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SERVICE MANUAL
MODEL PLUS 4 COMPUTER
OCT. 1984 PN-314001-04
Commodore Business Machines, Inc.1200 Wilson Drive, West Chester, Pennsylvania 19380 U.S.A.
Commodore makes no expressed or implied war-ranties with regard to the information containedherein. The information is made available solely onan as is basis, and the entire risk as to quality andaccuracy is with the user. Commodore shall not beliable for any consequential or incidental damagesin connection with the use of the information con-tained herein. The listing of any available replace-ment part herein does not constitute in any casea recommendation, warranty or guaranty as toquality or suitability of such replacement part.Reproduction or use without expressed permission,of editorial or pictorial content, in any matter isprohibited.
This manual contains copyrighted and proprietary information. No partof this publication may be reproduced, stored in a retrieval system, ortransmitted 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.All rights reserved.
CONTENTS
RF MODULATOR 251844 LAYOUT .
251844 SCHEMATIC • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Page
1
2
3
3
4
5
7
7
9
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 UNCOMMON CHIPS •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
RF MODULATOR 251311 LAYOUT ..
251311 SCHEMATIC .
iii/iv
PLUS 4 PRODUCT SPECIFICATION
MEMORY
64K RAM. 60K RAM User accessible for BASIC programs.
ROM
32K ROM Standard (includes operating system and BASIC interpreter) with 32K additional 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).
CHARACTERSUpper & lower case letters, numerals and symbols. Reverse and flashing charachters. All PET graphiccharacters.
DISPLAY MODES
Text characters. High resolution graphics. Split screen text/high resolution graphics. Multicolor 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
KEYS67 Keys total. 4 Cursor control keys. 4 Programmed (reprogrammable) function keys (up to 8 userdefined functions possible). Color control keys. HELP key. Upper and lower case character set. Graphicscharacter set.
INPUTS/OUTPUTSPLUS/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.
1
PLUS 4 PRODUCT SPECIFICATION (Continued)
FEATURES
Built-in extended BASIC 3.5 - over 75 commands. Built-in Machine Language monitor - over 12commar.ds. Built-in graphics and sound commands. Screen window capability. Reset button (Warmstart). Built-in integrated productivity software.
PERIPHERALS
C1551 Fast Disk drive, C1531 Datasette, MPS 802 Dot matrix printer, MPS 803 Dot matrix printer,DPS 1101 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 is based on the 7501 microprocessor, an HMOS version of the 6510. Video pro-cessing is achieved by the 7360 TED chip. 64K bytes of dynamic RAM are accomplished by 8 (64Kx 1) I.C.'s. (See page ). The system program is contained in 2 (16K x 8) ROMs. The system supportsup to 128K x 8 of ROM banked in 16K sections. By software control, through the 7360, ROM canbe completely banked out and RAM banked in for a true 64K of RAM (minus 256 byte pages), allow-ing 60,671 bytes available for BASIC.
Keyboard and joystick scanning are accomplished by outputting the row data on the data bus whileaddressing a particular register in the TED chip. This will in turn cause the TED chip to latch the columninformation.
A standard serial port supports serial bus peripherals such as the 1541 disk drive and the variousserial printers. A cassette port is provided and the expansion port supports ROM cartrdiges. TTL serialASCII is intended to drive an RS-232 adapter.
2
PARTS LISTPLUS/4
TOP CASE ASSY
Top CaseKeyboard, 67 Key, KKR-INameplateShield Clip, RShield Clip, F
C 251453-01C 251501-01C 251655-01C 251855-01C 251856-01
BOTTOM CASE ASSY
Bottom CaseFoot, Self-AdhesivePaper ShieldShield ChipShield PlateInsulation Sheet
C 251454-01C 950157-04C 310156-01C 310199-01C 310197-01C 310198-01
ACCESSORIES
Users ManualPower SupplyRF CableSwitch Box
C 310196-01C 310157C 326189-02C 904778-01
C - Commodore Stock Part
a
••1-•
•
-c..CD:::::I...._.-_.oQ)...._.o:::::I
"'C-s::en~
(")Q)enCD:iEo~
;:I;"
~ Dl __ 1 I 01----oj mo 02:s:: 0< ...._ mm C):E til
CS N::II "II:s:: lii...
o til-."0 0nm m02 < -ojCO _ »m _
:E ..... »•»,»••
om-oj»-....m
•
~
•
••~
•
tilmm02o-ojm...
u\
FB4f88
fB2 1 Q"a" r:::fB7FB34l-}FB1O
~ .......?il ~B;:'N EMZ
L-------------~~~-1. ~1 un < 1 U20 < ~ (C' II ) :JJ ..., ..., (,) C's 1------11
o -< '" "" -ht' 30. -- ~ ;;;;;; ~ ~ 3,
L-;=R;::I:=~ L::.:J - (;) EM! ffiR2 @ +~) .;;r. ~L.__4 ,,0 c,; F8
111 '" '"
(C13 X CI2 ) r> I ~\: I '<>R3 ...
L3 \.gJ,....
11 +
..L..L
o
I U22 <@I UZI <~'-"
n6'
1 'I ......tilo....om::II
U(,3
U24 c:<N ."
[ll-~
U25
o -
-•
U Iq (
o
I UfO < Q I U9 < S'" I~'-'
1r-----'R"""'P"4--I 1'---'R=P"'3 --I
ntll»::c"li-m....o
-CPIT'
--• ---- .... -I U 12 < Q I UIJ < ~,'" ....~
I U 14 < r~11 U 13 < ~
-..,- ®+r'----']
,.,()..
I U \6 <@ I U 15 < I9'-"
1----:-U7:'17::----:><] I U\8 < ~
(c.zs )
o 1-
....:JJ-IIIL
C-Jr>
NN
<N
I UB ~Lr-t
I
C)nc»-::IIO-ojm::ll-o
C)m
o r--I ----.-..,
F"B~FBS
-om-oj»-....n
om-oj»-....Dl
::IIm»0::11mtII-oj-»O_m ....<n-m:E
2 1/.I>
D-'"."[ll-U1
."[JJ
"III-S'> .,.,[llUl[ll
-\III..-
o
c4>
-Ir.(CaB )
i i
+cU1
r"'"oL
v-,( C'<G )
om-oj»I=)FB9\ IXfB14 -....Dl
f")ZN
lA(C4'l )rRZ~I
-+RZS
R23R22
- -
o-
om-oj»-....m
om-oj»-....o
-til:E... o o
tilo....00mm::II-oj-»02-C) ....til 0-om
-
n02Ol
tilo....om::II-02C)
."DlW...
tilo....om::II-02C)
."DlWW
onDl-I>o
"IIC-oj-ojoCtilmonDlW(I)
"IIC-oj-ojoCtilmonDlN-..I
PARTS LIST - PLUS/4 PCB ASSEMBLY #310163-01
PLEASE NOTE: Commodore part numbers are provided for reference only and do not indicate theavailability 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 Departmentin November of 1984. Unique or non-standard parts will be stocked by Commodoreand are indicated on the parts list by a "C".
DIODES (Continued)INTEGRATED CIRCUITS
Bridge Rectifiers DBA20CSanyo 251026-03Diode, Zener RD 6.8 EB 900927-01Diode, IN 914 Sub: 900850-16Diode, IN 4148 Taping
251819-21 Sub:Diode, IN 4148 900850-01
CR1(cont.)CR2CR11-20
7360 VLSI, Text Dislay (TED)Sub: C 251535-018360 C 251535-027501 Custom Microprocessor
C 251536-016551 A (Synertek) 901895-0274LS08 901521-036529B Single Port Interface
C 251640-03901521-02901522-06901523-01901521-57901505-01C 251641-02901521-18901521-34901521-22
Ul
U2
U3U4U5
RESISTORS - All values are in ohms-1/4 W5% unless noted otherwise.74LS04
740655574LS2574164-2 D-RAM7700-01 0 PLA74LS13974LS17574LS272312B ROM TED Basic
U6U7U8U9-10U11-18U19U20U21U22U23
240250lOOK
1.5K47K
lOOK3K1K1KlK1K1K
R14R15R16R17R18R19R20R21R22R23R24R25
4.7K10K
470K220K
18K1.5K
470KlOOK
1K1K
12K10K
lK
RlR2R3R4R5R6R7R8R9Rl0R11R12R13
C 318006-0123128 ROM TED Kernal
C 318005-0423128 FUNCTION ROM, 3 + 1 LOW
C 317053-0123128 FUNCTION ROM, 3+HIGH
C 317054-016529B Single Port Interface
C 251640-03
U24
U25
U26 RESISTOR PACK
U27 3.3K, 6 PIN 902441-2968, 8 PIN 4 ISOLATED 326149-06
RP1, 2RP3,4
TRANSISTORS CAPACITORS
01-03 I 2SC 1815 902693-01 C1 Elect 0.1 µ,F 25V 900100-4004 I 2SD 880 902694-01 Sub: C2 Ceramic 0.1 µ,F25V 251075-06
Tip 29A 902653-01 Sub: C3 Film 0.22 µ,F 100V 900150-112SD 1266 902694-04 C4 Film 0.22 µ,F 100V 900150-11
C5-C6 Ceramic 0.22 µ,F 50V 900022-01DIODES I I C7 Elect 2200 µ,F 16V 900101-33
C8 Elect 10 µ,F 16V 900100-25CR1 I Bridge Rectifiers S2VB 10 Sindengen
C9 Ceramic 0.1 µ,F 25V 251075-06215026-01 Sub: C10 Trimmer 40 pF ! 251029-02Bridge Recitifers DBA20B Sanyo Cll Ceramic 22 pF 50V 251070-14251026-02 Sub:
5
PARTS LIST - PLUS/4PCB ASSEMBLY #310163-01 (Continued)
CAPACITORS (Continued) MISCELLANEOUS (Continued)
C12
C13
C14C15-C16C17-C18C19C20C21C22C23C24-C26C27C28-C29C30C31-C32C33-C40
C41-C51
C100
Ceramic 220 pF 50V251071-26 Sub:
220 pF 50V150 pF 50V
CeramicCeramicSub:CeramicCeramicCeramicCeramicCeramicElectCeramicElectElectCeramicElectCeramicElectCeramicCeramicSub:CeramicCeramicSub:Ceramic 0.1Ceramic 0.1
150 pF 50V0.1 µF25V0.1 µF 25V
10 µF 16V0.01 µF 25V
10 µF 16V0.1 µF 25V
10 µF 16V1 µF 16V
0.1 µF 25V10 µF 16V
0.1 µF 25V10 µF 16V
0.1 µF 25V0.22 µF 25V
0.22 µF 50V0.1 µF 50V
µF 50VµF 50V
MISCELLANEOUS
Y1
Y2
SW1
SW2
M1
Sub:
900463-08251071-24
900462-41251075-01251075-06900100-25251075-01900100-25251075-06900100-25900100-16251075-06900100-25251075-06900100-25251075-06251075-07
900022-01900020-06
9000010-01900010-20
Crystal 14.31818 MHZ 251081-01Sub:Crystal 14.31818 MHZ 251081-02Crystal 1.8432 MHZ 900555-02
Switch, Rocker C 251587-01(PC Mount)Switch, Push Button C 251260-01
RF Modulator C 251844-01Sub:RF Modulator 251311-01
FB2-14FB15-21FB22-26,FB28-38,FB40FB41-58FB59FB60FB61-63FB64-65
EM1,2
CN1
CN2
CN3
CN4
CN5-6
CN7
CN8
L1L2
L3,L3
F1
Ferrite beadFerrite bead
325563-01903025-01
Ferrite bead 325563-01
Ferrite beadFerrite beadFerrite beadFerrite beadFerrite bead
903025-01325563-01903025-01325563-01903025-01
EMI Filter 251842-01
Connector 4 PIN (power supply)C 251614-01
Connector 6 PIN DIN (serial bus)C 903361-01
Connector 7 PIN MINI DIN (cassette)C 251616-01
Connector 50 PIN Female Edge(exoab) C 251630-01Connector 8 PIN MINI DIN(joy 1 & 2) C 251259-01Connector 8 PIN DIN (audio/video)
325573-01Connector 18 PIN (keyboard)
C 251841-01
Noise FilterLine FilterSub:Sub:Coil Inductor 1.2 uHptSub:
251264-01906127-01251701-01
901152-01325570-01
Fuse 250V 1.5AFuse ClipCartridge GuideShield BoxShield Cap
903556-18906102-01310171-01C310172-01C 310173-01
C - Commodore Stock Part
6
RUN5 1 CLR CTRL) STOP,. SPACE or Q 2w ~ ... ~q;1
f-j\ 3 W ~ A SHIFT Z S E ...I. 4\!...} ,\ :17 .,"• " v
t:j"1\ 5 " R D X C F T 6 SHIFT LOCK\!y T:It -Ef tjt "' w SW
10' .L 7 Y G " V 11 B H U 8'-V ..., " " ""Q t '-V i""
-eN 1;;: M ... K of'O ~0
14RE. 17~
~2
62) ~~9 ,I jJf1\ ~-o. P m L , . : I - ~ 'fr~ 'P 'P"" 17
@ l'* ~* -EI; =\1 / ,ESC 1= j + ~ ¢
~ ,DEL RETUR~00. '" @ 1f1 1f2 f3@ 'P ~ 't' 't' ~ ~
1\
\..4 v
3 I<J
- 1 40- 2 39- - 3 38- 4 37- 5 36 -
~ 6 35 -- 7 34'- 8 33 -i- 9 32 -.- 10 31 -75011- 11 30 -,- 12 29 -- 13 28 -- 14 27 -- 15 26 -
no. 16 25 -- 17 24 -- 18 23 -
- 19 22 -,- 20 21 -
cj>OI NRDY-IRQAECVCC
AAA2A3A4A5A6A7A8A9
A1A 11A12A13GND
KEYBOARD MATRIX
RESR/WD0D1D2D3D4D5D6D7P0P1P2P3P4P5P6GATE INA15A14
A2A1A0
VDDCS0CS1R/WIRQ
MUXRASCAS
cj>0COLORCLK IN
K0K1K2K3K4K5K6K7
SYNCVSS
PIN ASSIGNMENTU2-251536-01
CUSTOM MICROPROCESSOR
HELP
- 1 48- 2 47- 3 46- 4 45- 5 44- 6 43- 7 42- 8 41- 9 40- 10 39- 11 7360 38
12 37-
- 13 36- 14 35- 15 34- 16 33- 17 32- 18 31- 19 30- 20 29- 21 28- 22 27- 23 26- 24 25
-A3-A4-A5-A6-A7-A8-A9-A10-A11-A12-A13-A14-A15-AEC-BA-SND-D7-D6-D5-D4-D3-D2-D1-D0
PIN ASSIGNMENTU1-251535-01
VLSI, TEXT DISPLAY(TED)
oS:--zz-
+en
0<
;I)z'•o•
nrA
'"
'"-.JUl.lJ
u'"
J>-iZ
."DO
'"1Tl
z•n•
IIf-
-
nL-----~_=iE• z
L------:-.J:-:1 ~I
::1d"
>1 J- N
..L-I~rNl~~
"OJ0>
vr-•...
(Jo
Zo
n FBZl no 0,... - ...o l.lJ 0D D
•
~
•
•
•
-•~
-.....o-~-
.Ih~ICJ '"'"u...,0'. '"Z z:>-o ...,......I"" '"I :li':E1
-- l.lJ
c:N
+"'<
+U1<J
-
g 1~1~152~ I~ ~;:; I", = bdc;; I<if;;: I-.J
+U1<•
;!II- I ,IJ)
»oL I h
NS
nz::Ol
,g
--n(5\ ~ '"<:'+-uJ
"N
M1 SCHEMATIC ON PAGE 11
PINCONFIGURATION
VSSCSQ)CS1RESRXC
XTL 1XTLQ)
RTSCTSTXDDTRRXDRSQ)RS1
1 282 273 264 255 24
- 6 23- 7 6551 22- 8 21- 9 20- 10 19- 11 18- 12 17- 13 16- 14 15
-R/W-Q)2-IRQ-D7-D6-D5-D4-D3-D2-D1-DQ)-DSR-DCD-VCC
U3-901895-02ACIA
TRANSMIT/RECIEVE CHARACTERISTICS
CHARACTERTISTICS SYM-02 UNIT
2 MHZMIN MAX
TRANSMIT /RECEIVE *tCCYCLOCK RATE 400 - ns
TRANSMIT /RECEIVE tCHCLOCK HIGH TIME 175 - ns
TRANSMIT/RECEIVE tCLCLOCK LOW TIME 175 - ns
XTL 1 TO TXD tooPROPAGATION DELAY- 500 ns
RTS PROPAGATION tDLYDELAY - 500 ns
IRQ PROPAGATION tlRQDELAY (CLEAR)- 500 ns
SYNERTEK ISYP6551A 12 MHZ
FE171615141312I 1IQ)
F7F6F5F4
GND
PINCONFIGURATION
- 1 28- 2 27- 3 26- 4 25- 5 24- 6 23- 7 22- 8 21- 9 20- 10 19- 11 18- 12 17- 13 16- 14 15
-VCC-18-19--11 Q)--111-112-113-114-1115-CE-FQ)-F1-F2-F3
U19-251641-02PLA
(tr, tf = 10 to 30 ns)*The Baud Rate with External Clocking is:
BAUD RATE 116 x T CCY
CS R/W 00-07
L L DATA BUSTO PORT
L H PORT TODATA BUS
H X ISOLATION
R/WPQ)P1P2P3P4P5P6P7
VSSL = LOW LEVELH = HIGH LEVELX = IRREVELANT
I MO~[
PINCONFIGURATION
- 1 20- 2 19- 3 18- 4 17- 5 6529 16- 6 15- 7 14- 8 13- 9 12- 10 11
-VDD-CS-DBQ)-DB1-DB2-DB3-DB4-DB5-DB6-DB7
6529B I 3 MHz IU5/U27-251640-03
SINGLE PORTINTERFACE
noUl r rZ 0 Co Ai s::
--oz> ....rUlr>
• r-,~~....&
~---,I-----~-,
I --I- + 1-if 1
1-- 1-- 1,-, 1
1
'II---.$Nn$N UI
- <~ I--I'~:1 .,., I
~ j 1 ~ I1 1"1 I::0____ -+_1> I
wiLfl
*Nn-<
, '"< '"~
-QJJ1S1)l::>:
'I~II1
II
-------''\IV'V I'II 'V\I\,~. 9-~
A~JJ. --.J
"I I I '1
H'~ f_~ _ _ ..I
., I I
rvn"'--eN\), ,
____-1-- __"_
r-+
'Iµ }jr--~•-n~'"
> "'~-:>-+ao< 'I~
NIllDn'"
I'l(ltIlUln-(Xl-(J1
+~
-CIl(]I
,I• n--".:r.., c +
Z.D::0<IT1Gl
'IHf-• n
,. IN I(]II~ IUJIt'lllnr ...zZOCOJ005S:
Ai-_ZZ
S:::X>0"oCr~o::Il:x>"T'I
S
-Z+-D< n
nOOrr :5::s: 0 c -"<):os::000ccC-l-l-i
"A
III r>L ;r;2 ,\ I< r~D
OJ>OJ
~
rCs::
r>or~
IIIZo-+(]I
<'11-0'I\--'
.,., n"OJ Cll(]I ~
"()JUI
."ttlex>
.,.,OJ-6>
"CD-N."CD-""C-C
C/l
~
rJ)(')':S"CD3Dl.-+_.(')
=It::to.)......o.....0')~
zzr>n
'" UJ -- -.J
0301" /olonV'LN'J NIO Nld 93.ll3SS'v']N 10 INIVi Nld LEN]
»S-,>-lJ1
n () r:>rJ '"
> ;!;!Jnlnl:rr!:D~ti ~ ~ Gil~ ~ ~ ~ ~"ii~I~
oS,o-.J-N
o-r-
~--;r»
+ ;J::~z......."OllJIDI
•'zz("'In z:
.... n'It-.-..............
-nI'--:>:r:!:Z-O:JJtIl ....c<=;:x-<NnL11n- - - - --I>U1t)\-JCO
'3WltH:J NId rp,;tlO.1.:J3NNO;) 39G3toNJ
U3, US, U19 PINOUTS ON PAGE 8
NCDINWE
RASA(JJA2A1
VCC
WE
RAS
CAS
PINCONFIGURATION
1 162 15
- 3 14- 4 13- 5 12- 6 11- 7 10- 8 9
COMMODORE APPROVED VENDOR ACCESS POWERPART SOURCE 1 PART TIME CYCLES ACTIVE STANDBY
NUMBER OF SUPPLY NUMBER (ns) (ns) (MW) (MAX)(MW)
901505-01 HITACHI HM4864-3 200 335 330 20
901505-01 NEC !-,PD4164-2 200 375 250 28
901505-01 MITSUBISHI M5K416NS-20 200 330 275 28
901505-01 MOSTEK MK4564N-20 200 345 300 22
901505-01 OKI MSM3764-20 200 330 248 23
901505-01 HITACHI HM4864P-3 200 335 330 20
901505-01 MATSUSHITA MN4164P-20 200 330 275 27.5(PANASONIC)
901505-01 SIEMENS HYB4164-3 200 330 150 20
901505-01 SHARP LH2164-Z1 200 330 248 28
901505-01 HITACHI HM4864AP-3 200 330 242 20
901505-01 TOSHIBA TMM4164AP-20 200 330 275 22
-vss-CAS-DOUT-A6-A3-A4-A5-A7
U11 - 1864K DYNAMIC RAM
901505-01
- R/W CLOCKGENERATOR R/W SWITCH
, ;
•RAS CLOCK U DATA IN
()
GENERATORw
MEMORY C MEMORY BUFFERARRAY • ARRAY....
0U
~
CAS CLOCK CI) ROW DEC. ROW DEC. CI) DATA OUTa..a.. •GENERATOR U :iE BUFFER
~ :iECI) ~ MEMORY c(
•c( MEMORY:J: ARRAY w ..i ~ ARRAY ~, CI) CI) 0 CI) W ---.0W CI) U CI) a::a:: ::J • ::J LL.A7 - - LL. ca U CIl W ---.-0W o W 0 a::
/ AGo a:: MEMORYCI) ;;;;;C ;;;;;MEMORY wCI) a:: w ~ ARRAY ~w / ARRAYw CI) VBB GENERCI) LL. ZCI) U WLL. Ww ::J CI)
CI)
a:: ROW DEC. l/l ROW DEC.caC '" ....CI) •
C Uc( \ CI) ww MEMORY C MEMORY:J: a::
ARRAY • ARRAYCI) C ....w C 0a:: c( uLL. •Wa:: " A0 v FUNCTIONAL DIAGRAM
DIN
DOUT
VCC
VSS
ATOR
NCA12
A7A6A5A4A3A2A1ACIJD1D2D3
GND
NCA12
A7A6A5A4A3A2A1ACIJD1D2D3
GND
PINCONFIGURATION
1 282 273 264 25
- 5 24- 6 23- 7 23128 22- 8 21- 9 20- 10 19- 11 18- 12 17- 13 16- 14 15
-VCC-CS3
-A13-A8-A9-A11-CS,-A1CIJ-CS2
-D8-D7-D6-D5-D4
U23-318006-01ROM - BASIC
PINCONFIGURATION
1 28- 2 27- 3 26- 4 25- 5 24- 6 23- 7 23128 22- 8 21- 9 20- 1CIJ 19- 11 18- 12 17- 13 16- 14 15
-VCC-CS3
-A13-A8-A9-A11-CS,-A1CIJ-CS2
-D8-D7-D6-D5-D4
U24-318005-04ROM - KERNAL
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C20 COMPONENT PARTS VALUE: R = n. C = F.2200r ~2S R26 p3
6.81< 6.8k· : ~():)p Q3. Q4: 2SC460 OR EQUIVALENT.Q1. Q2: 2SC1684 OR EQUIVALENT.
L f (I
COLO~ IN
LUH IN
RF oUTt8
(iRO(JND
AUDIO INL = H
03. 04: 1SS198 OR EQUIVALENT.02 : 1SS110 OR EQUIVALENT.01 : 1SS119 OR EQUIVALENT.
~u l.~r--h I
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TOP VIEW
-!1ftCH4- 4 I "CH3
NO. TERMINALS
1 N.C.
2 AUDIO SIG. INPUT
3 +B (+5V)
4 SYNC + LUM. SIG. INPUT
5 COLOR SIG. INPUT
6 COLOR SIG. OUTPUT
7 COMPO. SIG. OUTPUT
8 SYNC + LUM. SIG. OUTPUT
9 RF OUTPUT
10 CHANNEL SELECT SW.
'1
o"'--I,
RCA. PHONO JACK
D.ETAIL (CH.S'N)
,
tiLL - -
REAR VIEW
RF Modulator Layout and Schematic #2518441 1
COLOR IN
LUI1 IN
i"B
AUDIO IN
RCA. PHONO
LIe I~f QI'---~"uoo v .R4
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,~ .Roll
~~ ~oQ(~ Q2 C2~2.20f_ 'A" " ('4 CS.... _ L'2 ~22P .2201"
Df ~-- 10µY~t----:o;::,-"-+----' L UM ouTI\(~> ()..~
CJ '" Q(~ -.JJOP (\)"':. 'i) \:) "\ .' COMP OuT
tv 1.1 "> .... "\ " £!...., 1\(" 1\(,fUa. <t,7)(-../0* (/7I{,P
RId ~ RIS CI2!~ -~ CIS" elf( 1<21, sM' R.14 C8 .2.71<. ~3P:~ ,: Dj '" p 'WO' 1.20P ~8-ISO_
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RF our
L = H
Q1, Q2: 2SC1684 OR EQUIVALENT.03, 04: 1SS198 OR EQUIVALENT.02 : 1SS110 OR EQUIVALENT.01 : 1SS119 OR EQUIVALENT.
NO. TERMINALS
1 N.C.
2 AUDIO SIG. INPUT
3 +B (+5V)
4 SYNC + LUM. SIG. INPUT
5 COLOR SIG. INPUT
6 COLOR SIG. OUTPUT
7 COMPO. SIG. OUTPUT
8 SYNC + LUM. SIG. OUTPUT
9 RF OUTPUT
10 CHANNEL SELECT SW.
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CH¢ • I • CH3TOP VIEW
D.ETAIL (CN.SH)
REAR VIEW
RF Modulator Layout and Schematic #2513111 2
Issue 6, 1984 : Computer 3.. commodore
Model: PLUS 4 © 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 theboard can create problems. It is possible for them to beshorted to the shield or to each other. Make sure they areevenly spaced and do not contact the shield.
Areas of the PCB particularly vulnerable to thisproblem are:
Bottom right corner - capsBottom center - Jl-J6Bottom left - Q3 shorted to FB57Top left - ferrite beadsCenter - Twisted caps (just outside of RF can)
1) NO VIDEO - Absolutely no video on screenA) Check for 5 volts
O.K. If not: 1) Check fuse2) Check for twisted or bent caps
+ ( 5 V. short to ground)3) Check Ll
B) Check for oscillation at pin 14 of UlO.K. If not: 1) Check for good connection at
pin 14 of Ul+ 2) Check for good connection at
Rl thru R7C) Check for LUM signal at pin 23 of Ul, at pin 4 of
the modulator, at pin 8 of the modulator, at FB3and at pinl of CN7O.K. If not: 1) Check for LUM signal shorted
to ground+ 2) Check for open traces
3) Check modulatorD) Check for reset
O.K.
+E) Check for control signals:
Signal I.C. Pin Signal I.C. PinAEC Ul 35 R/W Ul 7AEC U2 4 0 Ul 12CAS Ul 11 MUX Ul 9CSI Ul 6 IRQ Ul 8CSl U20 15 RDY U2 2CSO Ul 5 BA Ul 34CSO U20 1 RAS Ul 10
PLUS 4 Troubleshooting Page 2
2) BAD VIDEO - Scrolling lines on screen - Randomblocks on screen - Blurred display
A) Check JI-J6 for shorts to ground or each otherO.K.•
B) Check reset for correct operationO.K.•
C) Check Ul for proper operationO.K. If not: 1) Check socket for good solder
• 2) Check for bad UlD) Check U2 for proper operation
O.K. If not: 1) Check socket+ 2) Check for bad U2
E) Check RAM data lines for correct amplitudeO.K. If not: 1) Check for hot surface of RAM
• 2) Jump out RAM to verifyF) Check multiplexers U9, UIO - signals at RP3
and RP4 should be similar in frequency andamplitudeO.K. If not: 1) Suspect U9 or U10
+G) Check ROM for chip select signal at p.in 22 of
U23 and U24O.K. If not: 1) Check for signal generation
• at U20H) Check that all ROM addresses are present and
correct amplitudeO.K. If not: 1) Trace problem address AO-A15
+I) Check U19, U23, U24 by replacement with known
good
3) NO POWERA) Verify voltage +5 and +9 volts
1) Check for shorts to ground2) Check switch3) Check power supply
4) BAD BASIC - Random characters on screen - Randomcolors - Power-up message is missing
A) Check Basic ROM U23B) Check B thru I above (Bad Video)
PLUS 4 Troubleshooting Page 3
5) NO COLOR or BAD COLOR
A) Check UlfrequencyO.K. If..
pin 14 for 14.31818 MHz withcounterno t : 1) Check solder joints of CTI
and adjust for correct frequency2) Check crystal, Ql and Q23) Check clock circuit for
opens or shortsfor Color Out signal.1) Swap Ul w/known good
B) CheckO.K.•
C) Check
Ul pin 13If not:
O.K.•
D) Check FB4 andis present.
modulator Ml pin 5 for Color In signaland pin 6 for Color Out signal
If not: 1) Check Ml operation
CN7 pin 6 to see if color signal
1) Check for shorts
6) NO SOUND or BAD SOUND
A) Check Ul pin 33 for SND signalO.K. If not: 1) Check socket for open circuit
• 2) Swap Ul w/known goodB) Check audio circuit for short to ground or loss of
signal.O.K. If not: 1)
•C) Check modulator Ml
1)
Check Q3 - Be sure emitter and baseare not shorted to 5 v.pin 2 for SND signalAdjust I.F. can (top right ofmodulator) for clean, loud volume
2) Ml pin 2 to ground should readapproximately 480 ohms
3) Check Ml for component failure
7) SERIAL FAILURES
A) Check FB23-26 for shorts to shield or each otherB) Check U7, U2 and CN2
PLUS 4 Troubleshooting Page 4
8) KEYBOARD FAILURES
A) CheckO.K.•
B) CheckO.K.•
C) CheckO.K.•
D) CheckO.K.•
pins on ribbon cable for good connection
for shorts - CN5, CN6, FB's, Diodes
chip select to U27 and the I.C. U27
Ul for proper operationIf not: 1) Check socket
2) Check for bad Ul
9) FAILURES IN SOFTWARE MODE - All units should be checked forproper operation, when any repairs are necessary.To Check: 1) Press 'Fl' on keyboard
2) Press 'Return' to enter Word Processing mode3) Press 'Commodore' key and 'c' key at the same
•tIme4) Type ltc' and press 'Return' to enter
Spreadsheet5) Press 'Commodore' key and 'C' key again6) Type 'tw' to return to Word Processing mode
Watch for video or loading problems, then:
A) Check jumpers at JI-J6 for correct connectionO.K ••
B) Check Ul, U2, U25, U26
Issue 7, 1984 computer 4 .,. commodore••
Model: C16, PLUS 4© 1980 COMMODORE BUSINESS MACHINES INC.
LINE DEFINITIONS
AO to A15AECATNBABRESETCl HIGH, Cl LOWC2 HIGH, C2 LOWCASCLK INCOLORCOMPCECSCSOCSlCST MTRCST RDCST SENSECST WRTCTSDBO to DB7DCDDRAMDRAM ADDDSRDTREXT AUDIOGATE INIRQKO to K7KERNLUMMUXPO to P7RASRESETRxCRxDR/WRTSSNDTEDTxD
'f 0f2
Address Bit 0 to 15Address Enable ControlAttentionBus AvailableBuffered System ResetExternal Cartridge Chip Select
II
Dynamic RAM Column Address StrobeMaster Clock (Single Phase, 14.31818 MHz)Chroma OutputComposite Chroma and LumaChip EnableChip SelectLow ROM Chip SelectHigh ROM Chip SelectCassette Motor ControlCassette ReadCassette SensorCassette WriteClear To SendData Bit 0 to 7Data Carrier DetectDynamic RAMDynamic RAM AddressData Set ReadyData Terminal ReadyExternal Audio InputR/W GATEInterupt RequestKeyboard Latch 0 to 7Kernal ROM Control LineComposite Sync and LuminenceAddress Multiplex ControlPort Bit 0 to 7Dynamic RAM Row Address StrobeSystem ResetReceive ClockReceive DataRead/Write LineRequest To SendSound LineText DisplayTransmit DataSystem Clock (Varies between 1 and 2 MHz)Artificial,2, Address Valid Rising Edge,
Data Valid Falling Edge
I[ commodoreIssue 6, 1985 : Computer 1
Model: C-64, C-16, Plus 4
SCHEMATICS FOR C-64, C-16, PLUS 4© 1980 COMMODORE BUSINESS MACHINES INC.
These computers have been affected by an EngineeringChange Order that adds 4 diodes to the serial port. Theseprotection diodes are not required as field upgrades. Theyare 1N914s and were added as a circuit improvement.
The Schematic and PCB Layout for the C-64 in theService Manual (Pages 28 and 32) include these diodes.However, the C-16 and Plus 4 Service Manuals were completedbefore the changes were made. The Schematic corrections areshown below:
47
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II11
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l'-.A/
~
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2. ROYF8223C. I , J,....., ........--II N.C-
,FB23
67'10(0
DATA FB24 5 -U:;-9 3rD5~
elK FB25 ro /5 <:9, ,
~
4
ATN FB'ZG,II/! ./ II 283
~/'C5T MTR 27
+5V 114><,3 .b' C5T RD 2(;,"....".,.R23 9,~lQ() -': ...fI}(J, :.".:0-::.::""'
R24 ~,y ~::e<:5CRiP+R2S y j
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U't' It,.,• •
C-16 SCHEMATIC
SERIAL BUSCD PINFEMALEDIN
0,12
C5T WRT
PLUS 4 SCHEMATIC
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