[3pinplug]

Results of tests requested;-

Pin 13 - state does change between 0-12v when I press the flick switch. Up /down. Up = 12v, down = 0v.

Same effect voltage wise for spin wheel, clockwise 12v, anticlockwise Ov.

No pulse seen at pin 18 when idle.

Pulses seen at Pin18 when I spin wheel in either direction and flick up / down switch either way. Interesting to observe all this!

Set channel to 5kHz and highest band -yes did see pulse on pin 18 when flicking up down switch.

Was there 37.5kHz on pin 10? I recorded 35 kHz on pin 10.

So does this confirm logic board OK? I have left the 4 pins disconnected in case next set of tests requires the same. Thanks again for helping with this Peter and Paula you certainly know your Racal Danas. 👍