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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)