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29

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.22).
• 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

#

30

Check Power (P.31)
Check Battery Charge (P.32)
Check Link (P.32)
Check the RF part (P.34)
Check Handset Transmission (P.37)
Check Handset Reception (P.37)
Check Caller ID (P.37)
Check BT Communication (P.39)

(*1) When a user claims that the unit disconnects a call right
after the greeting message and no incoming messages can
be recorded, this symptom can not reappear with TEL
simulator in the service center. In this case, try to change
the Auto disconnect activation time and Vox level. 

Power ON Base Unit

OK

OK

Playback Pre-Message

Record

OK

Range

Handset Voice Transmission

Handset Voice Reception

OK

OK

OK

OK

Caller ID function

Caller ID Error

No voice

No voice

Bluetooth Function

NG

Not charged

No playback

Not recording (*1)

Not working

NG

No link

OK

Link

Battery Charge

OK

31

BBIC is IC501.
(*1) Refer to Specifications (P.7) for part number and
supply voltage of AC adaptor.

(*2) Refer to Circuit Board (Base Unit_Main) (P.75).

(*1) Refer to Circuit Board (Handset_Main) (P.79)

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

Is output voltage of AC adaptor 5.5 V?

YES

Check

AC Adaptor.

Check VDD1(1.8 V) :Test point (VDD1)

(*2)

OK

Check Power Supply Circuit.

NO

NO

NO

NO

RSTN: Reset = "High"?(*2)

YES

Check Reset Circuit.

Check Xtal CLK=10.368 MHz?(*2)

YES

Check X501.

Check BBIC.

Check Power Supply Circuit/Reset Circuit.

Check X1, C52, C53.

Is the voltage of TP 1.8 V about 1.8 V?(*1)

Is the voltage of TP-VBAT 2.3 V more?(*1)

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

Is the battery inserted to BATT+ and BATT-?

Does BBIC (IC1: 49) oscillate at 10.368 MHz?(*1)

YES

YES

NO

NO

YES

Check BBIC (IC1).

YES

NO

32

Power Supply Circuit/Reset Circuit (P.12)
Check the RF part (P.34)

(*1) Refer to Things to Do after Replacing IC or X'tal (P.49)(P.55) for Base Unit.
(*2) Refer to Circuit Board (Base Unit_Main) (P.75)

Check Charge Circuit of Base Unit.

Check Handset.

Plug in the AC Power source.
Charge Handset on Base Unit.

Is the voltage of two charge contacts about
3 V or more?

OK

NO

Check Charge Contacts at 
Base Unit from mechanical point of view.

YES

Is BBIC (IC1: 34) high at charge state?

Check Charge Circuit.

Check Power of Handset.

Is Check Power OK?

NO

NO

YES

Check around Power Supply Circuit.

Does Base Unit connect to the properly working
Handset?

Check around X501 and RF module and adjust
clock frequency.(*1)

NO

NO

NO

NO

YES

YES

Is the voltage of VDD2 about 3.0 V?(*2)

Does the RF clock (CLK) oscillate at 10.368 MHz in
Base Unit Test Mode?(*2)

YES

Is the voltage of VDD1 about 1.8 V?(*2)

YES

Base Unit is OK. Check Handset.