Panasonic KX-TG9471B Service Manual page 28

KX-TG9471B/KX-TG9472B/KX-TGA939T
9.1.1. Check Power
9.1.1.1. Base Unit
Is the AC Adaptor inserted into AC outlet? (*1)
Is the input voltage of IC341: 5 about
5.5 V - 11 V?
Is the output voltage of IC341: 2 about 4 V?
Is the output voltage of IC331: 2 about 3.3 V?
Is the output voltage of IC321: 2 about 2.5V?
Is the Collector of Q381 about 3 V?
Is the Collector of Q386 about 1.8 V?
Is BBIC (IC501: 120) High?
Does BBIC (IC501: 21) oscillate at 10.368 MHz?
Check BBIC (IC501) and FLASH MEMORY 2
(IC561).
Cross Reference:
Power Supply Circuit (P.9)
9.1.1.2. Portable
Is the battery inserted to J1 (BATT+) and J2 (BATT-)?
Is the voltage of J1 over 2.3 V?
Is the voltage of +1.8 about 1.8 V?
Is the voltage of CP2.5 about 2.5 V?
Does BBIC (IC1: 10) oscillate at 10.368 MHz?
Check BBIC (IC1).
Cross Reference:
Power Supply Circuit/Reset Circuit (P.12)
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES YES
YES
YES
YES
YES
YES
Check C301, C302, C303, C311 are not shorted.
OK
Check AC Adaptor.
Check Power Supply Circuit.
Check BBIC (IC501), Q541.
Check X501, C512, C511, R511.
Note:
(*1) Refer to Specifications (P.6) for part number and
supply voltage of AC adaptor.
NO
Check the battery and around J1 (BATT+)
and J2 (BATT-) are not shorted.
Check the battery.
NO
Check Power Supply Circuit/Reset Circuit.
NO
Check BBIC (IC1).
NO
Check X1.
28
OK