Tait Limited TEL0024 用户手册

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Key transmitter.

Does fan run at

room temperature?

Spray "freeze" on R116

or short R113.

Does the low temperature

inhibit circuit stop the fan?

Spray "freeze" on R116

OR short R113.

Check IC3 pin 14 >11V.

Check Q21 & Q20.

N

N

Y

Y

Check Q20 & Q21 collector

voltages.  Check Q17 & Q18.

Check IC3 pin 14 <1V.

Check Q19.

Check Tx-key is low (at ground).

Do not key

transmitter.

Does high temperature control

circuit activate fan?

Heat R72 with tip

of soldering iron.

Check IC3 pin 8 >11V.

Check Q21 & Q20.

Fan control OK.

Heat R72 to >70°C with

tip of soldering iron.

N

Y