Method For Diagnosing Degradation Of The Lds On The Pickup Assy - Pioneer DV-410V-K 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 NR2301 on the DVD MT PCB Assy.
If the voltage is 0.17 V or higher, the 650-nm LD is degraded.
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.
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W822
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DVD MT PCB ASSY
80
DMG100A
R4051
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3 6 7 1 3 1 5
D4005
R4058
NR2301
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DV-410V-K
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If the measurements show degradation
of an LD, replace the PICKUP Assy.
R4044
Q4004
W857
Q4002
R4003
0 5 8 2 9 9 4 2 8
W816
W864
NR4003 R4064
R4065
R4026
R2327
W807
Q7302
B7301
R8004
W822
R4058
W809
W808
R8020
R8065
R8028
SIDE B
m
8
9 9
A
B
C
Q5906
9 9
D7310
R7304
R8086
Q8025
D
R8084
R8066
Q8019 Q8021
E
F
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