Panasonic KX-TG7622B - Making;Answering Calls Using the Base Unit; Transferring a cellular call between the base unit and a cellular phone; Using the other line during a conversation; Making;answering a cellular call during a conversation on the landline

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KX-TG7622B/KX-TG7623B/KX-TGA410B
10.1.1. Check Power
10.1.1.1. Base Unit
Cross Reference:
Power Supply Circuit/Reset Circuit (P.14)
Note:
BBIC is IC501.
(*1) Refer to Specifications (P.6) for part number and
supply voltage of AC adaptor.
(*2) Refer to Circuit Board (Base Unit_Main) (P.81).
10.1.1.2. Handset
Cross Reference:
Power Supply Circuit/Reset Circuit (P.22)
Is the AC Adaptor inserted into AC outlet? (*1)
Is output voltage of AC adaptor 5.5 V?
YES
Check AC Adaptor.
Check VDD1(1.8V) :Test point (VDD1)
OK
Check Power Supply Circuit.
NO
NO
NO
NO
RSTN: Reset = "High"?
YES
Check Reset Circuit.
Check Xtal CLK=10.368MHz?
YES
Check X501.
Check BBIC.
Check Power Supply Circuit/Reset Circuit.
Check X1, C8, C9.
Is the voltage of TP 3.0 V about 3.0 V?
Is the voltage of TP-VBAT 2.3 V more?
Check the battery and around BATT+ and
BATT- are not shorted.
Is the battery inserted to BATT+ and BATT-?
Check Xtal CLK = 13.824MHz?
YES
YES
YES
NO
NO
NO
Is the voltage of TP VDDC about 1.8 V?
NO
YES
Check BBIC (IC1).
YES