Method For Diagnosing Degradation Of The Lds On The Pickup Assy - Pioneer XV-DV358 Service Manual

5

7.1.7 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), won't play or doesn't play
How to diagnose
In the case mentioned above, degradation of the laser diodes (LDs) mounted on the 06SD 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 both ends of R322 or R325 on the DVDM
Assy. If the voltage is 0.4 V or higher, the 650-nm LD is degraded.
No playback of a CD :
Measure the voltage between the both ends of R321 or R326 on the DVDM
Assy. If the voltage is 0.4 V or higher, the 780-nm LD is degraded.
PICKUP ASSY
CN101
R318
Q305
Q304
12
R313
R772
C144
C131
C146
23
3 C145
IC771
5
6
ICT FC
Q307
R322
Q308
C309
R321
R325
L308
C310
R326
L309
R3952
R3954
L3952
L3951
R3953
C773
R3951
R771
L772
6
7
If the measurements show degradation
of an LD, replace the 06SD Pickup
Assy.
B
DVD MAIN ASSY
Front side
C
XV-DV353
7
8
SIDE A
8
A
B
C
D
E
F
75