ICON MC1648DLS ZC0549 Treadmill Motor Control Board Resistor Identification

MaxHeadRoom

Joined Jul 18, 2013
22,855
If the motor rotates at the correct speed when it is running OK, usually you can discount the Mosfet.
These also have a H.V. DC ramp up and down via a SCR.
So when start and stop, the this ramp should be measurable.
The only other load on the Mosfet is the D13 BEMF diode.
Max.
 

Thread Starter

Tallen1750

Joined Nov 12, 2020
15
I’ll test the rectifier output and see if I can measure the ramp. How much voltage delta are we talking about? Is the ramp 2 volts or 20? Should I measure directly on the rectifier or somewhere downstream on the board?

is there any special testing for the bemf diode or does it test like any other?
 

Thread Starter

Tallen1750

Joined Nov 12, 2020
15
The upper control console has the speed adjustments and sends the pulse modulation single to the motor controller. Could anything be wrong with that signal that is the route of my problem. It’s a square wave I believe and I don’t believe my meter will measure that. Just wondering if the signal could be dirty or erratic causing downstream issues being both boards have burnt out with same problems.
 

MaxHeadRoom

Joined Jul 18, 2013
22,855
Generally a meter test of the diode should do it.
The SCR voltage ramps up to full DC, typically 100vdc plus.
I doubt the PWM control in is causing it, the micro is fussy about the signal.
Max.
 

Thread Starter

Tallen1750

Joined Nov 12, 2020
15
I’ll test both this evening and report back. Thanks.

One more point I forgot to mention earlier. Both boards and both motors exhibited subtle isolation while running. Noticeable at all speeds but most prevalent at low speeds. I watched the voltage supplied to the motor with a meter while running and the oscillations coincide with voltage fluctuations of a few volts back and forth.
 

testure

Joined Jan 7, 2021
1
It's completely burnt out and unidentifiable. Does anyone know what this is? I want to try and purchase one and solder it in
I'm a bit late to the party here, but I have one of these boards sitting on my bench right now for other reasons and found this thread looking for a pinout diagram (which apparently does not exist out in the wild)- this R36 resistor reads 11ohms on my multimeter, but the bands are (to my aged eyes) brown, black, black, gold which would put it at 10ohms (which it probably is, once you consider additional resistance from the multimeter leads, etc).
 

MaxHeadRoom

Joined Jul 18, 2013
22,855
There are many versions of the MC2100 board, all have slight differences and resistor values etc, some circuits, although performing the same function, are slightly different.
On one MC210 REV B R36 is Red.Red,Blk , 22Ω
What is the part No./Ver of your board?
Max.
 
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