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TEST/DIAGNOSTIC PROCEDURES (Continued)
SYSTEM 11C MEMORY CHIP TEST.
A new feature is now included in the Memory Chip Test for System 11C. During power-up, the CPU performs
a self-testing routine. When all tests are satisfactory, the game proceeds to the Attract Mode, allowing players
to use the game. Whenever a portion of the testing does not produce satisfactory results, the game displays
a message, before proceeding to the next portion of the testing. ONLY after all tests are satisfactory does the
game allow play to begin.
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In addition to the displayed message, when any part of the seH-test routine fails, LED2 ('DIAGNOSTIC'),
mounted on the CPU Board, can be observed to determine the probable cause of the problem. This LED blinks,
or flashes, a certain number of times to identify the probable cause, as described in the CPU LED Indicator
Codes Table. The operator can also start the seH-test routine by pressing the CPU Diagnostic Switch (SW
2)
on the edge of the CPU Board.
CPU LED Indicator Codes Table
Diagnostic LED
'_
U25 RAM FAILURE
Explanation
Notes:
1. This test assumes that the Coin Door is OPEN; it is initiated ONLY by pressing the CPU
Diagnostic Switch (SW2).
2. Alternatively, its associated connections or connecting devices are causing the IC to appea
to have problems.
U25 RAM could not be used properly (NO other tests are performed
the game is locked here, until the game is turned Off).
MEM. PROT. FAILURE This message means that (A) the Coin Door may be shut;
(B)
the
Memory Protect Switch may be stuck in the ON position; (C) the
memory protect logic is protecting the memory; or (D) a U25 RAM
failure is occurring. (See Note 1)
U51 has a malfunction. (See Note 2)
U38 has a malfunction. (See Note 2)
U41 has a malfunction. (See Note 2)
U42 has a malfunction. (See Note 2)
U54 has a malfunction. (See Note 2)
U10 has a malfunction. (See Note 2)
IRQ has a malfunction. It may be missing or too fast or too slow.
U27's internal checksums do not match. It may be a ROM failure,
0
its associated connections and connectingdevices are causing it to
appear to have a problem. (The following U26 test is skipped.)
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U26 ROM FAILURE .U26's internal checksums do not match.
CPU Problem
U51 PIA FAILURE
U38 PIA FAILURE
U41 PIA FAILURE
U42 PIA FAILURE
U54 PIA FAILURE
U10 PIA FAILURE
IRQ FAILURE
U27 ROM FAILURE
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