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6

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

The laser  component in this product
is capable of emitting radiation
exceeding  the limit for Class  1.

This appliance is classified as a CLASS 1
LASER  product.  The CLASS  1 LASER
PRODUCT MARKING is located on the
bottom exterior.

0

0

7

The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.

• In cleaning the objective lens of optical pick-up, be sure the

following below.

1. In cleaning the lens, do not apply an excessive force.

As the optical pick-up is vulnerable, application of excessive
force could damage the lens holder.

2. In cleaning, do not use a cleaner other than exclusive cleaning

liquid (KK-91 or isopropyl alcohol).

3. Wipe the objective lens spirally from center toward outside.

(See Figure A)

In replacing the BD board or MD mechanism deck, perform the
work through the steps provided below:

1. Remove the IC195 from the BD board to be replaced.
2. Remove the IC195 from new BD board.
3. Mount the IC195 on new BD board, which was removed from

the BD board to be replaced.

4. Install new BD board in the set.

The IC195 cannot be replaced with a new part. If IC195 is faulty,
replace the entire BD board.

IC195

4. Eject the disc, if loaded.
5. Disconnect the power cord from the socket to shut off the power

supply.

The set alone is capable of performing the play function only. In
checking the recording and other functions, connect the set to the
PC with a USB cable and perform the operation on the application
software “OpenMG Jukebox” attached.

8

I+3V
Iop
GND
TE
FE
VC
RF

I+3V

Iop

GND

TE
FE

VC

RF

1

7

for

MDM-7S2B

The special jig (J-2501-149-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.

GND : Ground
I+3V : For measuring Iop (Check the deterioration of the optical pick-up laser)
Iop

: For measuring Iop (Check the deterioration of the optical pick-up laser)

TE

: Tracking error signal (Traverse adjustment)

VC

: Reference level for checking the signal

RF

: RF signal (Check jitter)

FE

: Focus error signal

9

The Iop value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need
to look at the value on the optical pick-up label. When replacing the optical pick-up or non-volatile memory (IC195 of BD board), record
the Iop value on the optical pick-up according to the following procedure.

Record Procedure:
1. Press the 

[             ]

 button and 

[         ]

 button until the NetMD indicator turns off (for more than 3 seconds). (During this step, the USB

cable must be disconnected)

2. Connect the set to the PC with the attached USB cable.
3. Start up the software for test mode.
4. Click the 

[TEST MODE]

.

5. Click the 

[JOG UP]

 or 

[JOG DOWN]

 to display “[Service]”, and click the 

[ENTER/YES]

.

6. Click the 

[JOG UP]

 or 

[JOG DOWN]

 to display “Iop Write” (C05), and click the 

[ENTER/YES]

.

7. The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
8. Input the Iop value written on the optical pick-up label.

To select the number : Click the 

[JOG UP]

 or 

[JOG DOWN]

.

To select the digit

: Click the 

[PUSH]

.

9. When the 

[ENTER/YES]

 is clicked, the display becomes “Measu=@@@.@” (@ is an arbitrary number).

10. As the adjustment results are recorded for the 6 value. Leave it as it is and click the 

[PUSH]

.

11. “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop

Write (C05)”.

12. Quit the software for test mode after the 

[REPEAT]

 clicked.

When retrying this operation start from step1.

Display Procedure:
1. Press the 

[             ]

 button and 

[         ]

 button until the NetMD indicator turns off (for more than 3 seconds). (During this step, the USB

cable must be disconnected)

2. Connect the set to the PC with the attached USB cable.
3. Start up the software for test mode.
4. Click the 

[TEST MODE]

.

5. Click the 

[JOG UP]

 or 

[JOG DOWN]

 to display “[Service]”, and click the 

[ENTER/YES]

.

6. Click the 

[JOG UP]

 or 

[JOG DOWN]

 to display “Iop Read” (C26), and click the 

[ENTER/YES]

.

7. “@@.@/##.#” is displayed and the recorded contents are displayed.

@@.@ : indicates the Iop value on the optical pick-up label.
##.#

: indicates the Iop value after adjustment

8. To end, click the 

[PUSH]

 and 

[MENU/NO]

 to display “Iop Read” (C26).

9. Quit the software for test mode after the 

[REPEAT]

 clicked.

When retrying this operation start from step1.

The test mode and recording of this set are controlled by a personal computer, thus requiring the set to be connected to the PC.
Prepare the personal computer in which necessary software is already installed.
• Attached software “OpenMG Jukebox” (necessary for recording (check in, check out)) (Part No. : 4-237-880-01)
• Software for test mode “TestMode_S.exe”  (“TestMode_S.exe” and essential files “data_files.csv”,  “Net MDUSB.dil” are distributed to-

gether with the Service Manual. For the test mode, copy these three files in the same folder beforehand)

In the operation in the test mode, the operational description requiring “click 

[xxx]

” means that you have to click the button on the screen.

(“xxx” indicates the button name)

B/>

x/Z

B/>

x/Z