Sharp R-1754 Stainless Steel 1100 Watts Microwave Oven Logo
Posted on Dec 14, 2010
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The heat is inop - everything else works on my R-1754 Sharp. Any common problems?

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William Miller

William Miller

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  • Sharp Master 9,179 Answers
  • Posted on Dec 28, 2010
William Miller
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If the fan and turntable are not working when you try to cook, it's likely a bad bottom door switch or mount. See this file.

If the fan and turntable ARE working when you try to cook, the problem is the primary interlock switch, the inverter, the magnetron, or a connection between one or more of them.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.

We have the service manual at our site and have uploaded it here to help you.

You can order Sharp parts from Encompass here or call them toll-free at 866-779-5835.

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

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Usually one of three things and not in any order:

The diode commonly used in most microwaves= it cannot be shorted and work.

The inverter board which powers the Magnetron.

The magnetron itself which does the work and can only be tested for sure by replacing.
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The problem is in the magnetron, "heart of the microwave oven" or the inverter board if the system is less than 7 years old.
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There are three common problems, bad magnetron, cracked high voltage diode, and a shorted capacitor, getting it serviced will not be cheap comes down to a personal decision.
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This a common problem, the likely cause is a bad magnetron "heats food" and is the heart of the microwave oven, if the item is five years or more, cheaper to replace.
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This is simply a rebranded Sharp R-1750, 1751, 1752, 1754 unit.

We regularly repair such control units for customers nationwide by mail for $39.95 with a one-year guarantee.

At our Web site, we have a video available 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.

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If it runs and makes normal noise but just no heat, issues is either a loose connector to magnetron or at diode to capacitor. Be careful with capacitor because it stores thousands of volts.
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