On Sep 8, 11:08*am, msg wrote:
raypsi wrote:

snip

I agree it's not a flyback.

I don't think it's resonant converter because you looky at VK3HZ's
data on loading it, the duty cycle would take it way out of resonant.

Thanks to jimmie for the PDF service manual; inspection of the
schematics shows differences between the block diagram (which
seems to show a resonant configuration) and the inverter detail
schematic (which shows a voltage doubler configuration). There
are also mistakes in wiring runs (circuit box outlines confused
as wires and having cross-connect dots misplaced, etc.). After
accounting for these, the above assumptions seem correct.

A quick web search for inverter microwave ovens seems to yield
only Panasonic models, and the cheapest in my area is $158.00
at Walmart. *To me, this isn't really cost-effective, and they
are too new to be found in the alley. *I intend to continue
to explore utilizing PC PSU parts to build an HV supply.

Michael

The part can be bought as a spare for about $40 or $50 dollars.
I have found a couple of them at Goodwill. I would have be tearing
into it but our 20 year old microwave finally bit the dust so my wife
put claim on this one.
I have also seen them setting on the curb on trash day. On was on my
way out and thought I would pick it up on my way back in. Didnt work
out. Since I started looking for them it seems there are two common
reasons people get rid of old microwaves. One is to have the latest ,
greatest model and the other is because the digital display quits
working. Any sort of failure out of warranty usually means a trip to
the curb.


THESE MUST BE OPERATED UNDER LOAD OR THEY WILL SMOKE.

At least that is what happend to mine.

Jimmie