Star Tech Journal

STAR*TECH Joumol
0
ATARI. STUN RUNNER
STEERING PROBLEM
July 1993
POOR QUALITY~.
COIN SWITCHES
Mike Cowen
Greater Southern Dist.
Atlanta, Georgia
Rick Davies
Palisades Amusements
Las Vegas, Nevada
SUBJECT
SUBJECT
Atari Stun Runner steering
problem.
CPU board under the piggy-
back board. The chip is sock-
eted for easy replacement.
SYMPTOM
Cannot steer side to side in
game mode. Steering checks
OK in test mode.
PROBLEM
The battery-backed RAM at
location 210E has failed. This
RAM holds calibration data
for the steering circuit while
the game is off.
SOLUTION
Replace the failed RAM. It is
located at the far comer of the
SUBSTITUTES
In regards to Bill Johnston's
article about coin switches in
the May 1993 STAR'ff'TECH
Journal issue "Testing Coin
Door Switches".
Acceptable replacements are:
FINDINGS
• ST (SGS-Thomson)
MK48Z02B-15
or
• Dallas DS1220.
NOTE
The game will calibrate itself
on power-up. Make sure you do
not hold the controls during
calibration.
I am certain the blue coin
switches used on Coin Con-
trols doors are the main cul-
prits. Having changed at least
100 of them myself, I've found
that these switches are oflo~
quality and are sometimes baa-,.·
right out of the bag. I've seen
220 ohms across a brand new
switch!
TESTING
Check the new ones before you
install them. I al ways click
them at least five times to
verify their operation.
Don't Let Those Time & Money Saving
Mod's, Fixes & Technical Tips
Gather Dust In Your SeNice Files ...
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It's really strange, sometimes
they read perfectly good then
several clicks later you'll get a
bad reading. If anyone makes
a higher quality replacement,
I for one sure would be inter-
ested.