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41

After parts related to the servo circuit (RF amplifier (IC001), DSP
(IC509), motor driver (IC501), EEPROM (IC903) so on) are
replaced, re-adjusting the servo circuit is necessary. Select “ALL”
at  “1. DRIVE AUTO ADJUSTMENT” (Refer to page 30  in TEST
MODE) and adjust DVD-SL (single layer), CD and DVD-DL (dual
layer).

Use the following test disc on test mode.
TDV-520CSO (DVD-SL):

PART No. J-2501-236-A

LUV-P01 (CD):

PART No. 4-999-032-01

TDV-540C (DVD-DL):

PART No. J-2501-235-A

Do not use exiting test disc for DVD.

+
–

SUB board

oscilloscope

CN110 pin

 1

(RF)

CN110 pin 

3

(GND)

1. Connect an oscilloscope to CN110 pin 1 (RF) and CN110

pin 3 (GND) on the SUB board.

2. Turn the power on.
3. Set the test disc (DVD: TDV-520CSO, CD: LUV-P01) on the

tray and press NX  (DVD) button to playback.

4. Confirm that oscilloscope waveform is clear and check

RFMON signal level is correct or not.

A clear RFMON signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

RFMON signal waveform

 

VOLT/DIV: 200 mV

TIME/DIV: 500 ns 

level: 1.09 

±

  0.2 Vp-p (DVD)

1.05 

±

 0.2 Vp-p (CD)

CN111

CN110

1

3

CN110 pin

 1

(RF)

CN110 pin

 3

(GND)

(Conductor Side)

Checking Location: SUB board (Conductor Side)

42

If malfunctions caused by optical pick-up such as sound skipping are suspected, follow the following check.

Other faults are suspected.
Check the mechanism parts (spindle motor, sled motor, etc.).

Start

NG

NG

NG

OK

OK

OK

Laser Power Check

6-2.

(See page 45)

6-3.

(See page 45)

6-4.

(See page 46)

Iop Compare

Auto Check

Replace optical pick-up or MDM-7S2D

43

YES

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

Start

IC195 replacement

OP or IC195 replacement

IC101, IC195 or D101 

replacement

OP or IC195 

replacement

After turning the power off and on, initialises the non-volatile 
memory (EEPROM).

7. Initial setting of adjustment value (See page 48)

9. Temperature compensation offset adjustment (See page 48)

10. Laser power adjustment (See page 48)

OP, IC701 or IC195 

replacement

OP, IC101, IC201 or IC195 

replacement

OP replacement

Spindle motor replacement

6-4. Auto check (See page 46)

End

11. Iop NV save (See page 49)

12.Traverse adjustment (See page 49)
13. Focus bias adjustment (See page 50)
16. Auto gain control output level adjustment (See page 51)

In Err display mode, write OP change Iop

In Err display mode, Spdl change

•Abbreviation
OP: Optical pick-up

44

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 handling
it.
Before disconnecting the connector, perform soldering bridge to
the laser tap. Before connecting the 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.

1. When replacing the following parts, perform the adjustments

and checks with 

 in the order shown in the following table.

2. Set the MD test mode when performing adjustments.

After completing the adjustments, exit the MD test mode.
Perform the adjustments and checks in “Group Service” of
the MD test mode.

3. Perform the adjustments to be needed in the order shown.
4. Use the following tools and measuring devices.
•

Check Disc (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-2501-196-A)

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

without the need to solder.
(Refer to Servicing Notes on page 14)

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

that no dusts nor fingerprints are attached to it.

*

1

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

pick-up

flexible board

laser tap

Before starting adjustment:
The adjustment value differs depending on the types (KMS-262A
or KMS-262E) of optical pickup. Be sure to confirm the type name
before starting adjustment.

pink

: KMS-262A

white : KMS-262E

UV adhesive = 

UV adhesive 

Optical pick-up
(KMS-262A/262E)

6-4. AUTO CHECK

a

a

✕

a

a

a

✕

7. Initial setting of adjustment value

a

✕

✕

✕

✕

a

✕

8. Recording of Iop information

a

✕

✕

✕

✕

a

✕

9. Temperature compensation

✕

a

✕

✕

✕

a

a

    offset adjustment

10. Laser power adjustment

a

✕

✕

✕

a

a

✕

11. Iop NV Save

a

✕

a

✕

a

a

✕

12. Traverse adjustment

a

a

✕

a

✕

a

✕

13. Focus bias adjustment

a

a

✕

a

✕

a

✕

16. Auto gain adjustment

a

a

✕

a

✕

a

✕