Method For Diagnosing Degradation Of The Lds On The Pickup Assy - Pioneer DV-510K-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
[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.
X4001
W829
R4031
C4007
C4089 R4015 R4016
W832
R2309
Q2304
R4017 NR2301
Q2301
Q2302
03
R2306
R2307
5
6
C4140
IC4009
C2307 C2305
C4102 W802
R2319
IC2301
6
7
If the measurements show degradation
of an LD, replace the PICKUP Assy.
DVD MT PCB ASSY
B8004
C8036
R8037
R7308
Q7305
B7305
R7315
R8063
R7318
C8067
R7317
IC8003
Q8020
C8069
R8076
R8079
R8084
Q8019
Q8018
R8085 R8080
R8083
W840
Q8013
DMG099A
DV-510K-S
7
8
B4007
IC4005
C4049
C7310
R4060 R4062
R7305
C7309
D7306
R4059 R4061
C7308 D7305
R7301
C7307
C4012
C4072
C7305
R7306
C7306
C4134
97 65
IC4004
C4011
IC4001
R4022 R4053
R4035
W826 R4054
D4003
L7301
1 33
C4002
R4024
C7315
C4140
X4001
IC7302
W829
R4031
C4007
C2307 C2305
R8048
C4089 R4015 R4016
R8049 C4102 W802
W832
IC2301
C4096 R2309
Q2304
NR2301
R4017
IC4006
Q2301
Q2302
R8057
C2303
R4011
R2306
C4099 R2307
B4002
C4098
C4112
CP4003
CP8003
SIDE A
8
A
B
IC4003 C
R4072 R4063
IC4009
R2319
D
E
F
25