Panasonic KX-TG4753B Service Manual page 41

10.1.7.3. Range Extender
Does Range Extender make link with normal working
Base Unit and Handset?
NO
Is the voltage of VBAT about 3.0 V?
YES
Is the voltage of VDDC about 1.2 V?
YES
Is the voltage of +3.0V about 3.0 V?
YES
Does the RF clock (CLK) oscillate at 13.824 MHz in
Ranger Extender Test Mode?
YES
Check the RF part
Cross Reference:
Power Supply Circuit (P.24)
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.64) for Range Extender.
*2 How to adjust the frequency of X501:
To see the frequency, execute the command "SFR", then check the TP_CKM (IC501-57pin).
To adjust frequency, send command "SFR
YES
Range Extender in OK. Check Base Unit and
Handset.
NO
Check around Power Supply Circuit.
NO
NO
Adjust +3.0V voltage to 3.0 V.
OK
Check around X501 and RF module and adjust
NO
clock frequency.
"until the frequency counter becomes13.824 MHZ
41
KX-TG4753B/KX-TG470B/KX-TGA405B
*1
*2
55HZ.
±