Manual coffeegrnder (KYM) is jammed

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you should not do this

the knob keeps two burrs together .The knob forces the screw (when you turn for grinding quality).
and adjust burrs far and close as needed
.reinstall it and turn the knob to the right until you feel tightness.Then,turn to the left 3 turns. and then adjust the grinding quality whatever you like .
thanks
please rate my work

You should clean it with a brush After every use.

If you did not opened upper holder of burr for cleaning long time it may block and cause problem for settings. In that case you:

1. stabilize the body of grinder
2. provide block spin to be in release position
3. get one 3 legged key for releasing oil filters
4. put filter legs at upper holder of burrs
5. start to release carefuly

be gentle at first, go forward and backwards to measure how much strength is required you clean it and put it inn without block spin for testing , if it is ok than you assemble it properly

First, I'm not a Baratza tech, but I have worked on commercial grinders. You should contact your vendor for service.
*** The following is for information only ***
* check on line for your model parts manual. The diagrams will help you identify the parts needed and should provide instructions on replacing/cleaning the burrs.
* As you've figured out, cleaning with rice is not a good idea.
* Burr plates do get dull and needs to be replaced. Longer grind times and frequent adjustments to get finer grinds is an indication of dull plates.
* The oil in the beans used gets caked up under and on the sides of the burr plates.
* Heavy usage and long grind times will melt the oils and fill every part of the burr chamber and even get into the motor and bearings. I've found oil in the on/off switches and rotary switches.
* The burr plates must be removed and chamber cleaned of all oil residue and beans (rice too). Use a vacuum cleaner and stiff brush to clean. Do not use water or any liquids in the burr chamber. You can clean the burrs in wash water once it's removed from equipment. Dry thoroughly before reinstalling.
* The motor should turn freely by hand (no power!) with nothing hitting the sides or under the plate. If it's difficult to turn or makes grinding or whirling noise. Then the lower plate needs to be removed and cleaned. The motor bearings will need to be replaced if the motor does not turn at all.
* Once cleaned and assembled(without any beans) Power up and check the operation. You should have a motor hum without any clanking or screeching (metal rubbing metal) sounds. Stop and power down if you do. Motor bearings are bad.
* If you get nothing then check the switches. Oil probably got in them. Replace.
* Runs okay? Then set the grinder to a large setting (like drip coffee; Turn on and allow to run while you drop some whole beans into the hopper. Use 1/4 cup or less. This should grind through smoothly.
* Placing another 1/4 cup of whole beans. Turn on grinder again. Just hums without grinding? Power down. Replace motor starter capacitor.
* The capacitor is round and usually attached to the motor like a 'hump' on the side or near the top. If you didn't take it apart then one of the wires in the switching side may be miss wired or loose. Check both for loose and correct wired. Careful around the capacitor as it may still have a charge! The capacitor is used to kick start the motor with it's heavy burr plates.
* If your still having problems with low power. Check the motor for burnt smell as you may have overheated and fried the motor. They usually have thermal resets, but if you kept forcing the reset to keep grinding then the motor is defiantly burnt out.
* Final; if everything is working but your not getting the fine grind setting (you should at least get espresso setting but not turkish) then the burrs are gone. It will only be good for drip coffee.
Aloha, ukeboy57

PS I found a cute video on how to clean the burrs (frequent cleaning)
https://www.bing.com/videos/search?q=baratza+virtuoso+grinder+cleaning+burrs&&view=detail&mid=41DCCF0EB0CACFEA9E4841DCCF0EB0CACFEA9E48&&FORM=VRDGAR

I would suspect a log in the outlet shute where it goes into the grinds hopper. Clean it out and then turn the hopper to the coarsest setting to clean it out all together. Coarse grinds are a very good cleaner.

Try this, remove the bean hopper, and vac out the burr chamber, then put 1 tablespoon white rice in the burr chamber and cover with hand and turn grinder on, if the rice grinds, then your grind might have been set too fine. Turn the grinder towards fine until you can barely turn the burr nut, you will feel them touching, then turn course about 16 notches (do not use numbers, use the small notches around the rim), that should give you a great starting point for your grind.

Hi Your burr is not locked in. You need to remove the beans from the hopper. Remove the hopper. Remove the burr. Turn the grinder upside down over the trash can. Put the burr back in only make sure that the burr is down. Install the bean hopper and when you turn the bean hopper it should move the burr. Then you can adjust your grind. Make sure that the grinder is running is your going to a finer grind or you could break the grinder. You can turn it to a coarse grind any time.

1. because it didn't work a wilde the upper burr holder could be jammed, carefully take id off, clean it good and then put it back until you touch lower burr with the upper.
2. to get starting point you adjust burrs to touch each other. when they touch each other you have finest grinding, after you hear metal voice you turn back 3 dots and grind only for 1 dose. you check it, if it goes to slow, you go one more back and clean grinder, THAN you grind 1 dose more. 2 or 3 times and you will get perfect grinding.
   

After taking the top burr off several times and rescrewing it, I finally was able to exert enough force to get it to turn a couple of extra turns. Evidently there was some oil or coffee gunk (although I could see none) that snagged the bur. Now it appears to work as before.

This is a great, service by the way. Even the process of thinking through the problem so I could post it helped me solve it.

mazzers have 3 springs in grinder body, each one support for upper burr holder. check for them , if it is not the case than consider that the spring could come with coffee. often we see stones and metal parts geting between burrs.
clean it again and look good for 3 springs , if they are in their place, close the burrs to finest than go back for half of circle and grind coffee.