T SET 2 ESC RD RW SEEK V 7 y o WR LCT DIR cs i E w D C X FR STP 7 L x aR DBo RDY n DB1 wP TS 7 re 4 SPACE SER Ai L KEY 3 o W V5 7 HA DB4 in DBs ae V 21 DE us l 7x 2 gt 6 1 DB 05 1 2 pas zr Z 7 amar 7 HD CLR 4 DACK R TC WE 7 7 O18
21. LC BRENTWOOD HOUSE 169 KINGS ROAD BRENTWOOD ESSEX CM14 4EF Telephone Brentwood 0277 228888 Telex 995417 AMSELE G dn y ON OORUN KEYBOARD EXPLODED VIEW KEYBOARD PARTS LIST 170855 170856 170806 170857 170858 190005 Cabinet Top Assembly Frame FDD Knob Volume Cabinet Bottom Keyboard Assembly ESU 244 Compact Floppy Disc Drive EME 155 Volume Rotary K121LOZOT 20KB Jack RCA 3 5 HSJ1061 01 440 User Port Socket HXC0730 01 010 Jack DIN TCS4450 01 101 Jack DC HEC0470 01 630 Jack DIN TCS4460 01 1011 Cord DC 14550401 Relay G4S 1112P 1 B 19 Cord Connector 8W6Q004A Speaker CO40K01K2451 170807 170022 170023 170850 170024 170025 170822 170123 170862 170124 REPLACE OK CONNECT TO CPC6128 BASIC HARDWARE ANALYSIS RED LED LIGHTS REPLACE MAINS FUSE CHECK FOR FAULTY CABLE OR PLUG ASSY FROM MONITOR CHECK INTERNAL CON FAULTY LED SEDI i BROKEN PCB TRACK JOINTS FAULTY CONNECTER CHECK KEYBOARD PCB FOR SIGNS OF ABUSE CRACKS LIQUID SPILLAGE DISTORTED MOUNTING CHECK CONNECTOR LEAD AND TERMINATION TEST SWITCH REMEMBER TO TURN BRIGHTNESS UP FAULTY SWITCH ANY PICTURE AT ALL YES IF UNIT STILL FAULTLY SEEK SPECIALIST ADVICE TRY KEYBOARD ANOTHER DISC CONNECTOR
22. T 06 07 06 05 D3 D2 DO ROMEN 42 R143 3 84K O RISO 47 OF 10130 15128 05 D4 D3 02 IC1328 OFF HM4864U 2 G4K X 1817 RAM 16181 ALL PINS EXCEPT DATA FULLY PARALLEL HSYNC DISPEN 25 24 16111 58 07 280 2 06 DATA BUS S D5 z3 D4 1c108 031 3 HDEB4SSP 2 02 Di 22 Di Ual 0 00 CONTROLLER 2 RESET E L PEN zio EXPANSION BUS 19 10K CURSOR 16110 24 5132 OR 74HC132 10 Ni p ii pa 16112 74 532 OR 74HC32 lt 16 2 CLOCK 06 8 8 15K RAMRD RAM DIS 8 D4 DY DO BUS 482 READY 39 3 DO CONN 17 D 6 7 11 T 19 BUSY 18 GND lt 2 4 6 8 10 12 14 16 20 27 30 2 EXPANSION CONNECTOR C137 SOWAY 0 1 EDGE CONN 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 AS A3 A1 07 05 D3 D1 AG AB AG DS D D Da be IC112 16117 74HCUO4 74HCUGA 13 12 40 4 42 43 44 4G 48 47 GSV Wi WR INT BUSRG READY RESET ROMOIS RAMDIS L PEN MREQ RFSH RO BUS ROMEN RAMRD CURSOR EXP RESET 20 Tox RISS 3 1 Se 50 4MHZ CLOCK S6 4 12 052 16 R124 A15 2 T A14 s 391
23. VR4US 20KB Ed 15K 390 8 8 acd 0 038 C407 5014 7 R408 6407 180K 15790 495 0 C410 0 0 R405 6 8 2 0 0016 Cant 180v47 8746 2Yy aes 8 2 cpoos 171825 2 Qs 51514181211 s 16060402 505 20 0 O CHASSIS SCHEMATIC DIAGRAM sv DC coo ceo usar 350200 ms 83320144 RTB 2 356 ZTV expetere als 1 3454 o 8 DIN amp PIN CORD pm CAUTION SINCE THESE PARTS MARKED BY N ARE ATTENTION LES PIECES REPAREES PAR UN NOTE THIS SCHEMATIC DIAGRAM 15 THE LATEST AT THE TIME CRITICAL FOR SAFETY USE ONES DANGEREUSES AN POINT DE VUE SECURITE OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE DESCRIBED ON PARTS LIST ONLY N UTILISER QUE CELLES DECRITES DANS LA NOMENCLATURE DES PIECES M203 09 29 C R T P C BOARD MAIN P C BOARD DUIS a De Lac ERA pon _ 24042402 32 24054202 Cp003 D 4 c44i 040 500 CD003 100 2405380 a m o o t From CRT ie 1 R802 nd a E Cb001 a p 234 From PC z PC B002 MS0017A DIN Jack B SYNC E CD007 8GE 75001 J50 12 Jack HECO630 01 010 8613082 From DC Jack ah TO CRT PCB 16060402 503 505 Q504 506 8
24. ck DIN Socket D Sub 9 Jack RCA3 5 Socket IC 20 Pin DIL Socket IC 10 Pin DIL Jack D C Jack DIN Vol Rot 20k D C Cord Cord Connector Compact Floppy Disc Drive EME 155 R Network Exb P86222J R Network Exb P87681J Relay G4S 1112P 1 B 19 Speaker CO40KO1K2451 Crystal HC 18RW 16MHz No part numbers are given for any parts on PCB30001 should there be any electrical fault with that PCB Service Agents should return the whole Disc Drive Mechanism complete with the PCB for replacement 170101 40001 40025 170103 170104 170105 170106 170107 40080 40013 170113 170114 170448 170025 170023 170022 170021 170865 170024 170850 170807 170882 170862 190005 170860 170861 170123 170124 170859 21 GT65 EXPLODED VIEW Description Front Cabinet Cable Clamp Bracket Cabinet L Bracket Cabinet R Bracket P C B L Bracket P C B R C R T Green Metal Washer C R T Fixing Screw C R T Deflection Yoke C R T Socket Power Tx Rear Cabinet Control Knobs Button Power On Off Switch V Hold Pot Contrast Pot Brightness Pot D C Cord DIN Cord D C Jack u Metal Shield Qo O Q QG N CAUTION PARTS MARKED MUST NOT BE REMOVED UNDER NORMAL CIRCUMSTANCES GT65 CABINET PARTS LIST 5 170832 170512 SH 170831 170502 170504 170503 170505 170506 170507
25. e warranty period Service Agents must return the Disc Drive Mech anism complete with PCB30001 for replacement 150 INNER BEND OUTER 12V TO MONITOR TV gt pep ib ip eal 2 da Brae Pa COENA BANCA IO CONDITION WAIN SITH IS SWITCHED ON I CASSETTE CONTROL CIRCUIT DIAGRAM WORK A Bi NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME ATTENTION LES PIECES REPAREES UN ETANT CAUTION SINCE THESE PARTS MARKED BY ARE OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE DANGEREUSES AN POINT DE VUE SECURITE CRITICAL FOR SAFETY USE N UTILISERQUE CELLES DECRITES DESCRIBED ON PARTS LIST ONLY DANS LA NOMENCLATURE DES PIECES 1 3453 206 0 Description MECHANISM i Head Assembly Stepper Motor Stepper Motor Rotation Bolt Spindle Motor Flywheel Pulley Read Write Protect Index LED P C B Track OO Sensor Assembly Spring Loading Unit lt O O O O This drawing is for information only During the warranty period Service Agents must return the Disc Drive Mechanism complete with PCB30001 for replacement MECHANICAL REPLACEMENTS Head Assembly i Remove 2 screws from F panel and remove F panel i Remove 4 screws from the control PCB iii Disconnect plug from Stepper Motor iv Disconnect plug from LED P C B v Disconnect transistor from Spindle Motor vi Disconnect Index Sensor from fr
26. ead Output Thischeckis effective only when making write and read checkas described below If the outputlevelis less than the prescribed output clean the head before check Disk used for this check must be in good condition 1 Load the CE Disk 2 Select track 39 3 Connect one of the probes of the oscilloscope to TP1 of the printed circuit board another probe to TP2 and the probe to ground to TP3 TP11 ground Invert one channel and set it to Add input set input to AC and set the vertical axis to 50mV DIV and the horizontal axis to 20msec DIV 4 Make sure tha average output level is the following value or more 140 mV p p SN 25dB or more If the output is less than the above described value replace the head 4 Adjustment of Positioning 1 Load CE disk 2 Select Track 19 3 Monitor the output in the same way as the head output inspection Calculate the off track amount in reference to the calibration graph showing the interrelation between the burst amplitude ratio and off track amount Refer to Fig 5 2 4 The average of amplitude ratio should be below 26 um If it is not within this range make the following adjustment i Loosen the bolt of the rotation stopper which fixes the screw shaft Fig 6 3 Rotate the screw shaft and adjust it in such a way that the amplitude ratio may become below 15 uM Tentatively set the bolt at that position ii Make the to track step to the inner and outer circles and bring it to the
27. in a dim line of one prominent colour 3 Rotate the other two colours till a dim white line is obtained 4 Bring Ser Nor Switch to Nor position Black amp White Tracking Monitor Screen Monitor Oscilloscope Monitor connected to CPC664 If required adjust the colcur control If no satisfactory resuits repeat step 2 Adjust VR406 to obtain paper edge to be 145mm Vertical Size Program the paper Monitor Screen Use non magnetic ruler edge Adjust Focus Control on the Flyback Tx for maximum definition amp details Connect across C518 amp adjust VR501 to obtain 5V exactly Brightness amp Contrast controls set to normal viewing Focus Adjustment Program the paper Monitor Screen edge Switch on the Monitor 5V Adjustment AVO Meter This adjustment 6 should not be disturbed under normal conditions AN O Meter Connect A VO to collector Q802 Adjust VR402 to read 120V Rotate H Hold fully counterclockwise 1 Adjust VR404 to read 14500Hz 2 Adjust VR403 to read 15625Hz Keep Brightness Control to maximum position Read the Meter across CRT Heater amp Earth Sub Brightness Control Sub H Hold amp H Hold Adjustment Switch on the Monitor Switch on the Monitor Frequency Counter
28. nment 2F 125kHz 1 4 INDEX Fig 3 Waveform of T3 Azimuth alignment 12 0 05 35 0 5 3 5 0 5 2 2 F Track center rey e o MI 03 0 5 0 5 05 0 5 20 20 20 20 100 35 35 E i 05 0 0 5 72 48 48 72 j i j d j BLOCK1 BLOCK2 BLOCK 3 BLOCK 47 Index Aximuth burst 47 pair servo patters for positioning use burst Fig 4 Waveform of T39 ALIGNMENT CHECKS cont 1 Check Positioning 1 Load CE Disk 2 Set up track OO Motor off 3 Scope to TP5 4 Adjust OO Sensor 8 on Fig 6 so that scope shows correct difference as Fig 2 2 Adjustment of Index Timing 1 Load the CE Disk refer to disk info 2 Step the disk to the track 39 3 Synchronise the oscilloscope by TP9 INDEX Set the time base to 0 1msec DIV 4 Connect the probe to TP1 Connect the ground probe to TP3 and TP11 ground of PCB Set the input to AC and set the vertical axis to 20mV DIV 5 Measure timing between sweep start and an initial data pulse It should be 500 usec 500 usec When the timing is not within this range proceed with the following adjustment Refer to Fig 5 1 6 Loosen the tw screws fixed LED printed board Adjust the position of LED printed board so that the timing is 500 usec 100 usec 7 Re check the timing 8 Seek to the track OO and make sure that the timing is within 500 usec 200 usec Tighten the screws Fig 5 1 3 Check of H
29. ont of P C B vii Raise P C B from side opposite LED and remove plug from head viii Control P C B will now be free remove ix Remove 4 screws securing the Loading Unit to the chassis from the Flywheel side and remove Loading Unit x Remove spring and rod support screws xi Gently slide the head off the rod xii Replacement is reverse process After reassembly check alignment of Azimuth Burst Track OO Positioning Spindle Motor i Remove transistor fitted to Motor ii Unplug CN5 from Control P C B iii Remove Drive Belt iv Undo 2 screws securing motor v Replacement is reversal of removal vi Adjust VR201 so Index frequency is 200 2ms See Fig 5 1 Stepper Motor i Remove Control P C B as 1 ii Remove 2 securing screws for Stepper Motor Bracket iii Stepper Motor can now be removed iv After replacement index and positioning must be checked and amended as necessary 37 TECHNICAL SPECIFICATION LSI CHIPS Z80A processor running at 4MHz 128K bytes of RAM arranged in two 64K banks over 41K available to user in BASIC 61K available TPA to CP M Plus 48K bytes of ROM containing BASIC the operating system and disc extensions 6845 CRT controller device AY 3 8912 sound generator chip 3 voice 8 octaves 8255 parallel I O device 7653 floppy disc controller DISPLAY SPECIFICATION Display Mode Mode 1 Mode 2 Mode 3 No of colours 4 from 27 2 from 27 16 from 27 Vertical dots 200 200 200 H
30. original position Make sure that the adjustment is all right Then tighten the bolt 5 Confirmation of Head Azimuth 1 Load the CE Disk 2 Select Track 39 3 Synchronise the probe of the oscilloscope by TP9 of PCB and connect another probe to TP1 and the probe ground to TP3 TP11 ground Set the input to AC the vertical axis to 10 mV DIV and the horizontal axis to 0 5 msec DIV Make sure that the two outside burst waveforms are smaller than two inside burst waveforms as shown in Fig 5 3 Note Signal preceding the azimuth burst is the index burst If the azimuth is still incorrect reeplace the head assembly 15 16 CPC6128 MAIN PCB 17 SANNA 19 csv 26 op 7 D7 27 0 H 31 H H i DO b A11 6 8 AB O S LINKS 5 EXP EXPAN STON gt V SYNC eso 5 R145 10M 1 110 1 110 5 5 745132 7415132 9 11 OR oR 27 1 2 74HC132 RHI p gt gt 3 4 6 eLg Liag gt t 5165 4HCU04 2 s RESET O19 ocv 7 RIOME BK 0 RESET V x 9 15 5 a A14 4 5 z A12 amp 32 3 Ios car a AS 3 2604 NMI AB B Sq READY A7 lt 1 111 AS Z8400APS Ol _ 4 4 p BUSAK HALT A2 ZC SOCKET Al AQ De MREG M1 RESH 13 Q D7 D7 06 10 05 D4 53 E D2 Di DO 5y 11 Cc 123 2 gt TOR rs 5 TORD R
31. orizontal dots 320 640 160 Horizontal characters 40 80 20 KEYBOARD 74 Keys qwerty style numeric cluster cursor and copy cursor return enter shift caps lock tab delete clear control CASSETTE HANDLING Write speed software selectable 1K baud or 2K baud read speed automatically established by software Motor on off controlled by software ADD ON ABILITY Additional compact floppy disc drive system type FD 1 Centronics compatible printer Joystick s Various peripherals including up to 252 additional 16K ROMs EXTERNAL SOCKETS PCB edge connectors for general purpose expansion and Centronics parallel printer Disc drive 2 socket Use DI 2 connecting lead 9 Pin D type socket for joystick Amsoft type JY2 6 Pin DIN Socket for RGB and sync Luminance sync 5 Pin DIN socket for external cassette recorder Use 1 lead 3 5mm stereo socket for stereo sound output 5mm plug and lead to connect 12V disc power socket on the monitor 5mm socket for CPC6128 5v power supply supplied exclusively from monitor DIMENSIONS mm w h d Keyboard 510 48 170 CTM644 375 340 365 GT65 305 315 335 Joystick 90 170 100 Modulator 120 70 170 WEIGHTS Kg Keyboard 2 0 CTM644 10 6 GT65 6 3 Joystick 0 3 Modulator 1 4 POWER SUPPLY Screen System 240V AC 50Hz keyboard and disc drive power supplied by screen system CP M usually assumes an 80 column screen is available The CPC6128
32. ping with our policy of continually improving our service and the technical quality of our products we reserve the right to change component types manufacturers sources of supply or technical specification at any time Keyboard computer unit Colour Monitor Monochrome Monitor Designed in U K Made in Korea Joystick Designed in U K Made in Taiwan Power Supply Modulator Designed in U K Made in U K Software Written in U K and U S A Made in Korea and the U K CP M Plus CP M and Dr Logoare trade marks of Digital Research Inc AMSTRAD AMSOFT AMSDOS CPC464 and CPC6128 are trademarks of AMSTRAD Consumer Electronics PLC AMSTRAD CONSUMER ELECTRONICS plc Brentwood House 169 Kings Road Brentwood Essex CM14 4EF Telephone 0277 228888
33. sc access Both formats use the same framework but have different sector configurations Common to all Single sided double density 512 byte sector size 40 tracks Sectors interleaved 2 1 SYSTEM format The most frequently used format since CP M 2 2 and CP M Plus may only be loaded from a system format disc 2K is used for the directory and 9K reserved for the system 9 sectors per track 2 reserved tracks for CP M 169K byte file capacity DATA only format All the tracks are used to store data 2K bytes reserved for the directory 9 sectors per track No reserved tracks 178K byte file capacity The CPC6128 is compatible with programs developed for Amstrad CP M 2 2 and will run Amstrad CP M 2 2 discs Programs developed specifically for CP M Plus with GSX will not run on Amstrad CP M 2 2 The term CP M Plus is synonymous with CP M 3 0 Either side an AMSTRAD CP M Plus or AMSDOS disc may be accessed by the disc controller depending on which way round the disc is inserted Please note that while every care has been taken to ensure compatibility with existing CP M software some packages available make use of undocumented features of the CP M operating system and these may not be supported by the CPC6128 implementation Protected cassette files may not be occupied on disc and care should be taken to observe the copyright conditions of any software when transfering programmes between cassette and disc In kee
34. the page can be adjusted with VR703 and The adjustments are Linearity Graphics Bottom of the page can be adjusted with VR702 amp V Size respectively 5 Centering Adjustment Program Border 26 Monitor Screen Adjust the magnet on the back of the neck to centre the border 24 47ohm 82ohm 1000hm 330ohm 390ohm 470o0hm 6800hm 1kohm 1k5ohm 2k20hm 2k7ohm 3k3ohm 3k9ohm 4k7ohm 5k6ohm 8k2ohm 10kohm 15kohm 22kohm 33kohm 39kohm 47kohm 56kohm 22o0hm 1k5ohm 22Mohm 1ohm 1W 4ohm7 2W 120hm 2W 10ohm W 100pF 200pF 0 001 uF 0 0047uF 0 047uF 1uF 160V 2 2uF 50V 4 7 uF 50V 10uF 16V 10uF 25V 10uF 160V 22uF 16V 22uF 63V 33uF 10V 47uF 16V 100uF 25V 220uF 10V 220uF 16V 330uF 25V 1000uF 10V 3300uF 25V 4700uF 16V Carbon Film Resistors 4W Carbon Film Resistors V2W Metal Film Resistors 0 220hm 2W Fuse Type Resistor R715 Ceramic Capacitors Electrolytic Capacitors Circuit Reference R723 R721 R616 618 R613 R619 722 R603 605 606 720 R602 604 711 R506 508 510 601 609 730 R501 717 R620 R612 621 705 R502 R610 701 702 716 718 R504 714 R503 R713 R611 707 712 725 R706 R710 R731 732 R704 R719 R726 R727 R509 615 R728 729 R708 R505 R614 R724 C603 C604 C724 C726 C501 508 C730 C717 C703 719 C511 513 516 705 707 713 C712 C731 C706 C602 C

Amstrad CPC6128 service manual

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