MDS-B5 - Sony Audio Service Manual (repair manual). Page 12

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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 tem-
perature.

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 AMS knob and display “TEMP ADJUST”.
2. Press the ENTER/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 ENTER/YES button.

When not saving the data, press the EDIT/NO button.

5. When the ENTER/YES button is pressed, “TEMP = 

 SAVE”

will be displayed for some time, followed by “TEMP ADJUST”.
When the EDIT/NO button is pressed, “TEMP ADJUST” will be
displayed.

The “TEMP =  

” should be within “E0 - EF”, “F0 - FF”, “00 - 0F”,

“10 - 1F” and “20 - 2F”.

Adjusting Method :
1. Set the laser power meter on the objective lens of the optical pickup.

(When it cannot be set properly, press the 

0 button or ) but-

ton and move the optical pickup.)
Connect the digital volt meter to TP (IOP) and TP (I+5V).

2. Rotate the AMS knob and display “LDPWRADJUST”.

(Laser power : For adjustment)

3. Press the ENTER/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

 mW.

5. Press the ENTER/YES button and display “LD $ 96 = 7.0 mW”.

(Laser power:MO reading)

6. Check that the laser power meter and digital voltmeter readings

satisfy the specified value.

Laser power meter reading : 7.0 ± 0.3 mW
Digital voltmeter reading : Optical pickup displayed value ± 10%

(Optical pickup label)

+0.1
–0

Laser power
meter

Optical pick-up
objective lens

Digital voltmeter

KMS

210A

27X40
B0825

n

lop = 82.5 mA in this case
lop (mA) = Digital voltmeter reading (mV)/ 1 (

Ω

)

7. Press the ENTER/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.

Laser power meter reading : 0.70 ± 0.1 mW

9. Press the EDIT/NO button and display “LDPWR ADJUST’, and

stop laser emission.
(The EDIT/NO button is effective at all times to stop the laser
emission.)

BD board
TP (I + 5V)
TP (IOP)