- Bad Magnetron in microwave oven? - 4 Updates
| Jesse Bear <rangerssuck@gmail.com>: Dec 05 09:17AM -0800 My over-the-stove microwave oven stopped cooking. Here are some facts: 1) it is over 20 years old 2) Every now and then, it would make a ticking noise and not cook. Turning it off then on again, would clear that problem 3) It now goes through the motions of cooking, and sounds normal, but it doesn't cook. 4) The capacitor, diode and transformer appear to be OK. Capacitance is within spec, meter reads about 10Megohms (internal bleeder). Diode conducts in one direction only. Measured about 3KV DC between case ground and magnetron (Yes, I have a high voltage probe and know how to use it - I used to work on 50KV power supplies). 5) Magnetron measures almost zero ohms across filament and open circuit from filament to ground, which all I've read says that's a "good" magnetron, but the oven simply does not heat. So, with all that said - good cap, good diode, 3KVDC at the magnetron - what's going on? *Almost* every fiber of my being says "MAGNETRON," but am I missing something? I would truly like to get this done and back on the wall. Thanks. |
| John Robertson <spam@flippers.com>: Dec 05 11:55AM -0800 On 2021/12/05 9:17 a.m., Jesse Bear wrote: > magnetron, but the oven simply does not heat. > So, with all that said - good cap, good diode, 3KVDC at the magnetron - what's going on? *Almost* every fiber of my being says "MAGNETRON," but am I missing something? I would truly like to get this done and back on the wall. > Thanks. I bought out a Radio/TV/Microwave distributor (Main Electronics - Vancouver, BC) and have some boxes of NOS microwave parts including Magnetrons. If you have a part number I may be able to help you...if you can't find it elsewhere. As for testing - for that I would suggest seeing if you can find a service manual which should provide you with voltages needed to verify the power supply is running OK. Try this repair resource: http://repairfaq.cis.upenn.edu/sam/micfaq.htm John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| "tschw...@aol.com" <tschw10117@aol.com>: Dec 05 04:48PM -0800 Have you checked the door interlock switches? I had one that was misadjusted on a brand new microwave. It pretended to cook but no juice. |
| legg <legg@nospam.magma.ca>: Dec 06 07:36AM -0500 On Sun, 5 Dec 2021 16:48:17 -0800 (PST), "tschw...@aol.com" >Have you checked the door interlock switches? >I had one that was misadjusted on a brand new microwave. It pretended to cook but no juice. You wouldn't find an interlock switch in the 3KV rail. RL |
| You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com. |
No Response to "Digest for sci.electronics.repair@googlegroups.com - 4 updates in 1 topic"
Post a Comment