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10.1.5.2. Handset
Does Handset make link with Base Unit?
(Correct working unit)
NO
Is the voltage of TP VBAT about 2.2~2.8 V?
YES
Is the voltage of TP VDDC about 1.8 V?
YES
Is the voltage of TP 3.0 V about 3.0 V?
YES
Does the RF clock (CLK) oscillate: 13.824 MHz
in Handset Test Mode?
YES
Check the RF part
Cross Reference:
Power Supply Circuit/Reset Circuit (P.22)
Check the RF part (P.40)
Note:
*1 How to adjust +3.0V:
Execute the command "VDA"
Refer to Things to Do after Replacing IC or X'tal (P.63) for Handset.
*2 How to adjust the frequency of X1:
To see the frequency, execute the command "SFR", then check the TP_CKM (IC1-57pin).
To adjust frequency, send command "SFR
YES
Handset is OK. Check Base Unit.
NO
Check the batteries.
NO
Check around Power Supply Circuit/Reset Circuit.
OR
Adjust +3.0V Vottage to 3.0V
NO
Check around X1 and RF module and adjust
clock frequency.
"until the frequency counter becomes13.824 MHz±55HZ.
39
KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S
*1
*2
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