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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 BAT about 2.2~2.8 V?
YES
Is the voltage of TP 1.8V about 1.8 V?
YES
Is the voltage of TP CP3.0 about 3.0 V?
YES
Does the RF clock (CLK) oscillate: 10.368 MHz
in Handset Test Mode?
YES
Check the RF part
Cross Reference:
Power Supply Circuit/Reset Circuit (P.20)
Check the RF part (P.40)
Note:
*1 3.0V can be adjusted along with bandgap voltage adjustment.
Refer to Adjustment of Handset (P.56).
*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, Refer to Adjustment of Handset (P.56).
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.
39
KX-TG3721BX/KX-TG3722BX/KX-TGA371BX
*1
*2
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