Check Power - Panasonic KX-TG5521RUB Service Manual

9.1.1.

Check Power

9.1.1.1. Base Unit
Is the AC Adaptor inserted into AC outlet? (*1)
Is input of IC1 about 6.5 V - 8 V?
Is the output voltage of IC2 about 3.0 V?
Is the Collector of Q8 about 1.8 V?
Is the Collector of Q9 about 2.5 V?
Is the output voltage of BBIC (IC7:42) about 3.0V?
Is the output voltage of BBIC (IC7:43) about 2.5V?
Is BBIC (IC7: 61) High?
Does BBIC (IC7: 10) oscillate at 10.368 MHz?
Check BBIC (IC7).
Cross Reference:
Power Supply Circuit (P.9)
9.1.1.2. Handset
Is the battery inserted BATT+ and BATT-?
Is the voltage of BATT+ 2.3 V more?
Is the voltage of " 1.8V" about 1.8 V?
Is the voltage of CP3.0V about 3.0V?
Is the voltage of CP4.0V about 4.0V?
Does BBIC (IC1: 10) oscillate at 10.368 MHz?
Check BBIC (IC1).
Cross Reference:
Power Supply Circuit/Reset Circuit (P.12)
YES
YES
YES
YES
YES
YES YES
YES
YES YES
YES
YES
YES
YES
YES
YES
NO
Check C32, C36 are not shorted.
YES
Check AC Adaptor.
NO
Check Power Supply Circuit.
NO
NO
NO
Check BBIC (IC7).
NO
NO
NO
Check X1.
Note:
(*1) Refer to Specifications (P.6) for part number and
supply voltage of AC Adaptor.
NO
Check the battery and around BATT+ and
BATT- are not shorted.
NO
Check Power Supply Circuit/Reset Circuit.
NO
Check BBIC (IC1).
NO
Check X1.
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KX-TG5521RUB/KX-TGA551RUB