Sony HCD-GPX33 Service Manual page 19

Optical Block Diagnosis Flow (2/2)
A
Does laser diode become luminous ?
(Visual check)
Yes
DISC IN
Yes
Is output level of RF signal (CN507 6pin) up to standard?
RF Level = 1.0 ±0.25 Vpp
Test CD:YEDS-18
Yes
Is there no problem with Long term Aging Test (60min)?
Confirms that there is no sound skip.
Yes
END
Check JL806 (LD780) signal
Does it output 1.8V when laser become luminous?
No
Check JL802 (LD650) signal
Does it output 2.2V when laser become luminous?
Yes
The Optical pickup has a problems.
Replaces BU.
No
If it is not up to standard,
Lens cleaning is performed.
Yes
Is output level of RF signal(CN507 6pin) up to standard?
RF Level = 1.0 ±0.25 Vpp
Test CD:YEDS-18
Yes
No
The Optical pickup has a problems.
Replaces BU.
No
Checks circumference circuit of Q881 or Q891.
Checks circumference circuit of IC501 LDO1 and LDO2.
No
Replaces BU if it is not up to standard.