I have a wireless keyboard with a defective on/off switch. The switch has a little play, and it's closing the circuit only when it is almost pushed to the extreme position for on. If 0 represents the leftmost position and 1 the rightmost one, it's closing the circuit for a number around 0.8.
So I decided to disassemble the keyboard and see whether it's possible to repair this. Here is a photo of the circuit:
The keyboard currently uses four 1.5V AA batteries, and I also intend to use an external power supply instead. So I would like to permantently close the circuit at SW5.