Sony MDS-DRE1 Service Manual page 16

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 tem-
perature of this part has become the ambient temperature.
Adjusting Method:
[AMS]
1. Rotate the knob and display "TEMP ADJUS".
[ENTER/YES]
2. Press the button and select the "TEMP ADJUS"
mode.
3. "TEMP = " and the current temperature data will be displayed.
4. To save the data, press the
When not saving the data, press the
[ENTER/YES]
5. When the button is pressed, "TEMP =
will be displayed for some time, followed by "TEMP ADJUS".
[EDIT/NO]
When the button is pressed, "TEMP ADJUS" will
be displayed.
Specifications:
The "TEMP = " should be within "E0 - EF", "F0 - FF", "00 -
0F", "10 - 1F" and "20 - 2F".
[ENTER/YES]
button.
[EDIT/NO]
button.
SAV"
Laser Power Adjustment
Connection:
Optical pick-up
objective lens
BD board
TP57 (I + 5V)
TP58 (IOP)
Adjusting Method:
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the
[ ]
ton or ) button and move the optical pick-up.)
Connect the digital volt meter to TP58 (IOP) and TP57 (I+5V).
2. Rotate the [AMS] knob and display "LDPWR ADJUS".
(Laser power : For adjustment)
[ENTER/YES]
3. Press the
3.5 mW".
4. Adjust RV102 of the BD board so that the reading of the laser
power meter becomes 3.4
[ENTER/YES]
5. Press the
mW".
(Laser power: MO writing)
6. Check that the laser power meter and digital voltmeter read-
ings 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 )
[ENTER/YES]
7. Press the
mW".
(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
[EDIT/NO]
9. Press the
and stop laser emission.
[EDIT/NO]
(The button is effective at all times to stop the la-
ser emission.)
– 16 –
Laser power
meter
Digital voltmeter
[ ]
button twice and display "LD $ 4B =
+ 0.1
mW.
– 0
button and display "LD $ 96 = 7.0
button and display "LD $ 0F = 0.7
+ 0.05
mW
– 0.1
button and display "LDPWR ADJUS",
0 but-