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2

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3

Disassembly Flow ...........................................................

4

Lid, Battery Case ............................................................

4

“Case (Front) Section”, “Case (Rear) Section” .............

4

MAIN Board ...................................................................

5

Installation “MAIN Board”,
“Microphone, Electric Condenser” (MIC101) ...............

5

..............................................................

6

5-1. Block Diagram ................................................................

7

5-2. Printed Wiring Board ......................................................

8

5-3. Schematic Diagram .........................................................

9

5-4. IC Pin Function Description ........................................... 12

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............................... 16

The BAD-BLOCK check* must be executed, when the flash
memory (IC702) in this set was replaced.
The set will not operation normally, unless this check is finished.

* The BAD-BLOCK check detects an area (bad-block) in the flash
memory where data validity cannot be guaranteed, and saves this
information in the TOC-AREA so that a bad-block is not used.

BAD-BLOCK check Procedure:
1. Apply 1.5 V from regulated power supply to the battery termi-

nals.

2. Once the power is supplied, the check starts and then proceeds

for approx. 45 seconds. (Be sure to keep applying the power
and pin yj or TP13 (green)/Pin yh or TP14 (red) signal “H”
during the check)
* Green/red LED of 

[OPR]

 indicator don't light up, therefore

it cannot be seen visually. Check the signal of pin yh , yj or
TP13, 14.

3. When the check completes, the result is shown as follows.

OK: Pin yh or TP14 signal “L” (Pin yj or TP13 Signal “H”)
NG: Pin yj or TP13 signal “H” (Pin yh or TP14 signal “L”)

4. In case of OK, press the 

[STOP]

 button.

• In case of NG, check system controller IC (IC701), flash memory IC

(IC702) and the peripheral circuit. (Particularly, check carefully the sol-
dering of the flash memory)

• After finishing the BAD-BLOCK check, assemble the set, load the dry

battery, and confirm if the set operates normally.

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

aged by heat.

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing 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.

3

This section is extracted from
instruction manual.

Refer to the pages indicated in parentheses for details.

9

q;

qa

qs

qd

qf

qg

1

2

3

4

8

5

6

7

1

VOL (volume) control (14)

2

FILE button (10, 13, 18)

3

MIC (built-in microphone)
(10)

4

NxPLAY/STOP (play/
stop•enter) button (8, 14, 15)

5

–

./>+ (fast forward/

fast backward•selection of
menu mode) button (13, 15)

6

STOP button (11)

7

HOLD switch (25)

8

PLAY SPEED selector (19)

9

MENU button (8, 21, 34)

0

Display window (33)

qa

OPR (operation) indicator
(10, 14)

qs

ERASE button (16)

qd

REC (record) START/STOP
button (10)

qf

Speaker

qg

EAR (earphone) jack (15)

5

1

2

3

4

6

7

8

9

1

Total number of messages in
a file (13)
Mode indication of the
menu(21, 26 - 28) (On, OFF,
etc.)

2

File indication (10, 13)

3

Current message number (10,
13)

4

Remaining recording time
indication (10)
Recording date indication
(14)
Current time/day indication
(8)
Menu indication (8, 21, 26 -
28, 34) (ALARM, etc.)
Messages (ERASE, SCAN,
etc.)

5

Alarm indicator (23)

6

Battery exhausted indicator
(7)

7

Repeat play indicator (15)

8

REMAIN indication (10)

9

REC DATE indication (14)

Clock setting display appears when you insert battery for the first time, or
when you insert battery after the unit has been without battery for a
certain period of time. In this case, proceed from Step 2.

Display the clock setting display.

Set the date.

1

2

. once to display

3

NxPLAY/STOP.

The year digits will flash.

2

NxPLAY/STOP.

The month
digits will flash.

3

Set the month and day in
sequence, then press
NxPLAY/STOP.
The hour
digits will
flash.

1

. or >+ to select the digits of the year.

1

2

* The “ALARM” display may

appear instead of the “BEEP”
display (see page 34).

Set the time.

Exit from the menu mode.

3

2

NxPLAY/STOP.

The minute digits will flash.

3

4

NxPLAY/STOP at the

time signal.
The display will return to
“SET DATE”.

4

1

. or >+ to select the digits of the hour.

4

 Follow the disassembly procedure in the numerical order given.

• This set can be disassembled in the order shown below.

Set

Lid, Battery Case

Installation “Main Board”, “Microphone, Electric Condenser” (MIC101)

Case (Front) Section

Case (Rear) Section

Main Board

3

2

2

1

2

2

2

4

3

1

5

3

#

5

1

×

2

3