11
DV-120-K
5
6
7
8
5
6
7
8
A
B
C
D
E
F
3. BASIC ITEMS FOR SERVICE
3.1 CHECK POINTS AFTER SERVICING
Item to be checked re
g
ardin
g
video
Item to be checked re
g
ardin
g
audio
Block noise
Distortion
Horizontal noise
N
oise
Dot noise
V
olume too low
Disturbed image (video jumpiness)
V
olume too high
Too dark
V
olume fluctuating
Too bright
Sound interrupted
Mottled color
No.
Procedures
Check points
1
2
3
4
5
Confirm the firmware version on Test Mode.
The version of the firmware must be latest.
Update firmware to the latest one, if it is not the latest.
Confirm whether the customer complain has been solved.
If the customer complain occurs with the specific disc, use it for
the operation check.
The customer complain must not be reappeared.
V
ideo, audio and operations must be normal.
Play back a D
V
D.
(Menu operation, Title/chapter search)
Play back a CD.
(track search)
Audio and operations must be normal.
V
ideo, audio and operations must be normal.
Check the appearance of the product.
N
o scratches or dirt on its appearance after receiving it for
service.
Items to be checked after servicin
g
/ DV
To keep the product quality after servicing, confirm recommended check points shown below.
See the table below for the items to be checked regarding video and audio.
No.
Procedures
Check points
1
Confirm playback error rates at the innermost and outermost
tracks by using the following disc.
D
V
D test disc (GG
V
1025)
The error rates must be less than 5.0e-4.
(This procedure can determine if the drive is degraded.)
Specific Items to be Checked
