Repair and disassembly guides for GE Microwave ovens.

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Are all microwave oven diodes not the same?

Okay so diodes depending on what brand they are "made for" such bs, range in price between $3 and $40

Are all microwave oven diodes not the same ? I'm looking at replacing one in a 900watt and a 1000 watt microwave oven. Can someone advise on specs ? Price variance due to simply parts sellers markup?

What the big deal with capacitor discharge and voltage? Obviously a insulated screwdriver or insulated needle nose pliers touched to bridge negative and positive will discharge the capacitor. Obviously appliance is unplugged and not running. There is more technical way to discharge capacitors but you still have to short the +- to be sure. Most people just short out across terminals.

Testing components directly has always been the way to go. Guessing based on current draw seems like looking for water with a divining rod . I'm sure it works for those thr do it. Quick diagnosis shortcuts are always appreciated

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Hi,

The big deal about capacitor discharge and voltage is that not everybody knows what they are doing and why it has to be done in certain ways sometimes. Not their fault, they just haven't been trained. Because of this they may injure themselves and they could also create more damage in the appliance.

They think that electrical/electronics repair is easy. "It's probably only a fuse", simple. The litany of problems caused by DIY repairs in this forum is proof that it is not as simple as it sounds

Shorting out a high voltage capacitor incorrectly could possibly lead to sparks flying causing flash blinding. If not using the appropriately insulated tools could lead to electric shock and depending on the person's medical condition could even be fatal.

One example that I've seen is a screwdriver welded across the capacitor terminals because it wasn't big enough to handle the current flow and melted. They just heard "short it out with a screwdriver" and grabbed the first one to hand. As you can see what may be obvious to you is not necessarily obvious to somebody else.

The correct way to discharge a high voltage electrolytic capacitor is to connect the +ve terminal to chassis Earth via an appropriate high value resistor (MegOhm), with the correct power rating. to limit the amount of discharge current flow. Then when satisfied that it should be mostly discharged apply a s/c across the terminals to doubly ensure that it is.

Sounds unnecessary but not only is this the safe way to do it, it also prevents possible damage to the capacitor due to high surge current flowing.

It only takes a few minutes but I guess impatience wins out, hence the screwdriver

The fact that you can get away with using a screwdriver is testimony to the robustness of the component but again all are not equal.

Update (04/06/2018)

Hi,

To my knowledge there is no "standard" diode for microwave ovens.

I would have thought that their rating will differ depending on the design of the circuit.

I'm not in the repair business and have only replaced 2 diodes in my time, whilst fixing microwaves as a favour. More often it is the turntable drive motor or the control panel that I've had to deal with.

I just used what the microwave oven manufacturer listed in the parts section. After all they know their product best.

As to the price, once you know the diode specs (or type number or equivalent) you can search online to find suppliers and also the manufacturers (brand) of the diodes. (Try mouser.com, farnell.com, element14 -I'm sure you have your own preferred suppliers). Knowing the manufacturer (brand) is sometimes helpful as you can then check their "reputation" to see if their components are quality products or just so-so, This used to be the case with capacitors as you're probably aware.

It may be that it is better to pay a bit more for a part if you know that it is going to last the distance rather than have it fail prematurely because the quality is not there.

Sorry that I cannot be of more help.

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I’m impressed Jayeff!

Hi @ladytech ,

Thanks (he said blushing).

;-)

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Yes makea sense I've run into many who think that whatever they can get away with is the correct fix.instead of acquiring the tools and education required. One of my clients changed a dvdrw drive as computer was running another a expansion card. There is no end of ....

My Question:

So I've never repair a microwave oven only tv's and entertainment related consumer electronics .

Is there a standard diode

Or

Do they have values depending on microwave power output rating ie 900w 1000watt?

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Does the microwaves power rating not govern the specs then (of the diode)

Or 900 watt oven has a lower rates diode and all the ones for such are similar rating even if different ways to install?

Obviously a 1300 watt one would have different spec. Or can they be completely different spec even in same power rating?

Hi,

I don't know but would think that the individual circuit design would decide what particular diode to use. You would have to look at "all" the specs for the diode not just their voltage rating.

Here is an example

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I used to repair cardiac defibrilators and we discharged the giant capacitor used in them with a high voltage probe, The high voltage probe was originally used to measure the CRT votage on the side of a CRT. It looked like a long plastic wand with a metal tip and plugged into a dvm. It had very high resistance so it could bleed down the voltage slowly.

Here's one on amazon: https://smile.amazon.com/Precision-PR-28...

As crts are rare you might find one cheap now.

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