Tait TB7100, Руководство по обслуживанию

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122 Servicing Procedures TB7100 Service Manual
© Tait Electronics Limited October 2005
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 .