Panasonic KX-TG4763B Service Manual page 40

KX-TG4763B/KX-TGA470B/KX-TGA405B
10.1.7.2. Handset
Does Handset make link with Base Unit?
(Correct working unit)
Is the voltage of TP VBAT about 2.2~2.8 V?
YES
Is the voltage of TP VDDC about 1.2 V?
Is the voltage of TP 3.0 V about 3.0 V?
Does the RF clock (CLK) oscillate: 13.824 MHz
in Handset Test Mode?
Check the RF part
Cross Reference:
Power Supply Circuit/Reset Circuit (P.20)
Check the RF part (P.42)
Note:
*1 How to adjust +3.0V:
Execute the command "VDA"
Refer to Things to Do after Replacing IC or X'tal (P.65) 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
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NO
YES
YES
YES
manuals search engine
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.
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*1
*2