Tempest
TM
Figure
6
Self-Test Procedure Part 2
Instruction
Test Passes
Test Fails
1.
Set
self-test
switch to on (see
Figure
5).
Press RE-
SET on the
PCB,
or
turn
power off and
on
again.
After about 5 sec-
onds, the
monitor dis-
plays the
picture be-
low.
No sounds are
produced.
AUDIO
1
IS
BAD
RAM FAILURE is indicated
by a
sequence of 1
to
12
tones and an R displayed in
top
half of screen.
You
will hear
a
short low tone and
see a
short flash
on the LED start
pushbutton for each good RAM chip, and a long high
tone accompanied by
a
long
pulse on the start pushbutton for
a
failing RAM chip. The
test stops with the first fail-
ing
RAM. To restart the sequence, press RESET
on the PCB, or power
game to off,
then to
on again. Identify the bad RAM chip with the table
below. Example: four short
low tones
followed
by a
long high tone indicates
failure of RAM
at
location M3.
ENTIRE WHITE FRAME
VISIBLE AND WITHIN
V2-INCH OF MONITOR EDGE
Bad RAM Chip Location
SWITCH
AT N13
(Coin Modes)
START 2
aaoomo
1
a
SWITCH AT LI
2
(Game Play)
SWITCH AT D/E2
(Game Difficulty)
CONTROL
KNOB
Long High Tone on Analog Vecti
1st
R2
2nd P2
3rd R4
4th P4
5th
M3
6th
M4
7th L3
8th L4
9th K3
10th
K4
11th
J3
12th J4
RIGHT
COIN MECH
"CENTER COIN MECH
'LEFT
COIN
MECH
ROM
FAILURE is indicated
by a
vertical pair of hexadecimal numbers on the
top
of the
screen. The
top
number indicates the location of the failing ROM(s). Ignore the bottom
hexadecimal
number in the
pair. Identify the
bad
ROM with the table immediately
below.
SLAM
SWITCH
Displayed No.
B
A
9
8
7
6
5
4
3
2
1
0
Bad ROM
Chip
Location
R1
PI
M/N1
L/M1
K1
J1
HI
FI
El
D1
R3
N/P3*
PCB Location
Analog Vector-
Generator PCB
EAROM, Audio and
Math Box Failure are indicated by a
single
letter in the center
of
the
display. Identify the
failure with the table below.
Displayed Letter
Failure PCB Location
E
EAROM C3
(Aux.
PCB)
P
Audio 1 B/C2 (Aux. PCB)
Q
Audio 2 C/D2
(Aux. PCB)
R
M
RAM
Math
Box
* *
See
Ram
test above
*
If this ROM is bad, you
will hear a continuous low
tone, and the program may
be
un-
able to
display a screen
image.
**
Math-box failure is
explained in TM-195, Tempest Troubleshooting Guide.
[Self-test
is
continued
on next
page]
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