Panasonic VL-SV74BX Service Manual page 29

9.2.3.2 Defect of the Main board unit
Detect of the Main unit power supply
Is the voltage of
C903 about 22V?
YES
Is the voltage of C904
(Main Board) about
12V?
YES
Is the voltage of C906
(Main Board) about
12V?
YES
Is the voltage
of CL910(Main Board) about
5V? (12V→5V)
YES
(To next page)
Check around Q31,
NO
D31,R32,R31 and
C34 of Main Board.
NO
Replace fuse(F900) on Main Board of
the Main Monitor Station.
NO
Replace Resistor(R902) on Main Board
of the Main Monitor Station.
Check around IC910,
L910,R912,R913,
NO
C910,C912,C913,C914,
C915 and C917 of
Main Board.
Replace the
Is the unit powered
fault parts.
Is the unit powered
Is the unit powered
Replace the
Is the unit powered
fault parts.
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YES
END
ON ?
NO
YES
END
ON ?
NO
YES
END
ON ?
NO
YES
END
ON ?
NO