Since I got my JP the T-rex hasn't been moving left to right. The guy I bought the pin off said it was working before transit so the fault has to be from transit. This seems believable because the occasions I have enabled the left/right action in the operator settings he has moved intermittently.
This leads me to believe that it is a dodgy connection somewhere. Sometimes, even with t-rex left/right disabled, during gameplay he'd randomly chomp his jaw once in a dozen games or so. I'm guessing that this chomping would normally be accompanied by left/right movement if it were turned on, so whenever he chomps during gameplay is when the dodgy connection happens to be working.
So today I decided to dedicate some time to try to fix the issue. When I turn left/right on in the settings he won't move in diagnostic mode at all. In both diagnostic mode and normal boot-test mode I can hear the relay switching attempting to move him. There was one occasion when he did start moving reliably and I was pleased but after moving around some of the wiring harness to do some more work he stopped working again. I am unsure if the connection issue is under the play field or somewhere along the wiring snake to the back box.
I have checked under the relay board and the shaker motor board for cracked solder and they appear to be perfect. The relay is switching as it should. When I test with a volt meter there is 35 volts passing through when switched one direction. When switched in the other direction there are no volts passing through. I believe the shaker motor uses the same relay and this is operating as it should.
Can anyone suggest where/what/how to test to diagnose the fault and find the dodgy connection? Thanks!