Panasonic UF-5500 Service Manual page 183

3. TRA (+)
Is CHG REM signal
(Pin5) at a low level?
(Pin3) at a low level?
detection signal (Pin2) 0V?
the collector of Q62?
TRA (+) BIAS
YES
Is TRA CLK signal
YES
Is the abnormal
YES
Does pin1 of IC1
output signal?
YES
Is about 60kHz sine
wave observed at
YES
Replace the unit.
Check the connection between Main
NO
Board (Pin5 of CN505) and HVPS unit
(Pin5), and check the Main Board itself.
NO
Check the Main Board.
NO
Check if CHG is no-load or
short-circuited.
NO
Replace the IC1, and check
the peripheral parts.
NO
Replace the Q62, and check
the peripheral parts.
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