Commodore PLUS 4 Service Manual
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Commodore PLUS 4 Service Manual

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SERVICE MANUAL
MODEL PLUS 4 COMPUTER
OCT. 1984
Commodore Business Machines,
1200 Wilson Drive, West
Commodore makes noexpressed or
ranties with regardtothe information
herein. The information
an as is basis, and the entire risk asto quality
accuracy iswith the user.
liable for any consequential
in connection
with the useof
tained herein.
The listing of
ment part herein does not
arecommendation,
quality
or suitability
Reproduction or usewithout
of editorial or pictorial content,
prohibited.
This manual contains copyrighted
of this publication
may bereproduced,
transmitted
in any
form or
photocopying,
recording orotherwise,
sion of Commodore
Electronics Limited.
Copyright
©©
1984 by Commodore
All rights reserved.
PN-314001-04
Inc.
Chester, Pennsylvania19380 U.S.A.
implied war-
contained
ismadeavailable solely on
Commodore shall not be
or incidental damages
the information
con-
any available replace-
constitute
inany case
warranty
or guaranty
as to
of such replacement
part.
expressed permission,
inany matter
and proprietary
information.
stored in a retrieval
by any means, electronic,
without the priorwritten
Electronics Limited.
and
is
No part
system, or
mechanical,
permis-

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Summary of Contents for Commodore PLUS 4

  • Page 1 SERVICE MANUAL MODEL PLUS 4 COMPUTER PN-314001-04 OCT. 1984 Commodore Business Machines, Inc. 1200 Wilson Drive, West Chester, Pennsylvania19380 U.S.A. Commodore makes noexpressed or implied war- ranties with regardtothe information contained herein. The information ismadeavailable solely on an as is basis, and the entire risk asto quality accuracy iswith the user.
  • Page 2 CONTENTS Page Title SPECIFICA TIONS •••••••• •••••• •••••••••• •••••••••••••••••••• •• •• •• •• •••••• •••••••••••• •••••••• •••••••• •••••• •••• •••••••••••• •• •• •• •• •• •• •••••••••• •••••••• •••••••• •• •• •• •• •• •• •• •• •• •• •• ••...
  • Page 3 PLUS 4 PRODUCT SPECIFICATION MEMORY 64K RAM. 60K RAMUser accessible for BASIC programs. 32K ROM Standard (includes operating system andBASIC interpreter) with 32K additional ROM con- taining the built-in productivity software. MICROPROCESSOR 7501 Microprocessor -- .89 or 1.76 MHz clock.

  • Page 4: Other Peripherals

    Daisy wheel printer, C1802 color monitor. OTHER PERIPHERALS C1541 Disk drive, MPS 801 Dot matrix printer, C1702 color monitor. PLUS 4 OVERVIEW The Plus 4 system isbased on the 7501 microprocessor, anHMOS version of the 6510. Video pro- cessing is achieved bythe 7360 TED chip.
  • Page 5 Shield Clip, FF BOTTOM CASE ASSY C251454-01 Bottom Case C950157-04 Foot, Self-Adhesive C310156-01 Paper Shield C310199-01 Shield Chip C310197-01 Shield Plate C310198-01 Insulation Sheet ACCESSORIES C310196-01 Users Manual C310157 Power Supply C326189-02 RF Cable C904778-01 Switch Box Commodore Stock Part...
  • Page 6 •• •• •• •• "'C (") ;:I;" :::::I .._..:::::I...
  • Page 7 11II 01--- ~~ Dl __ r--I ----.-.., :s:: <..L..L __ mm F"B~ ::II "II :s:: Q"a" r:::fB7 »» FB34l-}FB1O ... ~B;:' L-------------~~~-1.~ »» ." 00 <~ ..<< II )) 1------11 :JJ ..., ..., << -ht' »» -< '"...

  • Page 8: Parts List

    PARTS LIST- PLUS/4 PCBASSEMBLY #310163-01 PLEASE NOTE: Commodore part numbers are provided for reference only and donot indicate the availability of parts from Commodore. Industry standard parts(Resistors, Capacitors, Connectors) should besecured locally. Approved cross-references for TTL chips, Transistors, etc. will beavailable in manual...
  • Page 9 Coil Inductor 1.2 uHpt L3,L3 325570-01 Sub: Switch, Rocker C251587-01 (PC Mount) 903556-18 Fuse 250V 1.5A Switch, Push Button C251260-01 906102-01 Fuse Clip 310171-01 Cartridge Guide RF Modulator C251844-01 C310172-01 Shield Box Sub: C310173-01 Shield Cap RF Modulator 251311-01 Commodore Stock Part...

  • Page 10: Shift Lock

    CTRL) STOP,. SPACE f-j\ SHIFT ...I. \!...} .," •• "" t:j"1\ "" RR SHIFT LOCK T:It "' "V ""Q ..., "" "" i"" ...K of'O 1;;: ~-o. 'P"" -EI; =\1/ ,ESC ¢¢ ,DEL RETUR~00. '" HELP KEYBOARD MATRIX \..4 I<J cj>OIN -A10 -A11...
  • Page 11 '" J> •• •• ." "' << '" •• •• << 0< .Ih~ '" '" l.lJ '" ..., '" z:>- l.lJ '" oo ... ,..I"" '" I:li':E1 "" L-----~_=i •z L------:-.J:-:1 ::1d" 1~1~ 152~ I~~~ bdc;; ;:; I", I<if;;: I-.J >1 <<...

  • Page 12: Pin Configuration

    TRANSMIT/RECIEVE CHARACTERISTICS M1 SCHEMATIC ON PAGE11 CONFIGURATION UNIT CHARACTERTISTICS -R/W -Q)2 CSQ) TRANSMIT /RECEIVE tCCY -IRQ CLOCK RATE TRANSMIT /RECEIVE CLOCK HIGH TIME XTL1 TRANSMIT/RECEIVE CLOCK LOW TIME XTLQ) 6551 TO TXD PROPAGATION DELAY RTS PROPAGATION tDLY -DQ) DELAY -DSR IRQ PROPAGATION tlRQ RSQ)
  • Page 13 rr rr >..•• r-, r> ..&& ~---,I-- 'II-- ---~-, $N UI --I- -QJJ 1S1)l I--I'~: ::>: -<~ 11.,., II 'V\I\,~. -------''\IV'V ~~ jj 11 ~~II 1"1 ____ -+_1> "" __ ..I -< '" ., II <'" "'- ____-1-- __ "_ 'Iµ...

  • Page 14: Functional Diagram

    U3, US, U19 PINOUTS ON PAGE8 CONFIGURATION POWER COMMODORE APPROVED VENDOR ACCESS -vss PART TIME CYCLES PART SOURCE ACTIVE STANDBY -CAS NUMBER OF SUPPLY NUMBER (ns) (ns) (MW) (MAX)(MW) -DOUT HM4864-3 901505-01 HITACHI A(JJ 901505-01 !-,PD4164-2 M5K416NS-20 901505-01 MITSUBISHI 901505-01...
  • Page 16 CONFIGURATION -VCC -A13 -A11 -CS, 23128 -A1CIJ ACIJ -- 13 U23-318006-01 ROM- BASIC CONFIGURATION -VCC -- 22 -A13 -A11 -CS, 23128 -A1CIJ ACIJ 1CIJ U24-318005-04 ROM- KERNAL...
  • Page 17 l> "" 1> &.. "" :Iln r>, l> ~" ..(") '" ,, ,, t" l> £)1 '" << oJh II II ..If-+-, J> << IGI-"I= ",tJ> -> l> 1> "" :/< '" <Jl '" '" '" '" '" IIH f- ..,J :...()

  • Page 18: Top View

    COLO~ IN "" "" .\:: -l.: COLOR <'('0 ""'- "> OJ >> ~'i) II(~ ;;UI OS 220{, <1<':> ;:'3'11' "" ';:ISO!' LUH IN '" ,, 000 /oµ '"~ ~<::> 11(", I\:~ C:J :'- COMP our Il)B $?<::> -3eJOP ~<::> 11(, I\(':!.
  • Page 19 QI'---~ "uoo COLOR IN ~..\,:..., .Roll C2~ 2.20f 'A" "" ..2201" LUI1 IN ~22P 10µY~t----:o;::,-"-+----' I\(~> ()..~ '" COMP OuT .JJOP (\)"':. 'i) \:) "\ 1\(, £! " > .."\ "" .., 1\(" fUa. <t,7)(-../0* I{,P CI2!~ RId ~~ CIS"...

  • Page 20: Troubleshooting

    Issue 6, 1984 :Computer Model: PLUS 44 ©© 1980 COMMODORE BUSINESS MACHINES INC. 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.
  • Page 21 PLUS 4Troubleshooting Page 22 2) BAD VIDEO -Scrolling lines on screen -Random blocks on screen -Blurred display A) Check JI-J6 for shorts to ground or each other O.K. •• B) Check reset for correct operation O.K. •• C) Check Ul for proper operation O.K.
  • Page 22 Page 33 PLUS 4Troubleshooting 5) NO COLOR or BAD COLOR pin 14 for 14.31818 MHz with A) Check frequency counter Check solder joints of CTI O.K. and adjust for correct frequency 2) Check crystal, Ql and Q2 3) Check clock circuit opens or shorts B) Check Ul pin 13...
  • Page 23 4) Type ltc' and press 'Return' to enter Spreadsheet 5) Press 'Commodore' key and 'C' key again 6) Type 'tw' to return to Word Processing mode Watch for video or loading problems, then: A) Check jumpers at JI-J6 for correct connection O.K•...
  • Page 24 .,. commodore •• computer 44 Issue 7, 1984 •• Model: C16, PLUS 44 1980 COMMODORE BUSINESS MACHINES INC. ©© LINE DEFINITIONS Address Bit 0to AO to A15 Address Enable Control Attention Bus Available Buffered System Reset BRESET External Cartridge Chip Select...
  • Page 25 C-16 SCHEMATIC F822 ,,J,.., ..-- -- N.C- FB23 SERIAL 7'10(0 FB24 FEMALE -U:;-9 DATA 0,12 FB25 <:9 FB'ZG, II/! 114><,3 C5T RD2(;, ".,. "" ..fI} 9,~lQ() :.".:0 -::.::""' ~::e CRiP+ <:5 C5T WRT t;;"" PLUS 4 SCHEMATIC...
  • Page 26 Commodore Plus/4 Home Computer Service Manual dated October 1984. Scanned by Matt Karls Karls Technology for our Computer History archive.

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