Question about Sharp Microwave Ovens

1 Answer

Do you test your commercial microwaves for leakage? What standards do you comply with as far as allowable leakage?

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  • morrelj Aug 18, 2008

    The microwaves (3) we are checking are a SHARP model #R-21LC. We check our microwaves monthly (about 15) to ensure exposure limits do not exceed 5mW/cm2 as regulated by the FDA and EPA. We are using a microwave leakage detector MD-2000 digital readout microwave leakage detector that automatically alarms at this regulated value. The displays shows readings from 5-9 around the handle area.

  • William Miller
    William Miller May 11, 2010

    What model number do you have?

    I may have that manual or a similar one which covers that in detail.

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  • Sharp Master
  • 8,820 Answers

As per a similar manual:

1. Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.

2. Safety interlock switches: Primary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission in excess of 5 mW/cm2 at any point 5cm or more from
the external surface of the oven.

You need to be sure that if the meter comes with a styrofoam cone tip, that should be installed or it will give high readings.

Also, the meter should be calibrated periodically, typically annually.

If the meter gets dropped or bumped, that may throw it out of alignment.

The most common causes of excessive leakage are loose or misaligned door switch mounts or hinges and physical damage to the chassis of the oven.

The most common cause of the misalignment of door switch mounts is slamming the door.

I would be sure my meter is set up and calibrated, then I would be sure my door switch mounts are aligned & tightened properly.

From a similar manual:

1. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor. If the door sensing switch, secondary interlock switch and monitor switch do not operate properly due to a misadjustment, the following adjustment should be made.

4. Loosen the two (2) screws holding latch hook to the oven cavity front flange.

5. With door closed, adjust latch hook by moving it back and forth, and up and down. In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the door sensing switch and secondary interlock switch are activated with the door closed. The horizontal position of the latch hook should be adjusted so that the plunger of the monitor switch is pressed with the door closed.

6. Secure the screws with washers firmly.

7. Check the operation of all switches. If each switch has not activated with the door closed, loosen screw and adjust the latch hook position.

After adjustment, check the following.

1. In and out play of door remains less than 0.5mm when in the
latched position. First check upper position of latch hook, pushing and pulling upper portion of door toward the oven face. Then check lower portion of the latch hook, pushing and pulling lower portion of the door toward the oven face. Both results (play in the door) should be less than 0.5mm.

2. The door sensing switch and secondary interlock switch interrupt the circuit before the door can be opened.

3. Monitor switch contacts close when door is opened.

4. Re-install outer case and check for microwave leakage around
door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

Please write back with more details if you need further help.

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

Posted on Aug 19, 2008

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1 Answer

How do I test a microwave oven for leakage of radiation around the door?


A lot of electronic suppliers will supply a meter which can check this.
Have a look at this:

http://www.test-meter.co.uk/microwave-leakage-detector/

..or Google microwave leakage detector to find a local supplier.

Feb 26, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

How can i tell if microwave is leaking


The only way to tell for sure is to use a microwave leakage tester, which is an electronic instrument calibrated to standards for an accurate measurement. They are fairly expensive, so you aren't likely to run out and buy one. If you have reason to think your oven is leaking, you should call for service or take the oven in to a shop where they should have a tester.

Unless something has happened to damage the door sealing surfaces, your oven should not be leaking microwave. Check that the inside of the door and edges of the cooking cavity are kept clean of built-up food. Look at the door when it's closed. If it's straight side-to-side and is closing properly all around there should be no problem.

Do not believe the claim that you can test for leakage by calling a cell phone placed in the oven, and if the phone rings the oven is leaking microwaves. The shielding in a microwave is not effective at cell phone frequencies, which are much lower than microwaves. The phone will ring normally even in an oven with no measured leakage.

Feb 11, 2010 | Whirlpool GH4155XP Microwave Oven

2 Answers

How do I test a microwave for 'leakage'?... Does calling to a cell phone placed inside a closed microwave indicate 'leakage' if the cell phone rings/receives the call? Thank you


The "cell phone" test is a fraud. Cell phones operate on a frequency range much lower than microwaves (800 MHz for phones and 2.5 GHz for the ovens), and the metal screen in the microwave door won't affect them. The phone will ring loud and clear and it doesn't mean the oven is leaking microwaves.

You can buy a "microwave leakage test card" at some stores that supposedly change color when you hold in front of the door if the oven is leaking microwaves. This is also a fake. It actually responds to heat, on the thory that if heat is escaping around the door then microwaves are too. That's wrong.

The only sure way to test for microwave leakage is with a standardized leakage test meter. This is a fairly expensive electronic device. You really don't need to worry about microwave leakage unless the door of the oven is visibly out of alignment so that it isn't closing and sealing properly. If the door hasn't been getting slammed shut and the oven hasn't been dropped, everything should be fine. Take the oven to a service shop for a leakage test if you are concerned.

One final note: Microwave energy drops off rapidly with distance. Just don't stand right in front of the oven while it's running.

Hope this helps ease your mind. Thanks for using Fixya!

Feb 02, 2010 | Microwave Ovens

1 Answer

Lg microwave will not heat at all


Test the high voltage capacitor, the rectifier diode.or the magnetron.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

Apr 28, 2009 | LG LTM9000 Microwave Oven

1 Answer

Everything works does not heat


If the microwave operates normally, but does not heath at all, then it can be the high voltage capacitor, the rectifier diode.or the magnetron.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, your model number did not return any result, contact the seller here to purchase parts. (here in UK).If the microwave operates normally, but does not heath at all, then it can be the high voltage capacitor, the rectifier diode.or the magnetron.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, your model number did not return any result, contact the seller here to purchase parts. (here in UK).

Apr 27, 2009 | General Electric Microwave Oven

1 Answer

Microwave wont heat


Test the high voltage capacitor, the rectifier diode.or the magnetron.

If it additionally does not spin and no light, then check also the door switch.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts. (here in UK).

Apr 04, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

The microwave does not heat and the turn table does not turn


Test the high voltage capacitor, the rectifier diode.or the magnetron.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

Feb 24, 2009 | Maytag MMV4205 Microwave Oven

1 Answer

Microwave heating


Test the high voltage capacitor, the rectifier diode.or the magnetron.

If it additionally does not spin and no light, then check also the door switch.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts. (here in UK).

Dec 17, 2008 | Kenmore 63792 Microwave Oven

1 Answer

During heating, my microwave stop for unknown reason


Contacts to the door switch, are the most common reason for this problem.

The diode and capacitors can also be tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts. (here in UK).

Nov 12, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave runs and has functional control panel, but no heat.


The controler board, or the power supply for the magnetron has probably failed, or a safety switch is not working properly. It is also possible that the controler board is in a protect mode because of a defect.

The magnetron uses very high voltage at very high current. There is a very large capacitor in the power supply for filtering the DC for the magnetron. This area of the microwave oven is very dangerous to work on. The power supply can be lethal if proper procedure is not complied to when working on it.

I strongly suggest that you do NOT attempt to service this yourself, unless you have the proper training, test instruments, tools, and service manuals to work on it.

After servicing, the tech is supposed to verify the operating power level, and do an EM (ElectroMagnetic) radiation leakage test. This is important after servicing this type of appliance.

Take the microwave oven in for an estimate. From this you can make an intelligent decision if you are going to have it serviced or replace it.

Excellent article about microwave ovens:
http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Microwave_ovens_safety_issues?Open

Microwave Oven FAQ from GE:
http://www.geappliances.ca/faq/faq5.jsp



Jerry G.

Apr 14, 2008 | GE Spacemaker Over-the-Range Microwave

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