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The speed control usually is by electronics. The speed control switch will merely be telling the circuitry what speed is required but if the circuitry is faulty nothing will happen.
If you replaced and wired up the switch and potentiometer correctly and the new parts are not faulty that only leaves the Printed Circuit Board as the cause of the problem, it won't be the motor.
It will probably just need the pot replacing, take note of where the wires go. I see someone else here is doing the same job and wants to know where to put them back. Take a photo first saves a lot of grief. The pot is the rotary resistance switch behind the knob.
The hex wrench only fits in one position, there is a groove in the lip in the top housing and you need to turn the coupling until the hex screw head lines up. The groove is normally plugged with a dob of white silicone. The hex screw is not tightened fully tight on reassembly, the coupling needs a bit of slop. Speed control problem will likely involve replacing the control switch assembly.
Some models had a weakness with the variable resistance in the rotary switch but your description sounds more like the main PCB or even the motor both of which are very expensive parts to replace.
My Blender Model number KSB560MCO does not run. When try to blend all of red lights come one and they blink and move around. Any suggestions what could be wrong? Appreciate any help. Thanks
This problem sounds like failure of the Variable Speed Potentiometer component. Here is the most helpful Fixya article so far: http://www.fixya.com/support/t6032529-need_replace_speed_control I have the same problem right now and don't want to pay ridiculously high prices for a small electronic component. So far, this is as far as I've gotten in researching replacement parts:Vitamix Part #015955 Partstown sells #15955 for $23.39 on their website but I found out they charge $15 for shipping -- for a one-ounce piece of electronics. I won't pay to be ripped off on shipping so I won't buy one from Partstown until I've exhausted less-expensive suppliers. Here is the product at Partstown: http://www.partstown.com/vita_mix/vm15955
Another Fixya contributor, Robert Sadler, said he was going to try a generic potentiometer from Mouser.com. His descriptions are kind of vague for me. I'm not an electronics expert so I'm not very confident I can interperet his description:
"If you are comfortable with soldering, you can get a replacement part at Mouser.com. The pot is a 5k "slimline" made by Bourns, however looking inside the cover it looks like most pots would fit. I ordered one for a bit over $5 and will update when I get it with how it worked. You would just have to solder the existing wires to it." -Robert Sadler
I have no problem soldering the existing wires onto a new component but I don't really know what would be an appropriate potentiometer to buy as a replacement from an electronics supplier. In addition, Mouser's website seems to sell potentiometers only in bulk quantities of 5, 6, 12, or 45 items at a time. I just want one.
If anyone knows how to interpret Robert Sadler's comments, or has actually done this repair, please post below. I'm sure quite a few people would benefit from a high-quality repair at a low component cost.
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