Hitachi DV-PF73U Service Manual page 21

FLOW CHART NO.6
P-ON+5V is not outputted. (P-ON+9V is outputted normally.)
Is 5V voltage supplied to the collector of Q056?
Is the "H" pulse inputted into the base of Q056?
Replace Q056.
FLOW CHART NO.7
EV+3.3V is not outputted. (P-ON+5V is outputted normally.)
Is 5V voltage supplied to Pin(1) of IC1004?
Replace IC1004.
FLOW CHART NO.8
P-ON+12V is not outputted.
Is 12V voltage supplied to the emitter of Q1006?
Is the "L" pulse (approximately 0V) outputted to
the collector of Q1005?
Replace Q1006.
FLOW CHART NO.9
P-ON+3.3V is not outputted. (EV+3.3V is outputted normally.)
Is the "H" pulse (approximately 5V) inputted into
the base of Q1011?
Replace Q1011.
FLOW CHART NO.10
EV 1.5V is not outputted.
Is approximately 2.35V voltage supplied to Pin(1)
of IC1002?
Replace IC1002.
3-2
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No Check D016, D018, C020, C021, and their
periphery, and service it if defective.
No
Check Q056, R057 and their periphery, and
service it if defective.
No
Check D1008, C1007, C1038 and their periphery,
and service it if detective.
No
Check D1015, D1019, C018 and their periphery,
and service it if detective.
No
Check Q1005 and PWRCON line, and service it if
detective.
No
See FLOW CHART NO.8. <P-ON+12V is not
outputted. >
No
Check D1020,C1014,C1015, and their periphery,
and service it if detective.