19
XV-DV575
5
6
7
8
5
6
7
8
A
B
C
D
E
F
5. DIAGNOSIS
5.1 METHOD FOR DIAGNOSING DEGRADATION OF THE LDS ON THE PICKUP
Q304
Q305
Q307
Q30
8
L30
8
L309
R305
C
N
101
C
N
102
R313
C
N
104
R321
R322
R325
R326
C309
R152
R153
R154
C140
C141
R373
C372
R372
R374
R375
R371
R314
C1
CO
N
TACT
SIDE
SIDE
CO
N
TACT
UP SIDE
C
R157
R156
D
D
E
1
1
1
20
15
10
5
1
1
5
1
5
R321
R322
R325
R326
Case when this dia
g
nosis is re
q
uired :
W
hen playback of any disc, including a test disc (D
V
D: GG
V
1025, CD: STD-905), cannot be performed
How to dia
g
nose
In the case mentioned above, degradation of the laser diodes (LDs) mounted on the Pickup PCB is suspected.
Measure the voltage between the two ends of one of the resistors mentioned below.
Measure the voltage between the two ends of R322 or R325 on the 0
8
D
V
DM
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 R321 or R326 on the 0
8
D
V
DM
Assy. If the voltage is 0.4
V
or higher, the 7
8
0-nm LD is degraded.
No playback of a CD :
If the measurements show degradation
of an LD, replace the D
V
D MECHA
Assy.
SIDE A
A
0
8
DVDM ASSY