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The purpose of this section is to describe the layout of the EEPROM (IC3) for the KX-TGA681 Handset.
The EEPROM contains hardware, software, and user specific parameters. Some parameters are set during production of the

handset, some are set by the user when configuring the handset, and some during normal use of the phone.

The handset uses a 64k bit serial EEPROM (IC3) for storing volatile parameters. All parameters are set up before the handset
the factory. Some of these are vital for the operation of the hardware so a set of default parameters is programmed before the
actual hardware fine-tuning can be initiated. This document lists all default settings with a short description.
This document lists all default parameters with a short description.

F

The data initialized by only F command

0

The data initialized by F and 0 command

1

The data initialized by F, 0 and 1 command

2

The data initialized by F, 0, 1 and 2 command

3

The data initialized by all command (F, 0, 1, 2, 3)

x

Default - no specific country setting, so revert to default value.

04AE

3

EEP_Language

Selected Language for LCD
GERMAN:0      ENGLISH:1     SPANISH:2    NORWEGIAN:3   
FRENCH:4
ITALIAN:5    DENISH:6      DUTCH:7      SWEDISH:8     
FINNISH:9
GREEK:10     TURKISH:11    HUNGARIAN:12 
PORTUGUESE:13 RUSSIAN:14
POLISH:15    SLOVAKIAN:16  CZECH:17     CROATIAN:18   
CATALAN:19
UKRINIAN:20 SPANISHMEX:21    SLOVENIAN:22    
ESTNIAN:23    LITHUANIAN:24
LATVIAN:25    ROMANIAN:26    BULGARIAN:27    
MACEDONIAN:29
ALBANIAN:30    PORTUGUESEMEX:31    ENGLISH(USA):32    
HEBREW:33
ARABIC:34    PERSIA:35    HANTAI:36    HANTAI(HK):37    
RUSSIAN(BX):38
BELARUS:39  KAZAKHSTAN:40    UZBEKISTAN:41    
TAJIKISTAN:42  
TURKMENISTAN:43  AZERBAIJAN:44   ARMENIA:45    
MOLDOV:46
CANADAENGLISH:48  USSPANISH:49  USFRENCH:50  
PORTUGUESE:51  ENGLISH(AZ):52

0x01

0x14

0012

F

EEP_LcdContrast

0x28

x

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Units are reset to the Factory settings by this operation (Erase recorded Voice messages, stored Phone numbers, Caller list and
etc.)

• Some menus are not reset. Refer to Operating Instructions (P.20).
• The reset menus differ depending on the following operations.
• This operation should not be performed for a usual repair.

Both the base unit and the registered handset which you did the following steps 

 to 

 are reset. Other registered handsets

will not be reset.

(*1) Refer to Registering a Handset to a Base Unit in the Operating Instructions.

The only handset is reset by doing the following steps 

 to 

.

Note: (*2)

• The handset registration to the base unit is cancelled.
• If the handset needs to be registered to the base unit, refer to Registering a Handset to a Base Unit in the Operating

Instructions.

• If users do not bring the base unit with them, the registration procedure has to be done by users themselves.

1

 Connect the AC adaptor to the base unit and install the charged batteries into the handset.

2

 Confirm the handset is registered to the base unit (     lights). 

    If the handset is not registered to the base unit (     lights), register it. (*1)

3

 Lift the handset and press 

{ih} to put the handset in standby mode.

4

 Press     ,     ,      and      key of the handset simultaneously until a confirmation tone is heard.

5

 Disconnect the AC adaptor, then remove the battery.

1

5

9

w

1

 Install the charged batteries into the handset.

2

 Lift the handset and press {ih} to put the handset in standby mode.

4

 Remove the battery.

3

 Press     ,     ,      and      key of the handset simultaneously until a confirmation tone is heard. (*2)

3

5

7

#

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*1 KX-TG6821 only

Check Power (P.28)
Bell Reception (P.37)
Check Battery Charge (P.29)
Check Link (P.30)
Check the RF part (P.33)
Check Handset Transmission (P.36)
Check Handset Reception (P.36)
Signal Route (P.18)
Check Caller ID (P.36)
Check TAM Operation (for KX-TG6821 only) (P.37)

Power ON Base Unit

Bell

Link

Battery Charge

Handset Voice Transmission

Handset Voice Reception

DTMF dial

OK

OK

No Link

OK

OK

OK

OK

OK

Not working

No bell

No voice

No charge

No voice

No signal

Range

NG

Caller ID Reception

OK

No signal

TAM Operation

*1

OK

Not working

28

Is the AC Adaptor inserted into AC outlet? (*1)

(*1) Refer to Specifications (P.7) for part number and supply voltage of AC Adaptor.

Is input of IC302 about 5.5 V?

Check AC Adaptor.

Check Power Supply Circuit.

Is the output voltage of IC302 about 3.0 V?

Does BBIC (IC501: 36) oscillate at 13.824 MHz?

Check X501.

Check BBIC (IC501).

Is BBIC (IC501: 54) High?

Check BBIC (IC501).

YES

YES

YES

YES

YES

NO

NO

NO

NO

Check C321, C341 are not shorted.

YES

Check F301 are not open.

Is the output voltage of BBIC (IC501:15) about 
3.0 V?

YES

NO

Check Power Supply Circuit/Reset Circuit .

Check BBIC (IC1).

Check F1 is not open.

Check X1.

Is the voltage of  BATT+ 2.3 V more?

Check the battery and around BATT+ and
BATT- are not shorted.

Is the battery inserted BATT+ and BATT-?

Does BBIC (IC1: 7) oscillate at 10.368 MHz?

YES

YES

YES

YES

NO

NO

YES

YES

Is the voltage of +1.8V about 1.8 V?

Is the voltage of CP3V about 3.0 V?

Check BBIC (IC1).

YES

 

Is the voltage of CP4V about 4.0V ? 
(When LED is On)

YES

Is the voltage of CP2.8V about 2.8 V?

NO

NO

NO

Check D3.

NO