Reebok GT40s Treadmill power supply issue?

[R_J]

Re: Reebok GT40s Treadmill power supply issue?

Check that you have line voltage across AC1 & AC2, then I would check the DC voltage across the motor terminals M- & M+ , It is possible the smell came from the motor, The E2 error seems to point to no feedback from the speed sensor (motor not turning)
You could check the diode D11, and any others in that location.

[M.A.H]

Re: Reebok GT40s Treadmill power supply issue?

Hi All,

I have got the same treadmill (Reebok GT40s) but I have a different problem. My partner was using the treadmill but then the treadmill powered off. When I came in the room, I immediately smelled that electric component burning type of smell coming from the treadmill. I removed the power and let the treadmill rest for a while.

I powered it up after about an hour, the treadmill powers up, I could see 0:00 on the display but then it showed E2. The treadmill then starts to make a beeping sound every second or so from the speaker. When I press the start button, nothing happens, the E2 message is shown throughout with the beeping sound until I power off the treadmill.

I did call Reebok support to which they advised that it is highly likely that the motor control board is at fault. I did ask if it could be the motor, but they advised that it couldn't be it as the E2 message means a fault with the board. I was about to place an order for the board, but they are currently out of stock. I asked when the stock would arrive, but they weren't sure and just said it could be weeks.

After googling treadmill errors and faults, I came upon this thread and thought I'll open the treadmill to see if there any noticeable burnt components on the board.

The board itself looks good as new, there are no burn marks at all, I even took it out of the metal housing to see underneath but it's all clean. I did notice the board in my treadmill is slightly different, looking at the date stamp on the board it's from 2016 rather than 2014 ones on this thread. I have attached a pic of it and the E2 error.

I'm not sure where to start testing the board. Any pointers would be greatly appreciated.

Thanks

[balmesz001]

Re: Reebok GT40s Treadmill power supply issue?

Hi All,

We had the very same symptoms on our treadmill. I quickly identified the power board as the source of the issue, so I decided to order a new one (it's £65 from Reebok). Fortunately the wife was smarter and googled the problem and she found this topic. I measured both SS310 diodes on the PCB and there was a short on DD3, so I ordered 10 spare diodes, replaced the faulty one and the treadmill is working again.
Thank you notallbad, you saved me time and money.

And shame on me, I'm an electrical engineer and was lazy to check the components as I was expecting a more complex problem.

BTW, before the treadmill stopped to work I heard a buzzing noise from the power supply for weeks.

[aneng]

Re: Reebok GT40s Treadmill power supply issue?

I gave up all pretentions of being able to fix it myself and sent my board to a chap in Rhyl; https://www.treadmilldoctor.co.uk

It cost me £69 Inc postage and he sends you a bottle of belt oil free with your repaired board. Apparently, 75% of the time it's the 24pin chip. It contains the program code for the treadmill so save your time trying to locate a replacement - even if you found the right microcontroller, you'd never get the code.

Mine is working fine now. For anyone who has this problem, check the chip is secure in the socket, try cleaning the legs. Failing that, spend the money and get it fixed by the guy who sorted mine. Good luck!

[BenSnap]

Re: Reebok GT40s Treadmill power supply issue?

Hi, just joined the forum and came across this thread with interest. I have a Reebok treadmill with the exact same symptoms. Here's hoping the fix will be the same!!

Thanks for the pointers, will keep you updated when I get round to taking it apart.

Cheers

Dale

Did anyone manager to resolve this issue? Having the same problem also

[daled]

Re: Reebok GT40s Treadmill power supply issue?

Hi, just joined the forum and came across this thread with interest. I have a Reebok treadmill with the exact same symptoms. Here's hoping the fix will be the same!!

Thanks for the pointers, will keep you updated when I get round to taking it apart.

Cheers

Dale

[aneng]

Re: Reebok GT40s Treadmill power supply issue?

I haven't had a chance to look at it again yet, but you mention on-board testing of diodes & resistors... How does that work ? How can I test a diode, for example, without lifting one leg ? Likewise, resistors aren't going to read their actual values if they are in a circuit are they ?

[notallbad]

Re: Reebok GT40s Treadmill power supply issue?

Doubt it will be the same diode causing your fault, with the diode completely removed it still powers on albeit with the error code.

Remove the power/control board and inspect for obvious signs of damage etc... If nothing visibly wrong begin
on-board testing of the diodes, resistors etc

I can confirm results if anything looks untoward by comparing results before you start removing/replacing components.( Obviously some components give slightly differing results on-board than off, they may also differ from my results but at least be of some help).

I have put the 'temp' diode back for now as its working and partner can continue using it.

Keep us/me informed of any developments.

Also confirm that your board is the same as mine and whether the led on the power/control board is lit or not or flashing.

[aneng]

Re: Reebok GT40s Treadmill power supply issue?

Hi. I have the exact same treadmill with the exact same fault ! (Well, the symptoms are the same - instead of powering up, it pulses about twice a second, as if the PSU is cycling).

Have you got any further with yours ? I'm going to take a look at the diode you mentioned on mine.

[notallbad]

Re: Reebok GT40s Treadmill power supply issue?

Might also be worth mentioning that manufacturer specs seem to differ.
Multicomp Ifsm 100A
MIC Ifsm 80A
What the hell??? Surely if the part is an SS310 the specs should be the same regardless of manufacturer.
Or is it the way in which the specs are presented, peak forward surge current different to forward surge current perhaps?

[notallbad]

Re: Reebok GT40s Treadmill power supply issue?

Or possibly the Ifsm (Peak forward surge current) rating?

[notallbad]

Re: Reebok GT40s Treadmill power supply issue?

My partner informs me that there is a high pitched 'buzzing' coming from the power supply. Not something I heard but being somewhat older than her that probably makes sense.
I can confirm that there is an oscillating 'buzz' coming from the diode/ transformer/cap area, can't quite narrow it down exactly.

So, I put the 1N5401 back and although it is 'buzzing/humming' it is only just very audible with my ear very very close to the unit which is probably a tolerable/allowable/acceptable amount.

Now, what could be the cause? The diodes have specs near enough identical from what I can see with the exception that the 1N5401 is not a Schottky fast acting. Could it be the capacitance (Cj)?
1N5401 30pF
SK310A 250pF
SS310 190pF

Photo shows a comparison between the three for reference.

[notallbad]

Re: Reebok GT40s Treadmill power supply issue?

Just to confirm, all caps are Nicon branded with the exception of the filter cap which is UUcap branded.

Whilst it has been working with the temporary diode I have now replaced it with a Schottky SK310A. Still prefer the 9 pence fix but paid £2.64 for 5 rather than £1.64 just for one so do have spares if ever needed in the future.

Will update on the performance but it is working still!

[notallbad]

Re: Reebok GT40s Treadmill power supply issue?

here you go,
3 different sizes to choose.
http://uk.rs-online.com/web/p/rectif...iodes/9179219/
http://uk.rs-online.com/web/p/rectif...iodes/9179209/
http://uk.rs-online.com/web/p/rectif...iodes/9179164/

so what is the EXACT length & width of the original?

The SS310 is 4mm long x 2mm wide.

Thanks shall take a look at those equivalents above.

[notallbad]

Re: Reebok GT40s Treadmill power supply issue?

For this application, you would need a Schottky unit given its use at the output of a switching power supply.
What are the brands on the electrolytic capacitors on this board?

Caps are Nicon.

Fitted a 1N5401 and it seems to all be working.

Shall replace with a Schottky over the next few days before it gets used too much!

[stj]

Re: Reebok GT40s Treadmill power supply issue?

here you go,
3 different sizes to choose.
http://uk.rs-online.com/web/p/rectif...iodes/9179219/
http://uk.rs-online.com/web/p/rectif...iodes/9179209/
http://uk.rs-online.com/web/p/rectif...iodes/9179164/

so what is the EXACT length & width of the original?

[japlytic]

Re: Reebok GT40s Treadmill power supply issue?

Would a 1N5401 suffice?
Somewhat larger in physical size but there is adequate space to fit it in.

For this application, you would need a Schottky unit given its use at the output of a switching power supply.
What are the brands on the electrolytic capacitors on this board?

[notallbad]

Re: Reebok GT40s Treadmill power supply issue?

Would a 1N5401 suffice?
Somewhat larger in physical size but there is adequate space to fit it in.

[jetadm123]

Re: Reebok GT40s Treadmill power supply issue?

ss310 is a 100v 3A schottky diode made by several companies under different part numbers.

[notallbad]

Re: Reebok GT40s Treadmill power supply issue?

Powered back up with one leg of the faulty DD3 diode legs 'lifted' and it powers up fine. Lcd lit but beeping an error, understandable as ancillaries disconnected i.e incline motor and incline sensor, treadmill drive motor.

Really need to find an alternative diode!