HCD-GPX555/GPX888
19
Optical Block Diagnosis Flow (2/2)
Does laser diode become luminous ?
(Visual check)
Is output level of RF signal (JL317) up to standard?
RF Level = 1.05 ±0.45 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
Checks JL306 (LD780) signal.
Does it output 2V when laser become luminous?
Checks circumference circuit of Q402.
Checks circumference circuit of IC301 LD01.
The Optical pickup has a problems.
Replaces BU.
DISC IN
No
A
Is output level of RF signal (JL317) up to standard?
RF Level = 1.05 ±0.45 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
