Chosen Solution
Where can I find the schematics for a Kenwood chef model A701A in order to restore this machine?. Mike Jordan.
I have probed my A701A and looked at one of the relevant patents. My provisional schematic is here . As I say there, it is only guesswork based on probing with a simple multimeter without C and H ranges in circuit. On my machine, it has become clear that the only problem was that the “points” (the centrifugal switch) no longer closed when the motor was not running. It was easy to remove the retaining screws and bend the copper support a little. The relevant patent (best in pdf) is US3701935.pdf. I can’t for the moment find where it was freely available, but avoid some of the suspicious sites that seem to want to charge or collect information to download it. That patent by Prof Collie is about adding a triac to the circuit precisely to reduce wear on the “points”.
I found this on Google! Hope this helps Clive Harlow
It appears the gear does not engage….
Well, I don’t remember much about this from so long ago, but there is a diagram on page 22 of the A701a service manual, and I have a photograph that I took of the switch itself. I can’t remember where I found the manual or whether a link was posted in another thread. The manual is dated December 1976 and I haven’t noticed a copyright notice. I doubt that it is still (or ever was) incopyright. Try duckduckgo on “A701a service info”. Not sure what you mean by calibration unless you are refeering to the two adjustment screws. I think that too has been covered in other threads.
