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FoulkesBrau #63 - Another Trojan treadmill control board - B307D 

FoulkesBrau
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In this video Craig takes a look at another control board for a Trojan treadmill. I show you how to diagnose the fault in real time without all the usual blab. The board number is B307D.
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As always, comments and suggestions are welcome in the section below. I will do my best to respond to each and every one.
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====* Disclaimer *====
I do these things at home so that you don't have to. Electrickery can kill you! 💥☠️
If you insist on trying these things yourself, I and/or any company and/or person that I am affiliated with cannot and will not be held responsible for any damages, loss of life and/or injuries that you may incur and/or cause to those around you. Simply put - you do this at your own risk. ☠️
I am doing this to raise the capital needed to start our own brewery.
I do not do electronic repair as a profession - I work in the Control & Instrumentation engineering field. I have however worked in electronics repair many years ago. I take these repairs in to fulfill the point mentioned directly above and to keep my hands and eyes in as technology changes.
Please do take care when working with live circuits. Mains voltage 110/230VAC at 60/50Hz has the potential to kill you. 💥☠️
All #craftbeer is reviewed against the #BJCP 2015 style guidelines and the style as published on the label of the beer. If your #beer is labeled as a lager but brewed as a Weißbier - I will rate it as a lager. Don't get upset with me - you as the brewer should know better. I am not here to guess the appropriate style for your beer.
I buy the beers myself and do not review any beers that are sent to me by commercial brewers. I will however rate beers that are brewed by other home brewers from time to time.
All thoughts, views and opinions are purely my own and not necessarily those of anyone I am affiliated with.
====* Tips *====
* Don't work in isolation. Always try to have someone that will check up on you periodically or even better keep an eye on you. Accidents happen in the blink of an eye. 👍
* Make sure the person watching over you has no direct benefit from your demise. There is no point in adding temptation to the mix. This would rule out wives,whether past or present, mistresses and most girlfriends. 🤣
* Remember to check that those bulk storage capacitors are discharged, they can hurt you badly and have the potential to kill you.
* Don't skimp on your test equipment. Always buy the best quality you can afford. There is a reason why professionals use multi-meters like Agilent, Brymen, Fluke etc. All the functions in the world mean bugger all if the meter blows up in your hands and kills you because it is not designed safely. 💥☠️
* Alcohol abuse is a serious disease. Don't drink and work on live circuits. Alcohol impairs the ability to make sensible judgments. This point applies to other facets of life too, or so I've been told.
* When caught going down the rabbit hole, walk away and come back another day. Sometimes a fresh perspective is all that is needed to find that elusive fault.
* Cats are good for your mental health - adopt - don't buy. And no, mine are not up for adoption. 🙉🙈🙊
* Life is too short - always try to see the lighter side of things. You may just find that you have a smile on that dial, sometimes. 🤫

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28 ноя 2021

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Комментарии : 38   
@treadmilldoctorgh2607
@treadmilldoctorgh2607 4 месяца назад
Awesome learning you are best keep it up
@ZENERVOLTAGE
@ZENERVOLTAGE 2 месяца назад
30:00 250 volts on the bridge rectifier output is because the large relay actually switches the bridge rectifier. Only when the large relay is switched on, will you get full rectified voltage.
@GYMTURBO
@GYMTURBO 2 года назад
Thank for your support
@ZENERVOLTAGE
@ZENERVOLTAGE 2 месяца назад
I've recently been working on these boards and some larger versions of the same circuit for a treadmill engineer. I too came across a blown MOSFET, then measuring the 12V output at the connector, I got a stable 12.26 volts. I have another identical board, that I've checked thoroughly, which has zero shorted components...but it was marked as a faulty board and not working when fitted. I'm getting very different thermal imaging of the "faulty" board, in comparison to the board with the stable 12.26V output. Good board has an input voltage of 16volts on the LM812 voltage regulator... however the bad board has unstable input to its LM812...bouncing from 10v to 13v. The bad board TL431 is getting hot, but is not faulty, as even after changing exhibits the same symptoms. The good board TL431 is not heating up at all under thermal camera. After testing literally every possible component, I suspect the issue with the bad board and other boards lies within the vertical circuit board that is potted in resin compound. There are 4 ICs on this small board and in my case 1 of them is definitely a PWM chip for switching the transformer. This is my guess as to the cause of unstable 12v output at the connector.
@foulkesbrau3085
@foulkesbrau3085 2 месяца назад
Hi there, I suspect it is the vertical potted board. Cheers Craig
@ZENERVOLTAGE
@ZENERVOLTAGE 2 месяца назад
@@foulkesbrau3085 Thanks Craig. It actually turned out to be a strange one. The board began to turn on and off as I moved the PCB. I knew it was a connection issue...but it was VERY hard to find. Turned out to be an internal connection issue across a 2 MegaOhm resistor. Only found it because it finally failed open. Thanks for your help though, I took thought it was the potted board. Glad it wasn't or it'd be game over.
@GlennHoweTeam
@GlennHoweTeam Год назад
Hello, I've used quite a few older tread mill boards and most of the older ones have an input plug for use with a variable resistor (knob for speed control). What pins (if any on this board would one use a variable resistor to control the output speed)?
@foulkesbrau3085
@foulkesbrau3085 Год назад
Hi Glen, It’s been a while, but if I remember correctly, there is a separate mcu in the control panel on the handle bars that controls the speed via serial communication. The MCU on this board controls the FET with PWM with a driver IC. So I suspect you will not be able to use a pot to vary the speed. Cheers Craig
@kallibrand4106
@kallibrand4106 2 года назад
Hi Craig , your videos are really informative . I have a trojan dcmd67 board that is still in good condition . I would like to know whether i could put a potentiometer on it to control the motor for my drill press . Hope you can shed some light on it for me .
@foulkesbrau3085
@foulkesbrau3085 Год назад
Hi Kali, You won’t be able to do that directly as far as a I can remember as the FET is controlled by PWM from a microcontroller. Not all is bad though, if you don’t need the microcontroller functionality, you would be able to use a pot with a 555 to vary the PWM which you could then feed to the FET driving circuit. Let us know how you come along. Cheers Craig
@screem121
@screem121 4 месяца назад
Hi i have question what is the serial number of this regulator triode on the board near the relay , it's burend and i can't read it
@andredeschamps1587
@andredeschamps1587 2 года назад
Hi Craig: Great to see you back!!!! Thank you again for taking your time to make these video's. I am especially excited to see your video's when they come up since a lot of them are related to exercise equipment board repair. I have a couple of questions if you have the time to answer. I'm still trying to wrap my head around how the output of these boards work. I usually work on AC boards which have a VFC output, control the frequency to control the speed. These are DC (I am assuming) with either a brush or brushless motor. So is the output vary the voltage to control the speed? Is this done by a chopper circuit, I guess like a PWM control? Or is there somehow frequency control incorporated that I am not catching??? The other question is if they are a PWM control that changes voltage to change speed, why do you measure an output at all??? Shouldn't it be 0 volts if there is no user panel hooked up and a user selecting a speed??? Since there is voltage at the output, would that mean the motor would run even if it is not called for??? Color me confused >--%
@foulkesbrau3085
@foulkesbrau3085 2 года назад
Hi Andre, Glad you're enjoying the videos. I have a very interesting one to make this weekend not an exercise board though. So I'm guessing that the FET will control the motor with PWM as this would be the most logical mode of operation. I cannot be sure as I did not upload the code for the micro controller and reverse engineer it. I have however had a look at the datasheets for one of the boards micro controllers and one of the features was PWM control. So I presume that this is how all these boards are working. I don't think they would be using variable frequency on top of PWM. One day I will hook up a scope to my own treadmill and then we can know for sure. What I have picked up with some of these control boards is that the micro pulses the FET every now and then. I presume they are doing this to measure that there is a tiny current flow. This would indicate that the motor is there and that it is not open circuit- this would be why I measured voltage on the motor terminals. Cheers Craig
@andredeschamps1587
@andredeschamps1587 2 года назад
@@foulkesbrau3085 Thanks again for the detailed explainaton. That makes absolute sense, that it would be sending out a microamp signal, Thank you for helping me undersand that part of the puzzle. I so appreciate the work you do to help us with these boards. All the best to you and stay safe!!!!
@foulkesbrau3085
@foulkesbrau3085 2 года назад
👍 No worries. The next video I will show a very elegant latching circuit because I bought the wrong type of mechanical switch. 🙈 It’s getting painful here in SA to get components into the country. So we must make go with what we can get our hands on. Cheers Craig
@dindro9778
@dindro9778 2 года назад
Hello sir is that igbt(IRG4PC40UD) working fine and turning on the motor ?? I have the same problem. My original igbt was G4PC40U and it was shorted but I couldn't find the same one for replacement only the IRG4PC40UD was available. it has some diode feature built in it. In my case I am getting around 320v dc on the bridge rectifier and 150v dc on the motor terminal and 0volt on the igbt's collector to the emitter only when there is no load in the motor (M+,M-) terminal. As soon as I attach a load like 100w bulb or the original motor, the relay give a click sound but when I press the start button it don't give any output to switch on the load. Then I get 320v dc on bridge rectifier, 0 volt dc on the motor terminal and around 300-350v dc from the igbt's collector to the emitter. What could be the problem ? Is that the igbt's fault or relay's contact problem or something else in the board ?
@foulkesbrau3085
@foulkesbrau3085 2 года назад
Hi, I would start by checking that the control signals from the keypad board are actually getting to the control board. Then you can work your way back. Like is the gate being driven? Cheers Craig
@deljofrancis9349
@deljofrancis9349 3 месяца назад
Can u auggest a equallent componet of NCE30th60bp mosfit
@ZENERVOLTAGE
@ZENERVOLTAGE 2 месяца назад
GW39NC60VD is on a lot of these boards... basically the same properties.
@CS7AFM
@CS7AFM Год назад
Hi Craig, congrats on your videos. Could you please help me I'm getting crazy ehehe I've got the error 12 "E12" on this board do you know what is this error? I got T520A treadmill using B307D board. thanks for all your help. best regards :)
@foulkesbrau3085
@foulkesbrau3085 Год назад
Hi there, Check all the lubrication is fine and that your motor is ok. As far as I can see - that is an overcurrent error.
@carobnjak75
@carobnjak75 4 месяца назад
Hello, I am having the same error E12 on the same machine Domyos T520A. The treadmill start to run, but stops after few seconds. I filmed it ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-u_kZmdtVl8k.html. Have you managed to figure it out?
@pepecastro73
@pepecastro73 Год назад
Hi, I'm from Argentina and I'm trying to repair the same board, when I measured the same fuse that I measured with continuity, it doesn't have continuity, I suppose I should try changing it, I was thinking of making a jumper to test it but I don't know if it's recommended, what do you recommend? Thank you very much for the video and I look forward to your advice greetings from Argentina
@foulkesbrau3085
@foulkesbrau3085 Год назад
Hi there, Please do not make jumpers for fuses. Rather replace with the correct fuse. If the fuse has blown - you may have a short circuit. Cheers Craig
@ramheyhey
@ramheyhey Год назад
I have this exact same board and it seems to have crapped out. I'll need to find someone to play around with it.
@screem121
@screem121 4 месяца назад
I need your help if u have same board can you locate this transistor near relay and read me the serial number because I can't read it it's fully burned i appreciate your help!!!
@foulkesbrau3085
@foulkesbrau3085 4 месяца назад
@screem121 Sorry, I don’t have access to the board anymore.
@deljofrancis9349
@deljofrancis9349 5 месяцев назад
Sir I have same board .it's working good but after 6 km/h speed .speed doesn't increase.can u help me to solve the issue
@foulkesbrau3085
@foulkesbrau3085 4 месяца назад
Hi there, It may be that the encoder that picks up the speed is faulty? Cheers Craig
@deljofrancis9349
@deljofrancis9349 3 месяца назад
How to clear that issue .can u explain plz
@deljofrancis9349
@deljofrancis9349 3 месяца назад
I didn't understand what is encoder
@foulkesbrau3085
@foulkesbrau3085 3 месяца назад
Hi there, On the side of the treadmill is a round plastic thing with segments in it. There is an encoder that counts those segments to get the speed. Cheers Craig
@deljofrancis9349
@deljofrancis9349 2 месяца назад
But speed sensor is working properly
@johndavie9921
@johndavie9921 2 года назад
Hi Craig, I have been trying to contact you so I can get the courier to collect this board.
@foulkesbrau3085
@foulkesbrau3085 2 года назад
Hi John, Sorry for the long delay - but I have been out of it for a while. I am however back. I will leave your board with Bianca - our receptionist tomorrow. Cheers Craig
@philanindlovu246
@philanindlovu246 Год назад
@@foulkesbrau3085how much do you services cost?
@foulkesbrau3085
@foulkesbrau3085 Год назад
Hi Philani, I don’t normally charge for repairs as this is not what I do for a living. I have taken on repairs for colleagues and viewers before, they just payed for the parts and s case of beer. And courier costs of course. This didn’t work so well as I do not do this for a living and do not work to anyone’s schedule. I have not made a video in a long while, and I do need to make one explaining the break, what happened and where I am now. That being said, perhaps you could tell me a bit more about what you would like done and where you are based and perhaps we can come to an agreement? Cheers Craig
@alchemy1
@alchemy1 2 года назад
Too bad a person can not use an air compressor to blow that melted lead right off. Heat and burst of compressed air. I have tried it. Nope. The instant that air hits the solder, in microsecond the lead silidifies, splatters on the board at best.
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