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Sanyo EM-710F display dead

Just fried our Sanyo EM-710F microwave circuit board. Urghh After 16 years service first the Magnetron and fuse diode across the HV cap went last week. Replaced them and all working OK for 1 day. Then while door open to clean a spill, a big bang and unit dead & no display. Found fuse and interior light blown- replaced and display still dead. Checked high voltage circuit and all seems OK (but this would not influence the dead display). Removed display circuit board and found track from circuit board connector 'S1' pin 5 to Tx vapourised. Primary winding of Tx measures open circuit too (measured across the Tx primary itself). Have not yet desoldered Tx to see if any hidden fuse link or damage there. Also some heat damage around components R12, R18, D14 (but these resistors still measure correct resistance). Urgh. hope there is a fuse link or something under Tx. Not sure where to get this part if stuffed? Tx is marked 'PE5M-257. Any suggestions on Tx source?? Any suggestions if anything else is likely stuffed too? Many thanks if you can help. Cheers, john

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Low voltage Tx actually OK. Restored vaporised circuit tracks on controller board, fuse and interior light globe. All working OK.

Posted on Jun 22, 2008

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Whirlpool microwave keeps opening high voltage diode


If you do not have any experience in the repair of microwave ovens do not engage in their repairs because it is one of the most dangerous household appliances and the consequences can be disastrous. According to your description, low voltage circuit (220V or 110V) works well (light, turntable...). Obviously the problem is in a high voltage (HV) circuit which is made up of the magnetron, HV diode (rectifier), HV capacitor and HV fuse or protect diode. Failure is in any of these components in "HV circuit" or sometimes in interlock switch assembly or PC Board.

First, you must be sure which diode is blowed, reactifier or protect diode.

To check magnetron following this procedure:

Discconect the mains supply.
Check that the capacitor is discharged (by resistor 100 ohm / 10W or more).
Discconect the magnetron.
Measure the resistence between the disconnected terminals (should be app. 0.5 ohm).
Measure the resistance between the supply terminals (both) and earth. The resistance should be infinite.

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Dado

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see this causes and fix it. GOD BLESS YOU
Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.


High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.


Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.


Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.
High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.
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1 Answer

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It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.

YOUR SAFETY IS PARAMOUNT

This is a job for a professional but if you are safety clued up, here's instruction.
Make sure the !!!!any capacitors are discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
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My Sanyo microwave oven (model: EM-G4753) isn't heating my food. Everything else works, the fan, the lights. The microwave turns and sounds like everything is working but the food won't get hot. It is only...




It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.

YOUR SAFETY IS PARAMOUNT

This is a job for a professional but if you are safety clued up, here's instruction.
Make sure the !!!!any capacitors are discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
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The magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.

The cooling fan and turntable motor get their supply from the same point as the main transformer. If the magnetron or diode has failed that will cause excess current to be drawn and take out the supply fuse.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
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http://www.givemefile.net/smanuals/_microwave_ovens/sanyo/file/6419.html
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OK above is a service manual, this should get you into the "ball park" I have given you also a DIY repair of microwaves.
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BE CAREFUL. Microwaves are LETHAL.

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Reply back and I can help you more. These failures happens to new or old microwaves.

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If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, 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.

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If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

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