Hitachi DV-PF3A(S), Service Manual

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3-4
Yes
No
FLOW CHART NO.1
The key operation is not functioning.
Are the contact point and the installation state of
the key switches (SW2020-2022) normal?
When pressing each key switches (SW2020,
SW2021, SW2022), do the voltage of each pin
of CN2014 (shown below) change to "L" (0V) from
"H" (3.3V)?
SW2020
→
CN2014 1PIN
SW2021
→
CN2014 3PIN
SW2022
→
CN2014 4PIN
Check the key switches (SW2020, SW2021,
SW2022) and their periphery, and service it if
detective.
No
Re-install the key switches (SW2020, SW2021,
SW2022) correctly or replace the poor switch.
FLOW CHART NO.2
No DVD operation is possible from the remote control unit. (Operation is possible from the unit.)
Replace the RM2001 (remote control receiver).
Replace remote control unit if needed.
Check the line between the RM2001 (remote
control receiver) and Pin(22) of CN1051, and
service it if detective.
Is the "L" pulse sent out from Pin(1) terminal of the
RM2001 (remote control receiver) when the remote
control unit is activated?
Is the "L" pulse signal supplied to Pin(22) of
CN1051?
Replace the DVD Main CBA.
Yes
Yes
Replace DVD Main CBA.
Yes
Yes
Is 5V voltage supplied to Pin(3) terminal of the
RM2001 (remote control receiver)?
Yes
No
Check EV+5V line, and service it if detective.
No
No
FLOW CHART NO.3
The disc tray cannot be opened and closed. (It can be done using the remote control unit.)
Does the voltage of Pin(1) on CN2014 become 0V
when pressing "OPEN/CLOSE" button on the unit?
Refer to "FLOW CHAR NO.4" <The disc tray
cannot be opened and closed.>
Replace the "OPEN/CLOSE" button (SW2020).
No
Yes
FLOW CHART NO.4
The disc tray cannot be opened and closed.
Replace the DVD Main CBA.
Original DVD Main CBA is poor.
Replace the DVD Mechanism.
No improvement can be found.
No
3-1-2 DVD Section