Question about Braun KMM 30 Electric Burr Grinder

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Take apart Trying to replace timer switch, but I can't get pas housing screws. They are tamper resistant: anyone know what brand/kind?

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Re: Take apart

My grinder went from bad to worse and finally stopped grinding (with the motor still buzzing but absolutely no grinding). Knowing I had to do something or throw it away, I pulled the clear plastic bean reservoir upward and separated it from the grinder body. I looked down the hole where beans go down to the grinder and found packed coffee ground blocking the hole. I cleaned the whole thing, put the reservoir back, and my grinder now works like new :-)

Posted on Jul 18, 2008

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Re: Take apart

Taking this thing apart is not easy. It may require a Torx bit, but it takes a 4 to 6" long extension. The second suggestion worked for me. I had used the bent handle of the spoon to try to loosen packed coffee deep inside the grinder with little success. Turning the machine over and rapping on it loosened a lot of partially ground beans and packed coffee. Works good now. Will do this regularily now

Posted on Feb 22, 2008

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Re: Take apart


Your local hardware store sells kits with tamper resistant bits. Ace has them, too. There are two kinds of bits generally used Torx which is simply a 6 sided bit and tamper resistant which adds a button in the middle of the "star". I've seen both in this type of unit. Determine if you need the button style by looking at it. All turn counterclockwise to remove.

Oh...cafelover, take the unit apart by removing the burr assembly, cleaning it out and reassembling...that will likely cure your problem. If you want to do a bit more...simply turn the empty unit over a tap it on a newspaper covered surface.

Posted on Dec 04, 2007

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If it doesn't work, it may be the On/Off switch.

I have had this grinder for a number of years. About 3 years ago we moved and upon arrival I plugged it in, loaded some beans and pressed the on button - Nothing. Now I know a little bit about these things & I was sure it was not the motor. I completely disassembled the Burr Grinder. It comes apart by removing the rubber feet on the bottom, then removing the screws under the feet. The top part comes apart by removing the screw from the 4 corners (it is easiest if you remove the timer board first). You need a long Philips screwdriver. Before you do this, make sure you are comfortable messing with electronics etc. The last screw to remove the top is under the grind catcher area directly underneath the timer rheostat. Once I had the top off, there is a small circuit board with the timer rheostat (a liner rheostat, not circular) and the On/Off switch. I measured the resistance of the On/Off switch and there was no difference when I pressed the button, obviously a bad switch. The switch is a small, about0.170" thick switch. I was able to find a switch at Radio Shack that was actually the same except it was thinner. I unsoldered the old switch and found a little piece of solid rubber used for gluing on the bottom of something you don't want marred. It was about 0.95", so it raised the new switch up just enough to make contact with the button on the lid when it was pressed. Attached wires to the new switch, soldered it in, put it back together,and fired it up. Works like a charm.

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Just adding to dhelkamp's instructions (which helped me immensely!).

The front quantity knob kan be pulled right out - it's held in place by friction only.

The side knob has 3 latches holding it in place. Releasing 2 is sufficient. Use 2 small flat screwdrivers.

As for the assembly, there are 4 latches in the inner assembly holding it in place. The location of these latches can be seen by looking at the edge of the outer shell. The front latches are just behind the holes for the rubber feet, and the rear latches are just in front of the rear holes. Use a flat screwdriver to release one of the front latches, while pressing down on the outer shell - it should give way 1-2 mm. Repeat on each of the other 3 latches, whilst keeping pressure on the outer shell. The cover should easily slide off the grinder assembly. Beware of getting pinched!

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I just bought a brand new unit and as recommended I unscrewed the top bean hopper and the coffee ground container-cleaned and wiped.After that I screwed back everything and tried to grind some beans.The timer was ticking away but the grinder just refused to start.I switched off the main and unscrewed the hopper and carefully screwed it back.Halfway through,I noticed and felt that you must balanced and screwed it with a smooth movement until the the whole piece is in place.The grinder just started without a hitch.This grinder has a protection circuit whereby if any part is not properly installed it will not start.

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Open the grinder by removing both knobs.
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The side knob is held in by tabs you have to push. Pry forward to expose the tab, and use another screwdriver to press the tab, and use the other screwdriver to press the tab on the other side.
Now look at the bottom of the grinder. There are four tabs on the outer shell, use screwdriver s to pry the tabs to separate the bottom of the grinder from the shell, and pull off the shell. Your fuse should be attached to the motor wiring coil.

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My grinder is jamming

Possible that you installed something incorrectly but I don't think so. It sounds like you're not after the right problem. My guess would be that some bean shards got into the motor or some other place. Most of the motors used on these machines are geared down so that they make more torque and lower speed. Thus...the motor itself is actually quite weak. That's why it is jamming.

What I would start with: take the unit apart as much as you taking out the burr, the receiver cup and all that. Turn the unit over and tap it onto a newspaper covered table with some bit of force. Do it a couple of times. That may fix it. If not, you'll have to disassemble it and find the item jamming it up. Be sure the unit is unplugged when handling it. It is possible that some of the screws are non-tamper. You can get the right bits at the hardware store. Be sure to tighten all screws when you're done.

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