User's Manual

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Jotron AS| TR7750C: Operators Manual  ERROR CONDITIONS AND CORRECTIVE ACTIONS

Page 6-2

P/N: 84748 (pre_F)

28V

12V

5V

3.3V

-5V

One of the voltage

readings is out of

range

High

Temperature

Temperature

reading is above

+85°C

High Current

Current

consumption is

above 10A

High SWR

Caused by a SWR

reading higher

than 1:3

PA Module

TX alarm

Action:

Check antenna /

Antenna

connectors /

Antenna Cable

Action:

Replace -

TX unit (LRU)

PA module (LRM)

Probable cause:

Defective output

transistor

Action:

Replace -

TX unit (LRU)

PA module (LRM)

Probable cause:

Defective fan(s)

Action:

Replace -

TX unit (LRU)

PA module (LRM)

Probable cause:

Defective

component on

power regulator

board

Figure 6.1-1, Transmitter PA module, errors and corrective actions