Panasonic UF-5500 Service Manual page 182

UF-5500 / 4500
2. CHG, GRID
(Pin5) at a low level?
Is the abnormal detection
wave observed at the
CHG BIAS , GRID
Is CHG REM signal
YES
signal (Pin2) 0V?
YES
Does pin1 of IC1
output signal?
YES
Is about 34kHz sine
collector of Q3?
YES
Replace the unit.
Check the connection between Main
NO
Board (Pin5 of CN505) and HVPS unit
(Pin5), and check the Digital unit itself.
NO
Check if CHG is no-load
or short-circuited.
NO
Replace the IC1, and
check the peripheral parts.
NO
Replace the Q3, and check
the peripheral parts.
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