19
DV-420V-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 regarding video
Item to be checked regarding audio
Block noise
Distortion
Horizontal noise
Noise
Dot noise
Volume too low
Disturbed image (video jumpiness)
Volume too high
Too dark
Volume fluctuating
Too bright
Sound interrupted
Mottled color
N
o.
P
rocedures
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.
Video, audio and operations must be normal.
Play back a DVD.
(Menu operation, Title/chapter search)
Play back a CD.
(track search)
Audio and operations must be normal.
Video, audio and operations must be normal.
Check the appearance of the product.
No scratches or dirt on its appearance after receiving it
for service.
Items to be checked after servicing /
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.
Before shipping out the product, be sure to clean the following positions by using the prescribed cleaning tools.
N
ame
P
art
N
o.
R
emarks
Refer to “9.3 DVD MECHA SECTION”.
Cleaning liquid
GEM1004
Cleaning paper
GED-008
N
o.
P
rocedures
Check points
1
Confirm playback error rates at the innermost and
outermost tracks by using the following disc.
DVD test disc (NTSC:GGV1025, PAL:GGV1101)
The error rates must be less than 5.0e-4.
(This procedure can determine if the drive is
degraded.)
S
pecific Items to be Checked
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299