I have a GE Spacemaker microwave oven model JVM140001 manufacrured in 1989. I need a plastic dome replacement to cover the microwave element.

Here is a link to download a copy.

http://kitchen.manualsonline.com/manuals/mfg/ge_appliances/jvm140.html

The turntable system consists of the motor, the coupler, the turntable support with rollers, and the tray.

You can see and hear a video of how a turntable motor should sound when you rotate it by hand.

If yours is not set to be off via the control panel, and it won't rotate or it sounds like it's grinding, etc., you may have a bad motor or plastic coupler.

To replace either, you need to unplug power, then remove the bottom cover of the oven.

On some, you have to cut the motor cover off with snips, then use a screw when reassembling it.


You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

Please remove the top cover to find the lamp mounted which can be replaced.
Click on: Bulb

i wont worry about it. it is for grease ewntrapment

Our JE1860SH was also sparking after a few seconds. The GE tech pulled the upper round disk and found the problem. The plastic was burned and the round metal which is behind the plastic dome was arching with the frame. Lasted seven years expected more especially from a GE product. So my suggestion is to remove the dome and check it out.

Could be the fuse inside the microwave is blown. You will need to unplug the microwave and remove the front control panel. Inisde the microwave housing you will need to trace the electrical wire coming into the unit. Usually you will find the in-line fuse located on the black power wire. You can pull the connectors off the fuse and test it with a continuity tester. If the fuse is blown replace it but make sure you use the same amp rated fuse as you removed. If the fuse blows again then there is an electrical short somewhere in the microwave.

The model number should be on a tag as shown in the drawing below.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Here is the GE download page for your manual. Page 35 of your  manual gives the light bulb replacment instructions. 

http://genet.geappliances.com/DocSearch/Dispatcher

You can find helpful exploded view diagrams and order parts by entering your full model number here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

They sometimes have a plastic cover over the bulb cavity that you can take off from the oven interior