Star Tech Journal

Issue: 1990-December - Vol 12 Issue 10

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Nintendo R-Type Audio ProbleID
Scott E. Serpa
Arcade Services, Inc.
Albany, Oregon
PROBLEM
Recently we had an R-Type experience an audio
problem. No audio at lower volume and full
volume would produce only distortion.
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R305
270K
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...
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SYMPTOMS
...
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A quick check with a signal tracer showed good
audio coming out of the game PCB, leaving the
amplifier in the monitor as suspect.
The voltage on the collectors of transistors Q302
and Q304 and the base of Q303 and Q304 were
over double their specific voltage.
IP'IAklll:
-f
1'1111
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flU,t
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1
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.-------
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,
All the transistors tested good but this high
voltage reading indicated they were not con-
ducting.
SOLUTION
The culprit turned out to be resistor R305 a 2 70K
resistor located in between the heat sinks of
Q303 and Q304.
This resistor was open but not discolored in any
way.
m• .,.,v
1111•1
.. .
id)
( _ _ _ _ _ _ _
December
1990
STAR*TECH
Journal
_ _ ___,;,...., _
_ _ ......;.._ _ _ _ --41 __ ,__ _ _ _ _ ____;__
____
_ _ _ _ _ ______, )
MONITOR SERVICE MANUAL
BEST OF STAR*TECH JOURNAL: MONITORS
Ten years of video monitor seivice tips and symptom/
solutions! From 1979 to 1989. 100' s of time..,..aving
tips.This manual belongs on every service bench.
For a limited time, STAR*TECH Journal is offering
48 % off the price of our back volumes. Choose Volumes
1, 2, 3, 4, 10 or 11; build your own library of technical
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The Best Of .
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MONITORS
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