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Troubleshooting a microwave oven using the Divide and Conquer Method

Posted by Samurai Appliance Repair Man , in Microwave Oven 26 February 2012 · 2,170 views
microwave, oven
Electrically speaking, microwave ovens have two sections: low voltage and high voltage. The low voltage section consists of the door switches, start button, control panel, turntable motor, cooling fan, stirrer motor, and some miscellaneous switches. The high voltage section consists of the transformer (which steps 120vac line voltage in residential units and 240vac in some commercial units up to 2,000+ volts), the high voltage rectifier (diode), and the charging capacitor (which together with the rectifier doubles the output of the HV transformer), and the star of the show, the magnetron. You can see pictures of all these parts and where they're located in typical microwave ovens in these spiffy, interactive diagrams:

Detailed Countertop Microwave Oven Diagram

Detailed Built-in Microwave Oven Diagram

Lots of times, when you're troubleshooting a microwave problem, it's helpful to figure out early on whether the problem is in the low voltage section or the high voltage section because this narrows the problem down considerably. Professional Appliantologists call this the Divide and Conquer Method of Troubleshooting and it is a very powerful technique indeed. At this point, I'll turn it over to Academy Fellow Budget Appliance Repair (Willie), Professor Emeritus of Appliantology, to explain this sublime troubleshooting kata:

One way to test this is to remove the ?black (L1) power wire from the high voltage transformer, or both wires going to the the primary 110 volt side of the high voltage transformer if you can't figure out which is the line and which is neutral, (be sure to tape them safely away from touching anything).

Then turn the microwave on and it should startup and count down and cooling fan should run, just won't do any heating, (by disconnecting the high voltage transformer you have completely eliminated the high voltage system from the picture). If this works OK then you know the switches and complete control circuit is OK.

If the test with the high voltage system disabled above works, next reconnect the transformer and disconnect the two wires going to the mag tube, (make sure to mark the terminals they come off of), and make sure they are safely away from everything and give it another try. If again it works without blowing the fuse you can be pretty sure you have a bad mag tube, even if it doesn't show as a directly shorted mag tube when checking continuity from the terminals to the mag tube case.

After you've applied the Divide and Conquer Method to figure out what's wrong with your microwave oven, you can buy the parts with a 365-day return policy here ==> http://www.repaircli...rts?RCAID=24038

Source: GE Spacesaver JVM1441BH04 Microwave continually blows fuse after slamming door


Look out Fukushima: here comes Magnetron Meltdown!

Posted by Samurai Appliance Repair Man , in Microwave Oven 13 January 2012 · 2,572 views

Here's a great shot from Master Appliantologist RussTech of a magnetron that's gone into full meltdown.

Posted Image

Source: From: Bad Magnetron


How to troubleshoot and diagnose the high voltage system in a microwave oven

Posted by Samurai Appliance Repair Man , in Microwave Oven 03 January 2012 · 2,418 views

If you're troubleshooting a no heat problem in a microwave oven, the first thing to check is the door interlock switches.

Posted Image

If those check out good, then you're off the high voltage circuitry in the microwave. This video will show you how to troubleshoot the high voltage system ==> Download Video (180mb, .mov file)

To learn more about your microwave or to order parts, click here.


How to remove the door and disassemble it to replace the door handle on a Maytag microwave oven

Posted by Samurai Appliance Repair Man , in Microwave Oven 29 December 2011 · 2,036 views

from the 16021668.pdf service manual:
Door Removal
1. Disconnect power to oven and remove grille, (see "Grille" procedure).
2. Open the oven door, slowly raise the door evenly. disengaging the pins at the top and bottom.
NOTE: When aligning the door for assembly, the door must be opened as much as possible.
3. To place door back on unit, place bottom pin into hole first and then align the top pin.
Once pins are aligned push door downward to lock into place.
4. Replace front grille to complete assembly.

Door Disassembly
1. Disconnect power to oven and remove oven door, (see "Door Removal" procedure).
2. Pry away choke cover, by placing a tool in the upper right corner of the door and gently prying outward on the choke cover.
Continue to work around the door casing until choke cover is completely loose.
To avoid property damage, care must be taken when prying choke cover from oven door.
3. Slide latch assembly upward and to the left to release plastic tabs from door frame.
Once latch assembly is loose the spring may be disconnected from the door frame.
4. Remove screws securing door handle and door frame to door panel.
5. Remove door frame by releasing tabs around entire door panel.
6. Remove door handle by placing a hand on door panel next to the top of the door handle.
Twist door panel towards the inside of door and pulling on the top portion of the door handle in a quick jerking motion.
NOTE: When replacing door handle, the bottom portion of the door handle must be inserted first.
7. Slide door glass to the right slightly, then push the door glass upward to release the glass from the track.
8. Reassemble in reverse order.

Once outer door trim panel is removed the glass panel is loose.
A microwave leakage test must be performed anytime a door assembly is removed, replaced, disassembly, or adjusted for any reason.

Part link for the replacement door handle ==> Door Handle

Source: Broken handle on Maytag Microwave MMV4184AAW


Wiring Diagram for a Jenn-Air JMW9527CAB wall oven/microwave combo

Posted by Samurai Appliance Repair Man , in Microwave Oven, Oven-Range-Stove Repair 21 December 2011 · 2,903 views

click on picture
then lower right corner to SAVE or CLOSE
Posted Image

Source: Help! Jenn-Air JMW9527CAB wall oven/microwave combo will not heat

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