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36

This test mode performs CREC and CPLAY automatically for mainly checking the characteristics of the optical pick-up.
To perform this test mode, the laser power must first be checked.
Perform AUTO CHECK after the laser power check and Iop Compare.

Procedure:
1. Press the

.

 “R”

or

>

 “R”

button to display “AUTO CHECK” (C01).

2. Press the

ENTER/YES “R”

button. If “LDPWR 

 ” is displayed, it means that the laser power check has not been performed. In

this case, perform the laser power check and Iop Compare, and then repeat from enter the MD test mode.

3. If a disc is in the mechanical deck, it will be ejected forcibly.

“DISC IN” will be displayed in this case. Load a test disc (MDW-74/GA-1) which can be recorded.

4. If a disc is loaded at step 3, the check will start automatically.
5. When “XX CHECK” is displayed, the item corresponding to XX will be performed.

When “06 CHECK” completes, the disc loaded at step 3 will be ejected. “DISC IN” will be displayed. Load the check disc (TDYS-1).

6. When the disc is loaded in step 5, the check will automatically be resumed from “07 CHECK”.
7. After completing to test item 12, check OK or NG will be displayed. If all items are OK, “CHECK ALL OK” will be displayed. If any item

is NG, it will be displayed as “NG:xxxx”.

When “CHECK ALL OK” is displayed, it means that the optical pick-up is normal. Check the operations of other parts (spindle motor,
sled motor, etc.).
When displayed as “NG:xxxx”, it means that the optical pick-up is faulty. In this case, replace the optical pick-up.

Display the software version.

Procedure:
1. Press the

.

 “R”

or

>

 “R”

button to display “INFORMATION” (C31).

2. Press the

ENTER/YES “R”

button.

3. The software version will be displayed.
4. Press the

MENU/NO “R”

button to end this mode.

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