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122 Servicing Procedures TB7100 Service Manual

6. If there was a fault, replace the volume potentiometer RV1. If not

replace the UI cable and retest. If there is still a fault replace the

UI board.

7. Confirm the removal of the fault.

Task 13 —

Check the Fans

These tests assume that Tasks 1 to 5 were successful.

1. Set the jumpers on the SI board to match the settings below.

■ J206 = 2-3

2. Check that both fans turn on. If they do, go to Step 4. If one fan turns

on, go to Step 3. If no fans turn on, check that there is 12V between

pins 1 and 2 of J201. If not, replace the SI board.

3. Check for 12VDC between pins 1 and 2 on all connectors on the fan

power board. If there is, replace the faulty fan(s). If not, replace the

fan power board.

4. Set the jumpers on the SI board to match the settings below.

■ J206 = 1-2

■ J207 = 1-2

5. With the transmitter module connected to a suitable load, check that

fans activate only when the TX Key line is activated.

6. If they do, go to Step 7. If not, replace the SI board.

7. Set the jumpers on the SI board to match the settings below.

■ J206 = 1-2

■ J207 = 2-3

8. Attempt to turn RV200 clockwise until the fans turn on and then

anticlockwise until fans just turn off. If successful, go to Step 10.

If not, go to Step 9

9. Connect a spare temperature sensor and repeat Step 8. If the fault is

still present, replace the SI board.

10. Use a hot air tool to gently heat the temperature sensor. If the fans

turn on, the temperature sensor and fans are operating correctly.

Reset RV200 to the correct turn-on temperature. If the fans do not

turn on, replace the temperature sensor and repeat from Step 8.

Tait TB7100 Service Manual

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