American
Arcade
Technical
Academy
(Formerly American Arcade School)
* In
depth instructions
on solid state game
equipment.
Guest lecturers from
major game factories. Con-
c i se 6 day course, includ-
ing text books am technical
manuals.
Lecture sessions and
in shop training directed
by Don Wright, formerly
Chief Technician at Cine-
matronics.
Limited space available.
Sessions will be held on
the second and fourth
Mondays of every month
through the following
Saturdays.
*
*
*
4607 Mission Gorge Place
San Diego, CA 92120
CALL NOW
for information
In California
(714) 287-4263
Nationwide
1-800-854-2521
Credit Cards Accepted
American
Arcade
Technical
Academy
SHJ OCTOBER 1981 4
EXIDY
"Venture" Audio Diagnostic Test
The following code is only an indication of where to first check the Audio Board. Because
this diagnostic test only evaluates certain components, other circuitry is relied upon for the
test. Should this other circuitry fail, the diagnostic test may not, then, point directly to
the failure. Please use the results of this test as a guideline for further troubleshooting.
The code is as follows:
0 beep: If no beeps are heard, along with a hum or random notes, this may indicate a
failure in 3A and/ or 7 A.
I beep: All audio hardware is OK. However, be sure to check the Attract Mode Cycle
anyway for a possible message to check the Audio Board. In occasional
instances, this can occur. The message will further direct you.
2 beeps: ZERO PAGE RAM failure. Check 65 32 RAM 1.0. Timer Array at location 7B
on the board.
3 beeps: (will not occur)
4 beeps: ROM failure
5 beeps: INTERRUPT FAILURE. Check 6532 at location 7B.
In addition, this message appears during the Attract Mode only if the Audio Board needs to
be checked:
"CHECK AUDIO BOARD"
xx
yy
XX and YY in the message are code characters defined as follows:
XX= 01 = ZERO PAGE RAM FAILURE, check 6532
02 = (will not occur)
n3 = ROM FAILURE. Any number in the XX position ending with a 3 (for
example, 23, 33, etc.) indicates a ROM failure. The first digit (2 and 3 in
the previous example) points you to the appropriate chip that needs to be
checked. The code for any number ending with 3 in the XX position is as
follows:
XX = Chip to Check
03
3A
13
4A
23
5A
33
6A
43
7A
Note: The message reflects the first bad chip it encounters, in numeric
order. It is possible for chips following it to also be bad.
04 = INTERRUPT FAILURE, check 6532.
?? = FAULTY COMMUNICATIONS. Check 6520 at 9B.
Here is the code for the second two numbers in the YY position.
YY
= 40 =
Communication from Logic Board to Audio failed. Check 6520, both
locations 8B and 9B.
80 = Communication to Logic Board from Audio failed. Check 6520, at
locations 9B and especially 8B.
<0 = Communication between Logic and Audio failed. Check 6520, both
locations 8B and 9B.
Also, the symbol <0 in both the XX and YY position, along with a hum or random notes
and no beep after power on, may indicate a failure in 3A and/or 7A.
Reprinted Courtest of Exidy's "Zero Downtime" Technical Newsletter.