Magnetron

Removed outside cover (more than a dozen screws) including top-rear plate and 120V cable strain relief. Swung control panel aside (one screw at top, then lift, pull, and tilt down). Removed inner magnetron volume cover, about a dozen more screws in truly random-seeming locations, and swung aside leaving cables connected. Loosen top-side ... Read more plastic duct work (about 3 screws) to access magnetron nuts and bottom-side plastic duct work (about 2 more screws and a clip to provide clearance for magnetron removal). Disconnect thermostat (2 screws) and power cable to magnetron. Used small socket wrench for 4 nuts to release magnetron and bracket. Changed bracket to new magnetron (2 screws). Replaced magnetron and diode, reassembled everything. Unit seems perfectly functional now. If I were doing it again I'd take pictures so I'd know where all the screws came from.

Remove the microwave and checked the diode, the magnetron and the capacitor to see what was broken I ended up replacing the diode and magnetron put it together and it worked fine Problem is easy to diagnose following Internet instructions