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5

The laser diode in the optical pick-up block may suffer electrostatic
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.

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 °C higher

than ordinary solder.

Ordinary soldering irons can be used but the iron tip has to be

applied to the solder joint for a slightly longer time.

Soldering irons using a temperature regulator should be set to

about 350 

°C.

Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscou-s (sticky, less prone to flow)

than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may

also be added to ordinary solder.

The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.

Releasing Procedure :
Press two buttons of

A

and

x

simultaneously for five seconds.

The message “UNLOCKED” is displayed and the tray is unlocked.

When “LOCKED” is displayed, the tray lock is not released by turning
power on/off with the

I/

1

button.

When replacing the DMB07 board, since the adjustment value is
not set up correctly, “Drive Auto Adjustment” can’t be performed.
In this case, initialize Memory in the following procedures.

1. Set the test mode. (See page 15)
2. Press the [2] key of the remote commander, and set the “DRIVE

MANUAL OPERATION”. (See page 18)

3. Press the [6] key of the remote commander, and set the “2-6,

Memory Check”. (See page 20)

4. Press the [CLEAR] key of the remote commander, and initialize

Memory.

•

MODEL

PART No.

AEP, UK models

2-067-992-0[]

Korean model

2-067-992-1[]

Singapore model

2-067-992-2[]

Hong Kong model

2-067-992-3[]

Australian model

2-067-992-4[]

Russian model

2-067-992-5[]

PART No.

6

1. Connect an oscilloscope to test point 1  pin and 3  pin of

CN901 on the DMB07 board.

2. Turn the power on.
3. Put the disc (LUV-P01) (Part No.: 4-999-032-01) (CD) in to

playback.

4. Confirm that oscilloscope waveform is clear and check RF

signal level is correct or not.

5. Put the disc (TDV-520CSO) (Part No.: J-2501-236-A) (DVD)

is to playback.

6. Perform confirmation in the same manner as step 4.

A clear RF signal waveform means that the shape “

◊” can be clearly

distinguished at the center of the waveform.

DMB07 board

CN901 

1

 pin

CN901 

3

 pin

+
–

oscilloscope

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

CD: 1.05 

±

 0.2 Vp-p

DVD: 1.09 

±

 0.2 Vp-p

RF signal waveform

CN901

IC701

IC207

IC801

1

7

7

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