My previously reliable Kenwood mixer (KM300) has just decided that it has only one speed - fast. I've googled, but haven't been able to find any on-line diagrams of its internals. Could anyone here point me in the right direction?
S Viemeister :
FWIW when I last looked at one of those the speed control was mechanical. Turning the speed down opened a gap between two bits of metal which I assume had some magnetic effect. It could be something as simple as a broken link.
Triac gone mate
the circuits are pretty simple and spares are available.
Or the mechanical linkage in the knob. I have to take ours apart every so often and push it back together again.
I just got around to repairing mine (discussed here in March). I got a kit consisting of two capacitors, a resistor, and a triac from:
-- Richard
I think they stopped using that method some time in the
1960s/70s.
No, it?s a govenor, similar to the diamond shaped thing with two balls at the corners used in steam engines. The two bits of metal are contacts; as it spins faster they open up and disconnect the power. Crude but effective (and you really have to hope the suppression circuit does its job). I?m still using an A701 that works this way.
Mine dates from 2003, so likely has a little PCB in it.
Some might be, but this wasn't.
On mine, which is a 60s/70s model, a mechanical cam compresses some kind of conductive rubber, which acts as a variable resistor to drive a triac.
see
the spindle is IIRC the green thing bottom right, and the triac can be seen centre slightly left.
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