Hantarex Replace-
nient Xsistors
Data East MoNite
F'ball Q54 Failure
Chris Richards
Coin-Op Inc.
Webb City, Missouri
Peter Gustafson
Data East Pinball
Melrose Park, Illinois
SYMPTOM
I recently had some problems with the red color
amplifier on a Hantarex MTC 9000. The red
input was totally saturated. No problem. I whip
out my schematic, find the transistor in the amp
section, check it out.
SUBJECT
Intermittent and repeated failure of Q54 on ABC
Monday Night Football CPU boards.
PROBLEM
Sure enough, had a collector to emitter short. So
I pulled out my handy dandy NIE reference and
crossed the transistor. It crossed to a 123AP
with the package rotated 180 degrees. This also
crossed for a 2N2222, 2N3904, and a 2N4401.
Well I just happened to have some 2N4401
transistors on hand so I put one in.
Now I've got almost no red! Replace it again,
same story-. Go to my NIE dealer, get the 123AP,
same story-. Finally called Hantarex, got THEIR
transistors, put 'em in, every-thing worked. So
what is my point?
SOLUTION
If you have a Hantarex monitor, and something
blows up, git-aholt-of Hantarex and get the
factory- part. Since this sucker uses European
parts, there is no guarantee that a NTE or SK
part will flll the bill properly.
Murphy's Law #1111
SYMPTOM
Q54 fails several times for no apparent reason.
The wiring of the switches associated with Q54
including flipper end-of-stroke switches indi-
cate no cabling shorts.
PROBLEM
The outhole kicker has a short between one of
the coil wire lugs and the coil stop bracket. This
causes 32VDC to be shorted to the outhole
kicker assembly which, through its metal frame,
will put 32VDC on the switch matrix. Once on
the switch matrix it will get into the CPU and
blow Q54.
SOLUTION
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NOTE
If this problem is left unresolved, the short
between the coil stop bracket and the coil lug
can cause severe damage to the coil driver
transistor, Q46. Q46 drives both the outhole coil
and the Insert Flash lamp IL. If the transistor
shorts then the Insert Flash lamp will be on
continuously. This can result in severe playfleld
damage due to the large amount of heat that the
flash lamp will generate.
If further assistance is required, please call Pete
or Arnie at 1-800-KICKERS (1-800-542-5377).