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37

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 40)

6-3.

(See page 40)

6-4.

(See page 41)

Iop Compare

Auto Check

Replace optical pick-up or MDM-7X2A

About “R”
As this unit has only a few buttons, some operations require the use of remote commander (RM-S55EN/provided with unit: 1-476-664-21)
buttons. These operations are indicated as “R” in this manual.
Example:

MENU/NO “R”

...Press the 

[MENU/NO]

 button of the remote commander.

Incorrect operations may be performed if the MD test mode is not entered properly.
In this case, press the

?/1

button to turn the power off, and retry to enter the MD test mode.

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

38

6-4. Auto Check
(See page 41)

Start

YES

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

Replace IC195

Replace OP or IC195

Replace IC101, IC195, or D101

11. Iop NV SAVE (See page 44)

Replace OP, IC190, or IC195

Replace OP, IC102, IC190, 

or IC195

Replace OP, IC101, IC151, 

or IC195

Replace OP

Replace the spindle motor

End adjustments

After turning off and then on the power, 
initialize the EEPROM
For details, refer to “WHEN MEMORY NG IS DIS- 
PLAYED” in 1. SERVICING NOTES (See page 10)

• Abbreviation

OP: optical pick-up

7. INITIAL SETTING OF ADJUSTMENT VALUE 

(See page 43)

9. TEMPERATURE COMPENSATION OFFSET 

ADJUSTMENT (See page 43)

10. LASER POWER ADJUSTMENT (See page 43)

12. TRAVERSE ADJUSTMENT (See page 44)
13. FOCUS BIAS ADJUSTMENT (See page 45)
16. AUTO GAIN CONTROL OUTPUT LEVEL

ADJUSTMENT (See page 46)

“op change” in SELF-DIAGNOSIS FUNCTION
(ITEMS OF ERROR HISTORY MODE ITEMS 
AND CONTENTS) (See page 3)
8. RECORDING AND DISPLAYING THE IOP 

INFORMATION  (See page 43)

“spdl change” in SELF-DIAGNOSIS FUNCTION
(ITEMS OF ERROR HISTORY MODE ITEMS
AND CONTENTS) (See page 3)

39

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 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.
•

Extension jig (27 core) (Part No. : J-2501-100-A)
CN102 on the BD (MD) board to CN1003 on the MD DIGITAL
board
Extension jig (17 core) (Part No. : J-2501-198-A)
CN103 on the BD (MD) board to CN1004 on the MD DIGITAL
board

•

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

pick-up

flexible board

laser tap

• Oscilloscope (Measure after performing CAL of prove.)
• Digital voltmeter
• Thermometer
• Jig for checking BD (MD) 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 9.)

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.

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

Optical

Pick-up

IC101

IC102

IC151

IC190

IC195

D101

Parts to be replaced

Adjustment

40

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 Adjustments
in MD” (see page 11).

When performing adjustments, set the internal temperature and room
temperature to 22 to 28ºC.

Procedure:
1. Press the

. 

“R”

or

> 

“R”

button to display “TEMP

CHECK” (C12).

2. Press the

ENTER/YES “R”

button.

3. “T=@@(##) [OK]” should be displayed. If “T=@@ (##) [NG]”

is displayed, it means that the results are bad.
(@@ indicates the current value set, and ## indicates the value
written in the non-volatile memory.)

Before starting adjustment;
The laser power adjustment value changes depending upon the types
of the optical pick-up (KMS-262A or KMS-262E).
Check the type of the optical pick-up before starting adjustment.
(See the illustrations “The method of ideutifying the optical pick-
up” on page 44
Before checking, check the Iop value of the optical pick-up.
(Refer to 8. Recording and Displaying the Iop Information (see page
43)

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

pick-up. (When it cannot be set properly, press the  m

 “R”

  button

or  M

“R”

  button to move the optical pick-up.)

Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (IOP).

2. Then, press the

.

“R”

or

>

“R”

button and display

“LDPWR CHECK” (C13).

3. Press the

ENTER/YES  “R”

button once and display “LD

0.9mW$

”. Check that the reading of the laser power meter

becomes specified value.

4. Press the

ENTER/YES “R”

button once more and display “ LD

8.4mW$

”. Check that the reading the laser power meter and

digital volt meter satisfy the specified value.

Specified Value:
Laser power meter reading :

Digital voltmeter reading : Optical pick-up displayed value ± 10%

5. Press the

MENU/NO “R”

button and display “LDPWR CHECK”

(C13) and stop the laser emission.
(The

MENU/NO “R”

button is effective at all times to stop the

laser emission.)

After step 4, each time the

ENTER/YES “R”

button is pressed, the

display will be switched to “LD 0.7W$

”and “LD 7.5mW$

”

“LD WP 

 $

”. Nothing needs to be performed here.

Checking Location: BD (MD) board (see page 47)

The current Iop value at laser power 8.4 mW output and reference
Iop value (set at shipment) written in the nonvolatile memory are
compared, and the rate of increase/decrease will be displayed in
percentage.

Perform this function with the optical pick-up set at room tempera-
ture.

Procedure:
1. Press the

.

“R”

or

>

 “R”

button to display “Iop Compare”

(C27).

2. Press the

ENTER/YES “R”

button and start measurements.

3. When measurements complete, the display changes to “± xx%

yy”.
xx is the percentage of increase/decrease, and OK or NG is
displayed at yy to indicate whether the percentage of increase/
decrease is within the allowable range.

4. Press the

MENU/NO “R”

button to end.

* 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

. 

“R”

or

>

  “R”

button and display “CREC  2MODE”

(C37).

3. Press the

ENTER/YES  “R”

button again to display “CREC 2

MID”.
Display “CREC 2(0300” and start to recording.

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

MENU/NO “R”

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 and error rate check.

 Be careful not to apply vibration during continuous recording.

Optical pick-up
objective lens

laser
power meter

+
–

BD (MD) board

digital voltmeter

CN105 pin 

1

 (I+3V)

CN105 pin 

2

 (IOP)

KMS262A

20101

B0825

lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (

Ω

)

(Optical pick-up label)

For details of the method for
checking this value, refer to 
“8. Recording and Displaying
the Iop Information”

SPECIFIED VALUE

KMS-262A
KMS-262E

0.84 to 0.92 mW
0.90 to 0.96 mW

KMS-262A
KMS-262E

8.4 ± 0.3 mW
8.65 ± 0.25 mW