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HCD-GPX33/GPX55/GPX77/GPX88
19
Optical Block Diagnosis Flow (2/2)
Does laser diode become luminous ?
(Visual check)
Is output level of RF signal (CL574) up to standard?
RF Level = 1.0 ±0.25 Vpp
Test CD:YEDS-18
Is there no problem with Long term Aging Test (60min)?
Confirms that there is no sound skip.
END
No
No
Check JL802 (LD650) signal
Does it output 2.2V when laser become luminous?
Check JL806 (LD780) signal
Does it output 1.8V when laser become luminous?
Checks circumference circuit of Q881 or Q891.
Checks circumference circuit of IC501 LDO1 and LDO2.
The Optical pickup has a problems.
Replaces BU.
DISC IN
No
A
Is output level of RF signal (CL574) up to standard?
RF Level = 1.0 ±0.25 Vpp
Test CD:YEDS-18
Replaces BU if it is not up to standard.
No
No
If it is not up to standard,
Lens cleaning is performed.
The Optical pickup has a problems.
Replaces BU.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Ver. 1.1
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