NordicTrack Treadmill Motor Controller model MC2100ELS, Control Board Power Supply dead now repaired.

I received a phone call from a client who wanted his treadmill control board checked by a technician.

I scheduled him the following day since I was busy at the time.

The following day I visited the company where he works, the treadmill was used as the worker's gym facility.

On arrival, I found the board was already taken out of the treadmill and in his office.

I did some initial tests and found IGBT (K50DDTP), an Insulated-gate bipolar transistor dead short.

I tested other components and all looked good according to my meter, Customer pointed out that the main circuit breaker tripped when the treadmill was powered.

 

 Here is the transistor K50DDTP which was a dead short collector-emitter junction.

I could not get this part and I therefore ordered it online from AliExpress.com. It took 8 days to ship to Kenya since I used expedited shipping.

Once I got the part I went back to the customer who was very happy to see me  back with the important part.

I replaced the part and was taken to the gym room to do the testing. I re-installed the board slowly and carefully and now was time to test.

I realized the power board is not powering on and noted the plug fuse was also gone. I replaced it and after applied the power I saw smoke and a ball of fire from the board I had just installed.

I was pretty sure the transistor has gone again but I had imported 5 pieces so I was not very worried though I was concerned about the component which triggered this.

I tested the same transistor in circuit and sure I heard a beef, I took the board out again and testing the board out of the system realized the part survived and 2A fuse died a painful dead(blackened).

So what caused the big short which caused this fuse to blow? I decided to replace the 2A fuse and re-install the board but leave the treadmill DC motor out as you can see below.

I applied the power to the treadmill and this time no issue was detected, I was also able to log in and the display was okay.

 This led me to conclude the motor is shorted and needs replacement.

Again, this part is not readily available in my local market, and I am still searching from second-hand shops.

Visit our Nairobi office here or Contact us on +254 733 475 040

Thank you guys

 See you in the next class