As far as I know, the 8640B has a 3 phase motor for the fan, and one of the power supply boards contains the driver and speed regulator circuits for it. Unless, of course in your unit it has already been replaced by something else.
Szabolcs
Henry Newton <EequalsIR@...> ezt ¨ªrta (id?pont: 2020. okt. 12., H, 23:04):
Hello all, I've just ordered the brass gears from the eBay fellow in India.? Many thanks to all who presented the gear information. While waiting, I need to replace my noisy fan in my 8640B.? From the red & black leads going to a nearby board, it appears it is a 5V fan.? My fan has a black colored motor. Any ideas on the CFM?? Or a fan source?
