TB8100 Service Kit User’s Manual Power Amplifier Tests 1614. Check that the PA LED is on.After five seconds, the test ends and the LED’s connection with the PA isrestored.Testing the FanYou can ask the base station to turn the PA fan on and off. This tests the fanand its control circuitry.Test the fan after fixing a fan problem or fitting a new fan. When you fit a fan,use this test to verify that the fan is correctly connected, so that the PA (and notthe PMU) activates it.Note: The base station can detect the motion of 3-wire fans and willraise an alarm if the fan does not operate.To test the fan1. Select Diagnose > Power Amplifier > Control Tests.2. Click Start Test. This uncouples the fan from the base station’s control butleaves it in its current state.3. Click Toggle Fan. If the fan was off, this should turn it on.4. Check that the fan is operating. A 5-second timer counts down. When itexpires, the test ends and control of the fan reverts to the base station.Testing the TransmitterThe Transmission Tests form (Diagnose > Power Amplifier > TransmissionTests) lets you test the ability of the PA to transmit. Use it, for example, whensetting up and commissioning a system. You can:Q transmit using the current channel configurationQ specify any suitable frequency, and configure the output power and channelbandwidth.Q transmit carrier only or carrier modulated by your choice of modulationfrequency and deviation level.Tip: Alternatively, test the transmitter by pressing the Carrier buttonon the control panel.To ensure that you cannot inadvertently leave the base station transmitting, thetest automatically stops after 60 seconds.Note: You can carry out this test together with other tests, forexample to see the effect of transmission on battery voltage whenthe mains supply is off.
