Help requesting in identifiing components - Page 1
Forum section: electronics / repair

author: buzzawak
author_rank: Contributor
timestamp: September 08, 2019, 01:59:34 am
content: My Proform treadmill decided to stop working and I took it on myself to repair the controller board which is an MC2100E Ver A 2003.Having purchased a nice new dedicated capacitance meter I decided to pull all the cap for testing and noted down their value and location in a table on the computer.Eventually found an open 360ohm resistor off the TD3052 random switching triac. Go to return replace the caps and I can't find my list on the computer.I have spent the last week scouring the internet for pictures and info endeavouring to work out where each cap belongs.Trying to sus it out with my limited electronics knowledge, U5 is a IR21271 and in a typical layout has a cap across pins 1-4 and 5-8I think (from a bad photo) that C20 which goes to pins 5-8 is 100uf so it would be a fair assumption that C24 which goes to pins 1-4 would also be 100uf.So I have 4 caps left and have come to a standstill.C11C8C9C4Looking for some assistance?The caps I have are 1 x 100uf, 2 x 10uf, 1 x 22uf

author: SMdude
author_rank: Frequent Contributor
timestamp: September 08, 2019, 03:46:44 am
content: Well, I'll take a stab at this!C8 and C9 10uf, looks like some kind of filter?C11 22uf, output of regulator to supply of Micro?C4 100uf Possibly a power input bypass capHowever, C8 could be the 100uf, as it looks like they have a dual pattern for an axial lead capacitor.I'd try my first suggestions and if something isn't working right, then try this:C8 100ufC9 10ufC4 22ufC11 10ufIn reality, I don't think the value for C4 and C11 are all that important, if you have problems it will most likely come from the values of C8 and C9.Cheers

author: Psi
author_rank: Super Contributor
timestamp: September 08, 2019, 05:45:34 am
content: Dunno if this will help at all, i dont think its the same model.. buthttps://www.reddit.com/r/AskElectronics/comments/4zrr8m/nordictrack_controller_mc2100lts_resistor_flames/

author: Psi
author_rank: Super Contributor
timestamp: September 08, 2019, 05:49:38 am
content: https://forum.allaboutcircuits.com/threads/mc2100-treadmill-motor-control-circuit.100678/page-2This one looks the same.but cant really read anything.

author: Psi
author_rank: Super Contributor
timestamp: September 08, 2019, 05:54:25 am
content: Could ask these guyshttps://www.treadmillsrepair.co.uk/If you google image search their URL and MC2100 you find lots of images. (not zoomed in enough to see values)So they obviously know about them.

author: Psi
author_rank: Super Contributor
timestamp: September 08, 2019, 05:56:14 am
content: This might be the full schematic.https://www.scribd.com/doc/130813369/MC2100-Rev-Engrd

author: buzzawak
author_rank: Contributor
timestamp: September 08, 2019, 11:04:47 am
content: Hi Psi,I came across the diagram on another forum, unfortunately, it is of a different model and is not complete.

author: buzzawak
author_rank: Contributor
timestamp: September 08, 2019, 11:07:04 am
content: Quote from: Psi on September 08, 2019, 05:54:25 amGreat find, I will shoot an email off to them.

author: buzzawak
author_rank: Contributor
timestamp: September 08, 2019, 11:11:01 am
content: Quote from: Psi on September 08, 2019, 05:49:38 amMost of the photos are from am overhead shot and the resolution is too low to make out the values.But thanks for looking.

author: buzzawak
author_rank: Contributor
timestamp: September 08, 2019, 11:14:58 am
content: Quote from: SMdude on September 08, 2019, 03:46:44 amThanks, SMdude, I think I will just have to bit the bullet and have a try, They are all 16V caps so won't do much damage if I get it wrong.

author: narkeleptk
author_rank: Contributor
timestamp: September 08, 2019, 11:53:30 am
content: Doesn't really help you in this case, but always take pictures of your projects before you take them apart.

author: buzzawak
author_rank: Contributor
timestamp: September 08, 2019, 12:06:00 pm
content: Quote from: narkeleptk on September 08, 2019, 11:53:30 amBut I did, unfortunately not from the right angle, LOL

author: Psi
author_rank: Super Contributor
timestamp: September 08, 2019, 12:25:25 pm
content: Quote from: buzzawak on September 08, 2019, 12:06:00 pmIf you look at the caps in your image, the pattern on the top is not in the same rotation for all caps.Some look like a + while other an X.They are all mounted with the 2 pins vertical so this is a physical difference between caps (probably cap values).So you can rule out some caps going in some places.

author: buzzawak
author_rank: Contributor
timestamp: September 08, 2019, 12:28:00 pm
content: Quote from: Psi on September 08, 2019, 12:25:25 pmYou bloody genius. I will let you know how it goes.

author: buzzawak
author_rank: Contributor
timestamp: September 08, 2019, 01:15:48 pm
content: Cross-referencing the cross on the top and another photo from the side showing how high up the side of the cap the negative marker is.we have a resultPSI I owe you a beer!

author: Vcky_electro
author_rank: Contributor
timestamp: September 08, 2019, 02:04:46 pm
content: HiIm new to here. I have doubt. If the board is not working. Why have to remove capacitor and check those capacitance value ??We usually doing below check for debugging.1.Have you found any short across capacitor ?(I mean any cap damage)2.Is the power supply are okay?3.Is the control signal for the IC is properly connected? or found any IC damage?Awaiting for you reply...Thanks.Vcky

author: Psi
author_rank: Super Contributor
timestamp: September 09, 2019, 12:15:29 am
content: Quote from: buzzawak on September 08, 2019, 01:15:48 pmCool. As long as that other photo is one you took of your board.Another board of the same model will have caps from different production batches and may look totally different.

author: buzzawak
author_rank: Contributor
timestamp: September 09, 2019, 10:26:50 pm
content: Quote from: Psi on September 09, 2019, 12:15:29 amIt was a photo of my board from a different angle and you could see the negative mark on the side.

author: buzzawak
author_rank: Contributor
timestamp: September 09, 2019, 10:43:40 pm
content: Quote from: Vcky_electro on September 08, 2019, 02:04:46 pmHi Vcky_electro,I checked that the board was getting a PWM signal and the DC motor was working using a 12V motorbike battery.That just left the motor control board.The Incline section of the motor control board was working so I knew that the power supply was working.I usually check transistors, capacitors, resistors in that order. and found an open 360ohm resistor.I got myself my first capacitance meter so wanted to test it out.The board is 16 years old so decided to freshen it up with new caps (the smaller ones anyway)I did a table on the computer listing the parts and their location but misplaced it somehow.