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2. General System-11 B 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
BANZAI RUN,
and the
DAC (Digital-to-Analog Converter) sound circuits are functioning properly.
'_
TEST/DIAGNOSTIC PROCEDURES
(Continued)
SYSTEM-11 B MEMORY CHIP TEST (Continued)
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 performed;
the game is locked here, until the game is turned off).
2
MEM. PROT. FAILURE This message means that (A) the Coin Door may be shut; (8) the Mem-
ory Protect Switch may be stuck in the ON position; (C) the memory
protect logic is protecting the mernoryior (D) a U25 RAM failure is
occurring. (See Note 1)
3
U51 PIA FAILURE
U51 has a malfunction.
(See Note 2)
4
U38 PIA FAILURE
U38 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
U10 PIA FAILURE
U10 has a malfunction.
(See Note 2)
9
IROFAILURE
IRO 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 may be a ROM failure, or its
associated connections and connectingdevices are causing it to ap-
pear to have a problem. (The following U2S test is skipped.)
11
U2S ROM FAILURE U2S's intemal 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-11 B SOUND CIRCUITRY TESTS.
Tests of the System-11B Sound circuitry, including the Audio Board are possible, only after suc-
cessful completion of the System-11B 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; 5 sounds
=
U20 problem.
If no sound is heard, refer to the text entitled "NO SOUND ...". If
one.
"ring" is heard, this
indicates a malfunction of the U23 RAM Chip. If either
MQ
or
tcur
"rings" is heard, this indicates a
problem associated with the U21 ROM Chip. If either.tb.m.e.or ~ "rings" is heard, this indicates
a problem with the U22 ROM Chip.
NO SOUND DURING THIS TEST(but
sound can be heard during the Diagnostic Tests).
Check the sound-select inputs (pins 2 through 9 of U9) to see if they pulse during Sound Test
01. Also, check the -12 V supply voltage on the CPU Board. If this voltage is low (or AC ripple
seems too high). perform the following checks:
1. The gray and gray-green transformer secondary wires for 19.4 VAC.
2. The CPU Board filter capacitor 'C26 for -12 VDC.
3. The filter capacitor C26 for excessive AC ripple (over 0.75VAC).