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29

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

Power Supply Circuit/Reset Circuit (P.10)

BBIC is IC501.
(*1) Refer to Specifications (P.6) for part number and
supply voltage of AC adaptor.

Power Supply Circuit/Reset Circuit (P.16)

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

Is output voltage of AC adaptor 6.5 V?

YES

Check 

AC Adaptor.

Check VDDC (1.2 V):  Test Point [VDDC]

OK

Check Power Supply Circuit.

NO

NO

NO

NO

RSTN: Reset = "High"?

YES

Check Reset Circuit.

Check Xtal CLK = 13.824 MHz?

YES

Check X501.

Check BBIC.

Check Power Supply Circuit/Reset Circuit.

Check BBIC (IC1).

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: 10) oscillate at 10.368 MHz?

YES

YES

YES

NO

NO

YES

YES

Is the voltage of " 1.8V"  about 1.8 V?

Is the voltage of CP3.0V about 3.0V?

Check BBIC (IC1).

YES

Is the voltage of CP4.0V about 4.0V?

NO

NO

30

Charge Circuit (P.11)

Check Power (P.29)
Charge Circuit (P.16)

Charge Circuit (P.16)

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: 52) high at charge state?

Check Charge Circuit.

Check Power of Handset.

Is Check Power OK?

NO

NO

YES

Check Charge Circuit of Charger Unit.

Check Handset.

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

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

OK

NO

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

YES

31

Power Supply Circuit/Reset Circuit (P.10)
Check the RF part (P.35)

*1 How to adjust +3.0V:
Execute the command "VDA"
Refer to Things to Do after Replacing IC or X'tal (P.xx) for Base Unit.

Check around Power Supply Circuit.

Adjust +3.0V voltage to 3.0 V. 

Does Base Unit make link with normal working
Handset? 

Check around X501 and RF module and adjust
clock frequency.

NO

NO

NO

NO

YES

YES

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

Refer to Check Point...(B)

Refer to Check Point...(D)

Does the RF clock (CLK) oscillate at 13.824 MHz in
Base Unit Test Mode?

YES

Is the voltage of VDDC about 1.2 V?

Is the voltage of +3.0V about 3.0 V?

Refer to Check Point...(G)

YES

YES

Base Unit is OK. Check Handset.

NO

OK

*1

*2

NO

YES

YES

YES

YES

NO

NO

NO

Replace with a new Circuit Board.

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

Is there CMD60 (: DECT Tester)?

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

YES

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

 

32

*2 How to adjust the frequency of X501:
To see the frequency, execute the command “SFR”, then check the TP_CKM (IC501-57pin).
To adjust frequency, send command “SFR” until the frequency counter becomes13.824 MHZ±55HZ.

Check Point (Base Unit) (P.41)

YES

NO

NO

NO

NO

Is the Frequency Drift OK? 
Refer to Check Point...(M).

YES

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

YES

Is the Timing OK? 
Refer to Check Point...(O).

YES

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

Replace with a new Circuit Board.