Question about Sharp R-7A85 Microwave Oven
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Posted on Jan 02, 2017
A microwave can be dead for many reasons.
The fuse is normally located on the floor of the chassis behind the control panel or between the door switches.
If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.
Then when it cools, it closes the circuit and allows power through again.
When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.
You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.
If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.
If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Jun 23, 2008
The Sharp part number for the oven lamp is RLMPT0003YBE0 (those are "zeroes", not "ohs").
Maybe the generic # is EHKN-122?
You can order the original from Encompass here or you can call them toll-free at 866-779-5835.
Bulbs (and 20A ceramic fuses when needed) can be had locally in most grocery stores, hardware stores, home improvement centers (Lowe's, Home Depot, Builders Square), and big box or department stores like Wal-Mart.
Just take the old one and match it up.
Always unplug a microwave before removing or installing any bulbs.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
NOTE: The FixYa system is not currently notifying me when folks reply to my posts, so please contact me directly with your brand, model and symptoms for more FREE help & do-it-yourself advice.
William E. Miller
Posted on Sep 12, 2009
Please note that FixYa is not currently notifying us Experts when Clarification Requests are answered.
So please post a NEW question, and please include your brand name and the full model number from the tag in or on the unit, as well as the answers to these questions:
Which fan is it?
The internal cooling fan, which comes on automatically whenever the unit is microwaving?
Or the hood vent exhaust fan which you can turn on and off manually?
Or the convection fan, if it is a convection model?
When is it coming on?
Is it coming on whenever you cook on the stove top?
Posted on Oct 10, 2009
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