Pacman board Problems, some things to try.
Erik Mckeone
may
be caused by their failure. Certainly this won't fix all problems but its
a good
place to start. Hope it is usefull to someone out there.
PAC - MAN
TROUBLE SHOOTING
PC A082-91375-AOOO
NOTE: All I.C. trouble shooting information is with the I.C.
removed from circuit.
POSITION CHIP POSSIBLETROUBLE
1-E 74LS1 61 All Characters are at
top of screen - Characters move
horizontally only.
1-F 74LS283 Lines and Squares
entire screen - Effects Self Test.
1-H 74LS283 Horizontal lines
across screen in color.
1-K 74LS283 No Sounds - Game plays
normal.
1-L 74LS174 Same as 1-K
1-M 5623 (Prom) Same as 1 -K
1-N CD 4066 Same as 1-K
2-A 93415 (Ram) Effects Color of all
Characters - Game plays.
2-B 93415 (Ram) Same as 2-A
2-C 93415 (Ram) Same as 2-A
2-D 93415 (Ram) Effects Color of the
Characters - Eyes only two
Characters.
2-E 74LS161 Characters top of
screen - Characters move
horizontally-Effects
Game Play-Color & Sound OK.
2-F 74LS283 Effects Self Test -
Row of Characters horizontally
acrossscreen. Effects
Game Play-Color&Sound OK.
2-H 74LS86 All Characters are
Squares - Effects Self Test -
Horizontal Color Bars
across screen.
2-K 74LS89 Effects all Sounds -
Game plays & color OK.
2-L 74LS89 Same as 2-K
2-M 74LS273 Same as 2-K
2-P 74LS02 Effects Sync - No
Video - No Sound - Moving
Diagonal Lines.
2-R 74LS161 Vertical short lines
in color - Effects Game Play.
2-S 74LS161 Horizontal Color Bars
across screen - Effects Game
Play.
POSITION CHIP POSSIBLETROUBLE
3-A 74LS1 58 No Characters in maze.
3-B 74LS1 57 No Video (Dead)
3-D 74LS75 Characters missing in maze -
Game plays without
seeing Characters.
3-E 74LS20 No Video (Dead)
3-F 74LS89 Same as 3-D
3-H 74LS89 All Characters move
jerking - Characters do not stay
in maze.
3-K 74LS158 No Sounds - Game Plays.
3-L 74LS1 57 Same as 3-K
3-M 1 M5623 Same as 3-K
3-N 74LS74 Effects Sync - Color
Diagonal Lines.
3-P 74LS1 0 No Video (Dead)
3-R 74LS1 61 No Video (Dead)
3-S 74LS1 61 Effects Sync -
Diagonal Lines.
4-A 1 M5623 (Prom) No Video (Dead)
4-B 74LS377 Distorted Letters - No
Color - Maze is White
Effects Game Play.
4-C 74LSOO No Video (Dead)
4-D 74LS273 No Maze - Screen
covered with Number Fives - No
Letters - Characters
moving about.
4-E 74LS157 Distorted Maze -
Letters Upside Down - Characters
Distorted.
4-F 74LS86 Distorted Characters -
Letters and Sound.
4-H 74LS245 Flashing White Dots -
No Color.
4-K 2114 (Ram) Al I White Zeros on
screen.
4-L 2114 (Ram) Flashing Numbers and
Letters in Color.
4-M 2114 (Ram) Blank screen with a
Single Zero at top of screen -
Two Red Characters
Only.
4-N 2114 (Ram) Same as 4-K
4-P 2114 (Ram) Flashing Self Test -
Flashes continuous.
POSITION CHIP POSSIBLETROUBLE
4-R 2114 (Ram) Screen is blank with
a Number One flashing A
single Character can
be seen.
5-A 74LS1 57 Blue Screen - All
Characters are Squares No
Letters or Numbers.
5-13 74LS1 94 Color Squares around
each Character - All maze dots
are blue.
5-C 74LS194 Effects Maze -
Characters have Squares around
them - Self Test in
Red.
5-E 9332 (Prom) Blue screen with
Horizontal Squares - No Maze - No
Letters or Numbers
random Characters.
5-F 9332 (Prom) Effects
Characters'In Maze which are Squares -
Everything else
normal.
5-L 74LS1 39 Red screen flashing
with all Letter F's.
5-M 74LS74 Screen covered with
Garbage in Color.
5-N 74LS08 Effects Sync -
Moving Diagonal Lines in Color.
5-S NVC 284 (Custom) Flashing White Dots -
Game plays.
6-B Z80 CPU Screen covered with
Garbage in Color.
6-D NVC 285 (Custom) Same as 6-B
6-E 9332-B (Prom) Flashing blue Zeros
and Garbage - Continuous
Meter Pulses.
6-F 9332-B (Prom) Blank screen with a
Flashing Number One - Bad
Rom One.
6-H 9332-B (Prom) Screen covered with
Garbage.
6-J 9332-B (Prom) Blank screen with
random Characters..
6-R 74LS367 Screen flashing with
Garbage in Color.
6-S 74LS367 Same as 6-R
7-F 7603 No Video (Dead)
7-H 74LS08 Eleven Horizontal
rows of Zeros across screen.
7-J 74LS138 No Video (Dead)
7-K 74LS138 No Video (Dead)
7-L 74LS02 Same as 7-J
7-M 74LS139 Screen covered with
Garbage in Color.
7-N 74LS42 Same as 7-J
POSITION CHIP POSSIBLETROUBLE
8-A 74LS107 No Video (Dead)
8-B 74LS368 Same as 8-A
8-C 74LS74 Ef f ects Sync - Diagonal Li
nes f lash 1 ng.
8-D 74LS367 Effects Dip Switch settings.
8-E 74LS367 No Coin - No Up & Down
Controls - 1st Player.
8-F 74LS367 No Controls - 2nd Player.
8-H 74LS367 No Test Switch - 1 & 2 Player
Select.
8-K 74LS259 Stays in Self Test - Shows
Memory OK.
9-C 74LS161 Screen covered with Garbage in
Color.
11-A LM377 - LM1877 No Sounds.
ADDITIONAL DEVICES
1 O-A Dip Switch Effects Coin Play - Number
of Pac-Man Bonus
Pac-Man.
B-7 Crystal (18.432) No Video (Dead)
P-8 (I R1) 78GVIC (Regulator) Effects +5VDC
R-9 D44VM4 Pass Transistor - Ef f ects
+ 5 VDC
L-9 D40K1 Transistor - Effects Coin
Counter
C-9 2N3391 Transistor - Ef f ects Power
Reset
Colin Kraft
>Following is a list of componets on a pacman board and some faults that
>may
>be caused by their failure. Certainly this won't fix all problems but its
>a good
>place to start. Hope it is usefull to someone out there.
> PAC - MAN
>TROUBLE SHOOTING
> PC A082-91375-AOOO
Eric,
Thanks for posting that troubleshooting info. I am sure it will come
in handy to those of us that are not engineers. If you have similar
info for other games, please feel free to post it as well.
Mowlawnman
book goes into detailed discussion about each section on the board and how
it works. These books have been offered here on the net before, I believe
MARCO (ti...@ixnetcom.com or something like that) was selling them. Highly
recomended if you want to seriously learn board repair.
David J. Holcomb
: This comes from a very good book on troubleshooting the pacman board. The
I don't know about Marco Specialties, but I am selling this manual
and a copy of a companion manual for $8 each. I think I have about
10 original copies of the part I manual left and I am going to be
making several copies of the part II manual (sans the cover, which is
missing). Part I is a higher-level troubleshooting guide, and part
II walks you through each section of the game logic.
I also have similar manuals for Galaxian. I think the Pac-Man
manuals are more detailed, though.
--Dave