Williams Sinistar, Instruction Manual

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TROUBLESHOOTING PROCEDURES:
DIAGNOSTIC MODE TESTS
TEST ROM BOARD LEDs
RECOGNIZE
CONDITION ROM BOARD LEDs
IDENTIFY
CHIPS VIDEO REMEDY
ROM “2” means ROM error 2-digit ROM chip
number “ROM ERROR” and ROM chip
number. (1) Turn power off.
(2) Replace suspected chip.
RAM “1” means RAM error Bank number first,
then chip number in
bank (see figure 4)
*(For RAM Error 41
or 42 See Note)
“RAM ERROR” followed by
RAM bank number and chip
number (Note: with multiple
RAM failures this display may
not appear) *
(1) Check for normal voltages on indicated
RAM chip: -5v/pin 1, +12v/pin 8, +5v/pin 9.
(2) Turn power off.
(3) Replace suspected chip.
(4) With multiple RAM failures always check
power supply. See POWER-UP TESTS.
CMOS (See
Appendix A) “3” means CMOS
RAM error - “CMOS RAM ERROR OR
WRITE PROTECT FAILURE” (1) Check pin 22 of CMOS RAM for +3.2VDC
minimum. If present, replace CMOS chip 1C. If
absent replace AA alkaline cells.
(2) With new alkaline cells, check for +3.8v DC.
If still absent, replace diodes D9 and D10.
(3) Upon power-up and re-entry into diagnostics
if CMOS error message persists, check CMOS
RAM memory protect and address decoding
circuits with a logic probe.
Tests 4 and 7 provide sequential subtests. To stop automatic cycling set switch to MANUAL-DOWN. Depress
advance in MANUAL-DOWN to step through subtests. LED indications are not made for these tests.
TEST & PROCEDURES VIDEO REMEDY OR ADJUSTMENT
Missing Check
1
2
3
4
5
6
All
2P4/lOP3 Pin 3
2P4/10P3 Pin 2
2P4/10P3 Pin 5
2P4/10P3 Pin 4
2P4/10P3 Pin 7
2P4/10P3 Pin 6
Perform
Sound Board Diagnostics
(see below)
SOUND
(Test 4)
“SOUND LINE 1”
“SOUND LINE 2”
“SOUND LINE 3”
“SOUND LINE 4”
“SOUND LINE 5”
“SOUND LINE 6”
(These appear one at a time)
NOTE: If any two sounds are the same, check for
a short between the select lines with the same
sound.
CRT indicates AUTO-UP closed and any stuck
switches
. CRT Display for Each Switch . . .
ROM BOARD INTERFACE BOARD
SWITCH TEST
(Test 5)
(1) Set switch to MANUAL-DOWN
and clear any stuck switches.
(2) CRT should indicate no
switches closed.
(3) Operate switches and check
for display of switch name.
ADVANCE
AUTO-UP
HIGH SCORE
RESET
LEFT COIN
CENTRE COIN
RIGHT COIN'
SLAM SWITCH 1- PLAYER START
2- PLAYER START
UP-DOWN A1
UP-DOWN B1
UP-DOWN C1
UP-DOWN DIRECTION 1
RIGHT-LEFT A1
RIGHT-LEFT B1
RIGHT-LEFT C1
RIGHT-LEFT DIRECTION 1
FIRE 1
SINIBOMB 1
(Refer to CABINET WIRING Diagram)
(1) COIN DOOR SWITCH STUCK: Disconnect
2P3
(2) PLAYER PANEL SWITCH STUCK:
Disconnect 3P2 or 3P3
(3) COIN DOOR SWITCH DOES NOT
OPERATE: Ground corresponding pin of 2P3.
(4) PLAYER PANEL SWITCH DOES NOT
OPERATE: Ground corresponding pin of 3P2 or
3P3
SYMPTOM REMAINS SAME . . . ROM Board or
Interface Board Faulty.
SYMPTOM CLEARS UP . . . Problem is in
switches or wiring
ADDITIONAL TESTS FOR OPTOSWITCHES:
(5) Check that +5v DC is at pin 1 or 12P1.
(6) With joystick in centre position, check for 0.7v
at base of ON transistor(s) (Q1 thru Q6) and 0.1v
at pin(s) 2, 3, 4, 6, 7 and 8 of 12P1
(7) With joystick moved from centre position,
check for 0.1v at base of OFF transistor(s) and 5v
at pin(s) 2, 3, 4, 6, 7 and 8 of 12P1
(8) With joystick in centre position, check for 5v at
pin(s) 5 and 9 of 12P1. With Joystick in Down
(Left) position, check for +5v at pin 5 (9) of 12P1.
With Joystick in Up (Right) position, check for +0v
at pin 5 (9) of 12P1.
NOTE: Two static RAMs located on the ROM board are indicated as RAM 41 in chip location 6D and RAM 42 in
chip location 4D.