30
KX-TG4771B/KX-TG4772B/KX-TG4773B/KX-TGA470B
10.1.1. Check Power
10.1.1.1. Base Unit
Cross Reference:
Power Supply Circuit/Reset Circuit
(P.12)
Note:
BBIC is IC501.
(*1) Refer to
Specifications
(P.6) for part number and
supply voltage of AC adaptor.
(*2) Refer to
Base Unit (Main)
(P.75).
10.1.1.2. Portable
Cross Reference:
Power Supply Circuit/Reset Circuit
(P.18)
Is the AC Adaptor inserted into AC outlet? (*1)
Is output voltage of AC adaptor 5.5 V?
YES
Check
AC Adaptor.
Check VDDC (1.2 V): Test Point [VDDC]
OK
Check
Power Supply Circuit
.
NO
NO
NO
NO
RSTN: Reset = "High"?
YES
Check
Reset Circuit
.
Check Xtal CLK = 13.824 MHz?
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-?
Does BBIC (IC1: 86) oscillate at 13.824 MHz?
YES
YES
YES
NO
NO
NO
Is the voltage of TP VDDC about 1.2 V?
NO
YES
Check BBIC (IC1).
YES
