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6

 Follow the disassembly procedure in the numerical order given.

z

 The equipment can be removed using the following procedure.

Driver ASSY (SP2), Arm lid (R), Holder lid (R)

<R-CH section>

<L-CH section>

Main board, Power board, LCD unit

Set

Driver ASSY (SP1), Arm lid (L), Holder lid (L)

8

6

3

1

LCD unit

Holder (R) ASSY

Arm lid (R)

4

 Remove solder

(2 places)

2

 Turn to clockwise 

to release lock.

Red

Black

Black

7

 Screw B1.7x5

5

 Screws 

B1.7x5

7

 Screw 

B1.7x5

Front plate

Red

Ear pad

Driver ASSY (SP2)

Driver ASSY

Marking (red)

Red

Glue

Black

• Connection of driver ASSY

Arm lid (R) (rear side)

• Installation of holder lid (R) 

and arm lid (R)

Claw

Holder lid (R) (rear side)

Holder lid (R)

5

3

1

Holder (R) ASSY

2

 LCD flexible board

(Power board: CN705)

Power board

LCD unit

Knob (HOLD)

Cord (4 core)

4

 Remove solder

(4 places)

Red

Red/clear (rear side)

Green/clear

Green

CN704

CN702

Main board

HOLD switch
(S704)

z

 Caution during assembly

Align HOLD switch (S704) with 
the position of knob (HOLD).

7

9

6

3

1

Driver ASSY

Ear pad

Marking 
(red)

Red

Glue

Black

• Connection of driver ASSY

Red

Black

Black

Green

Red

Red

Red/clear

Green/clear

Cord (4 core)

• Wiring of cord (4 core)

Arm lid (L)

Front plate

2

 Turn to clockwise 

to release lock.

5

 Screws 

B1.7x5

8

 Screw 

B1.7x5

8

 Screws B1.7x5

7

 Open the battery lid.

Driver ASSY (SP1)

Holder lid (L)

Holder (L) ASSY

MDD flexible board

4

 Remove solder

(2 places)

Note:
When soldering, 
paying attention as 
holder (L) doesn’t 
transform it by a heat.

• Installation of holder lid (L) 

and arm lid (L)

Claw

Holder lid (L)

Lid (L), arm
(rear side)

8

To enter the test mode, two methods are available :
1. Entering method with key input.

Turn the HOLD switch to ON. While holding down the Bx key, press the following keys in the following order :
VOLUME + 

t VOLUME – t VOLUME – t VOLUME + t VOLUME – t MEGA BASS t MEGA BASS t DISPLAY

 Push each key for less than 3 seconds.

2. Entering method by shorting the test point.

Solder brige the test point SL701 (TEST) on the main board and turn on the power.

1. When test mode was entered with key input, turn off the power supply.
2. When test mode was entered by shorting the test point, turn off the power supply and open the solder brige of SL701 (TEST) on the main

board.

Test mode
Short : Test mode
Open : Normal mode

(

    )

1

4

LCD

Check

Ver. /

destination

display

All display

lit

(+)

(–)

All display

off

Flash memory

bad block

check

Bx

Bx

(+)

(–)

(+)

(–)

Destination

setting

Contrast

adjustment

(–)

Low voltage

check

(–)

Bx

Bx

(–)

High DC
detection

check

Low DC

detection

check

(+)

Supply 0.9V DC to battery 
terminal and press (–) key.

Supply 1.24V DC to battery 
terminal and 7V DC to USB 
connector and press (+) key.

Supply 1.24V DC to battery 
terminal and 4V DC to USB 
connector and press (+) key.

The test mode has the configuration given below.

Bx

: Play/stop key

(+)

: VOLUME + key

(–)

: VOLUME – key

C

C703

C704

R764

R769

R7

7

R705

R703

R767

R783

R7

7

R7

7

JC722

X701

TP702

TP3 TP701

TP703

(TEST)

IC820

CN701

USB

CONNECTOR

4

4

1

1

1

2

2

3

3

5

5

5

13

(13)

1-681-242-

P701

D781

MAIN BOARD   (SIDE B)

9

9

• X

: parts extracted from the component side.

•

: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

  Caution:

Pattern face side:

Parts on the pattern face side seen from the

(Side B)

pattern face are indicated.

Parts face side:

Parts on the parts face side seen from the

(Side A)

parts face are indicated.

• Main board is six-layer printed board.

However, the patterns of layers 2 to 5  have not been
included in this diagrams.

Lead layout of
conventional IC

CSP (chip size package)

*

Replacement of IC710 used in the set requires a spe-
cial tool.

• Lead Layouts

surface

z

Note on Schematic Diagram:
• All capacitors are in 

µ

F unless otherwise noted.  pF: 

µµ

F

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

specified.

•

: B+ Line.

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

supply from battery terminal.

• Voltages and waveforms are dc with respect to ground in

playback mode.
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 produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.
• Signal path.

J

: DIGITAL

F

: ANALOG

• The voltage and waveform of CSP (chip size package)

cannot be measured, because its lead layout is different
form that of conventional IC.

*

Replacement of IC710 used in the set requires a spe-
cial tool.

LCD check

Check the condition of indication by all display is lit or not.

Bx key : check start

Flash memory bad block check

OK

:  FL OK  The back light turns on

NG

:  FL NG  The back light turns on and off

AVLS key : select the destination

       AR  J  (AEP, E).

Destination setting

Bx key : Enter the destination

OK

: WT OK  The back light turns on

NG

: WT NG  The back light turns on and off

Contrast adjustment

Display 

t LC45

contrast value (Initial value : 45)

>, . key  : Select the contrast value.

Bx key

: Enter the contrast value.

Normally, do not perform this adjustment.

Low voltage check

Low voltage detection check

OK

:  LB OK  The back light turns on

NG

:  LB NG  The back light turns on and off

Battery high voltage detection check

High DC detection check

OK

:  HD OK  The back light turns on

NG

:  HD NG  The back light turns on and off

Battery low voltage detection check

Low DC detection check

OK

:  LD OK  The back light turns on

NG

:  LD NG  The back light turns on and off

R

The regulated DC power supply voltage supplied to USB connector on checking each voltage value.

OK

NG

Low voltage check

0.9V

1.0V or more

High DC detection check

7.0V or more

6.0V or less

Low DC detection check

4.0V or less

5.0V or more