Question about Sharp R-398F 1100W 33 Liters Microwave Oven - Stainless Steel 220 Volt

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Blinking display in sharp microwave oven R-398f(s)

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Microwave oven r-1502(sharp)

I'll do that; I'm a bit surprised at how many people have the same problem; This is likely the last Sharp microwave oven that I will buy or recommend.

Thanks so much for your help.

Posted on Feb 21, 2008

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MicrowaveSvc
  • 9085 Answers

SOURCE: R-4H84 Sharp Carousel II microwave oven stoped working

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

MicrowaveSvc
  • 9085 Answers

SOURCE: Sharp Carousel Microwave Convection Oven

The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for maybe an hour.

Then let us know if the hard reset does not fix it.

You may have a bad keypad.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Sep 16, 2008

MicrowaveSvc
  • 9085 Answers

SOURCE: sharp microwave oven model r-1850

Are you saying it's dead, with no display and no inside light when you open the door? And the fuse is good?

If so, you may have a bad magnetron temperature fuse. This device looks similar to the attached photo and is located near where the magnetron mounts.

You can usually find exploded views entering your model number at the Sears parts site.

The best place to order Sharp parts is Tritronics.

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.

At our site, we have a video showing how to remove a typical over the range control panel assembly in under 5 minutes.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Nov 01, 2008

MicrowaveSvc
  • 9085 Answers

SOURCE: The number display on my Sharp R-515EK 1200 watts microwave oven

We regularly repair these control / display units for customers nationwide by mail for $39.95 postpaid in about a week or so with a one-year guarantee.

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more information & help.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com
Microwave Oven Control Panel Repair Nationwide

Posted on Aug 31, 2009

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2 Answers

Replaced 20A fuse - now have blinking lights


either the cutoff is open circuit or closed circuit if you get any reading at all it is good. I would look at the control panel look for overheating components. Tap any relays to release them if they arced inside. Whenever a microwave blows a fuse it is time to replace the huge capacitor at the back and possibly the magnetron. I resurrected my Sharp R9H66 Microwave Convection Oven easily. Had to replace the magnetron twice in the last 5 years

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Replaced 20A fuse - now display blinks


Here is the parts page for your unit with an exploded view and parts list

http://www.searspartsdirect.com/partsdirect/part-model/Sharp-Parts/Microwave-Parts/Model-R-9H84B/0958/0123245/P0050209/00001 It is possible the switch is bad the look at part number 1-6 hope this helps.

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see the flow chart and proceed according: you can have problem faulty board or sensor.

7_14_2012_11_03_34_am.jpg7_14_2012_11_04_30_am.jpg

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If you mean the display (the microwave works but no info on display) look here for a good diy thread:
http://nzlamb.wordpress.com/2010/04/10/sharp-carousel-microwave-lcd-repair/

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Sharp microwave is a very good unit. If you have done same repair twice before, i suggest replace board complete with display next time as there could very possibly be a set of defective components on the old board that is causing this display problem. Have done this repair before and noted how thin the tracks are also. Honestly go for new board if you can.

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Nope , could be dry joints or corroded pcb or defective display driver or supply ? Only can be told once opened and inspected.

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you need to replace you controller

Feb 01, 2008 | Sharp R-1502 Microwave Oven

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Sharp model number: R-320HQ (1200 watts)


the electronic circuit are corroded timer does not function / the IC program was lost of memory such as function / if you have some old look a like Sharp Model you may transfer control panel.

Jan 05, 2008 | Sharp R-510HW Microwave Oven

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Sharp R-1505 Microwave


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I would first suggest that you be sure every single wire got reconnected where it belongs.

Here is a diagram: http://www.microwavedisplay.com/r1500_series_wiring.pdf

If you still have toruble, see http://www.microwavedisplay.com

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