treadmill energetics power run 1400 - Page 1
Forum section: electronics / repair

author: delire69
author_rank: Newbie
timestamp: September 14, 2023, 04:08:33 pm
content: Hello everyone,I would like to know if any of you would have or could redirect me to a site where I could find the documentation, electronic schematic on a power board of a treadmill whose reference is as follows; MT03B04H. I have two defective components and the reference is cleared... Q8 and D1, if anyone had the info it would help me a lotI've done some Google searches before but I can't find much.Thank you ,PS; sorry for my english, i'm french

author: fmashockie
author_rank: Frequent Contributor
timestamp: September 14, 2023, 05:13:54 pm
content: Here's a thread on what appears to be the same PCB on allaboutcircuits.com. It looks like there might be some photos of these components but you have to have an account to view them.https://forum.allaboutcircuits.com/threads/what-do-i-do-now.82017/page-2

author: delire69
author_rank: Newbie
timestamp: September 14, 2023, 05:38:21 pm
content: Thank you for your answerI saw this thread but unfortunately, no one gave a solution. One person had posted 2 links but they don't work anymore

author: fmashockie
author_rank: Frequent Contributor
timestamp: September 17, 2023, 01:18:03 am
content: Bummer. Do you see that vertical board soldered to the main board? Can you take a photo of that board to see what ICs are on it and attach in a post? Could be helpful in determining what kind of transistor and diode you need

author: delire69
author_rank: Newbie
timestamp: September 17, 2023, 11:52:14 am
content: yes I see, I don't have the card with meBut I will post that tomorrow during the day, thank you

author: delire69
author_rank: Newbie
timestamp: September 18, 2023, 07:07:47 am
content: hi,heres come the photos(There is another PCB on the back of the motherboard, I also attached the photo)thank you

author: fmashockie
author_rank: Frequent Contributor
timestamp: September 18, 2023, 01:45:38 pm
content: Wow they really made this board difficult to repair. It looks like they scratched out the identifying marks on some of the ICs as well.How did you determine there's an issue with that 'transistor'?

author: delire69
author_rank: Newbie
timestamp: September 18, 2023, 04:41:30 pm
content: As soon as I start the treadmill motor the 10A fuse blows.First of all I directly thought of these power components connected to the motor...and with a multimeter I found it in short circuit...it is possible that there is something else... that's why I would have liked electronic schematics, that would help me a lot and it would give the references of these componentsI have the impression that repairing this treadmill is going to be very complicated.thank you

author: fmashockie
author_rank: Frequent Contributor
timestamp: September 19, 2023, 12:22:55 pm
content: I gotcha. Well you removed the transistor from the board correct? You can check that transistor with diode test function on your multimeter. If you don't find any shorts, it is likely that the transistor is fine. Also, if you still have a short on the board, (and you've tested the transistor and it is fine), the problem lies somewhere else. So I would start there. 1) Test the transistor out of circuit 2) Check to see if you still have a short between the motor inputs on the board. When you don't have a schematic (these days most electronics do not come with schematics anymore), it is helpful to trace the circuit out by hand - it can be time consuming, but it is very helpful!

author: delire69
author_rank: Newbie
timestamp: September 19, 2023, 05:15:31 pm
content: Hi,thank you for your answer, indeed I tested the transistor and diode outside the circuit....it is in short circuit....I would like to trace the diagram by hand....but without the component references, complicated to replace them, I would have at least started by changing thatIt's a friend's treadmill, I don't have the motor at home... the problem, I think, is that my friend slightly exceeds the maximum weight accepted by the treadmill, which must have caused this breakdown: (

author: fmashockie
author_rank: Frequent Contributor
timestamp: September 20, 2023, 10:35:38 pm
content: Gotcha. But is there still a short circuit between the Motor + and - inputs on the board? Also, if you can trace the schematic out, just to where the transistor (likely a MOSFET) gate, drain, and source connect, you could possibly determine if it is NPN or PNP. Once you figure that out, you could just buy an MOSFET with high enough voltage/current ratings. It just might work. But that is likely your best bet. Without tracing out the schematic, you will likely not be able to fix this.