XV-DV740
95
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C
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A
B
E
7.1.8 METHOD FOR DIAGNOSING DEGRADATION OF THE LDS ON THE PICKUP ASSY
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5
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1
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24
42
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C231
R102
CN104
CN103
R202
IC201
C221
R201
R221
R223
R222
R101
C222
C139
C142
CN101
R212
R211
IC101
C112
Q201
R220
R392
R391
C390
Q211
C306
C133
CN121
C103
CONTACT
SIDE
BOTTOM SIDE
BOTTOM S
BOTTOM SIDE
C
(650)
IDE
(780)
GNDD
V+5D
LD2
LD1
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 R201 on the DVDM Assy. If the
voltage is 0.7 V or higher, the 650-nm LD is degraded.
No playback of a DVD :
Measure the voltage between the two ends of R211 on the DVDM Assy. If the
voltage is 1.5 V or higher, the 780-nm LD is degraded.
No playback of a CD :
If the measurements show degradation
of an LD, replace the PICKUP Assy.
PICKUP ASSY
CN101
SIDE A
DVDM ASSY
B
R201
R211
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