Sony MDS-M9 Service Manual page 15

4-5. 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 temperature.
Adjusting Method :
1. Rotate the SELECTOR knob and display "TEMP ADJUST".
2. Press the YES button and select the "TEMP ADJUST" 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 ADJUST".
When the NO button is pressed, "TEMP ADJUST" will be dis-
played.
Specifications :
The "TEMP = " should be within "E0 - EF", "F0 - FF", "00 - 0F",
"10 - 1F" and "20 - 2F".
4-6. Laser Power Adjustment
Connection :
Optical pick-up
objective lens
BD board
TP (I + 5V)
TP (IOP)
SAVE" will be
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 0 button or
) button and move the optical pickup.)
Connect the digital volt meter to TP (IOP) and TP (I+5V).
2. Rotate the SELECTOR knob and display "LDPWR ADJUST".
(Laser power : For adjustment)
3. Press the YES button twice and display "LD $ 4B = 3.5 mW".
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 mW".
(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 pick-up displayed value
(Optical pick-up label)
KMS 210A
27X40
B0825
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 ( Ω )
7. Press the YES button and display "LD $ 0F = 0.7 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 ± 0.1 mW
9. Press the NO button and display "LDPWR ADJUST', and stop
laser emission.
(The NO button is effective at all times to stop the laser emission.)
— 15 —
Laser power
meter
Digital voltmeter
+0.1
mW.
–0
± 10%