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Samurai Appliance Repair Man's Blog



Using a Test Cord to Diagnose a Microwave

Posted by Samurai Appliance Repair Man, in Microwave Oven 01 December 2012 · 722 views

A powerful troubleshooting technique when working on microwave oven that won't heat is to split the problem in half to determine if the problem is coming form the low voltage side or the high voltage side. A test cord can be a very useful troubleshooting tool because it allows you to so just that. Sublime Master Chat_In_RI enlightens us on this technique:


Why can't you make a test cord to power the M/W?

No model number here, but a test cord to the primary side of x-fmr to by-pass door switches, relays, etc... and if your diode and cap check out OK, narrows it down to the mag if no heat.




Source: GE Double Oven Microwave not heating


How to Make a Resettable Fuse Tester for Testing Microwave Ovens

Posted by Samurai Appliance Repair Man, in General Appliance Repair Wisdom, Microwave Oven 29 September 2012 · 1,564 views
microwave, oven, fuse
Academy Fellow CTG51 graces us with another of his clever appliance repair gizmos...

A handy item if you test a lot of microwave ovens ( or other fuse eating items )... Make a resettable fuse tester...................
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and with easy to find parts
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......Makes a good ( safety ) jumper in case you jumped the WRONG wires.... :woot:



Source: do not waste fuses.....


How to Fix a Dead GE Advantium Microwave

Posted by Samurai Appliance Repair Man, in Microwave Oven 14 July 2012 · 2,145 views
GE, microwave, advantium and 3 more...
A fantastic tech post from Brother in The Craft, binthere222:

In my case, I have found the easy solution to the numerous "Dead Advantium" posts I have seen. This seems to occur with amazing frequency, when power is available, but nothing comes on at all. GE sure doesn't make it cheap to fix and it seems that ALOT of excess work is done when all it takes is the replacement of one little item.

It was an easy fix to remove the control panel and then the Thermal cutout fuse shown. Once replaced, All the lights came on and it started to work again, No problem.

The Thermal Cutout Fuse is heated by air exhausted from the cooking chamber of the oven. If there is a food fire or other other overheat condition, this fuse is supposed to temporarily open, Thereby bringing all operation of the oven to a DEAD STOP. Emphasis on the DEAD, i.e. electrically dead. Problem is, these little fuses are poorly designed/constructed such that they will remain open when they are supposed to close as the oven cools off.

UNPLUG THE UNIT FROM HOUSE POWER BEFORE DOING ANYTHING !!!!!

1. There are two screws pointed straight down above the upper grill. Remove those with a phillips screwdriver, then pull the grill off.
2, One stainless screw is now revealed above the center of the control panel. Remove it and then slide the panel up 1/2 inch by pushing/tapping up from the bottom of the control panel then lift it out.
3. There will be less stress on both you and the equipment if you just remove all wiring harness plugs from the rear of the control panel.
4. You will then be able to see the offending cutoff fuse secured by one screw to the floor of the controls cabinet just behind where the control panel sits. Test across the two terminals. If you get no continuity or anything more than ZERO ohms, then replace the part because it is not providing a closed circuit EVEN THOUGH THERE IS NO HEAT CONDITION PRESENT.
5. Remove the two white plastic insulated spade plug connectors, then the one screw and lift the part out.


This Shows the General Location of the Fuse at the bottom center after the control panel is removed

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This shows a closer view of the Fuse

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This is a view of the aluminum bottom of the fuse

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When the fusebottom is removed the mechanism is revealed.

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The small purple stick is made of a ceramic or plastic which expands slightly when heated. One end of the stick touches the aluminum, the other end pushes against a flexible brass strip (at the small dimple in the center). This causes two contact points to separate, thereby opening the circuit. The contact points appear to be oxidized from the presence of heat, DUH !!! and dampness from cooking food.


You can buy the replacement thermal cutoff fuse here ==> http://www.repaircli...21X10046/769674


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

Source: Dead GE Advantium Microwave Solution, Thermal Cutoff Fuse



How to fix an LG LMVM2055 microwave oven that won't start and has a dim or partially lit display

Posted by Samurai Appliance Repair Man, in Microwave Oven 16 March 2012 · 1,172 views
LG, Microwave, Oven
The display that shows the time, countdown, etc. is an integral part of the control board. To fix this, you have to replace the entire control board.

Control board part link ==> http://www.repaircli...mber=LMVM2055SW


Source: LG LMVM2055 Microwave misbehaving - won't microwave






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