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Old 06-28-2022, 03:49 PM   #1
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Sharp Microwave died. . . .

Last trip of the year in 2021 revealed that our Sharp R-1874 convection microwave was inop. Weíve had our rig in for the replacement of the second ac since 1 May (the first was replaced last summer), and just got it back so started troubleshooting the microwave.

- Breaker not tripped
- 120v voltage at outlet
- disassembled microwave panel, fuse checked OK
- A+B+C = microwave is shot.

Itís a 2005, so I have no problem believing it has reached itís useful life.

So I order a new unit from Home Depot ($600) itís here in 24 hours, so I go to install it today. Step 1, I plug the unit in, start the gen, and no joy - no power. So I go back to troubleshooting

- breaker not tripped
- instead of my multimeter, I insert a plug-in voltage meter to the outlet (itjust shows volts), NO VOLTAGE

- I plug in the tester to other outlets and they all show 120 v
- I plug back in to the microwave outlet, and no voltage. I twist the tester to pull it out and 120v indicated!?!

It appears the outlet is bad with an intermittent fault. Would have been nice to have figured this out before buying the new unit, but who is going to second guess a Fluke multimeter?

Iíll be replacing the outlet tomorrow, but lesson learned
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Old 06-28-2022, 07:01 PM   #2
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ME! I hated the Flukes the shop had because I was always the one that got to work on them when they came in not working right. Pieces of crap on the inside. I wouldn't have a Fluke if you paid me to take it. Must have fixed a least a hundred of those unreliable scraps of garbage in my career.
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Old 06-28-2022, 07:15 PM   #3
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Don't like Fluke meters myself. Years working in the service and repair world I found them not reliable. Sperry, Greenlee and of course good ole Simpson. Even have a Heathkit VTVM (vacuum tube volt meter) that I still use on the bench. Ya I know I'm old.
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Old 06-28-2022, 07:37 PM   #4
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I owned a Dumont VTVM for decades. Really liked the visual and accuracy of that big meter movement.
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Old 06-29-2022, 05:48 AM   #5
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Yeah, I canít blame the Fluke - the ďsnap togetherĒ outlet was never assembled together properly, so the white wire was never seated in the two slice conductors that hold the wire firm. I donít know how the thing worked for 17 years.

I clipped the wires (leaving plenty for the new outlet) and will install this evening when the new outlet comes in.

I have my Dadís old Simpson - itís what I grew up using - but I donít want to tote that baby around anywhere!
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Old 06-29-2022, 08:49 AM   #6
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My old mentors always said "A good craftsmen never blames his tools." Fluke has made some of the best and most sophisticated measuring devices for a hundred years. They are often more expensive, but do much more and do it better.

I use a cheap no-name $15 digital multimeter. I have three and test one against the other as needed. I had access to the NIST in my previous professional life.

The issue in this thread is troubleshooting technique not the voltmeter. If life and death were on the line, further troubleshooting to verify conclusions would have been justified.

In this case, only money and preparing dinner was on the line. Intermittent failures are the hardest to diagnose. Using the first indication without verification is normal shop practice.

I wish you all good luck and happy trails ahead!
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