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TEST/DIAGNOSTIC PROCEDURES (Continued)
SYSTEM-11A MEMORY CHIP TEST.
A new feature
is
now included
in
the Memory Chip Test for System 11A. During power-up, the
CPU performs
a
self-testing routine. When all tests are satisfactory, the game proceeds to the
Ai:
tract Mode, allowing players
to
use the game. Wheneve r 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.
In addition to the displayed message, when a test fails, the lower LED mounted on the CPU Board
can be observed to determine the probable cause of the problem. The
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 self-testing routine by pressing the CPU Diagnos-
tic Switch (SW 2) on the edge 01 the CPU Board.
CPU LED Indicator
codes
Table
Diagnostic LED
Blinksl
Display Message
Explanation
Flashes
1
U25 RAM FAILURE U25 RAM could not be used properly (NO other tests are per1ormed;
the game is locked here, until the game is turned
011).
2
MEM. PROT. FAILURE This message means thaI (A) the Coin Door may be shut; (8) the Mern-
ory Protect Switch may be stuck in the ON posi1ion; (C) the memory
protect logic is protecting the memory; or (D) a U25 RAM failure is
occurring. (See Note 1)
3
U51 PIA FAILURE U51 has a malfunction. (See Note 2)
4
U3B PIA FAILURE U3B has a malfunction. (See Note 2)
5
U41 PIA FAILURE U41 has a malfunction. (See Note 2)
6
U42 PIA FAILURE U42 has a malfunction. (See Note 2)
7
U54 PIA FAILURE U54 has a malfunction. (See Note 2)
8
u:
0 PIA FAILURE U10 has a malfunction. (See Note 2)
9
IRQ FAILURE
IRQ has a malfunction. It may be missing or too fast or too slow.
10
U27 ROM FAILURE U27's internal checksums do not match. It maybe a ROM failure, or its
associated connections and connectingdevices are causing it to ap-
pearto have a problem. (The following U26 test is skipped.)
11
U26 ROM FAILURE U26's internal checksums do not match.
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 ap-
pear to have problems.
SYSTEM-11A SOUND CIRCUITRY TESTS.
Tests of the System-11 A Sound circuitry, including the Audio Board are possible, only after suc-
cessful completion of the System-11 A Memory Chip Test.
1. Sound/Speech Board Test. A brief check of the Audio Board (0-11581) circuitry occurs at
game Turn-on; the game reports the test results
by
brief sounds,
as follows:
No sound
=
Sound! Speech Board is not operating, or a failure is affecting the sound circuitry (broken cable;
dead amplifier; etc.); 1 sound
»
system OK; 2 sounds
=
RAM problem; 3 sounds = U4 problem;
4
sounds
=
U19 problem.
2.
General
System-11 A
Sound Test.
Press the Sound Diagnostic Switch (SW 1) on left
edge of the CPU Board. Listen for the two test sounds, showing that both the CVSD (Continu-
ously Variable Slope Delta) Modulator, which provides the voices for
BIG GUNS,
and the DAC
(Digital-la-Analog Converter) sound circuits are functioning properly.
BIG GUNS
32