Method For Diagnosing Degradation Of The Lds On The Pickup Assy - Pioneer DV-210K-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
[1] 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.
C4007
R4015 R4016
C4089
TE
L 13942296513
R2309
R4017
Q2301
R2306
R2307
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R4031
C2307 C2305
C4102 W802
W832
IC2301
Q2304
NR2301
Q2302
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If the measurements show degradation
of an LD, replace the PICKUP Assy.
DVD MT PCB ASSY
DMG099A
B4007
B8004 C7310
R4060 R4062
C8036 R7337
R7305
C7309
R8037
R4059 R4061
C7308
C7307
C4012
C7305 C4072
C7306
97
C4011
IC4001
R4022
R4035
W826
L7301
1
1 5 0 5 8 2 9 9 4
R4024
W873
X4001
B7305
W871 W872
R7315
C4007
R8063
R8048
R7318 C4089
R8049
C8067
R7317
C7322
IC8003
C8069
R8079 C4096 R2309
R8084
R4017
Q8019
IC4006
Q2301
R8057
Q8018 R4011
R2306
C4099
R8085 R8080 R2307
B4002
C4098
W840
C4112
Q8013
CP8003 CP4003_1
SIDE A
m
co
7
8
9 9
A
B
IC4005
IC4003
C4049 C
C4134
65
IC4004
R4053
R4054
33
2 8 9 9
C4002
W829
R4031
C2307 C2305
R4015 R4016
C4102 W802
R2319
W832
IC2301
Q2304
NR2301 D
Q2302
E
F
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