DHC-EX880MD, DHC-MD717, MDS-EX880, MDS-MS717 - Sony Audio Service Manual (repair manual). Page 14

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To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eyesight.

As the laser diode in the optical pick-up is easily damaged by static
electricity, solder the laser tap of the flexible board when using it.
Before disconnecting the connector, desolder first.  Before con-
necting the connector, be careful not to remove the solder.  Also
tale adequate measures to prevent damage by static electricity.
Handle the flexible board with care as it breaks easily.

Optical pick-up flexible board

1) When replacing the following parts, perform the adjustments

and checks with 

® in the order shown in the following table.

2) Set the test mode when performing adjustments.

After completing the adjustments, exit the test mode.

3) Perform the adjustments in the order shown.
4) Use the following tools and measuring devices.

• Test disc (CD for playback only) TDYS-1

(Parts No. 4-963-646-01)

• Laser power meter LPM-8001

(Parts No. J-2501-046-A)

• Oscilloscope (Measure after preforming CAL of prove.)
• Digital voltmeter
• Thermometer

5) When observing several signals on the oscilloscope, etc., make

sure that VC and ground do not connect inside the oscillo-
scope.
(VC and ground will become short-circuited)

* This disc is used in focus bias adjustment and error rate check.

The following describes how to create a MO continuous record-
ing disc.

1. Insert a MO disc (blank disc) commercially available to slot 1.
2. Turn the 

[     

=

 

        SELECTOR      

+

 

        ]

 dial and display “CREC

MODE”.

3. Press the 

[ENTER/YES]

 button and display “CREC MID”.

“CREC (0300)” is displayed for a moment and recording starts.

4. Complete recording within 5 minutes.
5. Press the 

[MENU/NO]

 button and stop recording.

6. Press the

§ button and remove the MO disc.

(To exit from the TEST mode, press the 

[REPEAT]

 button.)

The above has been how to create a continuous recording data for
the focus bias adjustment and error rate check.

Be careful not to apply vibration during continuous recording.

Pick-up

Laser tap

Flexible board

Optical

BD board

Pick-up

IC171

D101

IC101, IC121, IC192

1. Temperature

compensation

×

®

®

®

offset adjustment

2. Laser power

®

®

×

®

adjustment

3. Traverse

®

®

×

®

adjustment

4. Focus bias

®

®

×

®

adjustment

5. Error rate check

®

®

×

®