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Old 13-11-2017, 12:38 PM   #11
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A CDU will retain its charge for upwards of an hour, depending on the size of the capacitors used. So even when the input supply to the CDU is disconnected its still able to provide an output from the on-board capacitors! Hence I suspect the cause of the crackling noise heard.

I believe the PL50 has the middle connection as the common return while top and bottom connections are the two feeds going off to the motor for throw left or right.

Technically and so long as you have only fitted PL26 levers, they shouldn't provide any connection when in their full over position. Its possible the one that crackled is not breaking its connection when fully over somehow? Double check its a PL26 Then assuming it is a PL26 try moving that lever over and back a couple of times to see if it corrects the problem. Otherwise replace the PL26. Alternatively try swapping a known working motor over to the defective position and see what happens.
Broken? It was working when I left it!
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Old 13-11-2017, 01:42 PM   #12
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All, just sorted it. The black switch wasn't fully fitted in the module, probably happened when everything was packed up for the house move. I hadn't noticed it until now!!!!!! DOH!!

Thanks everybody for your help.
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