Evolution of the Apple Mouse

I did a lot of tests on the old board before I ordere a replacement (of course). The circuitry is all directly connected ot the power line, and my bench isolating transformer is not large enough to run a washing machine, so I was somewhat limited in the test equipment I could use, but I proved it was the mcirocotnroller, als... I don;t think you can get them either. Even ones that seem to have a mechancial timer don't. Oh, they have a knob that goes round as the cycle progresses and which has cams to operate switches, but the motor that drives it is controlled by a microprocessor. Foo!. Indeed... Old washing machine has one main motor. It's a capacitor start indcution motor with a centrifugal switch to cut out the starting winding when it's up to speed (and a feedback wire from the switch to the timer so the thing only carries on when the motor is up to speed). The pump is on the front of that motor, direct drive. There's a 2-speed gearbox on the back to get the faster speed for spin drying, and a solenoid to select the gear ration. Nice and simple. The new washing machine has a shaded-pole motor for the pump (only). The drive motor is a brush-type DC motor. It has 7 wires coming out of it -- 2 to the burshes, 3 to the (tapped) field and 2 from a tachogenerator. The motor control PCB has relays to select the field tap (fast or slow speed range), swap ove the bush connections (reverse the motor) and motor enable. And a triac for fine speed control. There's a custom microcontroller that takes a bit-serial command from the timer microprocesosr (alas details of the cammands are not on the wiring diagrams or parts lists), takes feedback fro mthe tachogenerator, and controls the relays and triac. And you know, I don;t think it gets the clothes any cleaner... -tony