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88 Reciter Fault Finding TB8100 Service Manual

Task 4 —

Deviation

Diagnostics Test

Important You must use version 03.04 or later of the Service Kit to

carry out this test.

1. Put the reciter in Standby Mode and select Diagnose > Power Ampli-

fier > Transmission Tests. In the Manual transmission area, set up

the test as follows:

■ Set the transmission frequency as required.

■ Set the modulation to Modulation on.

■ Set the deviation to 5kHz, the modulation level to 60%, and the

modulation frequency to 1000Hz.

2. Click Start Transmission and check that the deviation is 3kHz. If

the deviation is correct, repeat your previous task as follows:

■ If your previous task was Task 2, repeat Task 2.

■ If your previous task was Task 3, carry out the audio calibration

procedures using the Calibration Kit, and then repeat Task 3

. If

the deviation is still incorrect, return the complete reciter to your

nearest CSO for repair or replacement.

Note Before repeating your previous task, check that the reciter’s con-

figuration is correct; for example, for Task 2

check that the talk

through repeater gain is 0dB.

If the deviation is incorrect, recalibrate the exciter using the Calibra-

tion Kit and then repeat your previous task. If the deviation is still

incorrect, return the complete reciter to your nearest CSO for repair

or replacement.

Tait TB8100 Service Manual

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