Reebok GT40s Treadmill power supply issue?

[vikas23]

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.

Hi Notallbad,

Did you find the cause of the humming sound?

I had same issue with my treadmill. I replaced diode ss310 bought off ebay. However the treadmill works as expected, there is this humming sound coming from the board. Its quite loud to be ignored when treadmill is powered 'ON' but not running. When running, the sound get suppressed. Not sure if I should replace the diode with another one.

Any help is much appreciated.

Thanks

[Gazray2022]

Re: Reebok GT40s Treadmill power supply issue?

Hi all

Sorry for bringing this thread back to life. Does anyone know how the cover comes off to get access to the motor control board? Thanks

[peterdownunder]

Re: Reebok GT40s Treadmill power supply issue?

Am having the same problem as most here but still not working. Initially no power from the main board, and thanks to this thread discovered DD3 was shorted.

After replacing it there were various voltages on the board, so I plugged in the head unit. This caused the powered supply to cycle through chirp-shutdown-chirp, assuming due to some over current issue.

The head unit seems to take ~8 volt that I measured on the connector, and confirmed by looking at the head unit that has a lm7805. Powered it up from my bench PS and it came on successfully drawing ~.15 amps, which seems reasonable.

Jumpered the power and gnd from the main board and the head-unit powers up OK. The data path seems to be a single opto isolated pin, one each way. If I plug in the power-supply-to-head-unit line everything still powers up with an error on the head unit. As soon as I plug in the head-to-ps line the power supply goes into shutdown.

Seems to be two power rails, one 15v, and one 5v. Pulled the 7815 and it appears Ok. The 7805 is surface mount, so don't want to touch that. Don't think they will be the problem as I expect it to be something downstream drawing too much current.

Haven't done much on the high voltage side, assuming that it hasn't powered that up yet, although in circuit measurements all seem ok.

Anyone seen any other thing likely to cause this.

[Ayrtec]

Re: Reebok GT40s Treadmill power supply issue?

Hi I had the same issue with the DD3 diode replaced it .powered on the treadmill .pressed the start button and blew all the power sockets in the home.Anyone have any ideas?

[Bella30]

Re: Reebok GT40s Treadmill power supply issue?

Finally got round to calling reebok yesterday to be told I need a new console board but there out of stock at the moment and there struggling to get them in.

[Poolio88]

Re: Reebok GT40s Treadmill power supply issue?

Hi all, sorry for bringing up an old thread. I have the same beeping and flashing screen on my gt40s.

I've got the board out and on dd3 I get a reading of 0 across the diode does this mean its shorting out? On dd5 I get a reading of 325.

Also struggling to find somewhere to purchase a replacement ss310 diode.

Any help is appreciated

Jason

[Bella30]

Re: Reebok GT40s Treadmill power supply issue?

Check the spade connector circled in blue for corrosion

Seems to be okay any other ideas?

[SMDFlea]

Re: Reebok GT40s Treadmill power supply issue?

Bit late only just got round to looking at the board apart from being dusty can't see anything.

Treadmill will randomly cut out

Any ideas?

Check the spade connector circled in blue for corrosion

[Bella30]

Re: Reebok GT40s Treadmill power supply issue?

Bit late only just got round to looking at the board apart from being dusty can't see anything.

Treadmill will randomly cut out

Any ideas?

[sam_sam_sam]

Re: Reebok GT40s Treadmill power supply issue?

Hi I've a problem with my reebok gt40s treadmill it randomly keeps completely cutting out sometimes it will be fine haven't noticed a pattern with it,just abit scared to use it now as it stops dead when in use.

Going to have a look at the board later today

Please post some pictures of the front and back of each board in this device

Welcome to the forum

[Bella30]

Re: Reebok GT40s Treadmill power supply issue?

Hi I've a problem with my reebok gt40s treadmill it randomly keeps completely cutting out sometimes it will be fine haven't noticed a pattern with it,just abit scared to use it now as it stops dead when in use.

Going to have a look at the board later today

[azzetech]

Re: Reebok GT40s Treadmill power supply issue?

thank you guys for this forum, you saved my life , exactly same issue on my treadmill Reebok onegt40s,

[Crowds]

Re: Reebok GT40s Treadmill power supply issue?

just found this thread gents on Google, bought a faulty GT40S with the same symptoms and guess what DD3 was shorting! removed and the screen fired up then showed an E1 which i expected. Now to order a diode and hope to god i can remember how to solder.

Anyway i came on to say thanks Guys

Cheers Paul

[jyecee]

Re: Reebok GT40s Treadmill power supply issue?

[QUOTE=balmesz001;939970]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

Hi Balmesz

I received the diodes today, same as yourself I replaced dd3 and the treadmill powered up fine. I gave it a 20 minute test and everything was ok. I haven't been able to find a schematic for the board but I'm guessing that dd3 is the output rectifying diode. Having seen how many people have had this fault I would love to see the schematic and try and figure out what is causing this fault. But all good here at the moment so thanks for your post.

Jim

[jyecee]

Re: Reebok GT40s Treadmill power supply issue?

[QUOTE=balmesz001;939970]Hi All,
I have just found this article, I too have the same problem and I have tested DD3 which is shorted. I have ordered a pack of the diodes and I'm waiting for them, but I wanted to ask you if this has still fixed the problem for you.

Regards

Jim

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.

Hi

I have just found this article, I too have the same problem and I have tested DD3 which is shorted. I have ordered a pack of the diodes and I'm waiting for them, but I wanted to ask you if this has still fixed the problem for you.

Regards

Jim

[R_J]

Re: Reebok GT40s Treadmill power supply issue?

I would check the parts directly connected to the motor, I believe there is a diode and a transistor mounted to the heatsink, check them first.

[M.A.H]

Re: Reebok GT40s Treadmill power supply issue?

I connected the multi-meter to the negative and positive wires of the motor and ran on the treadmill. I got a voltage reading from the motor. The faster the motor turned the voltage reading increased.

It looks like the motor is good then...the board must be faulty.

Any thoughts?

[R_J]

Re: Reebok GT40s Treadmill power supply issue?

Can you turn the motor by hand? disconnect the motor from the board and measure the motor resistance (across the red & black wires) If you can spin the motor by hand, connect your meter (use DC volts) across the motor wires and and spin it, you should read a voltage. If you do the motor is likely ok.

[M.A.H]

Re: Reebok GT40s Treadmill power supply issue?

I have line voltage across AC1 & AC2 so there is power going into the board. The motor installed in this treadmill is 180V, I don't any reading from the motor terminals M- & M+. Does that mean the board is at fault?

Is there a way to test the motor?

[CapLeaker]

Re: Reebok GT40s Treadmill power supply issue?

follow the smell...