The light bulbs on the above stove inverter

I've seen this with most microwave ovens I've had. When the microwave emitter kicks in to cook, the unit uses much more power, providing less to the internal bulb, which dims a bit. Unless it's very dramatic, for example the bulb turning off or going almost out, it's normal behavior. If the bulb is going very dim or out, it could be that the circuit it's connected to isn't providing enough amperage to adequately run the oven. In the case of your microwave, it's rated at 15 amps, so should have adequate power on a standard household circuit by itself.

According to ehow it looks to be under the left side and a 30w bulb

http://www.ehow.com/how_7614605_replace-chef-microwave-light-bulb.html

If that is the little bulb that lights up under the unit: http://www.partselect.com/PS2351821-GE-WB25X10019-Halogen-Light-Bulb-120V-20W.htm?SourceCode=5&SearchTerm=JVM1790&ModelNum=JVM1790

Either the wrong bulbs or just bad ones. The oven only gives it the 120 volts. It won't be the microwave oven. Just bad bulbs

Try to get the bulb number off one of them (usually printed on them) and Google for a source in your area.

According to the GE manual it is a 120 v 20 watt halogen bulb, the GE product number is WB36X10213. That is the cooktop light/nightlight that would be on the stove hood. HTH!

Normally they would unscrew. First, always be sure to unplug the power before installing or removing bulbs.

They may be tacked in with some hot glue.

hello,

the closest place to you is Accufix Appliance Service‎ 29 Skyridge Road, Toronto, ON M1E 4N7, Canada (416) 283-7447‎

Thank you and thanks for using fixya.

Since you obviously intend replacing the bulb yourself (good for you!) you should first remove the old bulb and that will make it easier to find a new one. Chances are, its a common bulb, readily available wherever light bulbs are sold. Or, at the very least, a hardware store like Tru-Value or Home Base.