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[ Content ]
Because the display content must be checked during service
mode execution, the LCD backlight is always ON at this menu.
[ Operating procedure ]

1. Select [ SERVICE 1 ] on the service mode menu and then

press the [PLAY/STOP] button, then displayed the LCD
display mode switching screen.

2. Use the [+] and [-] buttons to select "ON", and then press

the [PLAY/STOP] button to execute display mode switch-
ing.
It returns to the audio mode after executes it.

Another SERVICE mode should be executed within 1
minute after switching is performed. If the auto power OFF
function is activated, the system returns to the "display ON/
OFF control enabled" mode.

[ Content ]
This display is used to verify that the device key is written to the
main PCB's IC4 (Flash ROM) without error.
[ Operating procedure ]

1. Select [ SERVICE 2 ] on the service mode menu and then

press the [PLAY/STOP] button, then displayed the device
key serial number information.

If the device key serial number fails to display, there is
a problem with the IC4 (Flash ROM).

2. Turn the power OFF to complete the procedure.

10

[ Content ]
Displays the rechargeable battery voltage, and the KEY IN volt-
age AD conversion values (hexadecimal) at the [FWD-Skip],
[REW-Skip], [MODE], [MARK], [+], [-] key operations.
The AD conversion value is used for button operation checks
and for the remaining battery capacity display.
[ Operating procedure ]

1. Select [ SERVICE 3 ] on the service mode menu and then

press the [PLAY/STOP] button, then displayed the battery
capacity display and control button operation check
screen.

2. Turn the power OFF to complete the procedure.

Check the BATT's AD conversion value and the remaining 
battery capacity display.
The BATT display (hexadecimal) indicates the voltage of the
internal rechargeable battery.
The internal rechargeable battery voltage =
2.9 (V) x [BATT display content] / 1024.
[Example]
When the BATT value is "1CC" ("460" as decimal value):
Internal rechargeable battery voltage = 2.9 x 460 / 1024 = 
1.3027....= 1.303 (V)

The value of BATT2: is not used in this mode. 

Displays the AD value judgment for the button operation.
Press each of the [FWD-Skip], [REW-Skip], [MODE], [MARK],
[+], [-] buttons and verify the changes in the KEYIN's AD 
conversion value.

If the AD conversion value displayed at the button operation
is outside the range shown in the table, this may indicate a
hardware malfunction.

Remaining Battery Voltage 

Display

AD Conversion Value

3 battery marks

1C3 < Batt

2 battery marks

1B3 < Batt < or = 1C3

1 battery mark

19B < Batt < or = 1B3

Blinking battery mark

172 < Batt < or = 19B

Low battery voltage

           Batt < or = 172

Button Operation

AD Conversion Value

FWD-Skip

000 ~ 055

REW-Skip

056 ~ 0FF

MARK

100 ~ 1AA

+

1AB ~ 255

-

256 ~ 2FF

MODE

300 ~ 3AA

No key input

3AB ~ 3FF

11

[ Content ]
Displays the model, region and firmware version information.
This content cannot be changed.
[ Operating procedure ]

1. Select [ SERVICE 4 ] on the service mode menu and then

press the [PLAY/STOP] button, then displayed the model
and region information.

• Content of display

- The mark at the right of “MODEL INFO” is the 

following information:
#.....Model and region setting in the service mode.
* .....Model and region setting in the factory setting.

- 2nd line: Model and firmware information.
- 4th line: Region information.

It differs according to the country.

2. Turn the power OFF to complete the procedure.

[ Content ]
Verifies that the SD-card (where audio file is saved) can be 
recognized.
[ Operating procedure ]

1. Select [ SERVICE 8 ] on the service mode menu and then

press the [PLAY/STOP] button, then displayed the card’s
detection count screen.

2. Remove the service mode SD-card, then insert it again.

• The count value increases by 1 (1 card insertion) after

the microcomputer reads the default data from the SD-
card.

3. Open the battery cover to complete the procedure.

12

[ Content ]
Performs repeat playbacks, checking for audio playback errors.
[ Operating procedure ]

1. Select [ SERVICE 9 ] on the service mode menu and then

press the [PLAY/STOP] button, then displayed the audio
playback error check screen.

2. Playback begins and the repeat count (number of returns

to first song) displays on screen.

• Content of display

1st line: Test name
2nd line: Repeat count
4th line: Track number and elapsed playback time

3. Repeat playbacks continue until a playback error occurs.

Therefore, if no error has occurred after approximately 10
playbacks.

4. Open the battery cover to complete the procedure.

If a playback error occurs, playback is stopped, and an error
code displays on screen.

• Content of display

1st line: Test name
2nd line: Repeat count
3rd line: Error code
4th line: Track number and elapsed playback time

For error code details, refer to section 6.14 (Error Code Table).
Open the battery cover to complete the procedure.

[ Content ]
Performs repeat playbacks, checking for voice playback errors.
[ Operating procedure ]

1. Select [ SERVICE 10 ] on the service mode menu and

then press the [PLAY/STOP] button, then displayed the
voice playback error check screen.

2. Playback begins and the repeat count (number of returns

to first voice) displays on screen.

• Content of display

1st line: Test name
2nd line: Repeat count
4th line: Track number and elapsed playback time

3. Repeat playbacks continue until a playback error occurs.

Therefore, if no error has occurred after approximately 10
playbacks.

4. Open the battery cover to complete the procedure.

If a playback error occurs, playback is stopped, and an error
code displays on screen.

• Content of display

1st line: Test name
2nd line: Repeat count
3rd line: Error code
4th line: Track number and elapsed playback time

For error code details, refer to section 6.14 (Error Code Table).
Open the battery cover to complete the procedure.