Tech Manual - Commodore16.com
Contents
1. PARTS LIST PLUS 4 PCB ASSEMBLY 310163 01 Continued CAPACITORS Continued MISCELLANEOUS Continued Ceramic 220 pF 50V Sub FB2 14 Ferrite bead 325563 01 251071 26 Sub 15 21 Ferrite bead 303025 01 Ceramic 220 pF 5OV 900463 08 FB22 26 Ceramic 150 pF 251071 24 28 38 Ferrite Dead 325563 01 Sub FB40 Ceramic 150 pF 50V 900482 41 FB41 58 Ferrite bead 903025 01 Ceramic 0 1 25V 251075 01 59 Ferrite bead 325563 01 Ceramic 0 1 25V 251075 06 6 Ferrite bead 903025 01 10 16V 900100 25 FB61 63 Ferrite bead 325563 01 Ceramic 0 01 25V 251075 01 FB64 65 Ferrite bead 903025 01 Elect 10 pF t6V 900100 25 Ceramic 0 1 aF 25V 251075 06 EM 1 2 EMI Filter 251842 01 Elect 10 16V 900100 25 Elect 1 16V 900100 16 Connector 4 power supply Ceramic 0 1 af 25V 251075 06 251614 01 10 16 900100 25 CN2 Connector 6 PIN DIN serial bus Ceramic 0 1 25V 251075 06 C 903361 01 Elect 10 aF 16v 900100 25 CN3 Connector 7 PIN MINI DIN cassette Ceramic 0 1 aF 25V 251075 06 C 251616 01 Ceramic 0 22 25V 251075 07 CN4 Connector 50 PIN Female Edge Sub exoab 251630 01 Ceramic 0 22 50V 900022 01 CN5 6 Connector 8 PIN MINI DIN Ceramic 0 1 aF 900020 06 joy 1 amp 2 C 251258 01 Sub Connector 8 PIN audio video Ceramic 0 1 aF 9000010 01 325573 01 Ceramic 0 1 pF 900010 20 CNE Connector 18 PI2. 37 ood P 12 i re a 115130 xog 3 2 N us Iai 555 E ETH nm aging 2 10 Ts H 1 130 2 DNIB3O105 XV guit NULLV 335 commodore TECHTOPICS Model PLUS 4 t 1980 COMMODORE BUSINESS MACHINES Ix Issue 6 1984 Computer 3 Troubleshooting Aides NOTE Visual inspection is critical in this unit The upright position of many of the components used on the board can create problems It is possible for them to be Shorted to the shieid or to each other Make sure they are evenly spaced and do not contact the shield Areas of the PCB particularly vulnerable to this probiem are Bottom right corner caps Bottom center 71 26 Bottom left Q3 shorted to FB57 Top left ferrite beads Center Twisted caps just outside of RF can 1 NO VIDEO Absolutely no video on screen A Check for 5 voits Q K If not 1 Check fuse 2 Check for twisted or bent caps Y 5 V short to ground 3 Check L1 B Check for oscillation at pin 14 of Ul O K not 1 Check for good connection at pin 14 of Ul 2 Check for good connection at Rl thru R7 C Check for LUM signal at pin 23 of Ul at pin 4 of the modulator at pin 8 of the mo
3. 5 Title 0 tp SPECIFICATIONS 1 2 1 4 4 4 4 6 666 EE enn OVERVIEW 400 6 PRODUCT PARTS LIST nnns CASEWORK IDENTIFICATION esses nenne I me e hh Immerhin eese nnns LAYOUT 66 he a d nnn PARTS LIST 1 112 0 000 4 1 6 60 eese tanen na SCHEMATIC DIAGRAMS KEYBOARD MATRIX no ens PINOUTS FOR UNCOMMON CHIPS RF MODULATOR 251844 LAYOUT 4 41 1 2 1 41 2 023 2 251844 SCHEMATIC RF MODULATOR 251311 LAYOUT 5 4 4 251311 SCHEMATIC mom q 43 ee AAN GMG ManMed ao n mmm 7 Wow 4d Pod Eo h d mom m ae FFEN OB d oh x ox om O98 8 HOS TR H3 OR OROR 8 d oH on od wow wo d J h do wo mun wo q g dj d 5 oh mom m Tp n N op p H8 d od d mo wo mom m om wow RR RN d ol d dC o mom s m p pom BOW d NS ow m g k Fa BOE
4. ROM con taining the built in productivity software MICROPROCESSOR 7501 Microprocessor 89 or 1 76 MHz clock DISPLAY 40 Columns x 25 lines of text COLORS 128 Colors 16 colors 8 luminance levels CHARACTERS Upper amp lower case letters numerals and symbols Reverse and flashing charachters PET graphic characters DISPLAY MODES Text characters High resolution graphics Split screen text high resolution graphics Muiticolor graphics RESOLUTION 320 x 200 Pixels SOUND 2 Tone generators or 1 Tone and 1 white noise generator VOLUME 8 Volume levels KEYBOARD Full size typewriter style design KEYS 67 Keys total 4 Cursor control keys 4 Programmed reprogrammable function keys up to 8 user defined functions possible Color control keys HELP key Upper and lower case character set Graphics character set INPUTS OUTPUTS PLUS 4 MODEM User port Serial port ROM cartridge and parallel disk drive port 2 Joystick ports C1531 Cassette drive interface port RF Output channel 3 or 4 Video output composite chrominance luminance Audio input output Power supply input PLUS 4 PRODUCT SPECIFICATION Continued FEATURES Built in extended BASIC 3 5 over 75 commands Built in Machine Language monitor over 12 commands Built in graphics and sound commands Screen window capability Reset button Warm start Built in integrated productivity software PERIPHERALS C1551 Fast Disk
5. Sod dod BON a ow pog dom hb h hd SERVICE MANUAL MODEL PLUS 4 COMPUTER Preliminary OCT 1984 PN 314001 04 Commodore Business Machines Inc 2 1200 Wilson Drive West Chester Pennsylvania 19380 U S A Commodore makes no expressed or implied war ranties with regard to the information contained herein The information is made available solely on an as is basis and the entire risk as to quality and accuracy is with the user Commodore shail not be for any consequential or incidental damages in connection with the use of the information con tained herein The listing of any available replace ment part herein does not constitute in any case recommendation warranty or guaranty as to quality or suitability of such replacement part Reproduction or use without expressed permission of editorial or pictorial content in any matter is prohibited This manual contains copyrighted and proprietary information No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the prior written permis sion of Commodore Electronics Limited Copyright 1984 by Commodore Electronics Limited rights reserved PLUS 4 PRODUCT SPECIFICATION MEMORY 64K RAM 60K RAM User accessibie for BASIC programs ROM 32K ROM Standard includes operating system and BASIC interpreter with 32K
6. 3135 lgan 1 530 THAOS N3a0 9 18 55 LMOHS Lf ANO 153135 QNnOS 22 KC dto HOM 13 lt mao 1615194 Zi 25 Tbe 41 2 15 lt ___ 125 G 5 224 len SLIS Tbe se aes A63 NOI LONT14 sen mi k2 Lr gy gt 14340 COLOR IN 107 IN AUDIO IN PHONO JACK VIEW REAR VIEW COLOR OUT LUM oUT O COMP OUT CVS Rif 2 lt 8 50 ORF OUT Cr CAE 22 22 220 CO 220 22 22 272 GROUND C24 PIKE P COMPONENT PARTS VALUE R 0 F H 03 04 2SC460 OR EQUIVALENT 1 02 2SC1684 OR EQUIVALENT D3 D4 155198 OR EQUIVALENT D2 188110 OR EQUIVALENT D1 188119 OR EQUIVALENT pe oo SC eese oorr si SYNC LUM SIG OUTPUT Ww RF OUTPUT CHANNEL SELECT SW Mad CHE CAG DETAIL EH RF Modulator Layout and Schematic 251844 11 COLOR IN O LUM IN AUDIO IN Q ROA PHONO JACK 27 A3Kk R2k 2 COLOR OUT R2t 65 0 097 22 229 22 fOO 222 ROUND COMPONENT PARTS VALUE 0 F 04 25 460 OR EQUIVALENT Q1 02 28C1684 OR EQUIVALENT
7. MODULATOR OUT Ape 4 MI LUM iN To FB3 SICOLOR IN LUM OUT 9 TER SND COLOR GND COMP OUT 5 z lt m ced O M ID px FBG gt 5 RIS RIG 2 2402 XA FBI 2 4 5 As ida Josue cs NC NC gt CLK IN 5 Q 5 gt 8 gt 4 m FB I FBI2 z 0 7406 leas pes gt 3 Qa 250880 FBH gt w CR AQ A15 08 0 C1 LOW BRESET RAS Po HIGH C2 C HIGH csi CSO CAS BA AEC Plus 4 Schematic 310164 2 014 gt AI 8 FBS FBIG FBI RAMEN NC 5V NC resa NC 95 lt x m ZZ 0DU 31 34 MOA 23NNCZO 3903 PINOUTS PAGE 8 RATION COMMODORE APPROVED PART SOURCE 1 NUMBER OF SUPPLY HITACHI 901505 01 sees om _ 18 MATSUSHITA OCK ATOR R W SWITCH p OCK 9 ATOR MEMORY MEMORY ARRAY a ARRAY OCK E o ROW DEC K p GROW DEC TOR lt gt lt MEMORY MEMORY lt I ARRAY _ ARRAY gt e Ying O 7 a Of fj SS gt ki a 4 ME
8. D3 D4 188198 OR EQUIVALENT D2 155110 OR EQUIVALENT D1 188119 OR EQUIVALENT zr 1 TOP VIEW uid ds DETAIL CH SN REAR VIEW o emas 5 x coors sme SG outeur o won RF Modulator Layout and Schematic 251311 12 Issue 7 1984 Model 16 PLUS 4 LINE DEFINITIONS AO to 15 AEC ATN BA BRESET Cl HIGH Cl LOW C2 HIGH C2 LOW CAS CLK IN COLOR COMP CE CS 50 CSi CST MTR CST RD CST SENSE CST WRT CTS to DB DCD DRAM DRAM ADD DSR DTR EXT AUDIO GATE IN IRQ to K7 KERN LUM MUX PO to P7 RAS RxC RxD R W RTS SND TED TxD 0 2 Computer 4 E commodore TECHTOPICS 1980 COMMODORE BUSINESS MACIUNES INC Address Bit O to 15 Address Enable Control Attention Bus Available Buffered System Reset External Cartridge Chip Select Dynamic RAM Column Address Strobe Master 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 Cassette Write Clear To Send Data Bit O to 7 Data Carrier Detect Dynamic RAM Dynamic RAM Address Data Set Ready Data Terminal Ready External Audio Input R W GATE Interupt Request Keyboard Latch 0 to 7 Kernal ROM Control Line Composite S
9. 1j Check for shorts to ground 2 Check switch 3 Check power supply 4 BAD BASIC Random characters on screen Random colors Power up message is missing Check Basic ROM U23 B Check B thru I above Bad Video PLUS 4 Troubleshooting Page 3 gt NO COLOR or BAD COLOR Check 1 pin 14 for 14 31818 MHz with frequency counter not 1 Check solder joints of and adjust for correct frequency 2 Check crystal 91 and 92 3 Check clock circuit for opens or shorts B Check UI pin 13 for Color Out signal not 1 Swap Ul w known good Check modulator Ml pin 5 for Color In signal and pin 6 for Color Out signal not 1 Check operation 2 Check FB4 and CN pin 6 to see if color signal is present 1 Check for shorts 6 NO SOUND or BAD SOUND A Check Ul pin 33 for SND signal not 1 Check Socket for open circuit 2 Swap Ul w known good B Check audio circuit for short to ground or loss of signal not 1 Check 03 sure emitter and are not Shorted to 5 V Check modulator 1 pin 2 for SND signal 1 Adjust can right of modulator for clean loud volume 2 Mi pin 2 to ground should read approximately 480 ohms 3 Check 1 for component failure 7 SERIAL FAILURES A Check FB23 26 for shorts to shield or each other B Check U7 02 PLUS 4 Troubleshooting Page 4 8 KEYBOARD FAILURES A Ch
10. 97 LyM 152 Ly amp v 1525141 NLY Qui C3 282 3719933 Nig 9 71918395 Dut vu 23v 39 198 12527 tb 4 M4 SCHEMATIC PAGE 11 TRANSMIT RECIEVE CHARACTERISTICS PIN CONFIGURATION CHARACTERTISTICS TRANSMIT RECEIVE CLOCK HIGH TIME TRANSMIT RECEIVE CLOCK LOW TIME CL XTL1 TO TXD PROPAGATION DELAY DD RTS PROPAGATION DELAY DLY IRQ PROPAGATION DELAY CLEAR 1 2 3 4 b 6 7 8 9 tr 10 to ns Baud Rate with External Clocking 15 BAUD RATE 1 U3 901895 02 16 x ACIA SYNERTEK SYP6551A 2 MHZ PIN PIN CONFIGURATION CONFIGURATION 4 10 PORT 3 4 L ORT TO 4 5 D 6 H 6 7 7 8 L LOW LEVEL 9 HIGH LEVEL 10 X IRREVELANT Mos 65295 ami U5 U27 251640 03 oF SINGLE PORT U19 251641 02 INTERFACE PLA L UM COLOR SND R2 Y 14 31818 MHZ NTSC R1 17 73447 PAL 4 TK 7 CST RD CST WRT 51 SENSE a t REG 1 1 AMP L1 CRI POWER PIN DIN 1 Q AAC T ET 4 LZZ H V 5 1 2501815 cis RI Ra 412 419 g ut G2 25C18i5 2501815 RA 2201 5 RF
11. MORY Z Q MEMORY w ARRAY ARRAY 9 u Q u o m Row DECK d NROW DEC E E ARRAY lt O FUNCTIONAL DIAGRAM VENDOR PART NUMBER 901505 01 NEC 04164 2 901505 01 MITSUBISHI M5K416NS 20 beers m pom _ ACCESS TIME ns CYCLES ACTIVE STANDBY ns MW gt DATA IN Buffer OPIN DATA OUT BUFFER lt lt 55 QA 275 22 2 MALE ELGE Pi Bb mE t 591 01 snjg 59 412 Liat ait nir alee QN9 DT 10 sew BASIL 3 m z 9Ir gin 92637 CJ C l1SIv tv s CL JSN3S 150 C qum 135 383 C 13595 gt our C 0 C amp Y2 C PIN CONFIGURATION 1 2 3 4 5 6 7 8 9 U23 318006 01 ROM BASIC PIN CONFIGURATION OM NAA AWN U24 318005 04 ROM KERNAL t 9 t 79 01 SPd 152 NHAN C 252 2 1462346 5 SSTINN 53108 43835 92 42 v 9 1
12. N keyboard 251841 01 Crystal 14 31818 MHZ 251081 01 Noise 2512540 Sub Sub 251701 01 Crystal 14 31818 MHZ 251081 02 Sub Crystal 1 8432 MHZ 900555 02 1313 Coil Inductor 1 2 901152 01 Sub 325570 01 Switch Rocker 251587 01 Mount F1 Fuse 250V 1 5A 903556 18 Switch Push Button C 251260 01 Fuse Clip 905102 01 Cartridge Guide 3104 71 01 RF Modulator 25184401 Shield Box C 310172 01 Sub Shield Cap C 310173 01 RF Modulator 251311 01 C Commodore Stock Part 90 02 9 02 7 i 14 LI H gt H SHIFT LOCK il 1 2 3 A 5 6 7 8 9 CO C om ff to PIN ASSIGNMENT PIN ASSIGNMENT U2 251536 01 U1 251535 01 CUSTOM MICROPROCESSOR VLSI TEXT DISPLAY TED 94 50102 ONS 981 180 57 ato ri y 3 fee i AGHO D 2 522 T r T rol I 2 p v e Of Gc et Se 2 87 04 8 4 6 991 152 55 92 I 7 INI XT Ais T IA 3 du IY Zv Y QV pr t B z xni I 542 gya 2 pz NIS SY INI W 8 2 AS 31YW14 81 C lt 1140443 HOLDANNOS C LL xls ivt gt Qu 152 v gt 152 g ec Q 3SN3S 1 2 2
13. drive C1531 Datasette MPS 802 Dot matrix printer MP5 803 Dot matrix printer DPS 1101 Daisy wheel printer C1802 colar monitor OTHER PERIPHERALS C1541 Disk drive MPS 801 Dot matrix printer C1702 color monitor PLUS 4 OVERVIEW The Plus 4 system is based on the 7501 microprocessor an HMOS verston of the 6510 Video pro cessing is achieved by the 7360 TED chip 64K bytes of dynamic RAM are accomplished by 8 64K 1 1 5 See page The system program is contained 2 16K x 8 ROMs The system supports up to 128K x 8 of ROM banked in 16K sections By software control through the 7350 ROM can be completely banked out and RAM banked in for a true 64K of RAM minus 256 byte pages allaw ing 60 671 bytes available for BASIC Keyboard and joystick scanning are accomplished by outputting the row data on the data bus while addressing a particular register in the TED chip This will in turn cause the TED chip to latch the column information A standard Serial port supports serial bus peripherals such as the 1541 disk drive and the various serial printers A cassette port is provided and the expansion port supports ROM cartrdiges TTL serial ASCII is intended to drive an RS 232 adapter TOP CASE ASSY Top Case Keyboard 67 Key KKR 1 Nameplate Shield Clip shield Clip BOTTOM CASE ASSY Bottom Case Foot Self Adhesive Paper Shield Shield Chip Shield Plate Insulation Sheet ACCESSORIES Users Manual Power S
14. dulator at FB3 and at pinl of CN7 not 1 Check for LUM signal shorted to ground 2 Check for open traces 3 Check modulator D Check for reset Check for control signals Signal Pin Signal Ul 35 R W Ul 7 02 4 0 Ul 12 5 Ul 11 MUX Ul 9 CS1 Ul 6 IRO Ul 8 51 720 15 RDY U2 2 cso Ul 5 Ul 34 50 120 1 5 Ul 10 PLUS 4 Troubleshooting Page 2 2 BAD VIDEO Scrolling lines on screen Random blocks on screen Blurred display A B C D G H 1 Check 21 26 for shorts to ground or each other Check reset for correct operation Check for proper operation not 1 Check socket for good solder 2 Check for bad Ul Check U2 for proper operation O K If not 1 Check socket 2 Check for bad U2 Check RAM data lines for correct amplitude O K If not 1 Check for hot surface of RAM Y 2 Jump out RAM to verify Check multiplexers U9 signals at RP3 and RP4 should be similar in frequency and amplitude not 1 Suspect 09 1310 Check ROM for chip select signal at pin 22 of 123 and 124 If not 1 Check for signal generation at 020 Check that all ROM addresses are present and correct amplitude Vu If not 1 Trace problem address AQ Al5 Check U19 U23 U24 by replacement with known good 3 NO POWER A Verify voltage 5 and 49 volts
15. eck pins on ribbon cable for good connection Check for shorts 5 CN6 FB s Diodes OK Check chip select to U27 and the 27 D Check 01 for proper operation net 1 Check socket 2 Check for bad Ul 9 FAILURES IN SOFTWARE MODE All units should be checked for proper operation when any repairs are necessary To Check 1 Press on keyboard 2 Press Return to enter Word Processing mode 3 Press Commodore key and key at the same time 4 and press Return to enter Spreadsheet 5 Press Commodore key and key again 6 Type tw to return to Word Processing mode Watch for video or loading probiems then Check jumpers at J1 J6 for correct connection O K B Check Ul U2 U25 U26 PARTS LIST PLUS 4 PCB ASSEMBLY 310163 01 Commodore part numbers are provided for reference only and do not indicate the availability of parts from Commodore Industry standard parts Resistors Capacitors Connectors should be secured locally Approved cross references for TTL chips Transistors etc will be available in manual form through the Service Department in November of 1984 Unique or non standard parts will be stocked by Commodore and are indicated on the parts list by INTEGRATED CIRCUITS 7360 VLSI Text Dislay Sub 251535 01 8360 251535 02 7501 Custom Micr
16. oprocessor 251536 01 Synertek 901895 02 741508 901521 03 65298 Single Port Interface 251640 03 741504 901521 02 7406 901522 06 555 901523 01 7415257 901521 57 4164 2 D RAM 901505 01 7700 010 251641 02 7415139 901521 18 7415175 901521 34 741527 901521 22 23128 ROM TED Basic 318006 01 23128 ROM Kerna 318005 04 23128 FUNCTION ROM 3 1 LOW 317053 01 23128 FUNCTION ROM 3 HIGH C 317054 01 65298 Single Port interface C 251640 03 TRANSISTORS Q1 Q3 25 1815 902693 01 Q4 250 880 902694 01 Sub Tip 29A 902653 01 Sub 250 1266 902694 04 Bridge Rectifiers 52 10 Sindengen 215026 01 Sub Bridge Recitifers 2 Sanyo 251026 02 Sub DIODES Continued 1 2 CR11 20 Bridge Rectifiers 20 Sanyo Diode Diode Diode 251026 03 Zener RD 6 8 900927 01 IN 914 Sub 900850 16 IN 4148 Taping 251819 21 Sub 300850 01 Diode iN 4148 RESISTORS All values are ohms 1 4 W 5 unless noted otherwise RESISTOR PACK RP1 2 4 CAPACITORS 3 3K 6 PIN 68 8 PIN 4 ISOLATED 902441 29 326149 06 Elect 0 1 aF 25V 900100 40 Ceramic 0 1 25V 251075 06 Film 0 22 pF 100 800150 11 Film 0 22 pF 100V 800150 11 Ceramic 0 22 pF 900022 01 Elect 2200 16V 900101 33 Elect 10 pF 16V 900100 25 Ceramic 0 1 aF 25V 251075 06 Timmer 40 pF 251029 02 251070 14 Ceramic 22 pF 50V
17. upply RF Cable switch Box PARTS LIST PLUS 4 36320 02 0070000 C o0 00 251453 01 251501 01 251655 01 251855 01 251856 01 251454 01 35015 7 04 310156 01 310199 01 310197 01 310198 01 310196 01 310157 326189 02 904 778 01 C Commodore Stock Part J x et wi a 4 AERE 1 LE lime k ar 4 zm t i wm sss per Ti a di n ie eee 2 D ond k a I 4 F a pe 32 o F k ar m a es wax u 7 77 0 7 tion Flus 4 Casewerk tdentifica A quiassy 804 snid ani 40 LW MJA 3015 1 11 1191301 514 Z 55 Bod SQUID SST 5 TRO vas auva 29 1 1va gos 10 31 JALA wu BALLA 1 95309 3335 0105 TYNI EL E 129 4 830108 d 915 5 mg E 6 Cre 11139 BG 3018 34155 a 11139 2 4 90 T
18. ync and Luminence Address Multiplex Control Port Bit 7 Dynamic RAM Row Address Strobe system Reset Receive Clock Receive Data Read Write Line Request To Send Sound Line Text Display Transmit Data System Clock Varies between 1 and 2 MHz Artificial 2 Address Valid Rising Edge Data Valid Falling Edge
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