My miro wave quit.?

Then buy a new microwave I mean it isn't rocket science

If you reeeealy liked that microwave, you could try opening it up and looking for the fuse.  Long ago I read that like 7 out of 8 times it's a blown fuse, el tiburon enojado was on the right track, only, If you don't know what you are doing there are capacitors that might light you up, and as they wrote in their article, the capacitor shock isn't going to kill you or even really hurt you, but you are likely to slice your hand to ribbons on the razor sharp heat sinks when you reflexively jerk it away from the shock, because none of the components inside a microwave are made to be accessible to the public!

  You can turn it into a tightly sealed breadbox, or I'm thinking it is probably an almost perfect Faraday cage.  You could put a multiband radio, maybe a handcrank radio, some batteries, a calculator a burner phone and a few gadgets, memory sticks full of photos, and a few other things in it, put it under the house in a dry spot, ground out the electrical cord to an earthed ground rod.  if the chassis (metal frame) isn't directly connected to the third prong, you could run an extra grounding wire to the rod.

  There.  Now you have an E.M.P. resistant technology locker.  It seems as though if it can keep a thousand watts inside of a cubic foot, it ought to keep out a microwave pulse.  A lot of these other guys are flip about your old microwave, and it may have been special to you , but when my old Sharp '98 crapped out I got a nice Emerson with a top browning&pizza feature, that I rarely use, at walmart for about eighty bucks, and so far so good! 

Just get a new one, easy.

Are you aware that microwaves didn't really start appearing in people's homes until about 1982? That means that yours was one of the first. And as such, it's obsolete now. You can't get it repaired. New ones cost less than $70 in a lot of places--those that were bought in the early-to-mid 80s probably cost nearly $300!  Buy yourself a new one. That one is toast. It's been almost 40 years since it was new and there is probably no one who even CAN repair it. 

If it I that old, replace it. No parts will be available to fix it and it is way past it's useable life.

Depends on what's wrong with it. If it's just the fuse then replace that and carry on. Otherwise I'd get a new one, they're very cheap now and probably better.

Just get a new one. Probably better anyway

Like a television, stereo, or many other products:  the cost to repair will be more than a new one.

Enjoy the satisfaction of having one last that long !!!

Get a new one, microwaves are so cheap now. You can get a decent midsize for around $100.

The thing is 34 years old. It was obsolete 20 years ago. Replace it!