JES739WD - Instructions

Everything worked on the display light inside worked but when you closed the door and set time it would start counting down but not heating nor would the turntable turn. Started reading troubleshooting chart and first thing I did was removed the cover and checked door switches and found primary door switch wasn't working so I ordered a new one installed it and it worked. Anyone doing this has to be very careful because of the stored energy in the capacitor is strong enough to kill.
My micro is only 2 years old so I was hoping it wasn't anything major.

Removed micro bottom - 5 screws. One screw on the motor and a clip. Reversed the sequence, turned it on and watched it turn.

I REMOVED THE TOP PANEL OF THE MICR0WAVE AND THEN REMOVED ONE SCREW TO REMOVE THE CONTROL PANEL. rEMOVED OLD SWITCH. SNAPPED IN NEW SWITCH AND CONNECTED WIRE. REPLACED CONTROL PANEL AND UPPER PANEL.

Remove 2 Philips Head screws on left side of microwave. Remove 3 Philips Head screws from bottom rear of microwave. Remove 4 security screws from back of microwave (holding the cover to frame). These are the security type tips that are like a Torx bit, but need to be hollow in middle to accommodate pin in center of screw. Then back plate of microwave with heavy transformer still attached slides up and away. The wires aren't long enough to allow it to rest flat on the bench, but weight is low so it's easy to hold it upright while removing the motor unit. Separate connector from motor (simple) Remove motor by unscrewing 1 phillips head screw and rotating counter-clockwise a tiny bit. Remove Motor. Reverse steps to re-assemble. Note that there are a series of tabs at the bottom of the back cover that fit into holes in the baseplate of microwave. It can be a little tricky to line them up with the weight of the transformer, but it's not too bad. Once lined up, it drops in nicely and all the various screw holes line up. The microwave is a bad cooker when the plate doesn't spin. This simple and inexpensive fix saved me from having to buy a whole new oven.

Removed the MW from the wall. Took the top screws off the air vent. Then removed the two screws holding on the display. I then moved the display to its side and it revealed the micro switches. I removed the plug in leads from the micro switch one at a time. I did this with all three micro switches only one at a time. I reinstalled everything and plugged it in. No more fans starting when the door is opened.

Removed outer cover

removed lower door switch

installed new switch

Wa La!

Turned the microwave on its side. (Recommend turning it on its top. i had to fish the wire connection back to the center after it dropped away from the motor.) There is a spot under the rotation motor where an access port was stamped in the tin but not cut out. Used the small side cutter to complete the cut where tin had been left between holes. I unplugged the wires, removed the old motor by removing one screw, and installed the new one by reusing the same screw. The motor must have a reduction gear inside the case. The motor coil tested good, about 128 ohms, but it acted like there was a stripped gear inside. I wasn't interested enough to try to open the motor and confirm.

Had to go to the garage and get a small sheet metal screw to close the new trap door.

The "new" motor had scratches on it, made me wonder if it was really new, but it works fine and will probably outlast me.

To remove the outer cover of the microwave you have to unscrew 7 or 8 Phillips screws but most of them have "secure" type heads, so you need a driver with a hole in the middle, to fit over the pin on the screw head. I had one of those already, so it wasn't a problem. The metal cover is slid between rubberized strips on the front face of the enclosure and needs to be lifted and tugged out quite firmly in order to release it. Once the cover was removed, the bulb can be seen attached to the main frame of the microwave by a soft metal lug that can be bent back by hand to release the bulb and its integrated holder. The wiring harness simply pulls off of the bulb prongs and there you have the charred remains of the original bulb! I tried every appliance store and hardware store in Bismarck, but nobody had this part. When I typed in the serial number on the bulb, Partselect's site came up with exactly what I needed. Replacement was a simple reversal of the process, making sure not to over-tighten the sheet metal screws on the cabinet. Voila! We have light beams again. Thanks Partselect.

unplug oven from power
remove glass turntable
remove cabinet housing
remove burnt out bulb
order correct part
reinstall new bulb
reattach cabinet housing
install glass turntable
plug into power outlet
confirm light bulb on

get microwave out of cabinet. Took two people because it was very heavy. Used special hex drive socekt because of dimple in the female nut.

removed the outer case - this was the most difficult part because the microwave is large, heavy, and cumbersome.
once the outer case was off, it was simple - easy to see where the old part was and the replacement was an exact match
it was then just a matter of disconnecting the old burned out part and replacing it with the new one
then wrestling the outer cover back into place and re-fitting the screws.
Microwave is fine now and hopefully good for another 10 years!

DISCONNECT THE POWER CORD and discharge the capacitor
Leave unplugged overnight
Remove vent grille by removing the 2 philips screws
Remove the LED panel by removing 1 phillips screw
Disconnect all connectors that plug into back of the LED board completely
Remove the wires from the switches (3) at the inside edge of the microwave door
Gently remove each switch housing and test all three switches for continuity
Carefully replace non-functioning switches and reassemble the panel
GOOD LUCK

remov cover to check voltage and found problem at the interlock switch ohm the switch and found it was open replace both switches it work fine now

I assumed light was burned out and got a replacement bulb.
Removed back and side screws with slight difficulity.
Was not able to remove cover. The top front would not loosen. I tried every trick in my 80 year repertoire. I gave up and put it back together.
I emailed PartSelect last week explaining the problem. So far no reply.
I am sure I have the right model # and others seem to have little trouble removing the cover.
I paid $85 + tax for the oven and it has worked well for about 8(?) years.
From what I read here, I figured I could handle the bulb replacement.
I'm just out the cost of the bulb and shipping and the oven still works. It would have been nice to have the light work again but we will just wait until it quits working and buy another inexpensive unit.

tested cap. with ohm meter which showed a short. A new HV cap., a fuse and it is working fine again.