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Hi,
If you look at the control panel for the HEQ5Pro, you will see underneath, two small holes - each hole has I think a M3 screw in it, you can undo this with a #1 philips screwdriver. Once the panel is loose, it should hang down a little, since the two cables are not very long. You may have to rotate the RA axis to get a good look at it. Basically, the switch has a red and black wire going to a small two-pin plug/socket arrangement. The led is driven on this board, so if the switch isn't working, then the led won't light up. At the same time, you can see the socket for the power connection - the pin is the connection at the end. If the socket is somehow loose, occasionally the pin has either come adrift or maybe the connection to the board has broken.
I can try to take a photo of my control panel if it helps you.
-John
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