PRICE: 8.00

CONTENTSSafety TestKeyboard Exploded View and Parts ListCPC6128 Basic Hardware AnalysisFunction DiagramsFunction DiagramsSoftware ErrorsDiagnostic Flow ChartAlignment ChecksCPC6128 Main PCBCPC6128 CPU Circuit DiagramElectrical Parts ListGT65 Exploded View and Cabinet Parts ListGT65 Circuit Diagram and VoltagesGT65 Main PCB and Alignment InstructionsGT65 Electrical Parts ListCTM644 Cabinet Drawing and Electrical Parts ListCTM644 Electrical Parts List and Alignment InstructionsCTM644 Electrical Parts List and VoltagesCTM644 Circuit DiagramMain PCBInterface Circuit DiagramDisc Control Circuit DiagramCassette Control Circuit DiagramMechanism and Mechanical ReplacementsTechnical Specification

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8,9,10,1112,13,14,15

16,17,1819,20

2122232425262728

29,3031,3233,3435,36

3637

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2

SAFETY TESTAll Monitors are safety tested to the following specifications.1). Flash TestTest at 3kV between the live and neutral of the mains lead joined together andand ALL accessible metal points on the exterior of the set.2). Insulation Resistance TestTest between the live and neutral of the mains lead joined together and ALLaccessible metal points on the exterior of the set to show a resistance of atleast 4Mohm.If after servicing there is any doubt about continued electrical safety the abovetests should be carried out.

AMSTRAD CONSUMER ELECTRONICS PLCBRENTWOOD HOUSE, 169 KINGS ROAD, BRENTWOOD, ESSEX CM14 4EF.Telephone: Brentwood (0277) 228888. Telex: 995417 AMSELE G.

21

4

KEYBOARD EXPLODED VIEW

KEYBOARD PARTS LISTSym Description

1 Cabinet Top Assembly2 Frame FDD3 Knob Volume4 Cabinet Bottom5 Keyboard Assembly ESU-2446 Compact Floppy Disc Drive

EME-1557 Volume Rotary K121 LOlOT-20KB8 Jack RCA 3.5 HSJ1061-01-4409 User Port Socket HXC0730-0 1-010

10 Jack DIN TCS4450-01-10111 Jack DC HEC0470-01-63012 Jack DIN TCS4460-01-101113 Cord DC 1455040114 Relay G4S-1112P-1-B-1915 Cord Connector 8W6Q004A16 SpeakerC040K01K2451

Part No.170855170856170806170857170858190005

170807170022170023170850170024170025170822170123170862170124

CPC61 28 - BASICHARDWARE ANALYSIS

RED NOLED LIGHTS >----1_--------< FAULTY PCB

STILL

NO

ANYPICTUREAT ALL

?

{

FAULTY LED1---- BROKEN PCB TRACK

FAULTY CONNECTER

YES

5V NO CHECK FORDC PRESENT >-------l FAULTY CABLE

ON OR PLUG ASSYCABLE FROM MONITO

NORGB

VIDEO YESCONNECTOR >---t5l 'LK2'~"U

ELECTRICAL PARTS LIST

Circ. Ref. Description Part No.Carbon Film Resistors470hm R146-153, 161, 162 10020560hm R155,306 10022820hm R141 100301500hm R136 100361800hm R134 100372200hm R137 100402700hm R126, 128, 130 100425600hm R317 100506800hm R1 25, 127, 129, 135, 157, 158, 10052

3011kohm R113, 121-123, 132, 140,211, 10061

212,216,313,315,3211k50hm R124 100652k2ohm R102, 109, 110, 112,214 100693k30hm R131 100734k7ohm R144, 310,323 1007710kohm R114-117, 120, 133, 142,217, 10085

309,31218kohm R308,311 1009122kohm R118,119,304,305 1009347kohm R302, 303, 307, 319, 320 10101470kohm R3141Mohm R111 101473M30hm R101 17086710Mohm R143,145 1708684ohm7 V4W Fuse R322 170866100ohm1f2W R316 1400183Ceramic Capacitors15pF C137,138 170869220pF C139-141,310 400107270pF C313 170126470pF C306 240040.1 uF C101-135,201-213 24020Electrolytic Capacitors1uF/50V C309,311,314,317,318 2006222uF/10V C308 2002547uF/10V C136, 303, 306 1400244100uF/10V C301,304 20028100uF/16V C315 20028Polycarbonate Capacitors (All working voltage 50V D.C.)0.001 uF C312 1702170.01 uF C305 1701280.047uF C318 14091780.068uF C302 1701290.1 uF C319 320 170851DiodesD1 01,303,304 1S2472-HS 170115D201 DS442XFA5 170816D301 10E1 170865D302 SLP-155B (R) 170866

Circ. Ref. Description Part No.IC'sIC101 HD74LS145 170101IC102 AY-3-8912 40001IC103 TMM-23256P-1953 40025IC104, 105, 109, HD74LS153 170103113IC106 HD74LS273 170104IC107 M5L8255AP-5 170105IC108 HD6845SP 170106IC110,210 HD74LS132 170107IC111 Z8400APS 40080IC112,207 HD74LS32 40013IC114 HD74LS373 170108IC115 HD74LS244 170109IC116 HSG3130/3170 40010IC117 TC74HCU04P 40008/AIC11 e PAL 16L8AC 40031IC119-134 MSM3764-20RS 170110IC201 UPD765AC-2 40018IC202 FDC9216BT 170812IC203 SN74HC240N 170863IC204 TMM-23128P-1851 40015IC205 DN74LS08 40011IC206,208 DN74LS38 40019IC209 DN74LS136 40016IC211 DN74LS27 40012IC212 DN74LS74 40014IC213 TC74HC161 P 170864IC301 LA4140 170111IC302 LA6358S 170814Tra nsistorsQ101 /2SC2120Y 170113Q1 02,301,302 2SC1815Y 170114W303 2SC950Y 170448MiscellaneousJ101 Jack DIN 170025J102 Socket D Sub 9 170023J103 Jack RCA3.5 170022J104, 105 Socket IC 20 Pin DIL 170021J106 Socket IC 10 Pin DIL 170865J301 Jack DC. 170024J302 Jack DIN 170850VR301 Vol. Rot. 20k 170807CD302 D.C. Cord 170882CD201 Cord Connector 170862FDD201 Compact Floppy Disc 190005

Drive EME-155NR101 R. Network Exb P86222J 170860NR201 R. Network Exb P87681 J 170861RY301 Relay G4S-1112P-1-B-19 170123SP301 Speaker C040K01 K2451 170124X101 Crystal HC-18RW 16MHz 170859

No part numbers are given for any parts on PCB30001, should there be any electricalfault with that PCB Service Agents should return the whole Disc Drive Mechanismcomplete with the PCB for replacement.

21

GT65 CABINET EXPLODED VIEW

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CAUTION! PARTS MARKED MUST NOT BE REMOVEDUNDER NORMAL CIRCUMSTANCES

7

GT65 CABINET PARTS LISTSym Description Part No.

1 Front Cabinet 1708312 Cable Clamp 1705023 Bracket Cabinet (L) 1705044 Bracket Cabinet (R) 1705035 Bracket P.C.B. (L) 1705056 Bracket P.C.B. (R) 1705067 C.R.T. Green 1705078 Metal Washer C.R.T. 1705089 Fixing Screw C.RT 170509

10 Deflection Yoke 17051011 C.RT Socket 17051112 Power Tx. S/17083213 Rear Cabinet 17051314 Control Knobs 17051415 Button Power 17051516 On/Off Switch 17051617 V. Hold Pot. 17083318 Contrast Pot. 17051819 Brightness Pot. 17051920 D.C. Cord 17031621 DIN Cord 17031722 D.C. Jack 17083423 u Metal Shield 170512/SH

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GT65 ELECTRICAL PARTS LIST

Value Circuit Reference Part No.Carbon Film Resistors (V4W)470hm R723 10021820hm R721 100301000hm R616-618 100323300hm R613 100443900hm R619,722 100464700hm R603-605,606,720 100486800hm R602,604,711 100521kohm R506-508, 510,601,609, 10061

7301k50hm R501,717 100652k2ohm R620 100692k7ohm R612,621,705 100683k30hm R502 100733k90hm R610, 701, 702, 716, 718 100754k7ohm R504,714 100775k6ohm R503 100798k2ohm R713 1008310kohm R611, 707, 712, 725 1008515kohm R706 1008922kohm R710 1009333kohm R731,732 1009739kohm R704 1009947kohm R719 1010156kohm R726 10103

Carbon Film Resistors (V2W)220hm R727 1706011k50hm R509,615 142212622Mohm R728,729 170602

Metal Film Resistors1ohm/1W R708 1706030.22ohm/2W R505 1706044ohm7/2W R614 17060512ohm/2W R724 170606Fuse Type Resistor

I10ohm/1f2W IR715 809256Ceramic Capacitors100pF C603 1422144200pF C604 4001070.001 uF C724 14001250.0047uF C726 1706000.047uF C501-508 24015Electrolytic Capacitors1uF/160V C730 14221512.2uF/50V C717 8092464.7uF/50V C703,719 140024010uF/16V C511-513, 516, 705, 707, 20024

71310uF/25V C712 2003710uF/160V C731 17060822uF/16V C706 2002522uF/63V C602 17060933uF/10V C710 17061047uF/16V C720 1400244100uF/25V C517 800370220uF/10V C709 170611220uF/16V C727, 728, 732 20029330uF/25V C515 I 1708361000uF/1 OV IC711 8003723300uF/25V C510 1706124700uF/16V C509,514 170613Polystyrene Capacitors (All 50V. D.C. W.)0.0047uF C715 1704370.0068uF C714 170614O.0082uF C723 1706150.01 uF C718 1704390.022uF C721 1706160.033uF C725 1706170.047uF C701, 702, 708, 716 1704220.082uF C722 170618

Value Circuit Reference Part No.Polypropylene Capacitors0.0033uF/630V IC733 1706190.068uF/400V C729 170620Tantalum Capacitors1uF/25V I C704 I 170621Circuit Ref. Description Part No.I.C.sIC501 L78MG - OEC 170446IC502 L78MG 170446IC701 UPC1 031 H2 170622IC503 I UPC78M12 1422278Transistors0501,502 2SD313 500050503,505, KTA1015Y 170453603,6040504,506, KTC1815 170447601,602,7010605 KTC2229Y 1706240702 KTA950Y 1704480703 2SD1159 170623DiodesD501-508 I Reel. 30D - IFC I 170625D509 Reel. 10D - 1 1400125D601 Zen. RD47FB 170626D602,701 Sili. DS442X - BT 1422117D603 Zen. RD56FB 170627D702,703 Ger.IN34A 170628D704 Reel. V09C 170629D705 Reel. V06C 170630D706 Reel. B B-4 1422116D707 Reel. 10D-2 1400123Coils & TransformersL701 D.Y.71011202 170510L702 Linearity CL. 21000006 170631L703 Horizontal C.L. 305Y001 170632L704 C.L. 100uH 1400148T501 Power Tx. 0766001 E S/170832T701 H.Drive Tx. RB20852 170633T704 F.B./Lopt 2012003 170835Variable ResistorsVR501 S.F.500ohm 1422189VR502,703 S.F.2k 1400230VR601 ROT. 1k 170518VR602 ROT 10k 170519VR604,605 S.F.50k 920142VR701 ROT 30k 170833VR702 S.F. 10k 1422191MiscellaneousCD501 D.C. Cord IG060401 170316CD601 D.I.N. Cord 8GE 70001 170817F502 4A(T) Fuse 1400254F503 2A (T) Fuse 1400253TH701 Thermistor SDT-250S 170635V701 C.R.T. 31 OGNB31 170507

'-

,

25

2021

13

CTM644 CABINET DRAWING

MECHANICAL EXPLODED VIEW

CTM644 CABINET PARTS LIST

26

Sym Description Part No.1 Front Cabinet 1708412 Control Knob Brightness 1703044 Button On/Off 1703054 Power On/Off Switch 1703065 Brightness Control 1703156 Degauss Coil 1708427 C.R.T. 1703078 Deflection Yoke 1703089 C.R.T. Socket 170843

10 Metal Washer Bottom 140001111 Rubber Washer 1400012j 12 Metal Washer Top 140001113 Fixing Screw 140001314 Static Rings 17031115 Handle 17031216 Rear Cabinet 17031317 Handle Retainer 17031418 F.B.T.x. 17046719 V. Hold Control 140003520 D.C. Cord 170316/A21 DIN Cord 170317/A23 D.C. Jack 17084424 Service Normal Switch 900101

CTM644 ELECTRICAL PARTS LIST

Value Circuit Reference Part No.Carbon Film Resistors (all1f4W unless otherwise shown)1000hm R810, 901-903 100322200hm R407,416 100402700hm R807,811,814 100423300hm R401, 404, 422 100443900hm R414 100464700hm R505,510 100481kohm R411,423,432,519,815, 10061

8161k50hm R420, 421, 441 100651k80hm R402,403,442 100672k2ohm R410 100692k7ohm R904-906 100684k7ohm R426,518 100776k8ohm R415 100818k2ohm R406, 41 8, 41 9 1008310kohm R424,428,429 1008512kohm R409 1008715kohm R431,450 1008927kohm R425 10095

47kohm R412,440 1010156kohm R417 1010382kohm R430,439 10107180kohm R408 10115220kohm R413 10117270kohm R504 10119680kohm R451 101291ohm2/1f2W R443 170401470ohm/1f2W R445 1422125680ohm/1f2W R447 8092231kohm/1hW R514-517 14001651k50hm/1f2W R448 14221262k2ohm/1hW R446 1704022k7ohm/1hW R802-804 1400166180kohm/1f2W R506,507 1704031Mohm R801 1400171Fuse Type Resistors1ohm/%W R521 8092528.2ohm/%W R444 17040410ohm/%W R511 8092560.82ohm/1W R438 437, 14221412.2ohm/1W R435, 1400184Cement Resistors5.6ohm/5W IR501 I 1422138150hm/7W R436 170417

Value Circuit Reference r Part No.1Metal Oxide Resistors120ohm/1 W R449 1704051kohm/1 W R503 1704063k90hm/1W R505 17040715kohm/1 W R805,812 1704080.22ohm/2W R513 170409150hm/2W R512 170410330hm/2W R509 17041182ohm/2W R520 170412100ohm/2W R433 1704133k30hm/2W R427 1704146k8ohm/2W R405 1704151ohm/3W R502 170416

-

Electrolytic Capacitors1uF/50V C414 200621uF/160V C419 14221511uF/250V C506 14221524.7uF/50V C407,420 140024010uF/16V C520 2002422uF/10V C437 17041822uF/250V C430 17041947uF/10V C436 17042047uF/16V C405,418 140024447uF/50V C512 17042147uF/160V C401 170422100uF/16V C412,443,523 20028100uF/35V C425 1422157100uF/160V C515 1400246100uF/400V C505 170423220uF/35V C507 20055220uF/160V C515 170851470uF/10V C518 170424470uF/25V C435,519 20044470uF/35V C402,522 14222622200uF/25V C424 170425Ceramic Capacitors22pF/500V C416 1400217100pF/500V C423,441 1400218130pF C806 170426180pF/500V C403 170427240pF C804 170428270pF/2kV C432 170429330pF C803,807 1422255560pF/500V C417 1400220680pF C802 14002132200pF/4kV C513 1704300.001 uF/500V C516,521 1704310.001 uF/2kV C511,801 14221470.0015uF/2kV C510,514 1704320.0022uF/2kV C502-504 14002230.0047uF C508,509 170433

CTM644 ALIGNMENT INSTRUCTIONS

STEP FUNCTION SIGNAL IN SIGNAL OUT METHOD REMARKS1. Black and White Monitor Screen. 1. Turn R & B Drive Controls VRS04 & VRS05 fully Monitor connected to CPC664.

Tracking. counterclockwise.2. Turn R, G & B Bias Controls VRS01, S02, S03 fullycounterclockwise.3. Set Ser. Nor. Switch to Ser. position.

2. Black & White Monitor Screen. 1. Adjust 120V at the collector of OS02 with Monitor connected to CPC664.Tracking. Monitor Oscilloscope. Brightness Control on the Oscilloscope.

2 Rotate the screen control to fully counterclockwise& bring it back to obtain a dim line of oneprominent colour.3. Rotate the other two colours till a dim white lineis obtained. If required, adjust the colcur4. Bring Ser. Nor. Switch to Nor. position. control.

3. If no satisfactory results repeat step 2.4. Vertical Size. Program the paper Monitor Screen. Adjust VR406 to obtain paper edge to be 145mm. Use non magnetic ruler.

edge.5. Focus Adjustment. Program the paper Monitor Screen. Adjust Focus Control on the Flyback Tx. for maximum Brightness & Contrast controls

edge. definition & details. set to normal viewing.6. 5V Adjustment Switch on the Monitor. AVO Meter. Connect AVO. across C51S & adjust VR501 to

obtain 5V exactly.This adjustment (6) should not be disturbed under normal conditions.

7. Sub Brightness Switch on the Monitor. AVO. Meter. Connect AVO. to collector of OS02. Adjust VR402 Keep Brightness Control toControl. to read 120V. maximum position.

S. Sub H. Hold & Switch on the Monitor. Frequency Counter. Rotate H. Hold fully counterclockwise. Read the Meter across CRTH. Hold Adjustment. 1. Adjust VR404 to read 14500Hz. Heater & Earth.

2. Adjust VR403 to read 15625Hz

27

CTM644 ELECTRICAL PARTS LIST

Value Circuit Reference Part No.Polypropylene Capacitors0.012uF/1600V IC431 1704340.1 uF/250V C501 14002020.82uF/200V C429 170435

Polystyrene Capacitors0.001 uF C442 1708500.0015uF C408 1704360.0047uF C421 1704370.0056uF C415 1704380.01 uF C413,427 170439O.015uF C409 1704410.039uF C404 1704400.047uF C406 1704420.Oo8uF C41J, 422, 428 170443Tantalum Capacitors1uF/16V IC411 r4002252.2"uF/16V 1400226C426I.C.sIC401 LA7800 1400106IC402 LA7830/UPC1378 170444IC501 STK7308 170445IC502 L78MG 170446IC503 UPC78M12 1422278

Circuit Ref. Description Part No.Transistors0401,402, KTC1815Y 170447504,5060403 KTA950Y 1704480404 2SC2271 170449Q405 2SD1397 1704500501 2SD1207 1704510502 2SD880Y 1704520503,505 KTA1015Y 1704530801-803 2SC3417 170454

Circuit Ref. Description Part No.Diodes --

D401 Sil. IS2472T 170455D402,403 Zen. RB11 EB 1400124D404, 506, 508 Rect. DFC1 OE 1422115D405, 407, 408 Sil. TVR 06K 170456D406 Rect. BB-4 1422116D501-504 Rect. 20E1 0 170848D505,507 Zen. RD 3.6FB 170458D509 Rect. RGP 30J 170459D510 Zen. SR2M 1400122D511,512 Rect. RU4A 170460D901-903 Zen. GZA6.2Y 1422114Coils &TransformersL401 Li nearity Coil 1431 MS 1400145L501 Line Filter FKOB 160MH14 1400130L502 Degauss Coil 170842

L801 Coil 100uH 1400148T401 H. Drive 305Y001 170463T402 Pin Cushion 1432MS 170464T501 Switching Tx. 8142006 170845SwitchesSW401 ISlide Switch I

900101SW501 Power On/Off Switch 170306Variable ResistorsVR401 Rot. 5000hm 170315VR402 S.F.5k 1400227VR403 S.F.5k 1400227VR404 S.F.2k 1400230VR405 Rot. 20k 1400035VR406,407 S.F. 1k 170466VR801 S.F. 5k (R) 1400197VR802 S.F. 5k (G) 1400198VR803 S.F. 5k (B) 1400199VR804 S.F. 5000hm (R) 1400200VR805 S.F. 5000hm (B) 1400201MiscellaneousFB401 FB/LOPT 3714004 170467F501 Fuse 2A (T) 1400253TH501 Degauss Element 1400195

ERP.F5BOM180HV001 C.R.T. 3701 B22-TC20 170307J501 D.C. Jack 170844J801 C.R.T. Socket 170843

HPS0092-01-030

CTM644 VOLTAGES

28

IC401 . LA78001 - 6.35V DC2 - 6.48V DC3 - 0.32V DC4 - OV DC5 - OV DC6 - 0.85V DC7 - 3.21V DC8 - 0.33V DC9 - 0.93V DC

10 - 5.55V DC11 - 0.96V DC12-11.04VDC13 - 0.89V DC14 - 11.18V DC15 - 12.43V DC16-4.11VDC

IC402 . LA7830/UPC13781 - OV DC2 - 12.74V DC3 - 24.4V DC4 - 0.84V DC5 - OV DC6 - 24.2V DC7 - 2.5V DC

IC502 - LM78M61 - 18V DC2 - OV DC3 - 5.4V DC4 - 5.0V DC

Q405 - 2501397E - OV DCB-0.1VDCC - 98.8V DCQ404 2SC2271E - OV DCB - 0.3V DCC - 34.1V DC

CTM644 CIRCUIT DIAGRAM

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INTERFACE CIRCUIT DIAGRAM

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DISC CONTROL CIRCUIT DIAGRAM

WARNING: This Circuit Diagramis for information only. During thewarranty period Service Agentsmust return the Disc Drive Mech-anism complete with PCB30001for replacement.

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10

DescriptionHead AssemblyStepper MotorStepper Motor Rotation BoltSpindle MotorFlywheelPulleyRead/Write Protect/Index/LED P.C.B.Track 00 Sensor AssemblySpringLoading Unit

MECHANICAL REPLACEMENTS

5

MECHANISM

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10

This drawing is for information only. Duringthe warranty period Service Agents mustreturn the Disc Drive Mechanism completewith PCB30001 for replacement.

6

I

Head Assemblyi) Remove 2 screws from F. panel and remove F. panel.ii) 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 front 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 removeLoading 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 00 Positioning.

Spindle Motori) Remove transistor fitled 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 Motori) 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

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 2 K baud, read speedautomatically established by software. Motor on/off controlled bysoftware.

POWER SUPPLY:Screen System: 240V AC 50Hz (keyboard and disc drive powersupplied by screen system).CP/M usually assumes an 80 column screen is available. TheCPC6128's ability to present text in 80 column format is a prerequisitefor the majority of CP/M applications.

DIMENSIONS (mm):w h d

Keyboard 510 48 170CTM644 375 340 365GT65 305 315 335Joystick 90 170 100Modulator 120 70 170WEIGHTS (Kg):Keyboard 2.0CTM644 10.6GT65 6.3Joystick 0.3Modulator 1.4

Disc System Specification:The disc drive is a 3 inch system, conforming to the Hitachi!Panasonic standard. The software is configured for a 12mS steprate, and 30mS settling time.The system is designed to control a maximum of 2 drives. A ROMcontains the extensions for AMSDOS and the machine dependentelements 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 slidinto position as required.

AMSDOS & CP/M PlusAMSDOS is a disc operating system which expands LocomotiveBASIC, adding additional commands to make full use of the disc files.AMSDOS enables BASIC programs to access disc files in the samemanner as cassette files, in fact the same commands are used withfile names conforming to CP/M and CP/M Plus conventions.AMSDOS and CP/M both share the same file structure and can readand write each other's files. The Digital Research CP/M Plusoperating system is supplied with the CPC6128, permitting the userto access the wealth of applications software written to run underCP/M. In addition to the usual CP/M Plus utilities, additionalfeatures 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 disc access. Both formats use thesame framework, but have different sector configurations.Common to all:Single-sided, double density.51 2 byte sector size.40 tracks.Sectors interleaved 2: 1.SYSTEM format:The most frequently used f6rmat, since CP/M 2.2 and CP/M Plusmay only be loaded from a system format disc. 2K is used for thedirectory, 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 AmstradCP/M 2.2 and will run Amstrad CP/M 2.2 discs. Programs developedspecifically for CP/M Plus with GSX will not run on Amstrad CP/M2.2. The term CP/M Plus is synonymous with CP/M 3.0.Either side 01an AMSTRAD CP/M Plus or AMSDOS disc may beaccessed by the disc controller, depending on which way round thedisc is inserted.Please note that while every care has been taken to ensurecompatibility with existing CP/M software, some packages availablemake 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 careshould be taken to observe the copyright conditions of any softwarewhen transfering programmes between cassette and disc.In keeping with our policy of continually improving our service, andthe technical quality of our products, we reserve the right to changecomponent types, manufacturers, sources of supply or technicalspecification at any time.Keyboard/computer unit, Colour Monitor, Monochrome Monitor-Designed in UK., Made in Korea.Joystick - Designed in UK., Made in Taiwan.Power Supply/Modulator - Designed in UK., Made in UK.Software - Written in UK. and US.A., Made in Korea and t'he UK.CP/M Plus, CP/M and Dr Logo are trade marks of Digital Research Inc.AMSTRAD, AMSOFT, AMSDOS, CPC464, and CPC6128 are trademarksof AMSTRAD Consumer Electronics PLe.

Mode 316 from 27

20016020

Mode 22 from 27

20064080

LSI CHIPS:Z80A128K

48K

processor running at 4MHzbytes of RAM arranged in two 64K banks (over 41 Kavailable to user in BASIC, 61 K available TPA toCP/M Plus)bytes of ROM containing BASIC, the operating systemand disc extensions

6845 CRT controller deviceAY38912 sound generator chip 3 voice, 8 octaves8255 parallel I/O device7653 floppy disc controllerDISPLAY SPECIFICATION:Display Mode Mode 1No. of colours 4 from 27Vertical dots 200Horizontal dots 320Horizontal characters 40

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 Centronicsparallel 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 + sync5 Pin DIN socket for external cassette recorder. (Use CL 1 lead).3.5mm stereo socket for stereo sound output.5mm plug and lead to connect 12V (disc) power socket on themonitor.5mm socket for CPC6128 5v power supply (supplied exclusivelyfrom monitor).

AMSTRAD CONSUMER ELECTRONICS pic.,Brentwood House, 169 Kings Road,Brentwood, Essex CM14 4EF.Telephone: (0277) 228888

ContentsSafety TestKeyboard Exploded ViewCPC6128 - Basic Hardware AnalysisFunction DiagramsCPC6128 Function DiagramsSoftware ErrorsDiagnostic Flow ChartAlignment ChecksCPC6128 Main PCBCPC6128 CPU Circuit DiagramElectrical Parts ListGT65 Cabinet Exploded ViewGT65 Circuit DiagramGT65 Voltage DataGT65 Main PCBGT65 Alignment InstructionsGT65 Electrical Parts ListCTM644 Cabinet DrawingCTM644 Cabinet Parts ListCTM644 Electrical Parts ListCTM644 Alignment InstructionsCTM644 Electrical Parts ListCTM644 VoltagesCTM644 Circuit DiagramsCTM644 Main PCBInterface Circuit DiagramDisc Control Circuit DiagramDisc Control MechanismTechnical Specification