Read Panasonic KX-TG7851CAB / KX-TG7852CAB / KX-TG7861CAB / KX-TGA785RUB Service Manual online
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KX-TG7851CAB/KX-TG7852CAB/KX-TG7861CAB/KX-TGA785RUB
9.1.1.
Check Power
9.1.1.1.
Base Unit
Is the AC Adaptor inserted into AC outlet? (*1)
Cross Reference:
Power Supply Circuit (P.12)
Note:
(*1) Refer to Specifications (P.7) for part number and supply voltage of AC Adaptor.
Is input of IC302 about 5.5 V?
Check C321, C341 are not shorted.
Check AC Adaptor.
Check Power Supply Circuit.
Is the output voltage of IC302 about 3V?
Does BBIC (IC501: XTAL1) oscillate at 10.368 MHz?
Check X501.
Check BBIC (IC501).
Is the Collector of Q301 about 1.8 V?
Is BBIC (IC501: RSTn) High?
Check BBIC (IC501).
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is the Collector of Q302 about 2.5 V?
YES
Is the output voltage of BBIC (IC501:CP_VOUT2)
about 3.0V?
about 3.0V?
Is the output voltage of BBIC (IC501:CP_VOUT1)
about 3.0V?
about 3.0V?
YES
YES
NO
NO
NO
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