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5

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.

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 emis-
sion, observe from more than 30 cm away from the objective lens.

Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.

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)

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

supply.

6. When cleaning the objective lens of optical pick-up in CD,

refer to “HOLDER (BU) ASS’Y” on page 24 for removing
HOLDER (BU) ASS’Y.

PART No.

Model

Part No.

Hong Kong model

4-229-548-1[]

Korean model

4-232-128-0[]

Taiwan model

4-232-129-0[]

6

tray (CDM)

Move the cam block in the direction 
of arrow 

A

 with a finger.

A

CD mechanism deck

floating screw
(PTPWH M2.6)  

optical pick-up block

Clean the lens block 
with a cotton bud.

7

MD mechanism deck

CD  mechanism deck

MAIN board

POWER board

CN993

CN802

Extension cable (4P)
(J-2501-042-A)

Extension cable (3P)
(J-2501-045-A)

AMP board

8

• The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to

the customer.

Procedure:
1. Press the

I/1

button to turn the power on.

2. While pressing the 

[PLAY MODE/TUNING MODE]

 and

s

 (CD) buttons, press the

I/1

button.

3. The set is reset, and displays “COLD RESET”, then becomes standby status.

•

This mode resets the set with the preset data kept stored in the memory. The hot reset mode function is same as if the power cord is plugged
in and out.

Procedure:
1. Press the

I/1

button to turn the power on.

2. While pressing the 

[PLAY MODE/TUNING MODE]

 and

HS

(CD) buttons, press the

I/1

button.

3. The set is reset, and becomes standby state.

Procedure:
1. Press the

I/1

button to turn the power on.

2. While pressing the 

[PLAY MODE/TUNING MODE]

 and

A

(CD) buttons, press the

I/1

button.

3. LEDs and fluorescent indicator tube are all turned on.
4. Press the

HS

(MD) button to enter the key test mode, and display “Key0 Vol0”.

5. Each time a button is pressed, “Key” value increases. However, once a button is pressed, it is no longer taken into account.

“Vol” value increases like 0, 1, 2 ... if turn the 

[VOLUME]

 knob clockwise, or it decreases like 9, 8, 7 ... if turn the 

[VOLUME]

 knob

counterclockwise.

6. To release from this mode, press three buttons in the same manner as step 2, or disconnect the power cord.

l m

and

M L

buttons are no longer taken into account, if it pressed within for a second.

• The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the

I/1

button to turn the power on.

2. Press the 

[FUNCTION]

 button to set the TUNER function, and press the 

[TUNER/BAND]

 button to select the band “AM”.

3. Press the

I/1

button to turn the power off.

4. When the power off, press the

I/1

button while pressing the 

[PLAY MODE/TUNING MODE]

 button, and the display of fluorescent

indicator tube changes to “AM 9k STEP” or “AM 10k STEP”, and thus the tuning interval is changed over.