34
DV-420V-K
1
2
3
4
A
B
C
D
E
F
1
2
3
4
5.3 METHOD FOR DIAGNOSING DEGRADATION OF THE LDS ON THE PICKUP ASSY
B40
0
B400
1
C405
6
C5922
R
590
1
C4
11
9
Q2303
Q2305
C232
1
C2320
R
230
6
R
2307
R
23
1
9
R
C23
1
2
C230
6
Q2
3
0
6
R
2329
_
W
84
1
W
845
R
730
6
R
592
1
C5924
IC5902_
1
IC400
6
C4092
R
40
11
C40
11
C4
1
00
NR
230
1
R
2308
C
P
2
3
0
2
IC4009
C4
1
40
C4
1
39
W
8
6
0
C23
1
C23
0
C
P
230
1
C2304_
1
R
4030
028
1
6
5
1
29
1
93
R
59
1
9
R
5920
IC4005
IC4002
NR
4002
C40
6
9
R
4082
R
4083
R
407
1
R
4070
C4050
C4
1
23
IC4004
NR
400
1
R
4035
C4
1
35
C4098
B4002
B400
1
C405
6
C5922
R
590
1
W
8
1
5
R
40
1
8
R
40
1
9
R
40
1
7
R
40
1
5
R
40
16
C4032
C403
1
C4042
C4044
C4047
R
4024
R
4025
R
4027
B4007
R
7320
R
73
1
9
IC730
1
C73
1
4
C73
1
5
J7302
C
P
730
1
B7305
C73
1
9
C73
1
2
C7304
J8003
R
808
1
Q8
0
2
3
R
8085
R
8090
R
8088
R
809
1
R
8080
Q8
0
2
4
J800
1
C80
66
_
1
R
80
16
C4
11
9
C4
1
03
R
4032
R
4033
C4
1
24
C4
1
25
R
403
6
Q2303
Q2305
C232
1
C2320
R
230
6
R
2307
R
23
1
9
R
233
1
R
2342
C2322
C2323
C23
1
2
R
23
1
7
W
802
R
2325
C230
6
IC400
1
W
855
D
73
1
3
C4
11
7
C4024
C40
6
3
C40
6
2
W
839
W
8
61
R
4059
Q2
3
0
6
C4
1
42
R
4007
C4
1
34
B590
1
W
830
L5
9
0
1
L
5902
B40
1
0
R
7302
R
7303
C5925
R
2329_
1
C4
1
02
C4003
C4002
C400
1
C4007
C4038
Q5
9
0
3
W
825
R
5902
W
884
W
84
1
W
842
W
823
Q7305
Q730
6
W
845
C7309
C7308
C7307
C730
6
IC7302
D
73
1
4
C5908
R
730
6
C5909
C
P
4003
C80
6
8
Q80
1
2
R
8038
IC8008
C8058
C80
6
9
C80
6
7
C8050
R
80
61
C80
6
2
R
8059
C804
6
C8055
Q8002_
1
R
8020
C4099
C4
11
2
R
592
1
C5924
IC5902_
1
IC400
6
C4092
R
40
11
C40
11
C4023
C4
1
00
X400
1
Q4
0
0
1
NR
230
1
R
2308
C
P
2
3
0
2
C
P
590
1
IC4009
C4
1
40
C4
1
39
W
8
6
0
IC230
1
C23
11
C2307
C2305
R
23
11
C
P
4004
L400
1
D
4002
D
4003
C
P
4002
R
405
1
C73
16
C73
1
8
C8038
C2325
D
590
1
C59
1
0
R
5922
R
8098
Q4008
R
4073
R
40
6
0
R
4072
C409
1
R
40
6
2
C
P
230
1
C2304_
1
Q4005
R
4037
R
4030
R
4028
C4078
C80
11
C80
1
2
C40
6
0_
1
C4
1
32
MO
T
OR
POW
E
R
A
V
M
IC
ON
DM
J
1
24A
P
AL/
N
T
S
C
3
G
A30C5
Case when this diagnosis is required :
When playback of any disc, including a test disc (DVD: GGV1025(NTSC)/GGV1101(PAL), CD: STD-905), cannot be performed
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.
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.
N
o playback of a
DVD
:
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.
N
o playback of a C
D
:
If the measurements show degradation
of an LD, replace the PICKUP Assy.
S
I
D
E A
DVD MT PCB A
SS
Y
for
DVD
laser diode
for C
D
laser diode
www. xiaoyu163. com
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