Panasonic KX-TG3721BXB Service Manual page 34

KX-TG3721BX/KX-TG3722BX/KX-TGA371BX
10.1.1. Check Power
10.1.1.1. Base Unit
Is the AC Adaptor inserted into AC outlet? (*1)
Is output voltage of AC adaptor 5.5 V?
Check VDD1(1.8V) :Test point (VDD1)
RSTN: Reset = "High"?
Check Xtal CLK=10.368MHz?
Check BBIC.
Cross Reference:
Power Supply Circuit/Reset Circuit (P.13)
10.1.1.2. Handset
Is the battery inserted to BATT+ and BATT-?
Is the voltage of TP-BAT 2.3 V more?
Is the voltage of TP CP3.0 V about 3.0 V?
Is the voltage of TP 1.8V about 1.8 V?
Check Xtal CLK = 10.368MHz?
Check BBIC (IC1).
Cross Reference:
Power Supply Circuit/Reset Circuit (P.20)
YES
OK
YES
YES
YES
YES
YES
YES
YES
NO
AC Adaptor.
Check
NO
Check Power Supply Circuit.
NO
Check Reset Circuit.
NO
Check X501.
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).
NO
Check the battery and around BATT+ and
BATT- are not shorted.
NO
Check Power Supply Circuit/Reset Circuit.
NO
NO
Check X1.
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