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– 25 –

(COMPONENT SIDE)

– 26 –

• Laser power check
• Focus bias check
• C PLAY check
• Self-recording/playback check

Parts Replacement and Repair

NG

Has the OWH been replaced?

NO

OK

NO

NO

NO

Has OP, IC171, IC101, or 
IC121 been replaced?

YES

YES

Initial setting of the adjustment value

Has OP or IC171 been replaced?

YES

IOP information recording
(IOP value labeled on OP)

Has IC171 or D101 
been replaced?

YES

Temperature compensation offset adjustment

• Laser power adjustment
• Traverse adjustment
• Focus bias adjustment
• Error rate adjustment
• Focus bias check
• Auto gain adjustment

Check the sled and spindle 
mechanisms. 
Other causes can be suspected.

• Check and adjust the mechanism deck as follows.

The procedure changes according to the part replaced.

• Abbreviation

OP

: Optical pick-up

OWH : Overwrite head

– 27 –

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-
ing 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.

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
• Jig for checking BD board waveform

(Part No. : J-2501-149-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 with-

out the need to solder.
(Refer to Servicing Notes on page 5)

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.

* 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. Press the  u  (MD) or  x  (MD) button to display “CREC

MODE”.

3. Press the 

[RADIO/BAND] button again to display “CREC MID”.

Display “CREC (0300)” and start to recording.

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

[REC/REC MODE] 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.

• Be careful not to apply vibration during continuous recording.

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.

1.Temperature

compensation
offset adjustment

2.Laser power

adjustment

3.EF balance

adjustment

4.Focus bias

adjustment

5.Error rate check

Optical

Pick-up

BD Board

IC171

D101

IC101, IC121

IC192

– 28 –

These checks are performed before replacing parts according to
“approximate specifications” to determine the faulty locations. For
details, refer to “Checks Prior to Parts Replacement and Adjust-
ments” (See page 6).

Change the focus bias and check the focus tolerance amount.
Checking Procedure:
1. Load the test disc (MDW-74/AU-1).
2. Press the  u  (MD) or  x  (MD) button to display “CPLAY

MODE”.

3. Press the 

[RADIO/BAND] button twice to display “CPLAY MID”.

4. Press the 

[REC/REC MODE] button when “C1 = 

 AD = 

”

is displayed.

5. Turn the JOG dial to display “FBIAS CHECK”.
6. Press the 

[RADIO/BAND] button to display “

/

 c = 

”.

The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is below 2.

7. Press the 

[RADIO/BAND] button to display “

/

 b = 

”.

Check that the C1 error is about 200 and ADER is below 2.

8. Press the 

[RADIO/BAND] button to display “

/

 a = 

”.

Check that the C1 error is about 200 and ADER is below 2.

9. Press the 

[REC/REC MODE] button, then press the  Z  (MD)

button and take out the test disc.

Checking Procedure:
1. Load the test disc (MDW-74/AU-1).
2. Press the  u  (MD) or  x  (MD) button to display “CPLAY

MODE”.

3. Press the 

[RADIO/BAND] button to display “CPLAY MID”.

4. The display changes to “C1 = 

 AD = 

”.

5. If the C1 error rate is below 80, check that ADER is below 2.
6. Press the 

[REC/REC MODE] button to stop playback, then press

the  Z  (MD) button and take out the test disc.

Checking Procedure:
1. Load the check disc (MD) TDYS-1.
2. Press the  u  (MD) or  x  (MD) button to display “CPLAY

MODE”.

3. Press the 

[RADIO/BAND] button twice to display “CPLAY MID”.

4. The display changes to “C1 = 

 AD = 

”.

5. Check that the C1 error rate is below 50.
6. Press the 

[REC/REC MODE] button to stop playback, then press

the  Z  (MD) button and take out the check disc.

Prepare a continuous recording disc using the unit to be repaired
and check the error rate.

Checking Procedure:
1. Load a recordable disc (blank disc).
2. Press the  u  (MD) or  x  (MD) button to display “CREC

MODE”.

3. Press the 

[RADIO/BAND] button to display “CREC MID”.

4. When recording starts, lights up “

[REC]” and display “CREC

@@@@” (@@@@ is the address).

5. About 1 minute later, press the 

[REC/REC MODE] button to stop

continuous recording.

6. Turn the JOG dial to display “CPLAY MODE”.
7. Press the 

[RADIO/BAND] button to display “CPLAY MID”.

8. “C1 = 

 AD = 

” will be displayed.

9. Check that the C1 error becomes below 80 and the ADER be-

low 2.

10. Press the 

[REC/REC MODE] button to stop play back, then press

the  Z  (MD) button and take out the disc.

After the TEST MODE is entered, insert the disc.

Checking Procedure:
1. Set the laser power meter on the objective lens of the optical

pick-up. (When it cannot be set properly, press the  .  but-
ton or  >  button to move the optical pick-up)
Connect the digital voltmeter to CN110 pin 5 (I+3 V) and
CN110 pin 4 (IOP) on the BD board.

2. Press the  u  (MD) or  x  (MD) button to display “LDPWR

CHECK”.

3. Press the 

[RADIO/BAND] button once to display “LD 0.9 mW $

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

0.84 to 0.92 mW.

4. Press the 

[RADIO/BAND] button once more to display “LD 7.0

mW $ 

”. Check that the reading the laser power meter and

digital voltmeter satisfy the specified value.

Specified Value:
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading

: Value on the optical pick-up label

± 10 %

5

4

5. Press the 

[REC/REC MODE] button to display “LDPWR CHECK”

and stop the laser emission.
(The 

[REC/REC MODE] button is effective at all times to stop

the laser emission)

After step 4, each time the 

[RADIO/BAND] button is pressed, the

display will be switched “LD 0.7 mW $ 

”, “LD 6.2 mW $ 

”,

and “LD WP 

 $ 

”. Nothing needs to be performed here.

(

 = correction)

KMS260B

27X40
B0825

Ω