Sony KV-27EXR25, Technical Service Data

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TROUBLESHOOTING
continued
If the wave form is missing at the emitter of
Check the voltages, waveforms, and components associated
with 42244, pins 3 thru 6 of IC2 104, and pin 3 1 of
If the waveform is at pin 4 of
Check the voltages, and components associated
with Y Buffer Transistor (42202).
PIP CHROMA
Check for the waveforms at pins 20 and 22 IC
If the waveforms are missing:
Check the voltages, waveforms, and components associated
with pins 16 thru 22, and 31 of IC2 103.
Check the oscillator at pins 15 and 18 of
Check the voltages and components associated with Sub Color
Control and pin 13 of
Check the voltages and components associated with Sub Hue
Control and pin 12 of
If waveform is present at pins 20 and 22 of check
for the proper waveforms at pins 17 and 18 of A/D Conv IC
If the waveforms are missing at pins 17 and 18 of
Check the voltages, waveforms, and components associated
with R-Y Out Transistor
and B-Y Out Transistor
(42114).
If the waveforms are present at 17 and 18 of check for
the proper waveforms at pins 4 of R-Y D/A Conv IC and
B-Y D/A Conv IC
If the waveforms missing at pin 4 of and
Check the voltages, and components associated
with PINP Conv IC and
If the waveforms are present at pin 4 of and
Check the voltages, waveforms, and components associated
with R-Y Buffer Transistor
B-Y Buffer Transistor
Red Drive Transistor Blue Drive Transistor
and Green Drive Transistor (42109).
SET Page 1