Panasonic AG520VDH - COMB. DVD/VCR/TV, Service Manual, Page: 11 / 100

5.1.5. DVD SERVICE MODE
This unit has a Self-Diagnostic function which detects a
problem or malfunction within the unit and displays on the TV
screen.
5.1.5.1. How to enter DVD Service Mode
1. Set the unit to DVD mode.
2. Press and hold STOP/EJECT, PLAY, and VOL - buttons of
VCR operation panel of the unit together for over 5 seconds
with no cassette inserted. The adjustment overlay will
appear on the TV screen.
Fig. 5-1
3. Press DISPLAY key on the remote control to enter the DVD
Service Mode I.
Fig. 5-2
4. Press the LEFT or RIGHT key on the remote again to enter
DVD Service Mode II.
Fig. 5-3
Note:
a. After replacing the DVD Unit, press the CLEAR key
on the remote in this mode. The total elapsed "Disc
Motor on" time (in hours/minutes) will be cleared to
0.
b. If 01 or 02 is always displayed in 9 DM STATUS,
replace the DVD Unit because the Disc Motor is
defective.
5. To confirm the value of JITTER and the value of LASER
(current), insert the DVD Test Disc into the DVD Unit.
6. To release from this mode, turn off the power.
5.1.5.2. Troubleshooting hint (standard)
for this mode
It can be determine if the DVD Mechanism Unit is defective by
checking the value of JITTER and the value of LASER
(current).
11
AG-520VDH