Williams Sinistar, Instruction Manual

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14
INTRODUCTION
Certain types of game malfunctions may inhibit the game's
diagnostic or display faculties. Troubleshooting procedures for
most of these types of malfunctions as well as malfunctions that
permit self-diagnosis are covered below. Our troubleshooting
algorithm begins with
Power-Up
and continues until
Game Over
Mode . All procedures can be performed with minimal test
equipment or merely by observing the game itself.
POWER-UP TESTS
NO GENERAL
ILLUMINATION NO INITIAL VIDEO
(RUG PATTERN) CHECKING POWER
SUPPLY BOARD
(1) Check fuse F2 on power supply board.
(2) Check for proper installation of jumpers
W1, W2, W3 and/or resistor R27. (Some
machines DO NOT have an R27. Refer to
your drawing set.)
(3) Check 4P1/J I, 4P3/J3, 6P2/J2 and
6P3/J3.
(4) If all the above don't turn up the problem
check power supply board.
(1) Press reset button on CPU Board.
(2) Try RAM and ROM tests (see below)
(3) If all the above don't turn up the problem,
check power supply board.
(1) Swap power supply board with one from
known-good game.
(2) If game plays, problem is on power
supply board.
(3) If game doesn't play, check power
transformer with voltmeter.
(4) If known-good power supply is
unavailable for tests above, check +5V, –
5V and + 12V outputs on power supply in
game. Each MUST BE within 2% of rated
output with less than 0.1% AC hum.
MORE POWER-UP TESTS
TEST ROM BOARD
LEDs RECOGNIZE
CONDITION ROM BOARD LEDs
IDENTIFY BAD
CHIPS
VIDEO REMEDY
GENERAL “0” means all
power-up tests
passed - (1) Scanning rug pattern
(2) Stationary rug pattern
(3) "INITIAL TESTS INDICATE ALL
SYSTEMS GO"
(4) Game-Over Mode
If any video (see left) is missing or
error message is displayed,
proceed to
Diagnostic Mode
tests.
“0” means tests
passed - “HIGH SCORE TABLE RESET”
“BOOKKEEPING TOTALS CLEARED”
“ADJUSTMENT FAILURE”
“RESTORE FACTORY SEITINGS
BY OPENING FRONT AND
TURNING GAME OFF AND ON”
(1) Open coin door and turn
power off and on. CMOS (See
Appendix A)
“0” means tests
passed - “FACTORY SEITINGS RESTORED” (2) Press ADVANCE. Game
should return to Game-Over
Mode.
BATTERY (See
Appendix A) “0” means tests
passed - “HIGH SCORE TABLE RESET”
“BOOKKEEPING TOTALS CLEARED”
“ADJUSTMENT FAILURE”
“RESTORE FACTORY SEITINGS
BY OPENING FRONT AND
TURNING GAME OFF AND ON”
(1) Open coin door and turn
power off and on. Or press
ADVANCE. In either case, game
should return to Game-Over
Mode.
(2) Check AA alkaline cells on
CPU Board.
(3) If problem persists proceed
with CMOS RAM test by putting
the game into its
Diagnostic
Mode
(see SELF-
DIAGNOSTICS).
MEMORY
PROTECT
INTERLOCK
(See
Appendix A)
“0” means tests
passed - “HIGH SCORE TABLE RESET”
“BOOKKEEPING TOTALS CLEARED”
“ADJUSTMENT FAILURE”
“RESTORE FACTORY SEITINGS
BY OPENING FRONT AND
TURNING GAME OFF AND ON”
(1) Making and breaking coin
door interlock switch, check with
VOM and replace if faulty.
(2) Replace if faulty: Memory
protect gates 6E, IC1, Ql, or
CMOS RAM 1C.
SPECIAL CHIP “0” means tests
passed - (1) Scanning rug pattern.
(2) Blank screen instead of “INITIAL
TESTS INDICATE: OPERATIONAL”
(3) High score table with no scores.
(4) Intro blank or program crash.
(1) Turn power off.
(2) To find bad chip replace 2
special chips one at a time with
known good chips.
(3) Turn Machine on after each
replacement and run through
Power-Up Tests.