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(*1) Refer to Troubleshooting by Symptom (Base Unit and Charger Unit) (P.38)

Check Point (Base Unit) (P.38)
Power Supply Circuit (P.12)

Check around Power Supply Circuit.

Adjust +3.0V voltage to 3.0 V.
Refer to Check Point...(B).

Does Base Unit make link with normal working
Handset?

Check around X501 and adjust clock frequency.
Refer to Check Point...(G).

NO

NO

NO (*1)

NO

YES

YES

YES

YES

YES

NO

NO

NO

Replace with a new Circuit Board.

Is the modulation OK? 
Refer to Check Point...(K).

Is the voltage of VDD3  about 3.0V?
Refer to Check Point...(A).

Is there CMD60 (: DECT Tester)?

Does the RF clock (CLK) oscillate at 10.368 MHz in
Base Unit Test Mode?
Refer to Check Point...(G).

Is the voltage of +3.0V about 3.0 V?

YES

Is the NTP value OK? 
Refer to Check Point...(J).

Does Base Unit make link with CMD60 in Base Unit 
Test Mode?
Refer to Check Point...(J).

NO

YES

Base Unit is OK. Check Handset.

YES

YES

Is the Frequency Offset OK? 
Refer to Check Point...(L).

NO

OK

NO

NO

Is the Sensitivity Receiver OK?
Refer to Check Point...(M).

YES

Is the Power RAMP OK?
Refer to Check Point...(N) .

Replace with a new Circuit Board.

30

Check Point (Handset) (P.40)
Power Supply Circuit/Reset Circuit (P.15)

Check around Power Supply Circuit/Reset Circuit .

Check BBIC (IC1).

Does Handset make link with Base Unit?
(Correct working unit)

Check around X1 and adjust clock frequency. 
Refer to Check Point...(H).

NO

NO

NO

NO (*1)

NO

Is the voltage of "1.8V" about 1.8 V?
Refer to Check Point...(A).

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

Replace with a new Circuit Board.

Is the voltage of CP3V about 3.0 V?
Refer to Check Point...(P) .

Does the RF clock (CLK) oscillate: 10.368 MHz
in Handset Test Mode?
Refer to Check Point...(H).

Is the NTP value OK?
Refer to Check Point...(I).

Does Handset make link with CMD60 in
Handset Test Mode?
Refer to Check Point...(I).

NO

Handset is OK. Check Base Unit.

YES

OK

Is there CMD60 (: DECT Tester)?

NO

NO

YES

Is the modulation OK?
Refer to Check Point...(J).

YES

Is the Frequency Offset OK?
Refer to Check Point...(K).

Adjust 1.8V voltage to 1.8 V.
Refer to Check Point...(A).

... Continued to the next page.

Is the voltage of CP4V about 4.0 V?
(When LED is ON)
Refer to Check Point...(Q).

31

NO

NO

Is the Sensitivity Receiver OK?
Refer to Check Point...(L).

YES

YES

Is the Power RAMP OK?
Refer to Check Point...(M).

Replace with a new Circuit Board.

32

1. Re-register the checked Handset to the checked Base Unit, and Regular HS to Regular BU.

If you need to register a handset, refer to Registering a Handset to a Base Unit in the Operating Instructions.

1. Prepare Regular HS (Handset) and Regular BU (Base unit).
2. a. Re-register regular HS (Normal mode) to Base Unit (to be checked).
        If this operation fails in some ways, the Base Unit is defective.
    b. Re-register Handset (to be checked) to regular BU (Normal mode). 
        If this operation fails in some ways, the Handset is defective.

Base Unit is defective

Handset is defective

START

Registration of 

Regular HS to

Base Unit

Registration of 

Handset to

Regular BU

(other checkings)

Registration of Handset to Base Unit 

(checked ones)

Registration of Regular HS to Regular BU

Yes

No

No

Yes