Tandy 26-3334 Service Manual page 63

Measure
VoFtage
at
Collector
erf
Q1
With scope
detflrmina
frequency
ot
AC
Component
Replace ICQ
Replace Q1
Ft
ec heck
Chack
Ac
Voltage
at
anodes
of
D1 and D2
\J
Replace
C29
Ctieck
Vcc
PIN
Of
each |C to
determine
i"f
IC
noisy-
MSB scope,
Reptace
despike
capacitor
f or
thai
chip
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