Sony HCD-J300 Service Manual page 31

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2. PRECAUTIONS FOR CHECKING LASER DIODE
EMISSION
To c hec k the emission of the laser diode during adjustments,
view directl y from the top as this ma
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
Before disconnecting the connector
the connector , be careful not to remo
measures to pre vent dama ge b y static electricity
boar d with care as it breaks easil
pick-up
Optical pick-up flexible board
4. PRECAUTIONS FOR ADJUSTMENTS
1. When replacing the f
TE
and c hec ks with
L 13942296513
2. Set the MD test mode when performing adjustments.
After completing the adjustments,
Perform the adjustments and checks in "Group Service" of the
MD test mode.
3. Perform the adjustments to be needed in the or
4. Use the f ollo wing tools and measuring de
• 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
or
MD Laser po wer meter 8010S (P
• Oscilloscope (Measure after perf
• Digital v oltmeter
• Thermometer
• Jig f or c hec king BD boar d wa veform
(Par t No. : J-2501-196-A)
Adjustment
7. Initial setting of adjustment value
8. Recording of Iop information
9. Temperature compensation
offset adjustment
10. Laser power adjustment
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11. Iop NV Save
12. Traverse adjustment
.
13. Focus bias adjustment
16. Auto gain adjustment
6-4. AUTO CHECK
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y lose y our e ye-sight.
xib le boar d when using it.
, desolder fir st. Before connecting
ve the solder . Also take adequate
. Handle the fle xible
y.
flexible board
laser tap
ollo wing par ts, perf orm the adjustments
in the or der sho wn in the f ollo wing tab le.
exit the MD test mode
der sho wn.
vices.
ar t No. : J-2501-046-A)
ar t No. : J-2501-145-A)*
orming CAL of pr ove .)
Optical
Pick-up
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5. When obser ving se veral signals on the oscilloscope
make sure that
oscilloscope.
ne ver
(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
that no dusts nor fing
1 Laser power meter
*
When perf orming laser po
adjustment), use of the ne w MD laser po wer meter 8010S (P
No. J-2501-145-A) instead of the con
meter is con venient.
It sharpl y reduces the time and tr
meter sensor onto the objective lens of optical pic
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.
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Parts to be replaced
IC101 IC102 IC151
co
.
HCD-J300
9 4 2 8
VC and gr ound do not connect inside the
.
ect the adjustment results,
erprints are attac hed to it.
wer c hec ks and adjustment (electrical
ventional laser po
oub le to set the laser po
0 5 8 2 9 9 4 2 8
IC190 IC195
m
9 9
, etc.,
make sure
ar t
wer
wer
k-up.
9 9
D101
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