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– 25 –

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

– 26 –

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

– 27 –

Save the temperature data at that time in the non-volatile memory
as 25 °C reference data.

1.

Usually, do not perform this adjustment.

2.

Perform this adjustment in an ambient temperature of 22 °C to 28 °C.
Perform it immediately after the power is turned on when the internal
temperature of the unit is the same as the ambient temperature of 22 °C
to 28 °C.

3.

When D101 has been replaced, perform this adjustment after the tem-
perature of this part has become the ambient temperature.

Adjusting Procedure:
1. Press the  u  (MD) or  x  (MD) button to display “TEMP

ADJUST”.

2. Press the [RADIO/BAND] button to select the “TEMP ADJUST”

mode.

3. “TEMP = 

” and the current temperature data will be displayed.

4. To save the data, press the [RADIO/BAND] button.

When not saving the data, press the [REC/REC MODE] button.

5. When the [RADIO/BAND] button is pressed, “TEMP = 

 SAVE”

will be displayed and turned back to “TEMP ADJUST” display
then. When the [REC/REC  MODE] button is pressed, “TEMP
ADJUST” will be displayed immediately.

Specified Value:
The “TEMP = 

” should be within “E0 - EF”, “F0 - FF”, “00 -

0F”, “10 - 1F” and “20 - 2F”.

7. Then, press the  u  (MD) or  x  (MD) to display “LDPWR

CHECK”.

8. Press the [RADIO/BAND] button once to display “LD 0.9mW $

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

0.85 to 0.91 mW.

9. 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.
Note down the digital voltmeter reading value.

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

: Value on the optical pick-up label

± 10%

Adjusting 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

ADJUST”.
(Laser power: For adjustment)

3. Press the [RADIO/BAND] button once to display “LD 0.9 mW $

”.

4. Press the  u  (MD) or  x  (MD) button so that the reading of

the laser power meter becomes 0.85 to 0.91 mW. Press the
[RADIO/BAND] button after setting the range knob of the laser
power meter, and save the adjustment results. (“LD SAVE $

” will be displayed for a moment)

5. Then “LD 7.0 mW $ 

” will be displayed.

6. Press the  u  (MD) or  x  (MD) button and adjust so that the

reading on the laser power meter is 6.9 to 7.1 mV. Press the
[RADIO/BAND] button to save the setting.

Do not perform the emission with 7.0 mW more than 15 seconds
continuously.

10. 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 9, 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)

5

4

KMS260B

27X40
B0825

Ω

– 28 –

Data will be erased during MO reading if a recorded disc is
used in this adjustment.

If the traverse waveform is not clear, connect the oscilloscope
as shown in the following figure so that it can be seen more
clearly.

8. Press the  u  (MD) or  x  (MD) button so that the waveform

of the oscilloscope becomes the specified value.
(When the JOG dial is turned, the 

 of “EFB- 

” changes and

the waveform changes) In this adjustment, waveform varies at
intervals of approx. 2%. Adjust the waveform so that the speci-
fied value is satisfied as much as possible.
(Write power traverse adjustment)

Traverse Waveform

Adjusting Procedure:
1. Connect an oscilloscope to CN110 pin 3 (TEO) and CN110

pin 1 (VC) on the BD board.

2. Load a disc (any available on the market). (Refer to Note 1)
3. Press the  >  button to move the optical pick-up outside the

pit.

4. Press the  u  (MD) or  x  (MD) button to display “EFBAL

ADJUST”.

5. Press the [RADIO/BAND] button to display “EFB = 

 MO-R”.

(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)

6. Press the  u  (MD) or  x  (MD) button so that the waveform

of the oscilloscope becomes the specified value.
(When the  u  (MD) or  x  (MD) button is pressed, the 

 of

“EFB = 

” changes and the waveform changes ) In this adjust-

ment, waveform varies at intervals of approx. 2 %. Adjust the
waveform so that the specified value is satisfied as much as
possible.
(Read power traverse adjustment)

Traverse Waveform

Ω

3

1

3

1

7. Press the [RADIO/BAND] button and save the result of adjust-

ment to the non-volatile memory. (“EFB = 

 SAVE” will be

displayed for a moment. Then “EFB = 

 MO-W” will be dis-

played)

9. Press the [RADIO/BAND] button, and save the adjustment re-

sults in the non-volatile memory. (“EFB = 

 SAVE” will be

displayed for a moment)

10.  “EFB = 

 MO-P” will be displayed.

The optical pick-up moves to the pit area automatically and
servo is imposed.

11. Press the  u  (MD) or  x  (MD) button until the waveform of

the oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

Traverse Waveform

12. Press the [RADIO/BAND] button, and save the adjustment re-

sults in the non-volatile memory. (“EFB = 

 SABE” will be

displayed for a moment)
Next “EFBAL ADJUST” is displayed. The disc stops rotating
automatically.

13. Press the  Z  (MD) button and take out the disc.
14. Load the check disc (MD) TDYS-1.
15. Press the [RADIO/BAND] button to display “EFB = 

 CD”. Servo

is imposed automatically.

16. Turn the JOG dial so that the waveform of the oscilloscope

moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

Traverse Waveform