Quoted from Mr_Tantrum:I posted in JP club topic, but thought I would open to the community in general. Unfortunately, my electronics knowledge is limited so thought I would see if any experts could help me.
I have read everything I can find, but did not uncover my exact scenario with my T-rex side-to-side movement not working (previous owner informed me that he had disabled it, but hadn't had time to diagnose). Here is the situation this far:
- Blue power cable for motor was disconnected, so I reconnected for my testing (disconnected when done since I don’t want the motor running full time).
- Manual side movement is not possible (i.e. try to turn the T-rex by hand and it won't budge - no play in it at all).
- Removed motor from gearbox and manual movement is free (of course) and when looking into gearbox it appears that the gear that is visible is fully intact with all teeth.
- While motor is disconnected when I turn on pin the motor begins to run and never stops running.
- In T-Rex test mode, motor does reverse direction back and forth with press of left and right flipper buttons.
- If I hold the long gear that is attached to the motor while running, I can easily stop its rotation, but seems like the motor itself is still spinning (ie the gear is slipping).
- Voltage to motor is pretty constant 4.5V.
My first thought is why is the motor spinning at all times? Why is this not enough force to turn T-rex, and has this trashed the motor?
playing with mine right now too.. but to remove T-rex
You can do it without removing the top-side elements.. but I think it would be easier.
T-rex has an apron around him that sits above the large plastic that covers the raptor pit, etc. That apron is held by three screws that are blocked when T-rex is upright. Remove the screw in the back of the t-rex head to remove back half of t-rex plastic. Remove two screws at base of front of T-rex which hold the front plastic and rubber apron to remove front half of t-rex plastic. You should be able to get to the three screws holding the brackets holding the skirt plastic in place. Should be able to get t-rex out without removing the large plastic now (I didn't do this, so speculating - I had removed the large plastic as well)
To drop the whole t-rex.. just unplug the harnesses for the switches and motors. Remove the 4 wood screws holding the large bracket to the PF. Whole assembly will drop as a whole.
To get to gearbox... remove the e-clip and washer from the sliding pivot near the switches that track left/right/home stops. Be careful not to manage the switches accidentally.
After that, it's just the shaft from the gearbox holding the lower plate to the t-rex upper plate. Backoff the screw acting as the set screw on the shaft coming out of the gearbox.. and the two pieces will separate. The lower mounting bracket with gearbox.. and the upper assembly which has the up/down and t-rex himself.
Then you can get to the 4 screws that hold the gearbox in place.
Mariposa, CA
