MC2100ELS treadmill repair

Thread Starter

Wake

Joined Jul 2, 2023
7
Hello guys.
After a blown irgp4063d replacing motor is not running. The console seems to be ok.It sends pulses on the blue wire to the control board. The opto isolator on the control board that receives PWM is also fine. 14km/h 5v on pin3 , 0km/h 0v on pin 3 and so on.
After opto isolator the sqare waves goes into ic (I really cant read it) and after ic from another pin speed signals should feed an IRS2127 driver on pin 2, but there is nothing. Any help? Please.
What will happen if I bypass the unknown ic and short a wire from opto to driver?
 

MaxHeadRoom

Joined Jul 18, 2013
28,768
The PWM on pin 4 of HD2 is the PWM signal, and the indication that the Micro-processor receives it from the Opto, is that the LED should start flashing slowly and steady.
Not sure which "Unknown" IC it would be?
 

Thread Starter

Wake

Joined Jul 2, 2023
7
Thanks dude, the led flashes 8 times pause and 8 times again... and so..
The unknown IC is the micro processor I belive, it receives speed signals for sure, but it doesn't send them to IRS2127 controller.
The diagram of mc2100els control board differs from mc2100 diagram wich is shared here. It's really different at power cirquit from mc2100.
 

MaxHeadRoom

Joined Jul 18, 2013
28,768
There is at least 6 versions of the MC2100, all bear some resemblance to each other, just not identical.
The fact that there is two processors, one in the console and one on the MC2100 board, Testing the MC2100 on the bench first with a PWM signal into pin 4 makes it easier to pin down.
 

Thread Starter

Wake

Joined Jul 2, 2023
7
It's all done, there is no sqare waves from processor to IRS2127. I'm blind in investigating the processor, ...there is a pin called "fault" in IRS2127......and that's why I'm here.
 

MaxHeadRoom

Joined Jul 18, 2013
28,768
The problem is that due to the many variations of the MC2100, they all have to be treated individually, using the reverse engineered copy as a starting point.
As previously mentioned, it is much easier to do bench testing of the main board using a PWM signal input.
The main processor monitors a few functions.
 

Thread Starter

Wake

Joined Jul 2, 2023
7
Thanks again.
You mean to use a separete pwm generator?
There is pwm pulses from console I can even here it near the control board. It's hi fr. sound like a buzzer and when I set the speed to 0km/h it stops. The pulses trigger the opto and it sends sqare waves to the microcontroller(measured using voltmeter).
So the microcontroller receive sqare waves through pin 2 and has to send waves to the IRS2127 through pin 8, but there is nobody at pin8. Something is telling the controller to stop the motor.
I am realy curious what will happen if I bypass the controller and feed directly the IRS2127?
 

MaxHeadRoom

Joined Jul 18, 2013
28,768
It basically eliminates any feed back to the MC2100 from the console processor.
IOW, it is easier to work on and find out the board problem when it is isolated.
 

Thread Starter

Wake

Joined Jul 2, 2023
7
Just to finish ...
And may be save somebody in the future.
As I ask here and don't get an answer of my question: "what will happen if I bypass the processor and feed directly the IRS2127" I decide to give it a chance.
First try with bulb (not led) instead motor: perfect ... brighter with speed increasing.
Second try: treadmill motor - instant cirquit breaker down. (20A)
3. Feed the motor with milwaukee m18 battery - motor runs OK
4.mystery mystery mystery
5. Feed the motor with autotransformer 0 -100 V and rectifier - runs OK but eats 9A and white sparkling at just 40V (the label says 130V) and loses power if I step on belt.
6. Take the motor to a specialist to find if there is a shorted windings in the rotor - No, no shorted windings.
BUT DEMAGNETIZED PERMANENT MAGNETS ON STATOR.
That is the reason and everything else is consequence.
I really hear for the first time about this kind of dc motor problems.
New motor (if I find one)will solve the problem.
Thanks and good luck.
 

MaxHeadRoom

Joined Jul 18, 2013
28,768
- No, no shorted windings.
BUT DEMAGNETIZED PERMANENT MAGNETS ON STATOR.
It is very unusual for these modern motors to become demagnetized, the Chinese have a ready source of rare earth magnetic materials.
These do not easily lose their magnetic properties compared to the older style materials.
 
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