DHC-EX880MD, DHC-MD717, MDS-EX880, MDS-MS717 - Sony Audio Service Manual (repair manual). Page 15

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Save the temperature data at that time in the non-volatile memory
as 25°C reference data.

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 of 22
°C to 28 °C.

3.

When D101 has been replaced, perform this adjustment after the tem-
perature of this part has become the ambient temperature.

Adjusting Method:
1. Turn the 

[     

=

 

        SELECTOR      

+

 

        ]

 dial and display “TEMP

ADJUST”.

2. Press the 

[ENTER/YES]

 button and select the “TEMP AD-

JUST” mode.

3. “TEMP = 

” and the current temperature a data will be dis-

played.

4. To save the data, press the 

[ENTER/YES]

 button.

When not saving the data, press the 

[MENU/NO]

 button.

5. When the 

[ENTER/YES]

 button is pressed, “TEMP = 

SAVE” will be displayed for some time, followed by “TEMP
ADJUST”.
When the 

[MENU/NO]

 button is pressed, “TEMP ADJUST”

will be displayed immediately.

Specifications:
The temperature should be within “E0-EF”, “F0-FF”, “00-0F”,
“10-1F” and “20-2F”.

Preparation:
Referring to “3. Disassembly”, remove the Base Unit from MD
Mechanism Deck.

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

) button

or

0 button and move the optical pick-up.)

Connect the digital voltmeter to TP29 (IOP+) and TP30
(IOP–) of the BD board.

2. Turn the 

[     

=

 

        SELECTOR      

+

 

        ]

 dial and display “LDPWR

ADJUST”.
(Laser power: for adjustment)

3. Press the 

[ENTER/YES]

 button and display “LD 0.9 mW $

”.

4. Turn the 

[     

=

 

        SELECTOR      

+

 

        ]

 dial so that the reading

of the laser power meter becomes 0.82 to 0.93 mW.
Set the range control on the laser power meter to 10 mW, then
press the 

[ENTER/YES]

 button to save the adjustment result

in the non- volatile memory.
(“LD SAVE $ 

” will be displayed for a moment.)

5. Then “LD 7.0 mW $ 

”will be displayed.

6. Turn the 

[     

=

 

        SELECTOR      

+

 

        ]

 dial so that the reading

of the laser power meter becomes 6.9 to 7.1 mW, press the

[ENTER/YES]

 button and save the adjustment result in the

nonvolatile memory.
(“LD SAVE $ 

” will be displayed for a moment.)

 Do not perform the emission with 7.0 mW more than 15 seconds

continuously.

7. Turn the 

[     

=

 

        SELECTOR      

+

 

        ]

 dial and display “LDPWR

CHECK”.

8. Press the 

[ENTER/YES]

 button and display “LD 0.9 mW $

”. Check that the reading of the laser power meter becomes

0.80 to 0.96 mW.

9. Press the 

[ENTER/YES]

 button and display “LD 7.0 mW $

”. Check that the reading of the laser power meter and digi-

tal voltmeter satisfy the specified value.

Specification:
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading : Optical pick-up displayed value

±10%

10. Press the 

[MENU/NO]

 button and display “LDPWR CHECK”,

and stop the laser emission.
(The 

[MENU/NO]

 button is effective at all times to stop the

laser emission.)

Optical pick-up

objective lens

laser
power meter

+
–

BD board

digital voltmeter

TP29 (IOP +)
TP30 (IOP –)

KMS260A

27X40
B0567

lOP=56.7 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (

Ω

)

(Optical pick-up label)