Read Sony CMT-DC500MD / HCD-J300 Service Manual online
31
HCD-J300
2. PRECAUTIONS FOR CHECKING LASER DIODE
EMISSION
To c hec k the emission of the laser diode during adjustments,
ne ver
vie w directl y from the top as this ma
y lose y our e ye-sight.
3. PRECAUTIONS FOR USE OF OPTICAL PICK-
UP (KMS-260B/260E)
As the laser diode in the optical pick-up is easily damaged by static
electricity , solder the laser tap of the fle
electricity , solder the laser tap of the fle
xib le boar d when using it.
Before disconnecting the connector
, desolder fir st. Before connecting
the connector
, be careful not to remo
ve the solder
. Also take adequate
measures to pre
vent dama ge b y static electricity
. Handle the fle xible
boar d with care as it breaks easil
y.
Optical pick-up flexible board
4. PRECAUTIONS FOR ADJUSTMENTS
1.
When replacing the f
ollo wing par ts, perf orm the adjustments
and c hec ks with
in the or der sho wn in the f ollo wing tab le.
2.
Set the MD test mode when performing adjustments.
After completing the adjustments,
After completing the adjustments,
exit the MD test mode
.
Perform the adjustments and checks in “Group Service” of the
MD test mode.
MD test mode.
3.
Perform the adjustments to be needed in the or
der sho wn.
4.
Use the f ollo wing tools and measuring de
vices.
•
Chec k Disc (TD YS-1) (P ar t No. : 4-963-646-01)
•
Test Disk (MD W-74/GA-1) (P ar t No. : 4-229-747-01)
•
Laser po wer meter LPM-8001 (P
ar t No. : J-2501-046-A)
or
MD Laser po wer meter 8010S (P
MD Laser po wer meter 8010S (P
ar t No. : J-2501-145-A)*
1
• Oscilloscope (Measure after perf
orming CAL of pr ove .)
• Digital v oltmeter
• Thermometer
• Jig f or c hec king BD boar d wa veform
• Thermometer
• Jig f or c hec king BD boar d wa veform
(Par t No. : J-2501-196-A)
pick-up
flexible board
laser tap
5.
When obser ving se veral signals on the oscilloscope
, etc.,
make sure that
VC and gr ound do not connect inside the
oscilloscope.
(VC and ground will become short-circuited.)
(VC and ground will become short-circuited.)
6.
Using the abo
ve jig enab les the wa veform to be c hec ked without
the need to solder
.
(Refer to Servicing Notes on page 8.)
7.
As the disc used will aff
ect the adjustment results,
make sure
that no dusts nor fing
erprints are attac
hed to it.
*
1
Laser power meter
When perf orming laser po
wer c hec ks and adjustment (electrical
adjustment), use of the ne
w MD laser po wer meter 8010S (P
ar t
No. J-2501-145-A) instead of the con
ventional laser po
wer
meter is con venient.
It sharpl y reduces the time and tr
It sharpl y reduces the time and tr
oub le to set the laser po
wer
meter sensor onto the objective lens of optical pic
k-up.
7.
Initial setting of adjustment value
8.
Recording of Iop information
9.
Temperature compensation
offset adjustment
10. Laser power adjustment
11. Iop NV Save
12. Traverse adjustment
13. Focus bias adjustment
16. Auto gain adjustment
6-4. AUTO CHECK
Optical
Pick-up
IC101
IC102
IC151
IC190
IC195
D101
Parts to be replaced
Adjustment
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