daniel116 wrote:One of my DCs has a broken GD rom
it does half a spin and then stops and it stops the system from starting.
I tried moving the GD rom to my other DC and it didn't work so I'm sure the problem is with the GD rom not something else.
What do you think I can do?
When you say you moved the GD-Rom to your other DC, do you mean you moved the entire unit (with the underlying GD-Rom control board)? If it's the former, then you haven't yet eliminated the GD-Rom board from the equation.
Some DCs (model 2) actually don't have a separate GD-Rom controller board. Instead, the controller is integrated into the main board.
If you don't have a multimeter (shame on you!) and want to narrow it down further to either the motor or the board, you can try to swap just the top half of the motor/laser housing (the part that 'floats' on the rubber bushings) with one form a known working DC. To do so (if you have a 'normal' DC with the separate GD-Rom board) you need to remove all the screws from the aluminum looking piece on the underside of the GD-Rom unit (2 are hidden under a strip of adhesive fabric near the back). After that, the underside can be removed and the board inside will be free enough to safely unplug both motor leads, and the laser ribbon. Repeat with the working DC, and swap the parts. If you have a DC with the integrated main-board GD-rom controller, you will see exactly where all this stuff plugs in as soon as you remove the top of the DC... No more unscrewing required.
Hopefully, it's the motor, because that's going to be a heck of a lot easier to repair/replace than the GD-Rom controller.