There is probably a small piece of paper jammed on the switch that activates the shredding function. Check if there is a piece of paper with some adhesive (like a label) stuck in there. This will keep the switch activated at all times, Simply remove it and it should work as long as the contacts are not bent .
Roland the Furious..
My Ativa DQ80M would run for about 2 minutes after it was done shredding. I cleaned it out thoroughly to no avail. Then I took the whole thing apart down to the activator switch. I was looking for an optical sensor (it doesn't have one). Inserted paper moves a small plastic piece. This piece squishes a small plastic diaphragm which activates the ON switch. As the diaphragm returns to its original size, the ON switch is deactivated and it stops running. I think the plastic diaphragm is old and just not as "springy" as it once was, so it takes considerably longer to return to its original size. To fix, I filed down the hard plastic piece (the one that paper moves and which squishes the diaphragm). I estimate that I took off a couple of millimeters. Actually I took a little off, put it back together, took it apart, and took off more. I took off the five screws on the bottom (probably voiding the warrant), removed the plastic cover, removed the blade roller mechanism (just lifts out, no screws). Then I removed two screws to remove the plastic switch housing. The hard plastic piece lifts right out to be filed. The end result is that the diaphragm isn't compressed as much and doesn't need as much time to return to normal shape.
Mine wouldn't stop either. Removing the shredder head off the wastebasket and looking at the shredding teeth revealed the problem. The teeth were mangled and severely bent and overlapping one another in the center of the teeth-bar. Paper was compacted in that area and the build-up made the shredder to run continuously when the power switch was on. I have the Activa DQ61BA from Office Depot. It has been used maybe 20 times at a seasonal lake home (really sparse use). It has shredded maybe 1 credit card and 10 staples on paper (which it is claimed to be ok). Since the problem is in the center of the teeth-bar, it must have been the one credit card that destroyed the cutting teeth--or else just bad design.....So much for Activa....
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Re: wont stop running
The auto switch is stuck. Feed more paper in it to clear it, and kick once for me. The shredder has a paper jam. You can try 3 or more sheets at one time to clear it. Also try 'paper shred oil'. You can buy it at Office Depot or Office Max.
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Unplug it and check to see if theree is any paper caught in the Start switch. Turn it Off, plug it back in and start in the Reverse mode. Then turn it Off and set the swich for On - shread.
If that doesn't work unplug it and find the start switch trip wire, Toggle it a few times with something thin - don't push too hard. You can also spray the switch the canned air used to clean keyboards. Plug it back n, start it in reverse then move it to shread.
in a lot of the models there is a switch in the middle of the slot where you put in the paper, right where the credit card shredder part is at. sometimes it's gets stuck. lean the shredder back and try tapping on the top. NOT BEATING on it just tapping it. in auto mode it should shut off once the switch jars loose. you may have to lean it forward also if the switch is in the front, just try both directions. you may need to unplug and turn the head over and check and make sure paper or plastic isn't stuck in the switch if it won't shut off at all. remember... UN PLUG IT BEFORE POKING AROUND IN IT!!!!
Most likely your optic sensor has something in front of it. Clean out the unit really well. It does take time, about 3 different screwdrivers, lon pliers and tweezers and a vacuum or compressed air. After that, learning more new words and swearing to god you will never let this happen again until the third time.
I see that the unit runs when in Auto position.
First make sure you turn the machine OFF then see if there is anything in the way of the shredder that gets detected by the sensor.
That can be one reason why it keeps on running when in Auto.
To reset turn the unit OFF and unplug it from the wall outlet or power source then hold down the power button for at least 5-15 seconds then plug it back in then turn or power the unit back up.
Still make sure that there is no paper debris anywhere in the way of the sensor.
I hope this helps.
Chances are it's over heated.
Ensure the wastebasket is empty then move power switch to the REVERSE position. This will reverse the jammed paper out of the shredder. If shredder jams again, alternate control switch slowly between REVERSE and AUTO (l) positions to attempt to move jammed paper completely through the shredder. If the shredder jams in reverse mode, move the switch to AUTO (l), depress the manual forward button located on the center of the shredder head and allow to run for five seconds. If jam does not clear, move switch to REVERSE again and allow to run for five seconds. Repeat this process until jam is cleared. If necessary, turn off shredder and use care to grasp the paper and carefully pull out to clear jam. Once cleared, move switch to AUTO (l) to continue shredding. The jamming may be happening because the cutting cylinder needs to be oiled. See oiling instructions below. From fellow's website:http://www.fellowes.com/fellowes/site/support/support_troubleshooting.aspx#jammed
Check your power supply, but usually there is an internal fault with the Motor, or switch. basically all they are is a switch, going to a Motor. To troubleshoot simply check for Voltage, at the Motor Terminals, if none find out why, usually, a broken wire, bad switch, bypass to test, or at worse a burnt out motor. This is evidenced by the fact you have full voltage at the Motor terminals but still no go. repair, and you should be all good.
You can test the Motor by simply putting the Power supply directly across the Motor terminals, for a very brief moment, and see if it runs.
The facts that the optical sensor is ok, and a high wattage resistor gets hot, indicates a mechanical problem, i.e. it's actually stuck (there may be a different power rating in the cpu, that means that by automatic, it stops by for example 1 Ampere, but by manual, there is no current check, i.e. the cpu delivers what the power supply is able to give. could be several A's, which will in turn burn the motor if you try the manual too long....) So, unplug the power cord, and try to move the mechanics by hand, and you will discover the problem.