Dvd Section - Hitachi DV-PF73U Service Manual

3-1-2 DVD Section

FLOW CHART NO.1
The key operation is not functioning.
Are the contact point and the installation state of
the key switches (SW2001-2003) normal?
When pressing each key switches (SW2001,
SW2002, SW2003), do the voltage of each pin
of CN2001 (shown below) change to "L" (0V) from
"H" (3.3V)?
SW2001 → CN2001 4PIN
SW2002 → CN2001 2PIN
SW2003 → CN2001 1PIN
Replace DVD Main CBA.
FLOW CHART NO.2
No DVD operation is possible from the remote control unit. (Operation is possible from the unit.)
Is 5V voltage supplied to Pin(3) terminal of the
RM2001 (remote control receiver)?
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
CN1001?
Replace the DVD Main CBA.
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(4) on CN2001 become 0V
when pressing "OPEN/CLOSE" button on the unit?
Refer to "FLOW CHAR NO.4" <The disc tray
cannot be opened and closed.>
FLOW CHART NO.4
The disc tray cannot be opened and closed.
Replace the DVD Main CBA.
No improvement can be found.
Replace the DVD Mechanism.
3-4
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Re-install the key switches (SW2001, SW2002,
SW2003) correctly or replace the poor switch.
No
Check the key switches (SW2001, SW2002,
SW2003) and their periphery, and service it if
detective.
No
Check AL+5V line, and service it if detective.
No
Replace the RM2001 (remote control receiver).
Replace remote control unit if needed.
No
Check the line between the RM2001 (remote
control receiver) and Pin(22) of CN1001, and
service it if detective.
No
Replace the "OPEN/CLOSE" button (SW2001).
No
Original DVD Main CBA is poor.