Troubleshooting - Hitachi DV-PF2U Service Manual

FLOW CHART NO.1
The power cannot be turned on.(1)
Is the fuse normal?
Is normal state restored when once unplugged
power cord is plugged again after several seconds.
Is the EV 5V line voltage normal?
Is the voltage of EV 12V, EV -30V and filament
voltage normal?
FLOW CHART NO.2
The power cannot be turned on.(2)
Does the change from STANDBY LED indicate
turn-off?
Is the supply voltage of 3.3V fed to Q2021?
Is the supply voltage of 5V fed to pin(3) of IC2001?
Is the "H" signal inputted at base of Q2021,
when the POWER button activated on the DVD?
Is the "H" signal inputted at base of Q2021,
when the POWER button activated on the remote
control unit?
Replace IC601.
The STANDBY LED indicate is flashing after 0.5 sec.
Are the "P-CON-H" pulse outputted from the
Pin(207) of IC601?
Is the P-CON switch circuit operated normally?
(Q1002, Q1005, Q1006, IC1002, D1036, D1046)
FLOW CHART NO.3
The fuse blows out.
Is there leaking or short-circuited primary
component?

TROUBLESHOOTING

Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes (below, confirmed operating at LED turn-off of 0.5 sec. interval.)
Yes
No
Replace the fuse.
See FLOW CHART No.3 <The fuse blows out.>
No Check for lead or shor-circuiting of primary
circuit component?
(Q1001, Q1003, D1001, D1002, D1004, D1005,
No
D1011, T1001, C1003, C1005, etc.)
No
Check each rectifying circuit of secondary circuit.
Yes
No
Check the EV 3.3V line.
No
Check the IC2001.
No
Check the SW2008 and POWER button line.
No
Check the line between the remote control
receiver and the pin(125) of IC601.
Replace IC601.
No
No
Check each component and if poor the replace.
Check for short-circuiting of rectifying diode and
circuit in each rectifying circuit of secondary side.
No
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