The high low switch works fine
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.
Replace the potentiometer with a newer and BETTER one. Vitamix installs a .75 watt 5000 ohm general/CHEAP potentiometer, stay away from the cheap general purpose (low life cycle), the CHEAPER potentiometers WILL need replacing sooner rather than later!
Replace it with a COMMERCIAL GRADE 2 watt, 5000 ohm, 25000 rotational life cycle potentiometer!
You can use the following part numbers to reference this part anywhere, including ebay!
"RV-4NAY-SD502A" or RV4NAYSD502A
OR
"53C3-5000-S" or 53C35K
Typical price should be under $10.00US delivered. Do it right the 1st time... the commercial pot's will likely last longer than you do!
Https://youtu.be/rGh4hBvNqrA
I repaired my speed control without any spare parts as shown in my video.
HI That variable speed switch is actually available online for $.50 YES FIFTY CENTS....if you order from the right places.... Specifically I ordered from Parts.Arrow.Com.... no minimum # of pieces... a flat shipping fee of $4.05 USPS or $6.99 UPS/FedEx.
I gave the exact part number as it was printed on the switch in very tiny print. I couldn't find any images of the switch I'm receiving, but the part # is identical so I'm pretty certain it should be exactly what's needed. I HAVE purchased that Variable speed switch AND the circuit board.. NORMALLY up to $150 (for the board & the switch) but it's also available on eBay $39... and it works fine... nothing to solder, just unscrew & replace parts... Good luck... I"ve done this a few times and it's REALLY quite simple.
Arrow Electronics Global Electronic Parts Distributor
Leading authorized distributor of...
SOURCE: my vitamixer's variable speed switch is stuck on
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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How do you open an MP Vitamix blender.
There are no visible screwy.
Just a small horizontal slot on the front of the base.
John
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