DV-400V-S
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F
A
B
E
5.2
METHOD FOR DIAGNOSING DEGRADATION OF THE LDS ON THE PICKUP ASSY
C4086
W804
R4028
R4058
W832
W822
R2321
R2323
R2320
R2322
C2303
C2302
B4014
Case when this diagnosis is required :
When playback of any disc, including a test disc (DVD: GGV1025, 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 R2321 or R2323 on the DVDM
Assy. If the voltage is 0.4 V or higher, the 650-nm LD is degraded.
No playback of a DVD :
Measure the voltage between the two ends of R2320 or R2322 on the DVDM
Assy. If the voltage is 0.4 V or higher, the 780-nm LD is degraded.
No playback of a CD :
If the measurements show degradation
of an LD, replace the PICKUP Assy.
SIDE B
DVD MT PCB ASSY
DMF090A
R4060
C4071
C4080
C4081
C4082
W827
C5921
C4088
C4068
C4072
C4073
C4054
C4102
C4101
C4120
C4052
C4064
R4001
C4055
C4051
R4014
R4004
C4022
C4040
C4025
R4044
C4021
R4054
C4086
C4029
R4039
C4036
W813
C4037
C4038
R4003
C4001
C4002
C4003
C4020
C4008
C4009
R4005
C4105
C4007
C4005
C4019
C4013
C4017
C4016
C4015
C4014
C4026
W816
R4020
C4027
C4028
C4033
R4022
C4034
C4035
C4041
C4043
C4049
C4048
C4046
R4057
R
4053
C4061
R4069
R4068
W828
Q4002
R4048
C4084
C4065
R4006
R4008
C4110
C4066
C4067
R7304
R7305
R7316
R7317
C7330
C7317
C7302
C7313
Q7302
R7315
C7305
R4067
C4083
R4066
C4074
R4065
R4064
R4061
R4002
W804
R8097
C8042
C8054
C8006
R8099
C8051
R8063
R8064
C8055
R8066
C8062
C8046
R8061
R8075
R8087
Q8021
C8005
R8096
W808
W809
R8084
B8004
Q8025
R8083
R8086
R8089
R4028
R4058
W832
W822
W821
R4051
C4030
C4012
R8004
R4026
R2321
R2323
R2320
R2322
C2303
C2302
R2318
R2327
W868
W856
R4009
C4128
W807
B4014
W857
W858
C5901
B4015
R8065
C5925
C2308
B4018
Q4004
B4016
R8059
W864
W862
R8028
C4131
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