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KX-TG7841/KX-TG7842/KX-TG7843/KX-TG7844/KX-TG7845/KX-TG365SK/KX-TG7871/KX-TG7872/KX-TG7873/KX-TG7874/KX-TG7875/KX-TG385SK/KX-TGA680
10.1.5. Check Link
10.1.5.1. Base Unit
Does Base Unit connect to the properly working
Handset?
NO
Is the voltage of VDD3 about 3.0V?
YES
Is the voltage of VDD1 about 1.8V?
YES
Does the RF clock (CLK) oscillate at 10.368 MHz in
Base Unit Test Mode?
YES
Check the RF part
Cross Reference:
Power Supply Circuit/Reset Circuit (P.15)
Check the RF part (P.42)
Note:
Refer to Things to Do after Replacing IC or X'tal (P.57)(P.63) for Base Unit.
*1 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
Base Unit is OK. Check Handset.
NO
Check around Power Supply Circuit.
NO
Check around X501 and RF module and adjust
NO
clock frequency.
"until the frequency counter becomes10.368 MHZ±55HZ.
40
*1
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