H
Atari Centipede
Distorted Audio
\STAR*1ECHJoumal
s
Beckman
A
DM25XL
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RandyTeny
Alpine Amusement
Connersville. Indiana
E
SYMPTOM
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Multimeter
EASY
ro UsE,
LARGE DISPLAY, Low Cosr!
■
Distorted Audio ( especially after the first screen).
• 29
20
• BUILT-IN
SYMPTOM
At first. I would adjust RB (1 Kohm potentiom-
eter) but after a few more months on location, the
same thing would occur so I investigated further.
RANGES
MHZ LOGIC PROBE
20 MFD
MEASUREMENT To 2000
• CAPACITANCE MEASUREMENT To
• RESISTANCE
MEGOHM•
1 O AMP
RANGE Ac AND
De
• TRANSISTOR GAIN MEASUREMENT
CAUSE
Asit turned out R6 (2.9 kohm, l/4w) and R7 (7.5
kohm, 1 / 4w) on the regulator audio II PCB (AO-
35435) were baked off value.
SOLUTION
Replace R6 and R7 with exact replacements at
1/2 w (5% tolerance).
$89
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