Diagnosis; Method For Diagnosing Degradation Of The Lds On The Pickup - Pioneer XV-DV370 Service Manual

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5. DIAGNOSIS

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5.1 METHOD FOR DIAGNOSING DEGRADATION OF THE LDS ON THE PICKUP

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A
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-S is suspected.
Measure the voltage between the two ends of one of the resistors mentioned below.
No playback of a DVD :
B
Measure the voltage between the both ends of R322 or R325 on the DVD MAIN
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 DVD MAIN
Assy. If the voltage is 0.4 V or higher, the 780-nm LD is degraded.
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L 13942296513
PICKUP ASSY
D
CN101
R318
Q305
Q304
12
R313
E
C144
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C131
C146
23
C145
F
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R325 Q307
L308
C309
R326 R322
L309
Q308
R321
R772 C773
C320
R310
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R771
L772
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B
DVD MAIN ASSY
C310
Front side
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XV-DV370
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4
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If the measurements show degradation
of an LD, replace the 06SD Pickup
Assy-S.
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SIDE A
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