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Instrument and panel lights in 152
I just upgraded the radio stack from the Cessna radios and audio
panel to a Garmin package (audio panel, 430 and transponder). I noticed that the instrument panel light (red overhead) is now on what appears to be near full intensity when in the off position. When I rotate the control to highest intensity I can see a slight change (increase) in intensity. The lamp will not extinguish in any postion. The only change to this circuit was the disconnection of the radio display intensity circuit. It is my understanding that the two circuits are separate. The cessna service manual does not provide a detail of the circuit description so I cannot verify that this is a true statement. Transistors should not fail the way these symptoms appear so I assume they are ok. My suspicion is that the rheostat may be failing. With the dual rheostat, my fear is the part will be in the multiple hundreds of dollars. I need to find a small allen wrench to remove the two knobs and remove the switch for testing. I thought I would ask for suggestions before removing and testing the control. Does anyone know if these circuits can affect each other? Have you seen this problem before? Any suggentions will be appreciated. I don't believe that the problem was caused by the service done to the ac. I cannot verify that the problem did not exit before the upgrade. Tom |
#2
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Instrument and panel lights in 152
My best guess is that the "rheostat" is actually a potentiometer, and you
removed a ground from one end of the pot so that it cannot swing from +V to ground. "TNap" wrote in message ... Transistors should not fail the way these symptoms appear so I assume they are ok. REally? What makes you assume this? My suspicion is that the rheostat may be failing. My suspicion is a loose nut at the end of the screwdriver that installed the new radios. Jim |
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