Sony MDS-JA50ES Service Manual page 33

Temperature Compensation Offset Adjustment
Save the temperature data at that time in the non-volatile memory
as 25 ˚C reference data.
Note :
1. Usually, do not perform this adjustment.
2. Perform this adjustment in an ambient temperature of 22 ˚C to
28 ˚C. Perform it immediately after the power is turned on when
the internal temperature of the unit is the same as the ambient
temperature.
3. When D101 has been replaced, perform this adjustment after
the temperature of this part has become the ambient tempera-
ture.
Adjusting Method :
1. Rotate the AMS knob and display "TEMP ADJUS".
2. Press the YES button and select the "TEMP ADJUS" mode.
3. "TEMP = " and the current temperature data will be displayed.
4. To save the data, press the YES button.
When not saving the data, press the NO button.
5. When the YES button is pressed, "TEMP =
displayed for some time, followed by "TEMP ADJUS".
When the NO button is pressed, "TEMP ADJUS" will be dis-
played.
Specifications :
The "TEMP = " should be within "E0 - EF", "F0 - FF", "00 -
0F", "10 - 1F" and "20 - 2F".
Laser Power Adjustment
Connection :
Optical pick-up
objective lens
Adjusting Method :
SAV" will be
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the 0 button
or ) button and move the optical pick-up.)
Connect the digital volt meter to TP (IOP) and TP (I+5V).
2. Rotate the AMS knob and display "LDPWR ADJUS".
(Laser power : For adjustment)
3. Press the YES button twice and display "LD $ 4B = 3.5 m".
4. Adjust RV102 of the BD board so that the reading of the laser
power meter becomes 3.4
5. Press the YES button and display "LD $ 96 = 7.0 m".
(Laser power : MO writing)
6. Check that the laser power meter and digital voltmeter readings
satisfy the specified value.
Specification :
Laser power meter reading : 7.0 ± 0.3 mW
Digital voltmeter reading : Optical pickup displayed value ± 10%
(Optical pickup label)
KMS
210A
27X40
B0825
lop = 82.5 mA in this case
lop (mA) = Digital voltmeter reading (mV)/ 1 ( Ω )
7. Press the YES button and display "LD $ 0F = 0.7 m".
(Laser power : MO reading)
8. Check that the laser power meter at this time satisfies the speci-
fied value.
Specification :
Laser power meter reading : 0.70 ± 0.1 mW
9. Press the NO button and display "LDPWR ADJUS", and stop
laser emission.
(The NO button is effective at all times to stop the laser emis-
sion.)
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Laser power
meter
Digital voltmeter
BD board
TP (I + 5V)
TP (IOP)
+0.1
mW.
–0