SPECIAL-SOLENOID LOGIC
FOR "ON" STATE
CONTROLLED
SOLENOID "ON"
S
SYSTEM-9 MEMORY-CHIP TEST
Press the
DIAGNOSTIC button on the CPU Board. The following
Indications are provided.
0-test passed (game returns to Game-Over Mode)
1-U18 CPU-Board lockup; also check
memory-protect circuit and 018 CMOS RAM for
stuck bits
2-020 Game ROM
I
faulty
3-1.120 Game ROM
I
faulty
4-U19 Game ROM 2 faulty
5-Coin-door closed, memory-protect circuit faulty, or
U18 CMOS RAM faulty
No indicatlon-1.120 Game ROM 2 faulty
SOUND-SECTION TEST FOR SYSTEM 9
1.
PRESS THE DIAGNOSTIC BUTTON 5W2 on the CPU
Board. Several electronic sounds should be
produced. This sequence of sounds is repeated
until the game is turned OFF and back ON.
CONTROLLED-SOLENOID LOGIC
FOR "ON" STATE
IN THE SOLENOID-OFF STATE,
(1)
the PIA line goes low.
(2) Meanwhile the BLANKING signal remains high. (3)
The rest of the signals reverse their phase.
2. NO SOUND IN DIAGNOSTIC TEST (but sounds are
present in the Self Test): Check the sound-select
inputs (pins 2 through 9 of U 13) to see if they
pulse during Test 00.
3. NO SOUND: Check the -12V-supply voltage on the
CPU Board. If this voltage is low (or AC ripple
seems too high)...
A.
Check the gray and gray-green transformer
secondary wires for I8JVAC;
B.
Check the -12V filter-capacitor C7 on the
CPU Board;
C.
Check for excessive AC (over 0.75 VAC)
across C7 on the CPU Board.
4. STILL NO SOUND: Turn the volume control all the
way up. With the game turned on, momentarily
place a powered-up AC soldering-pencil on the
center rap of the volume control. DO NOT use a
soldering iron of over 40 watts. Cordless models
will NOT work here.
A. If you hear a low hum, the power-amplifier
chip (TDA2002), volume control and speaker
are okay.
IN THE SOLENOID-OFF STATE,
(1)
the switch trigger
(eg., kicker switch) goes low. (2) Meanwhile the PIA
line remains high. (3) The rest of the signals reverse
their phase. (These six solenoids aren't pulsed during
the Solenoid Test Instead, you must check them
manually: Press on theft trigger switches or pull their
switch-trigger lines low.)
B.
If you don't hear
a hum,
try the
test again
with the volume
control
turned
halfway up.
15
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