JVM1842BD002 General Electric Microwave - Instructions

Turned out the issue was easily solved by replacing a single, inexpensive fuse.

First off, UNPLUG THE MICROWAVE.

The fuse is located under the plastic grill at the top of the microwave. It's held on by two screws. Once you've removed the screws and taken off the plastic grill, you go to the right side of the microwave and remove another screw that holds a small metal grill in place. Removing the small metal grill is probably the toughest part of this repair. You kind of have to rock it back and forth a bit to get it to release. Once that's off, you can get to the fuse. I removed the burnt out one with a pair of needle nose pliers. I also put a small piece of cardboard under the fuse when I did this so I didn't accidentally drop it into the innards of the microwave. I did the same thing when I replaced the new fuse. I then plugged the appliance back in and made sure it worked. Once that was confirmed, I replaced both grills.

Manually with no tools

First I unscrewed the screws that were holding the panel underneath. Then I removed the panel and removed the screws that held the turntable motor in place. Then replaced the old motor with the new and screwed everything back into place.

Above the stove mounted microwave. I dropped the lens cover from under the bulb and tried to remove the bulb. The bulb separated from the base. I tried to remove the base with a pliers and the lamp socket broke. I ordered the parts and dropped the bottom cover of the unit down (5 screws). Removed 1 screww from the lamp socket, unplugged the wires and took it out. Simply replaced socket, fastened bottom cover of microwave, installed new bulb and closed lens cover.

First I unplugged the microwave. :) Then, I removed the 6 screws found underneath the microwave, which allowed the bottom piece to hang down so I could see the turntable motor. I took the two screws out holding the motor in place and pulled the electric connectors off the motor terminals. Then I got the new part from PartSelect.com, replaced the electrical commectors, fit the motor back into the slot it came from (cause the pin has to be seated up in the hole) and replaced the 2 screws holding in the motor. Then I put the bottom metal piece back up and put the 6 screws back in. It was really easy - and I'm a chick! ;)

At first I tried to use pliers to unscrew the base,very uncomfortable working position,upside down and backwards(the microwave is installed over the range top)very limited space for your body and arms to manuver and you really cant see the base,all of this took place after the breaker was turned off ofcourse,finally figured out that you can drop the entire bottom housing of the microwave by unscrewing 6 screws and the light sockets are easily accessable once you lower it,take out 1 retaining screw ,remove the entire socket and unscrewed the broken base and replaced the bulbs,I said bulbs,there is no sense in having to replace another bulb in who knows how long since only one had burned out but they were both the same age

Had to take unit off wall and disassemble the main casing.then disconnected the wires from the magnetron.took the mounting nuts off but wasn't able to remove the magnetron until I loosened the transformer out of the way .Then it came out easy.Installed the magnetron ,tightened the nuts,installed the transformer back in, connected the the wires back on and installed the casing on ,screwed the screws and got help to install the unit to the wall again.....Tested the unit before putting back on the wall to make sure it heated....The parts were exac same type and wasn't too hard to do...

Unscrewed bottom plate of microwave and two screws that secured motor. Disconnect wires. Reversed process when installing new motor. Couldn't have been easier.

Follow directions in the manuel, but getting the grill off to get to the where the filter goes was very difficult, the springs kept poping around. Finally got together. This is the 2nd time I have replaced this grill, don't remember it being this difficult before.

The tray drive motor arrived quickly. I opened the package and made sure the correct motor arrived. I shut off the power to the microwave/exhaust hood. Then I grabbed a screwdriver and dropped 5 screws from the bottom of the microwave. I then removed 2 more screws that hold the motor in place. Unplugged the 21 volt power clips. Placed the new motor in position and replaced the screws and attatched the power clips. I then placed the bottom pan in position and replaced the 5 screws that hold it to the bottom of the microwave. Turned the microwave on and it worked properly! The total cost was $40 and I probably saved more than a hundred dollars on a service call. What a happy ending and it took about 5 minutes to perform the repair! Thanks PartSelect. You are the best!

Unplugged the microwave first, then removed the screws that hold the cover in place. This gives easy access to the socket. Remove the screws that hold the socket in, unplug old socket, replace with new one and you are back in the light again.

This coupler has a tab on it that keeps you from being able to push it straight down onto the motor from the inside of the microwave.
Turn off the breaker to the microwave or unplug it. Remove five screws that hold the bottom cover of the microwave. The cover will hinge down and hang on tabs at the back.
Unplug the wire connector on the drive motor by pulling it straight off. Remove one screw that locks the drive motor in place. Turn the motor slightly to unlatch it from its mounting tabs.
Place the new coupler into the opening inside the microwave. While holding/turning the coupling with one hand, insert the motor shaft into the coupling. It will only fit one way. Press the motor and coupling together until the motor can be latched into its mounting tabs. Secure motor with screw and install bottom cover.

Inserted new greese filters by unscrewing fan and light holder over range. The new filters were 1/4 inch shorter than older filters and are loser than the original filters, but they will work. Not sure if I inserted them correctly, and would like to see instructions on how to insert filters of that type. Thank you for your fast and curtious service.

Over the range microwave. Replaced magnetron. Completely disassemble the case top and bottom.
Remove screws from bottom of HV transformer. Magnetron will not clear without this removal.

Remove nuts with socket from top of Magnetron. Remove thermo unit from old magnetron and attach it to new. Replace and bolt down Mag. Replace and screw in HV transformer. Make sure all wires are reconnected.

Put it back up on the wall. Took about three hours from taking it down from wall and putting it back up.

There are 4 thermostats (aka TCO = Thermal Cut Out) in the GE JVM1440BH04
The schematic is under the cover in a black envelope to the top left of the unit if you face the door.

Check the fuse first. You can remove the front grate, then the numpad on the right. The fuse is right behind it. It's a 250V 20A Class F fuse.

There are four (4) TCOs or Thermal Cut Out thermostats in this puppy:

1) There is a thermostat behind the button panel to the left, facing down. If blown, it breaks the power coming into the unit and will cause a no power situation.

2) There is another TCO or thermostat near the top lamp, to the left, in a small cavity. That one also breaks power to the unit and will cause a no power situation. It's a 100 C / 0 C thermostat. This was the one that blew on me after I left the stove running (for heating in a black-out) under the microwave.


"Cavity TCO" or "Thermostat" part number 61 on the schematics, part number PS239319


3) There is yet another power-breaking TCO or thermostat in the cavity behind the fan that cools the microwave coils. You have to remove the sheet metal on the right of the microwave to access it. This one also breaks power and will cause a no power situation.

1), 2) and 3) should test out to be 0 Ohms with a resistance meter (Digital Multimeter) if working correctly.

4) There is a thermostat which normally does not let current through it. It is mounted in a vertical position to the back wall behind the front panel on the right. This one is used for the sensor reheat function apparently and will close when the temperature in the microwave reaches approx. 60 C.

4) should have infinite resistance with a resistance meter under normal circumstances.