Sony MDS-NT1 service manual Precautions for Adjustments, Laser power meter

MDS-NT1

5-5. 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, exit the test mode. Perform the adjustments and checks in “group Service” of the test mode.

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

4.Use the following tools and measuring devices.

•Check Disc (MD) TDYS-1 (Part No. : 4-963-646-01)

•Test Disk (MDW-74/GA-1) (Part No. : 4-229-747-01)

•Laser power meter LPM-8001 (Part No. : J-2501-046-A) or

MD Laser power meter 8010S (Part No. : J-2501-145-A)*1

•Oscilloscope (Measure after performing CAL of prove)

•Digital voltmeter

•Thermometer

•Jig for checking BD board waveform (Part No. : J-2501-149-A)

•Attached software “OpenMG Jukebox” (Part No. : 4-237-880-01)

•Software for test mode

(Distributed together with the Service Manual)

•Attached USB cable (Part No. : 1-757-471-11)

•Personal computer (Refer to Servicing Notes)

5.When observing several signals on the oscilloscope, etc., make sure that VC and ground do not connect inside the oscil- loscope.

(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 Servicing Note on page 8)

7.As the disc used will affect the adjustment results, make sure that no dusts nor fingerprints are attached to it.

8.In normal operation check after the completion of adjustment, be sure to perform the recording check (check in, check out) using the software “OpenMG Jukebox” attached.

*1 Laser power meter

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 me- ter is convenient.

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

				Parts to be replaced
Adjustment	Optical	IC101	IC701	IC201	IC933	IC195*	D101
	Pick-up
7. Initial setting of adjustment value

8.Recording of Iop information

9.Temperature compensation offset adjustment

10.Laser power adjustment

11.Iop NV Save

12.Traverse adjustment

13.Focus bias adjustment

16.Auto gain adjustment 6-4. AUTO CHECK

*The IC195 cannot be replaced with a new part.

For detail refer to “Notes on Replacing BD Board or MD Mechanism Deck” (See page 7).

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