Table speed is not constant... turntable mr 711 micro seiki

the turntable speed is incorrect
adjust with the speed control setting
many quality turn tables have bar codes around the outside edge and when viewed under a light those bars appear to be stationary when the correct table speed is set
It is a strobe affect in time with the frequency of the light

Power to the turntable motor is supplied by a relay mounted on the main control board ( the part behind the control panel). Sounds like the relay contacts are stuck in the closed (on) position. You can try getting to the main board and tap the small box looking parts on the board with something like a screwdriver handle and see if you can get it to unstick. If that doesn't work---board needs replaced.

Web search "hum on turntable with ground" for various techniques to analyze it.

hi,
your turn table is a belt driven one. The speed turns down when the belt become expanded. you should replace the belt of your turn table. Also put some lubricant in its center shaft ( not from the top lubricate it slightly after removing the plater).

I have here added some video related to the replacement of belt for turntables.
Not the exact for your one,for all the belt driven turntable the procedure is the same
ok

The turntable motor might be the problem, if the grease is old it becomes hard causing the turntable to run slow, by your description we can rule that out since you indicate it runs to fast. therefore it is the voltage that powers the motor with a regulator "keeps voltage constant" or the motor itself will be the problem. The pitch control allows a small change in speed when required.

1. the motor to rotate the glass table in the micro wave may have stop working or the switch to the motor is defective.

I have the same exact problem with one of my 1210 MK2 turntables. It seems like the motor is too slow now. When I hit the start button or release the record, it takes much longer to speed up to the normal speed than my other same exact turntable. I don't think it has anything to do with the pitch slider. Please let me know if you find out what the problem is thanks!

Do you cook a lot of popcorn?

Do you place your food items in the center of the turntable as opposed to placing them off-center?

Both can cause repeated heating of the same spot on the turntable, which can stress it and allow it to crack.

You can buy replacement parts here.

I suggest that when you cook popcorn, place a paper plate or two upside-down under the bag and always place your food items off-center on the turntable tray.

Once you have the new parts, I would suggest at least a quick heat test. That is to heat one cup of water on high and it should boil in about 2 to 2-1/2 minutes.

If you would like to perform a more standard heat test, please see my Ask Mr. Microwave page.

If your magnetron is indeed running too hot, then it is probably dying. Sometimes - like a star - they can burn hotter right before they die.

We're happy to help and we appreciate your thoughtful rating of our answer.

Mine isn't working either, have you tried your speeds? I messed with mine and found out only the 78 speed works.

Unfortunately, it does sound like a drive issue. Just so you know, these units are direct drive, so there is no physical motor. It's just a bunch of various circuits which drive the unit, and if any one of them go bad, it will affect your turntable speed. You will need to have this looked at by a service technician to determine which circuit is faulty.

- TWEAK AV LAB