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3. HOLD DOWN EACH SWITCH so its number is shown at least twice. A sound is
produced and a switch number is momentarily indicated in the BALL-IN-PLAY
display. If two switches in a row are indicated with only one switch closed,
check for a short between the column wires. For multiple indications check
the column wire for a short to ground. If two switches in a column are
indicated with only one switch closed, check for a short between row wires.
4. To determine whether the problem is in the playfield or the Driver Board,
remove connectors 2P2 and 2P3 from the upper right corner of the Driver Board
and use a jumper wire to simulate operation of the switch.
Auto-Cycle Mode
1. The Auto-Cycle Mode permits you to check intermittent problems in the
playfield, backbox, cabinet and driver board.
2. Set function 50 of Test 04 (Bookkeeping Mode) to 15.
3. Press ADVANCE to start the Auto-Cycle Mode. This mode repeatedly sequences
through the Display Test, Sound Test (00), Lamp Test (01), and Solenoid test
(02).
4. This sequence is repeated until the game is turned off and on.
CPU-Board Self-Test
Press the DIAGNOSTIC button on the left side of the CPU Board. The following
indications are provided.
O-test passed (game returns to Game-Over Mode)
l-IC13 RAM faulty
2-IC16 RAM faulty
3-IC17 ROM 2 faulty
4-IC17 ROM 2 faulty
5-IC20 ROM 1 faulty
6-IC14 Game ROM 1 faulty
7-IC26 Game ROM 0 faulty
8-IC19 CMOS RAM, memory-protect circuit faulty or CPU-Board lockup
9-Coin-door closed, memory-protect circuit faulty, or IC19 CMOS RAM faulty.
Note that "0" remaining after power turn-on indicates CPU-Board lockup.
Sound-Board Self-Test
1. PRESS THE DIAGNOSTIC BUTTON at the top of the Sound Board. Several electronic
sounds should be produced. This sequence of sounds is repeated until the game
is turned OFF and back ON.
2. NO SOUND IN DIAGNOSTIC TEST (but sounds are present in the Self-Test): Check
the sound-select inputs (connector 10J3 and adjacent circuitry) or replace the
Sound Board and rerun the Diagnostic Test (see SOUND TEST above).
3. NEW SOUND-BOARD, SAME SYMPTOM: Check the cables to the CPU Board. If they're
good, replace the CPU Board and rerun the Diagnostic Test.
4. NO SOUND: Check +12V, -12V and +5V-supply voltages on the Sound Board. If
voltages are low (or AC ripple seems too high), replace C27 and C26.