Asteroids
Figure 6 Self-Test Procedure
IN S TR U C TIO N
RES ULTS IF T E S T
PASSES
R ES ULTS IF T E S T FA ILS
1.
Set self-test
sw itch to
on
posi
tion (see Figure 5).
T V monitor displays
picture as shown in
Figure 7.
RAM FAILURE
is indicated by a sequence of from 1 to 6 tones. A low-frequency
tone is heard for each good RAM chip. A much lower frequency is heard for a
failing RAM chip. The sequence stops with the last failing RAM chip. To restart
the sequence, press the Reset pushbutton on the game PCB or set the self-test
switch to
off,
then again to the
on
position. Identify the bad RAM chip with table
below. Example: Three tones, then a tone of much lower frequency indicates
failure of RAM chip R4.
T O N E #
RAM C H IP LO C A TIO N
D2
E2
M4
R4
N4
P4
ROM/PROM FAILURE
is indicated by tw o colum ns or lines of numbers in the
upper left-hand corner of the display. The num ber in the left colum n or first line
indicates the failing ROM/PROM chip(s). Identify the bad ROM/PROM with table
below.
The number in the right colum n or second line indicates the failing data bit of
the failing ROM/PROM. Identify the bad bit with the second table below. If more
than one bit is failing, the displayed number(s) are hexadecim al com binations
of the numbers show n below. Exam ples:
1) If bits D2 and D3 fail, C is displayed.
2) If bits D2, D3 and D7 fail, 8C is displayed.
3) If bits D4 and D5 fail, 30 is displayed.
4) If bits D1, D3, D5 and D6 fail, 6A is displayed
DISPLAYED NO.
FA ILIN G ROM/PROM
0
1
N/P3
K4, L4
2
3
F1
F2, L1
F2, H1
L2, L1
4
5
D/E1
H2, J1
H2, J1
M2, M1
6
7
C1
K1, J2
J2, K1
N2, N1
DISPLAYED NO.
FA ILIN G BIT
1
DO
2
D1
4
D2
8
D3
10
D4
20
D5
40
D6
80
D7
RAMSEL SIG NAL FAILURE
is indicated by a B A N K ER R O R or P A G E S E L E C T
ER R O R m essage at lower m iddle of display.
2.
A ctivate all
control panel and
coin d oor sw itches.
W hen satisfied with
test, set self-test
sw itch to
off
posi
tion.
1 PLAYER STA R T
and 2 PLAYER
S TA R T LEDs are
lighted. High-
pitched click for
each activated
switch.
1 PLAYER S TA R T and/or 2 PLAYER S TA R T LED s not lighted.
High-pitched click sound is not heard for any particular switch.
6
