Pioneer DV-285-S, Service Manual

Page: 54 / 78

DV-285-S
54
1 2 3 4
1 2 3 4
C
D
F
A
B
E
7.1.6 METHOD FOR DIAGNOSING DEGRADATION OF THE LDS ON THE PICKUP ASSY
CP230 3
CP230 1
C
R2
3
2
6
R2
3
2
7
R23 10
R23 11 R23 13
R23 12
R2
3
1
6
R2
3
1
7
R2
3
1
8
R23 25
C40 02
C40 03
R23 38
R23 32
R23 33
R2
3
3
4
C2
3
1
0
R23 35
C23 11
C23 08
Q23 02
Q2
3
0
4
Q2
3
0
3
Q23 05
R2320
R2322
R2323
R2321
Q23 07 Q23 06
R2
3
0
6
R2
3
0
7
Q23 01
R2
3
0
9
R2
3
0
8
230 3 C23 01
C23 05
W81 9
R23 37
C2
3
2
0
W8
1
7
W8
0
9
To OPTICAL PICKU
CP2301
CP2303
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.
Measure the voltage between the two ends of R2321 or R2323 on the DVDM
Assy. If the voltage is 0.4 V or higher, the 650-nm LD is degraded.
No playback of a DVD :
Measure the voltage between the two ends of R2320 or R2322 on the DVDM
Assy. If the voltage is 0.4 V or higher, the 780-nm LD is degraded.
No playback of a CD :
If the measurements show degradation
of an LD, replace the DVD MECHA
Assy.
SIDE A
Front side
DVD MT PCB ASSY
A
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