Question about Sharp R-1210 Microwave Oven

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Can you let me know the connection digram of transformer to capacitor with high voltage fuse in a microwave. Make is sharp

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Since you posted this under R-1210 / R-1211 / R-1214, I can point you to the service manuals that cover those models here:

http://www.microwavedisplay.com/r1200_r1201_sm.pdf
http://www.microwavedisplay.com/r1210_r1211_sm.pdf

Those models don't have high voltage fuses, but the connection of a high voltage transformer to the capacitor is almost always the same, so they may help you.

The high voltage lead of the HV transformer connects to one side of the capacitor. Unless there's a fuse inline, nothing else is connected to this point. The other side of the capacitor is connected to the anode (non-stripe side) of the high voltage rectifier diode, and to the FA terminal of the magnetron.

If you still need help, feel free to contact me with your full model number.

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

Posted on May 16, 2010

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1 Answer

Sharp r2103j microwave lights on doenst heat up


No heat, but unit seems to run normally in all other ways - possible causes: failure of high voltage rectifier, shorted high voltage capacitor, magnetron failure, power transformer open/shorted winding(s), thermal protector open, or no 120 v supplied to power transformer.

May 04, 2014 | Sharp R310J 1200 Watts Microwave Oven

1 Answer

Sharp convection microwave oven model R1875F. It's cooking on the left side faster then the rest of the oven. It seems to burn on the left side and not cook in the middle.


see the next causes. God bless you
Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

Door Switch If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.

High Voltage Capacitor If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

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.

Thermal Fuse If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

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.
10_4_2012_4_35_53_pm.gif10_4_2012_4_36_18_pm.jpg

Oct 03, 2012 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Sharp micro doesn't heat


see this causes and fix it. God bless you
Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

Door Switch If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.
High Voltage Capacitor If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

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.

Thermal Fuse If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

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.
10_3_2012_5_04_17_am.gif

Oct 02, 2012 | Sharp Microwave Ovens

1 Answer

Sharp microwave microwave does not work but still roast can you advise me


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.
Hope that helps.

Mar 03, 2011 | Sharp Microwave Ovens

1 Answer

Microwave clicks but will not turn on when hitting start button.


It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, 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.
Hope that helps.

Jan 01, 2011 | Sharp R-428 1200 Watts Microwave Oven

1 Answer

I have a Dacor microwave DMO24 oven which i think is manufactured by Sharp. when the cook function is started it will hum/buzz for about 1 second and then blow a fuse. from the sound, and it's...


It is indeed made by Sharp.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead several seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/cap_test.html

http://www.gallawa.com/microtech/xformer.html

OR, we have the service / repair manual for this model and have uploaded it to our site here to help you.

The parts list is here.

You can order Dacor parts
here.

If you prefer to order the original Sharp parts (which are usually considerably less) look for the part number on a tag on the transformer or capacitor (whichever is bad).

The part number for the capacitor will be similar to RC-QZBOl8MREO and the transformer number will be similar to RTRN-BO59MREO. Again, these numbers are examples to show Sharp's number format.

You can order Sharp parts from Encompass here http://tinyurl.com/7qy85y or you can 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.

May 18, 2009 | Sharp R-1480 Microwave Oven

2 Answers

Danby 1000 Watt Microwave is completely dead. Just stopped working right after heating up a dinner.


you may have just blown a fuse inside the microwave or the transformer inside has now failed and will need replacing but it will need to be looked at to see what exactly happened

electech

Nov 27, 2008 | Microwave Ovens

1 Answer

Sharp 1850 microwave


The most likely sources of the funny sound would be the high-voltage diode, transformer or the magnetron.

 

It's possible that the high-voltage capacitor shorted and blew the fuse.

 

It will take some troubleshooting.

 

At our site, we have critical safety information, and disassembly information.

 

See our listing here on FixYa: http://tinyurl.com/yzjozk

Oct 20, 2007 | Sharp R-1850A Convection/Microwave Oven

1 Answer

Sharp microwave


If it died as soon as you hit the Start pad, it probably has a shorted high-voltage capacitor. If it died a few seconds after you hit Start, it may be a shorted high-voltage transformer. Can you describe in more detail what happened? Have you checked the outlet for power? Have you checked the fuse inside? I'm happy to help you.

May 14, 2007 | Sharp R-202EW Microwave Oven

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