Panasonic KX-TG4221N - Page 36

36
KX-TG4221N/KX-TG4222N/KX-TG4223N/KX-TG313SK/KX-TG4224N/KX-TG4225N/KX-TGA421N
10.1.5.2. Handset
Cross Reference:
Power Supply Circuit/Reset Circuit (P.21)
Check the RF part (P.37)
Note:
*1 How to adjust the frequency of X1:
To see the frequency, execute the command “SFR“, then check the TP_CKM (IC5-52pin).
To adjust frequency, send command “SFR “ until the frequency counter becomes10.368 MHz±55HZ.
Refer to Things to Do after Replacing IC or X'tal (P.54) for Handset.
Check around Power Supply Circuit/Reset Circuit.
Does Handset make link with Base Unit?
(Correct working unit)
Check around X1 and RF module and adjust
clock frequency.
NO
NO
NO
NO
Is the voltage of TP VBAT about 2.2~2.8 V?
Is the voltage of TP 1.8V about 1.8 V?
YES
YES
YES
YES
Is the voltage of 36 Pin (IC5) about 2.2~2.8 V?
Does the RF clock (CLK) oscillate: 10.368 MHz
in Handset Test Mode?
Handset is OK. Check Base Unit.
YES
NO
Check the RF part
Check the batteries.
*1