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5.2 METHOD FOR DIAGNOSING DEGRADATION OF THE LDS ON THE PICKUP ASSY
QQ
3 7 63 1515 0
Case when this diagnosis is required :
When playback of any disc, including a test disc (DVD: GGV1025, CD: STD-905), cannot be performed
A
How to diagnose
In the case mentioned above, degradation of the laser diodes (LDs) mounted on the PICKUP Assy is suspected.
Measure the voltage between the two ends of one of the resistors mentioned below.
No playback of a DVD :
Measure the voltage between the two ends of NR2301 on the DVD MT PCB Assy.
If the voltage is 0.17 V or higher, the 650-nm LD is degraded.
B
No playback of a CD :
Measure the voltage between the two ends of NR2301 on the DVD MT PCB Assy.
If the voltage is 0.20 V or higher, the 780-nm LD is degraded.
C
DMG100A
TE
L 13942296513
D
E
www
F
28
1
http://www.xiaoyu163.com
2
W822
R4058
NR2301
x
ao
y
.
i
2
http://www.xiaoyu163.com
3
8
If the measurements show degradation
of an LD, replace the PICKUP Assy.
DVD MT PCB ASSY
R4044
R4051
Q Q
3
6 7
1 3
D4005
DMG100A
W822
NR2301
u163
.
DV-49AV
3
4
2 9
9 4
2 8
Q5906
Q4004
R4054
1 5
0 5
8
2 9
9 4
Q4002
W816
W864
R4064
NR4003
R4065
R4026
W807
Q7302
Q8017
R8069
R8053
R4058
Q8020
R8017
Q8010
Q8008
W878
Q8009
R8002
Q8015
R8066
R8025
Q8021
B8001
R8020
R8065
SIDE B
m
co
4
9 9
2 8
9 9
R7304
R7317
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