Hi All,
I have a old treadmill with very strange issue. Treadmill is working fine on small speed (up to 10km/h) ,but when I increase it treadmill shakes and motor stops. ( probably it will happen the same with lower speed if I would be walking on it )
Motor is ok - as I have tried this board on different treadmill - was the same issue.
Cant find any schematics but this board is similar to MC-65 or 60 schematic attached.

I have tested all diodes + resistors (in the circuit )

What I replaced so far was :
Thyristors - Q3, Q2
DIODES - D13 D15 D16
MOSFET - Q5
MOSFET DRIVER U4
OPTOCOUPLER - U2
AMP - U3
REG - RG1
Q4 and U3

It is impossible to buy this board anywhere so I have to repair it , not many components left to replace .



Thanks in advance

Kamil

 

Just an observation, D13, D15, Q3 & Q1 centre pins are not soldered to the copper. (Top surface).
Good luck.......

 

Just an observation, D13, D15, Q3 & Q1 centre pins are not soldered to the copper. (Top surface).
Good luck.......

Thanks , yes they are

 

Hey kamilple,

i have the same issue here, treadmill is working on the 2 lowest speeds, but increasing the speed the motor stopps.
- I've tested too all resistors, diodes, transistors and electrolytic capacitors (replaced C22 - 47uF, ESR was a little bit high, but didnt resolve the issue). All seems ok.
- Tested 5V on AT uController, was a little bit unstable, added 100nF Capacitor, but no luck.
- 300V HV BUS: stable, no sign of voltage dropping when starting the treadmill.
- shorted R42 Current Resistor to check if the controller stops because is detecting overcurrent, no luck

Do you have found the issue on your MC2000 board controller?

Thanks a lot, holbeneine

 

Hey kamilple,

i have the same issue here, treadmill is working on the 2 lowest speeds, but increasing the speed the motor stopps.
- I've tested too all resistors, diodes, transistors and electrolytic capacitors (replaced C22 - 47uF, ESR was a little bit high, but didnt resolve the issue). All seems ok.
- Tested 5V on AT uController, was a little bit unstable, added 100nF Capacitor, but no luck.
- 300V HV BUS: stable, no sign of voltage dropping when starting the treadmill.
- shorted R42 Current Resistor to check if the controller stops because is detecting overcurrent, no luck

Do you have found the issue on your MC2000 board controller?

Thanks a lot, holbeneine

Hi ,
sorry but no , I couldn't repair it.

 

Thanks for the quick reply

 

Hello,

i think i found the issue with my MC-2000ES:

it was the R4 Resistor. It was a 22k and a second Resistor without marking in parallel. The second resistor had a measured value of 13,5k Ohm, which seems to me to be a non standard value. But it doesn't show signs of damaging or overheating.

I have bought online a used and working board. There is the smaller 22k Resistor too and 2 other, bigger 15kOhm Resistors, all in parallel. Which means 7,5k (2 x 15k in parallel), instead of the 13,5k before.

Replaced the 13,5k Resistor with the 2 from my board that i bought and the treadmill is working with the old board again.

Best regards, Kurt

 

Hello,

i think i found the issue with my MC-2000ES:

it was the R4 Resistor. It was a 22k and a second Resistor without marking in parallel. The second resistor had a measured value of 13,5k Ohm, which seems to me to be a non standard value. But it doesn't show signs of damaging or overheating.

I have bought online a used and working board. There is the smaller 22k Resistor too and 2 other, bigger 15kOhm Resistors, all in parallel. Which means 7,5k (2 x 15k in parallel), instead of the 13,5k before.

Replaced the 13,5k Resistor with the 2 from my board that i bought and the treadmill is working with the old board again.

Best regards, Kurt

thank you
great job!!!

 

Hello,

i think i found the issue with my MC-2000ES:

it was the R4 Resistor. It was a 22k and a second Resistor without marking in parallel. The second resistor had a measured value of 13,5k Ohm, which seems to me to be a non standard value. But it doesn't show signs of damaging or overheating.

I have bought online a used and working board. There is the smaller 22k Resistor too and 2 other, bigger 15kOhm Resistors, all in parallel. Which means 7,5k (2 x 15k in parallel), instead of the 13,5k before.

Replaced the 13,5k Resistor with the 2 from my board that i bought and the treadmill is working with the old board again.

Best regards, Kurt

This is amazing work and gives me hope of troubleshooting my own intermittent MC2000H motor controller board. I am curious if you and others created your own reversed engineered schematic first before you started checking components? The reverse engineering schematic work that I found for the MC60 was pretty cool and it doesn't seem like there exists something similar for the MC2000H.

 

Hi All,
I have a old treadmill with very strange issue. Treadmill is working fine on small speed (up to 10km/h) ,but when I increase it treadmill shakes and motor stops. ( probably it will happen the same with lower speed if I would be walking on it )
Motor is ok - as I have tried this board on different treadmill - was the same issue.
Cant find any schematics but this board is similar to MC-65 or 60 schematic attached.

I have tested all diodes + resistors (in the circuit )

What I replaced so far was :
Thyristors - Q3, Q2
DIODES - D13 D15 D16
MOSFET - Q5
MOSFET DRIVER U4
OPTOCOUPLER - U2
AMP - U3
REG - RG1
Q4 and U3

It is impossible to buy this board anywhere so I have to repair it , not many components left to replace .



Thanks in advance

Kamil

when you "tested all diodes +resistors (in the circuit)", did you have to desolder them first? Also do you or anyone else have an image of the reverse side of your MC2000 board? Thanks!

 

Keep in mind, there are at LEAST 5 versions of the MC2100's but all have many similarities in functioning.

 

Hey kamilple,

i have the same issue here, treadmill is working on the 2 lowest speeds, but increasing the speed the motor stopps.
- I've tested too all resistors, diodes, transistors and electrolytic capacitors (replaced C22 - 47uF, ESR was a little bit high, but didnt resolve the issue). All seems ok.
- Tested 5V on AT uController, was a little bit unstable, added 100nF Capacitor, but no luck.
- 300V HV BUS: stable, no sign of voltage dropping when starting the treadmill.
- shorted R42 Current Resistor to check if the controller stops because is detecting overcurrent, no luck

Do you have found the issue on your MC2000 board controller?

Thanks a lot, holbeneine

any chance you can post an image of the bottom side of your MC2000ES board? I'm interested in reverse engineering a schematic.

 

any chance you can post an image of the bottom side of your MC2000ES board? I'm interested in reverse engineering a schematic.

Hello

of course. Attached is the requested image from a MC2000ES Board.

My answer to your previous question: No, I have not drawn my own schematic.

I have tested almost all the resistors/diodes in the circuit, and this works for most of them. If the value deviates greatly, unsolder a leg and measure again. Electrolytic capacitors, on the other hand, I have desoldered all of them for a measurement.

Good luck, holbeneine

 

Hello,

i think i found the issue with my MC-2000ES:

it was the R4 Resistor. It was a 22k and a second Resistor without marking in parallel. The second resistor had a measured value of 13,5k Ohm, which seems to me to be a non standard value. But it doesn't show signs of damaging or overheating.

I have bought online a used and working board. There is the smaller 22k Resistor too and 2 other, bigger 15kOhm Resistors, all in parallel. Which means 7,5k (2 x 15k in parallel), instead of the 13,5k before.

Replaced the 13,5k Resistor with the 2 from my board that i bought and the treadmill is working with the old board again.

So, the resistor

Best regards, Kurt

Addendum: the resistance values apply to the 230V AC version. Other resistance values apply for 115AC.

The resistance value for R4 for 230AC input is 5k6 (3 resistors in parallel 22k // 15k // 15K)