Basic HTML Version
•
•
•
•
•
•
•
CPU LED IndIcator
Codes Table
Diagnostic
LE D
Bllnk sl
Dis play M es sage
E xplanation
Fl a s h es
1
U25 R AM F AILU RE U25 RAM could n ot be u50 d p ro perly (NO ot hor tes ts are p erto rmed ;
the gamo Is lo c ked he re , un t ll ih e ga m e is turned o ff) .
2
M EM . P ROT . F A IL U RE T his massage m ean s that (A ) the C oin Do or
m ay
b e shut ; (B) the M em·
ory P ro tect Sw itch
may
be s tu c k in the ON p os it io n . :(C) the me m or y
protect logic Is p ro tect in g the memory ;o r (0) a U25 R AM fa i lur e is
o ccu r r ing . (Seo Note 1 )
3
U5 1 P IA F A IL U RE
U51 has a mallunction . (Sao N o to 2)
4
U3 8 PIA F A IL UR E
U 3 8 has a malfunct io n . (See N o te 2 )
5
U 41 PI A F AI LU RE
U41 has a ma lfunction . (See N o t .e2)
6
U 42 P IA F AI LURE
U42 h as a mal function . (See Note .2 )
7
U 5 4 PI A F AILUR E
U54 has a mal funct ion . (See Note
2)
8
U 1 0 P IA F AI LUR E
U10 has a malfu n ct ion . (Saa N o ta 2 )
9
IR Q F AI LU RE
IRQ has a mall u nction. II
m ay
be mi ssing or to o fas t or
100
sto w .
10
U 27 ROM F AILUR E
U27 '8
Inte rnal checksu m s do not m a tch. II m a y b e a R OM fai lu re. o r its
assoc iated connect ion s a n d con nact lngdev ic e sar e caus in g I I to ap -
pea r
10
have a pro bl em . (Th e follow ing U26 lest is s k ippe d.)
11
U 2 6 R OM F AI LUR E U26's Inlerna l che c ks um s do not match .
Not es:
1 .
Th is tes t ass umes thai the Coin Door is O PE N ;
it
is ini t ia te d O NL Y
b y
press in g the
CPU
Dia gn os t ic Sw itch (SW2).
2 .
A lte m eti ve fy,
it s associated connections or conn e cting d e vi ce s are causi n g th e
Ie
to ap -
pea r to h av e _ probl ems .
SYSTEM~11B SOUND CIRCUITRY TESTS.
Tests of the System~11 B Sound circuitry, including the Audio Board, are possible only after
successful completion of the System-11
B
Memory Chip Test.
1. Audio Board Test.
A brief check of the Audio Board (D-11581) Circuitry occurs at game Tum-
an; the game reports the test rasuns by brief sounds, as follows:
No sound
=
Audio Board is
not operating, or a failure is affecting the sound circuitry (broken cable; dead amplifier; etc.):
1
~
'" system
OK; 2
sounds",
RAM problem;
3
sounds'" U4 problem;
4
sounds",
U19
problem.
2. General
svstem-t
t B Sound Test.
Press the Sound Diagnostic Switch (SW 1) on left
edge of the CPU Board .. Uslen for the two test sounds, showing that both the CVSD (Continuo
ously Variable Slope Delta) Modulator, which provides
the
voices for
POLICE FORC E,
and
the DAC (Digital-Io-Analog Converter) sound circuits are functioning properly.
If
no sound is heard, refer to the text entitled
"NO SOUND ...".
If!l.l:W. "ring" is heard, this
indicates a malfunction of the U23
RAM
Chip.
If
either
two.
or
1Q..u.r
"rings" is heard, this indicates a
problem associated with the U21 ROM Chip. If either.lb.re..e.or.liY:e:"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) 10 see
if
they pulse during Sound Test
01.
Also, check the -12
V
supply vonage 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
A
VAC.
2. The CPU Board filtercapadtor C26 for -12 VDC.
3. The filter capacitor C26 fo r excessive AC ripple (over 0.75 VAC).