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5

Follow the disassembly procedure in the numerical order given.

5

 two claws

2

 

cosmetics plate

1

 

The cosmetics plate is removed in the direction of the arrow.

    (Damage attention of four claws of cosmetics plate)

4

 

two screws (1.4)

6

 

front cabinet

3

 two adhesive sheets (plate, cosme)

two claws

cosmetics plate

two adhesive sheets (plate, cosme)

two claws

5

 two claws

6

Procedure 1: In HOLD state, while pushing  Nx  button, set a

dry battery.
When the test mode is set, the LCD display appears
as shown below.

Procedure 2: After starting up test mode, the following contents

can be checked. (Before key input, select the 
from HOLD state with S706.)

•   Nx  button
   The KEY test mode is activated. All key inputs are completed,
     then  Nx    button is pressed, restart. (Be aware that the
    initialization is included on all key input.)
•  [MENU] button
    EL0: ON/OFF   EL back lights on/off.
•   + >  button
    Ports: ON   EL back lights on.
•   . –  button
    Ports: OFF   EL back lights off.
•   + >  button (

 state with S706)

    All LCD lights on.
•   . –  button (

 state with S706)

    All LCD lights off.
•  [VOLUME +] button
    BEEP turns on.
•  [VOLUME --] button
    BEEP turns off.
•  [  REPEAT       SOUND] button
    Initialized. (Turns to the factory preset state, time, volume setting
   and so on.)
   The music data, files and so on in the memory are not changed.

•

512M   1.00.00   J11

7

Note on Schematic Diagram:
• All capacitors are in 

µ

F unless otherwise noted. (p: pF) 50 WV

or less are not indicated except for electrolytics and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise speci-

fied.

•

%

: indicates tolerance.

•

C

: panel designation.

•

: B+ Line.

• Power voltage is dc 1.5 V and fed with regulated dc power sup-

ply from battery terminal.

• Voltages and waveforms are dc with respect to ground under

no-signal (detuned) conditions.
no mark : PLAY
      

*

 : Impossible to measure

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal production toler-
ances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal production toler-
ances.

• Circled numbers refer to waveforms.

• Signal path.

E

: PLAY BACK

a

: DIGITAL OUT

k

: DIGITAL IN

Note on Printed Wiring Board
•  

X

: parts extracted from the component side.

•  

Y

: parts extracted from the conductor side.

•  

: Pattern from the side which enables seeing.

Caution:
Pattern face side: Parts on the pattern face side seen from
(Side A)

the pattern face are indicated.

Parts face side:

Parts on the parts face side seen from

(Side B)

the parts face are indicated.

•  MAIN board is multi-layer printed board.

However, the patterns of intermediate-layer have not been in-
cluded in the diagram.

*

Replacement of IC400 on MAIN board requires a
special tool.

•  Lead Layouts

surface

CSP (Chip Size Package)

Lead layout of conventional IC

•

8

•