Method For Diagnosing Degradation Of The Lds On The Pickup Assy - Pioneer DV-400V-S Service Manual

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5.2 METHOD FOR DIAGNOSING DEGRADATION OF THE LDS ON THE PICKUP ASSY

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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.
No playback of a DVD :
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 CD :
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.
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DVD MT PCB ASSY
R4051
DMF090A
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R4058
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DV-400V-S
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If the measurements show degradation
of an LD, replace the PICKUP Assy.
R4044
Q4004
Q4002
0 5 8 2 9 R4003 9 4 2 8
W816
W864
R4064
R4065
R4026
R2327
W807
Q7302
R8004
W822
R4058
W809 R8066
Q8021
W808
R8065
R8061
R8028
SIDE B
m
8
9 9
A
B
C
9 9
R7304
R7317
R8086
Q8025
R8084
D
E
F
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