ZS-M30 - Sony Audio Service Manual (repair manual). Page 20

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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 eye-sight.

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 connect-
ingthe connector, be careful not to remove the solder. Also take
adequate measures to prevent damage by static electricity. Handle
the flexible board with care as it breaks easily.

4. PRECAUTIONS FOR ADJUSTMENTS
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, release the test mode.
Perform the adjustments and checks in “group S” of the test
mode.

3. Perform the adjustments to be needed in the order shown.

4. Use the following tools and measuring device.

• Check Disc (MD) TDYS-1

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

• Test Disc (MDW-74/AU-1) (Part No. 8-892-341-41)
• Laser power meter LPM-8001 (Part No. J-2501-046-A)

or MD Laser power meter 8010S (Part No. J-2501-145-A)

• Oscilloscope (Measure after performing 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 oscilloscope.
(VC and ground will become short-circuited)

6. Using the above jig enables the waveform to be checked with-out

the need to solder.
(Refer to Service Note on page 3)

7. As the disc used will affect the adjustment results, make sure

that not dusts nor fingerprints are attached to it.

When performing laser power checks and adjustment (electrical
adjustment), use of the new MD laser power meter 8010S (Part No.
J-2501-145-A) instead of the conventional laser power meter is con-

venient.

It sharply reduces the time and trouble to set the laser power meter
sensor onto the objective lens of optical pick-up.

5. CREATING CONTINUOUSLY-RECORDED DISC
* This disc is used in focus bias adjustment and error rate check.

The following describes how to create a continuous recording
disc.

1. Insert a disc (blank disc) commercially available.
2. Turn the JOG dial to display “CREC MODE”.
3. Press the  YES/ENTER  button again to display “CREC MID”.
Display “CREC (0300)” and start to recording.
4. Complete recording within 5 minutes.
5. Press the NO/CANCEL button and stop recording.
6. Press the  Z  (MD) button and remove the disc.
The above has been how to create a continuous recorded data for
the focus bias adjustment/check and MO error rate check.
Note:
• Be careful not to apply vibration during continuous recording.

flexible board

laser tap

pick- up

Optical pick-up flexible board

2.Temperature

compensation
offset adjustment

1. Recording of IOP

information
(Value written in
the pick-up)

3.Laser power

adjustment

4.EF balance

adjustment

5.Focus bias

adjustment

6.Error rate check

Optical

Pick-up

BD Board

IC603

D501

IC502, IC504

IC506