Re: timer switch is not working stuck in the on postion
I just had the same problem. It's the knob itself. You have to extract the knob by pulling, gently, and squeezing it out. The plastic housing over the metal thing is cracked. I took some super glue and duct tape and wound it tightly around it and pushed it back it and it works.
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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.
Electronic failure. If you like the grinder, plug it into a plug-in timer that only allows it to run when YOU want it to run. I have a timer like that on my coffeemaker so we don't forget to turn it off & let it run empty all day long. There are cheap timers available that will turn on for three hours if you push a little button, then shut off until next time you push the button. VERY handy, and they give you a selection of one hour, three hours, or six hours. For your purpose, one hour sounds fine. Or a wind-up type timer that stays on for only fifteen minutes, just long enough to grind coffee. Or unplug it when you're done. Or put it on a power strip with a switch.
Hi There is a thermal fuse on the side of the motor to prevent the motor from burning up. You can replace the fuse (it is a 103c thermal fuse, crimp it on ) and you should be in for more grinding. It could also be you timer switch, or bean hopper switch, or a broken tab on your adjustment collar.
The two small little guides you refer to are a pair of switches that get depressed when the top is pressed down. In the top is supposed to be a plastic pin in the top of each one of the grooves. When both pins push both of the switches down (look like black dots) the grinder wil operate. The proper solution would be to replace the top.
Open the grinder by removing both knobs. The front knob is held in place by friction. Use two flat head screwdrivers to pry it off. 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.