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The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown 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, ob-
serve more than 30 cm away from the  objective lens.

1. Close the lid for CD.
2. Press CD 

fl button.

3. Confirm the laser diode emission while observing the objecting

lens. When there is no emission, Auto Power Control circuit or
Optical Pick-up is broken.
Objective lens moves up and down once for the focus search.

Make the following adjustment when mounting the CD door motor
(part number : 1-763-224-11) and motor pulley (part number : 2-
627-174-01) of the CD section.

Specification :   A = 0.9 to 1.1mm

!

!

• Keep the temperature of the soldering iron around 270°C during

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.

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

aged by heat.

On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.
• Code number of Chuck Plate Jig : X-4918-255-1

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The special jig (J-2501-124-A) is highly convenient when check-
ing the waveform of the BD board of the MD section. Pin names
and items to check are as follows:

I+3V : for IOP measurement (check for depleted optical pickup

laser)

IOP

: for IOP measurement (check for depleted optical pickup

laser)

TEO : TRK error signal (traverse adjustment)
VC

: Standard level for checking signals

RF

: RF signal (jitter check)

BD board

CN110

DG board

I + 3V

IOP

TEO

VC

RF

Jig

(J-2501-124-A)

MD block section

It is possible to reset the system microcomputer by pressing the
RESET button located on the bottom with a pointed object. Use
this button when the unit cannot be operated properly due to such
problems as microcomputer errors, etc.

RESET button

(Located on the bottom)

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1 MD operation buttons

fl (play/pause)
π (stop)

2 BAND button
3 CD operation buttons

fl (play/pause)
π (stop)

4 CD lid
5 6 CD OPEN/CLOSE button
6 6 MD EJECT button
7 MONO/ST, REPEAT button
8 AUTO PRESET/RDS/SHUF/PGM button
9 TUNE +, ÷, ) button

!º YES, ENTER button
!¡ Jog dial

=/+ AMS
PRESET

!™ NO, CANCEL button
!£ TUNE –, ¿, 0 button
!¢ EDIT button
!∞ REC button
!§ REC IT button

TO TOP, TO END

!¶ SYNCHRO REC

CD 

” MD button

!• MD insert section

!ª LINE/LINE LEVEL button
@º Display window
@¡ VOLUME +, – buttons
@™ BASS/TREBLE button
@£ MEGA BASS button
@¢ Jog dial Function indicator

AMS/PRESET SELECT

@∞ LINE IN terminal

@§ DISPLAY button
@¶ INSERT/TIMER button
@• DELETE/CLOCK button
@ª 2 (Headphones) Jack (stereo mini jack)
#º STANDBY button
#¡ SLEEP button
#™ Remote control receiver section
#£ OPERATE button

– 6 –

1 TA SERCH button
2 CD OPEN/CLOSE button
3 Numeric buttons
4 MODE button
5 BASS/TREBLE +, – buttons
6 MEGA BASS button
7 MD operation buttons

      

” (play)

      

P (pause)

      

p (stop)

      

r (rec)

8 CD operation buttons

      

” (play)

      

P (pause)

      

p (stop)

9 RADIO operation buttons

      BAND

      TUNE –, +
!º OPERATE button
!¡ VOL +, – buttons
!™ =, + AMS, select, search buttons

#¢ MW/LW ANTENNA terminal
#∞ FM EXT ANTENNA terminal
#§ FM rod antenna
#¶ ⁄  AC IN jack
#• Battery compartment (for memory back-up)
#ª RESET button (bottom)
$º FM ANTENNA SELECTOR switch