What is the power on my GE Spacemaker JVM1631BJ03? 900? 1000? What? I can't find it anywhere on the machine. (It's installed in a house I just bought.) Thanks

Take model # to searspartsdirect.com. They typically have manuals in parts listings.

house circuit breaker tripped?

Remove a GE Spacemaker
The GE Spacemaker series of microwave ovens are designed to be installed above an oven range, freeing up counter space in your kitchen. Some of these Spacemaker models are connected to an outside venting system to carry kitchen vapor and odors outside. Other Spacemaker models utilize a ductless system to do this. Removing a GE Spacemaker microwave oven isn't a difficult task, but, because of the size of some of the oven models, it is a two-man operation. Have a question? Get an answer from an appliance repair specialist now!

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Things You'll Need

• Assistant
• Sharp knife

• Phillips screwdriver

Instructions

1. • 1 Open the cabinet above where the Spacemaker microwave oven is installed. If you see a vent in the cabinet leading to the Spacemaker oven below, your Spacemaker is vented. This vent needs to be disconnected before continuing with removal. Disconnect the vent either by loosening the duct clamps or by cutting the duct tape away with a sharp knife. Pull the vent out of the top of the oven.
     
   • 2 Have an assistant support the oven from below. Loosen the mounting screws connected to the Spacemaker through the cabinet bottom. Loosen the screws by turning counterclockwise with the Phillips screwdriver.
     
   • 3 Unplug the Spacemaker from the socket in the cabinet.
     
   • 4 Continue loosening the screws while your assistant holds the oven in place. Once the screws are removed, have your assistant slowly lower the Spacemaker down by lowering the front face at a 45-degree angle.
     
   • 5 Feed the power cable for the Spacemaker through the hole in the bottom in the supporting cabinet.
     
   • 6 Help your assistant slowly pull the Spacemaker forward and out of the mounting brackets on the rear wall. Once the Spacemaker is cleared of the mounting cabinet and rear wall, set it down.
     
   • 7 Remove the mounting bracket from the rear wall by loosening the screws.
     

Read more : http://www.ehow.com/how_7344250_remove-ge-spacemaker.html

I would check the house wiring to the appliance. There sounds like maybe a bad connection.

your power transformer for the magnetron could have a shorted primary power winding,the door safety interlock switch could be mis-adjusted,this normally blows the internal unit fuse,a shorted high voltage capacitor,or diode,a bare wire inside the unit,more than the microwave on that circuit or a weak circuit breaker in the house power panel

Manual for installation/daigrams are available at FixYa site .

Her is a link that I hope with work that shows the bracket and how it was installed.

PDF]  JVM1850BH/CH/SH/WH – GE Spacemaker Over-the-Range Microwave Oven File Format: PDF/Adobe Acrobat - View as HTML

yes there is. the fuse should be located behind the vent grill on the right side above the control panel. there may be a metal "grate" covering the access to it

I'm guessing that's JVM1870SDF04. While there's a chance it may be the magnetron, but I do suspect the high voltage transformer.

The magnetron would still be covered under warranty, but you would have to pay for the home visit ($75 avg) and the labor to replace the part ($90 avg).

The transformer is just over $100 here and about $165 direct from GE.

You can save about $75 in labor by taking it to the shop yourself and for their bench fee, you can get an estimate and find out if it;s the mag or the transformer.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download GE owner's manuals and installation instructions here.

GE Customer Service is here and they can point you to your nearest GE-authorized servicer.

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

Either the magnatron or the high-voltage capacitor and diode. Replace the capacitor and diode then if still not working, replace the magnatron. Its only affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!