Method For Diagnosing Degradation Of The Lds On The Pickup Assy - Pioneer DV-310-S Service Manual

5

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

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.
R2307
R2306
Q2302
Q2301
R4017 NR2301
Q2304
R2309
W832
C4102
C4089 R4015 R4016
C4007
R4031
5
6
IC2301
R2319
W802
C2307 C2305
DV-310-S
6
7
If the measurements show degradation
of an LD, replace the PICKUP Assy.
DVD MT PCB ASSY
CP4003
Q8013
W840
C4112
C4098
R8083
B4002
C4099
R8085 R8080 R2307
R2306
Q8018 R4011
C2303
R8057
Q2301
IC4006
Q8019
R4017
R8084
R8079 R2309
C4096
R8076 C8069
Q8020
IC8003
R7317
C8067
R8049
R7318 C4089 R4015 R4016
R8048
R8063
C4007
R7315
B7305
IC7302
X4001
C7315
R4024
1
L7301
W826
R4035
R4022
IC4001
C4011
Q7305
R7308 97
C7306
R7306
C7305
C4072
C4012
C7307
R7301
C7308 D7305
R4059 R4061
R8037 D7306 C7309
R7305
C8036
R4060 R4062
B8004 C7310
DMG099A
B4007
SIDE A
7
8
A
B
C
Q2302
NR2301
Q2304
IC2301
W832
R2319
C4102
W802
C2307
C2305
R4031
W829
C4140 IC4009
R4072 R4063
C4002
33
D4003
R4054
R4053
IC4004
D
65
C4134
C4049
IC4003
IC4005
E
F
25
8