I have a power problem with my Sharp R1610 microwave. No power to the control board after replacing it. Fuse is good and I have power to the RY1 common terminal. I have checked all door switches, wiring connections to assure accuracy. I have no operation at all. If I short the thermal switch on teh bottob the fan does come on. I have not lights, bells etc. Where does the AC power connect to the board? What terminals top I test on te board.
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Unplug your microwave and turn it around and remove the screws holding cover on and then remove the cover. Look for where the power cord goes into the back of the unit and follow the black wire from the cord to where it ends. It should stop an either a circuit board or a fuse holder. Make sure that you replace the fuse with the same amperage fuse as what you take out. You will find the amp rating stamped on one of the silver collars on each end of the fuse. Good luck!
There are a couple of safety thermostats in the oven to shut down power if something overheats. One is on the magnetron tube (the microwave source), the other is on the cooking cavity. These sometimes go bad. There's also a power line fuse that may have failed, or become loose in its mounting clips. These can be tested with an ohmmeter; they should all measure very close to zero ohms if they're good.
Another possibility is that the control circuit board in the oven may have failed. I have worked on several Sharp ovens where the power transformer for the board has gone bad for no good reason. If the board goes bad the oven may appear to be dead as well.
Microwave servicing is best left to professionals. If you're thinking of keeping this one, take it to a service shop (or call for home service) and get an estimate. Then decide whether to repair or replace.
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It could be the turntable motor, the turntable support (with built-in coupler) or a problem on the control board.
I would first look at the 3-legged turntable support with built-in coupler to see if it got hot and warped. It should be flat across the top from the center to the end of the legs.
If the support's legs are pointing a bit downward, it will prevent the coupler from making contact with the motor shaft.
I've held bent ones a few inches over a gas burner to heat them up where the legs meet the center hub, then set something a bit heavy on it to hold it in place while it cools.
If it needs a new one, it is part # FROLPB025MRK0 and it runs $19.50 retail at Tritronics.
A quick (but not necessarily definitive) test of the motor is to grab the shaft gently with pliers and gently try to turn it.
If it moves slowly and makes a high-pitched whining noise, it's likely okay. If it won't turn or grinds, it is bad.
The number for the new turntable motor is RMOTDA264WRZZ and it retails for $8.87.
Please note that you may need to look under model R1600, R1600, R1601, R1601, R1610, or R1612. They are all mostly the same.
Tritronics is at http://www.wehaveparts.com
The service manual for the R1610, R1611, R1612 can be downloaded at: http://www.microwavedisplay.com/R1610.pdf
There may be a grommet bewteen the mtoro and turntable support. Don't lose that! Be safe!