Panasonic KX-TGE240B Service Manual page 39

10.1.5.2. Handset
Does Handset link with Base Unit?
(Properly working unit)
NO
Is the voltage of TP VBAT about 2.2~2.8 V?
YES
Is the voltage of TP VDDC about 1.2 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.23)
Check the RF part (P.40)
Note:
Refer to Things to Do after Replacing X'tal (P.56)(P.62) for Handset.
*1 How to adjust the frequency of X1.
KX-TGE240/242/243/244/245/260/262/263/264/270/272/273/274/275/TG454/TG465/TGEA20/TGA20
YES
Handset is OK. Check Base Unit.
NO
Check the batteries.
NO
Check around Power Supply Circuit/Reset Circuit.
NO Check around X1 and RF module and adjust
clock frequency.
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*1