Hi guys, hope someone an give me a little help here. I bought a broken microwave with the intention of fixing it. The output to the HV circuit is working and after some investigation I found a HV fuse that had blown that was in a plastic carrier under the fan. Anyway I decided to order a new fuse and diode which is strapped across the case and the 2300v cap. Before I replaced these items the microwave hummed normally and it appears to work but there was no heat. Since replacing the fuse - i think the diode was OK - it now make a very loud buzzing noise when on and still no heat. I have tested the Magnatron and it tests as it should with a DMM. I have tested the Cap and it also tests as it should with the modest Cap test on my DMM. It also has no short to case and the discharge resistor is also testing out as good at 10MOhm. In short I now don't know which component Transformer, Magnatron or Cap could be bad. Any help appreciated. I have a Multi Function 1000v tester at hand could I use this to test the components further for breakdown under high voltage?
Thanks
James
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Hi,
I recently picked up a used Matsui 175S microwave that was powering up (starts, turntable rotates) but not heating. From looking online the most likely culprit was the fuse, but unfortunately in this one the fuse had heated up and fused with the (badly designed) fuse holder and couldn't be removed. I guess this might indicate further issues beyond the fuse itself but at this stage I just want to replace the fuse and see how I go from there.
Anyway since I couldn't get out the fuse itself the easiest fix was to replace the fuse holder assembly that runs between the... -
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