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Commodore Plus 4, Service Manual

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Commodore Plus 4 Service Manual Download Page 2

CONTENTS

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SCHEMATIC

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SPECIFICA TIONS

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OVERVIEW

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PRODUCT PARTS LIST

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CASEWORK

IDENTIFICATION

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PCB LAYOUT

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PCB PARTS LIST

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PCB SCHEMATIC

DIAGRAMS

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KEYBOARD MATRIX

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I.C. PINOUTS FOR UNCOMMON

CHIPS

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SCHEMATIC

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iii/iv

Summary of Contents for Plus 4

Page 1: ...on con tained herein The listing of any available replace ment part herein does not constitute inany case arecommendation warranty or guaranty as to quality or suitability of such replacement part Rep...

Page 2: ...1 22 33 33 44 55 77 77 99 11 11 12 12 Title SPECIFICA TIONS OVERVIEW PRODUCT PARTS LIST CASEWORK IDENTIFICATION PCB LAYOUT PCB PARTS LIST PCB SCHEMATIC DIAGRAMS KEYBOARD MATRIX I C PINOUTS FOR UNCOMMO...

Page 3: ...rs High resolution graphics Split screen text high resolution graphics Multicolor graphics RESOLUTION 320 x200 Pixels SOUND 2Tone generators or 1Tone and 1 white noise generator VOLUME 8Volume levels...

Page 4: ...eved bythe 7360 TED chip 64K bytes of dynamic RAM areaccomplished by 8 64K x 1 I C s See page The system program iscontained in2 16K x 8 ROMs The system supports up to 128K x 8 of ROMbanked in16K sect...

Page 5: ...C251655 01 C251855 01 C251856 01 BOTTOM CASE ASSY Bottom Case Foot Self Adhesive Paper Shield Shield Chip Shield Plate Insulation Sheet C251454 01 C950157 04 C310156 01 C310199 01 C310197 01 C310198...

Page 6: ...aa 1 c CD I _ _ oo Q _ oo I C s en Q en CD iE oo I...

Page 7: ...P 3 I ntll c li mm oo CP IT II U12 QQII UIJ II U14 r 11 U13 r II U 6 II U15 I9 1 U7 17 II U 8 c zs oo 1 JJ III LL CC J r NN NN NN IIUB Lr t II C n c II O oj m ll oo C mm oor I F B FBS oo mm oj nn oo m...

Page 8: ...4 U5 RESISTORS All values are inohms 1 4 WW 5 unless noted otherwise 74LS04 7406 555 74LS257 4164 2 D RAM 7700 01 0PLA 74LS139 74LS175 74LS27 2312B ROMTED Basic U6 U7 U8 U9 10 U11 18 U19 U20 U21 U22 U...

Page 9: ...818 MHZ 251081 01 Sub Crystal 14 31818 MHZ 251081 02 Crystal 1 8432 MHZ 900555 02 Switch Rocker C251587 01 PC Mount Switch Push Button C251260 01 RF Modulator C251844 01 Sub RF Modulator 251311 01 FB2...

Page 10: ...no 16 25 17 24 18 23 19 22 20 21 cj OIN RDY IRQ AEC VCC AA AA A2 A3 A4 A5 A6 A7 A8 A9 A1 A11 A12 A13 GND KEYBOARD MATRIX RES R W D0 D1 D2 D3 D4 D5 D6 D7 P0 P1 P2 P3 P4 P5 P6 GATE IN A15 A14 A2 A1 A0...

Page 11: ...i ZZ DO 1Tl zz nn II f nn L _ i EE z L J 1 I 1d 1 JJ NN L I rNl OJ 0 vv r Jo ZZ oo nn FBZl nn oo 00 oo l lJ 00 DD DD oo Ih ICJ uu 0 ZZ z oo I I li E1 l lJ c NN U1 JJ gg 1 1 152 I I bdc I if I J U1 II...

Page 12: ...ION tDLY DELAY 500 ns IRQ PROPAGATION tlRQ DELAY CLEAR 500 ns SYNERTEK ISYP6551A 12MHZ FE 17 16 15 14 13 12 I1 IQ F7 F6 F5 F4 GND PIN CONFIGURATION 11 28 22 27 33 26 44 25 55 24 66 23 77 22 88 21 99 2...

Page 13: ...D 0 IT1 Gl IHf nn INI II IUJ It lllnr zZOCOJ 005S Ai _Z ZZ S X 0 oo CC rr oo Il x T I SS ZZ D nn nO Orr 5 s 00 cc os 000 cc CC l l i A III r L r 2 II r D OJ OJ rr CC s r oo rr III ZZ oo I 11 0 I n OJ...

Page 14: ...1 SIEMENS HYB4164 3 200 330 150 20 901505 01 SHARP LH2164 Z1 200 330 248 28 901505 01 HIT ACHI HM4864AP 3 200 330 242 20 901505 01 TOSHIBA TMM4164AP 20 200 330 275 22 vss CAS DOUT A6 A3 A4 A5 A7 U11 1...

Page 15: ......

Page 16: ...55 24 66 23 77 23128 22 88 21 99 20 10 19 11 18 12 17 13 16 14 15 VCC CS 33 A13 A8 A9 A11 CS A1CIJ CS 22 D8 D7 D6 D5 D4 U23 318006 01 ROM BASIC PIN CONFIGURATION 11 28 22 27 33 26 44 25 55 24 66 23 7...

Page 17: ...tHI zz tI IIII11 II11 1 4 c fJl en IIII IIII II rr I r C D 33 111 r Q _ tD ootDl It l WW trd n fr J 00 II I II 00 I6 ioo i N oro u 0 NN CC I CJ l J rZC _r I z t OL l 6 NN l IS 00 IIIICOl lO Xl 1JIC 0...

Page 18: ...R2J 0 QQ cc II J 31 J 2K sol II 2 2k C2 c22 vv IIXJP OP C20 COMPONENT PARTSVALUE RR n CC F 2200r 2S R26 p3 6 81 6 8k p Q3 Q4 2SC460 OR EQUIVALENT Q1 Q2 2SC1684 OR EQUIVALENT LLff I COLO IN LUH IN RF...

Page 19: ...Cl6 CIFi LL 7 22P O J 2P __ leI I 33P 11 LL H 4I Q 221 I 9 i j Q L 88 55 1 1 y II R2J 2 21 C2 04 II L OJ vv C22 CC 20 0 lQ P 2200 2S R 2 as 6JJJ 1 8 I t Pj RF our LL HH Q1 Q2 2SC1684 OR EQUIVALENT 03...

Page 20: ...sted caps just outside of RF can 1 NO VIDEO Absolutely no video on screen A Check for 5volts O K If not 1 Check fuse 2 Check for twisted or bent caps 5V short to ground 3 Check Ll B Check for oscillat...

Page 21: ...Jump out RAM to verify F Check multiplexers U9 UIO signals at RP3 and RP4 should be similar in frequency and amplitude O K If not 1 Suspect U9or U10 G Check ROM for chip select signal at p in 22 of U2...

Page 22: ...Out signal If not 1 Check Ml operation CN7 pin 6to see if color signal 1 Check for shorts 6 NO SOUND or BAD SOUND A Check Ul pin 33 for SND signal O K If not 1 Check socket for open circuit 2 Swap Ul...

Page 23: ...LURES IN SOFTWARE MODE All units should be checked for proper operation when any repairs are necessary To Check 1 Press Fl on keyboard 2 Press Return to enter Word Processing mode 3 Press Commodore ke...

Page 24: ...ster Clock Single Phase 14 31818 MHz Chroma Output Composite Chroma and Luma Chip Enable Chip Select Low ROM Chip Select High ROM Chip Select Cassette Motor Control Cassette Read Cassette Sensor Casse...

Page 25: ...d PCB Layout for the C 64 in the Service Manual Pages 28 and 32 includethese diodes However the C 16 and Plus 44Service Manuals were completed before the changes were made The Schematiccorrectionsare...

Page 26: ...Commodore Plus 4 Home Computer Service Manual dated October 1984 Scanned by Matt Karls of Karls Technology for our Computer History archive...

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