26
MHC-V21/V21D
Ver. 1.1
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
Te
st
d
is
c
(C
D
: Y
ED
S-
18, DVD: HLX-503 (NTSC) or HLX-504 (PAL))
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?
The Optical pickup has a problem.
Replaces BU.
DISC IN
No
A
Is output level of RF signal JL317 up to standard?
RF Level = 1.05
±
0.45 Vpp
Test disc (CD: YEDS-18
, D
VD
: H
LX
-503 (NTSC) or HLX-504 (PAL))
Replaces BU if it is not up to standard.
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Checks circumference circuit of Q402.
Checks circumference circuit of IC301 LDO1.
If it is not up to standard,
Lens cleaning is performed.
The Optical pickup has a problem.
Replaces BU.
SYS SET
2018/08/28 21:56:45 (GMT+09:00)
