I know this is an old thread but I accessed it about ten times when trying to sort out why my P/J motor would not start.
I also went through the rigmarole of trying to isolate the location of what I presumed was an electrical problem and arrived at the point where I found continuity on one of the motor windings (the contacts shown on one of the images posted by Annu) was faulty, pointing to the problem being located in the motor.
In order to access the motor, one either has to resort to the pallet jack method or as my smart electrician mate advised, simply unbolt the P/J module from the main body of the C3-31. ?As frightening and untenable as this seems, it was a breeze. ?I think there were nine bolts holding the two modules together and once removed -- accessed through the shaper door -- the two were separated and it was then simply a matter of tilting the module up on one end and the motor could be accessed.
Fortunately, the problem on my machine was in the connection box on the motor and once it was opened, the smell alone indicated a major mischief had occurred with the wires being fried in the connector block within which was partially melted and several of the wires welded together. The fix was achieved by simply replacing the connector block with a new one, reinserting the freshened wires and firing it up. ?Happy days!
Reconnecting the P/J module to the main body was a cinch and took all of about 30 mins.
Back to normal now but with the nagging, unanswered question -- what caused it to misbehave in the first place?
Incidentally, my local Felder man told me he doubted there was anew motor available in Australia and one would either need to be airfreighted from Austria or sent in a container (three months) or a possible more wallet friendly option would be to have the motor rewired. ?Fortunately, I did not need to go down that path.
Brian