Hitachi DV-PF73U Service Manual page 24

FLOW CHART NO.5
The [No Disc] indication. (In case of focus error)
Replace the DVD Main CBA.
No improvement can be found.
Replace the DVD Mechanism.
FLOW CHART NO.6
The [No Disc] indication. (In case focus servo does not function.)
Replace the DVD Main CBA.
No improvement can be found.
Replace the DVD Mechanism.
FLOW CHART NO.7
The [No Disc] indication. (When the laser beam does not light.)
Replace the DVD Main CBA.
No improvement can be found.
Replace the DVD Mechanism.
FLOW CHART NO.8
Both picture and sound do not operate normally.
Replace the DVD Main CBA.
No improvement can be found.
Replace the DVD Mechanism.
Yes
Yes
Yes
Yes
No
Original DVD Main CBA is poor.
No
Original DVD Main CBA is poor.
No
Original DVD Main CBA is poor.
No
Original DVD Main CBA is poor.
3-5