Garmin GNC 250 Manual Perawatan dan Perbaikan - Halaman 20
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Halaman Cetak
MESSAGE (cont.)
Transmitter demodulated
audio is distorted or
noisy
Display does not show tx
indicator when mic is
keyed.
RECOMMENDED REPAIR (cont.)
Check output from 28v to 14v converter if so
equipped. Replace converter if output voltage is
higher than 15VDC
Check comm antenna in installation for intermittent
connection and/or high VSWR.
Verify connections from CPU Board to modulator
transistor Q34 and from Q34 to transmitter.
Verify connection between CPU Board and Comm
Receiver Board.
Replace comm chassis sub-assembly (see Section 3.2.2,
steps 1-7).
Replace modulator transistor Q34 (see Section 3.2.2,
steps 8-14)
Replace CPU Board (see Section 3.2.4)
Verify connection to external mic key.
Verify connection between CPU Board and Comm
Receiver Board.
Replace comm chassis sub-assembly (see Section 3.2.2,
steps 1-7).
Replace CPU Board (see Section 3.2.4)
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