Tandy 26-3334 Service Manual page 59

NTSC
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Measure
Voltage
at Collector
of
Q1
WJt^ icope
determine
frequency
of
AC
Component
HepPace fCS
Replace Q1
Check
AC
Voltage
at
anodes
of
D1 and
D2
w
Check Vtc PIN
of ^ach IC to
determine
if
IC
a k c essi
vsl
y
noisy-
use scope
Replace despike
capacitor ^or
that
chip
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