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M3VUV51 · 14th Oct 2021, 8:29 am

well pulled this apart again ,the pedal controlled a wiper on a carbon track on the pcb, i put a 300k resistor in series with it, the machine speed is nice and slow now with a slight push of the pedal, only thing I notice is the motor makes a growling noise at slow speed and gets hot after a couple of mins, the cooling fan is on the motor shaft so assume it's getting hot due to the low motor rpm, I've fitted a cooling fan from an old ps2 to the side of the motor housing, running from a smps fitted into the base of the machine, any idea as to the growling noise? i assume the motor is dc? thanks in advance.

14th Oct 2021, 8:29 am	#6
M3VUV51 Banned Join Date: Feb 2018 Location: Horncastle, Lincolnshire, UK. Posts: 203	Re: Singer 2502C pedal repair. well pulled this apart again ,the pedal controlled a wiper on a carbon track on the pcb, i put a 300k resistor in series with it, the machine speed is nice and slow now with a slight push of the pedal, only thing I notice is the motor makes a growling noise at slow speed and gets hot after a couple of mins, the cooling fan is on the motor shaft so assume it's getting hot due to the low motor rpm, I've fitted a cooling fan from an old ps2 to the side of the motor housing, running from a smps fitted into the base of the machine, any idea as to the growling noise? i assume the motor is dc? thanks in advance.