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29

Flash Memory is IC502.

BBIC is IC501.

Check Power (P.27)
Charge Circuit (P.16)

Check VDDC (1.8 V):  Test Point [VDD1]

OK

Check Power Supply Circuit.

Check output of BBIC (Pin 35,37).

OK

Check BBIC and Flash Memory.

Check Speaker and its surroundings.

NO

NO

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
5.5 V or more?

OK

NO

Check Charge Contacts at 
Base Unit from mechanical point of view in order
to check if a bad contact between Base unit
and Handset.

YES

Is BBIC (IC1: 34) 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

30

Power Supply Circuit/Reset Circuit (P.11)
Check the RF part (P.32)

(*1) Refer to Base Unit (Main) (P.81).
(*2) Refer to Check Point (Base Unit) (B) (P.39).
(*3) Refer to Check Point (Base Unit) (E) (P.39).

Check around Power Supply Circuit.

Adjust +3.0V voltage to 3.0 V.

 (*2)

 

Does Base Unit make link with normal working
Handset? 

Check around X501 and RF module and adjust
clock frequency.

 (*3)

NO

NO

NO

NO

YES

YES

Is the voltage of VBAT about 3.0 V?

 (*1)

Check the RF part

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

YES

Is the voltage of VDD1 about 1.8V? 

(*1)

Is the voltage of +3.0V about 3.0 V?

 (*1)

YES

YES

Base Unit is OK. Check Handset.

NO

OK

31

Power Supply Circuit/Reset Circuit (P.11)
Check the RF part (P.32)

(*1) Refer to Handset (Main) (P.85).
(*2) Refer to Check Point (Handset) (H) (P.41).

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. 

(*2)

 

NO

NO

NO

NO

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

(*1)

YES

YES

YES

YES

Is the voltage of CP3V about 3.0 V? 

(*1)

Does the RF clock (CKM) oscillate: 10.368 MHz
in Handset Test Mode?

Handset is OK. Check Base Unit.

YES

OK

Check the RF part.

 

NO

NO

Adjust 1.8V voltage to 1.8 V.

Is the voltage of CP4V about 4.0V? 

(*1)

 

(When LED is ON)

32

1. Re-register the checked handset to the checked base unit, and Regular HS to Regular BU.

(*1) HS: Handset
(*2) BU: Base Unit

1. Prepare Regular HS(*1) and Regular BU(*2).
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