Method For Diagnosing Degradation Of The Lds On The Pickup Assy - Pioneer DV-310-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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L 13942296513
C4096
R2309
R4017
006
Q2301
C2303
99
98
12
CP4003
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W802
C4102
W832
Q2304
NR2301
Q2302
R2306
R2307
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DVD MT PCB ASSY
B8004
C8036
IC2301 R8037
Q Q
3 6 7 1 3 1 5
J8001
C7324
R7324
J7301
B7305
R7315
R7318
J7302
R7317
R8079
R8084
Q8019
Q8018
J8003
R8085 R8080
W840
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DV-310-K
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9 4 2 8
If the measurements show degradation
of an LD, replace the PICKUP Assy.
DMG099A
B4007
IC4005
C4049
C7310
R4062
R4060
R7337
R7305
C7309
R4059 R4061
C7308
IC7301
C7307
C4012
C4072
C7305
R7306
C7306
97 65
R7308
0 5 8 2 9 9 4 2 8
C4011
IC4001
R4022
R4035
W826
L7301
1 33
R4024
W873
X4001
W829
W871 W872
C4007 R4031
R8063
R8048 C4089 R4015
R4016
R8049
C8067
W832
IC8003
C4096 R2309
C8069 Q2304
NR2301
R4017
IC4006
Q2301 Q2302
R8057
C2303
R4011
R2306
C4099 R2307
B4002
C4098
C4112
Q8013
CP4003
SIDE A
m
8
9 9
A
B
C
IC4003
C4134
9 9
IC4004
CP4004
R4053
R4054
D4003
C4002
R4072 R4063
C4140 IC4009
C2307 C2305
C4102 W802
R2319
D
IC2301
E
F
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