Like New Nautilus Exercise Bike has Dead Panel

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

Here is a better shot showing the 3 wires coming from the adapter plug wire:



This is the adapter you see in the previous pic but a better angle to show the 3 wires. It connects to a connector that has the same 3 wires.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

So the power supply has + and - output = 2 wires but your red power connector has 3 wires so we need to find out why it has 3 wires. Need the pictures of that DC input jack to see how the 3 wires are connected to the DC input jack.

This? Or something else?

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

Best I can tell, here's how we go from 3 wires to 10:

3 wires coming from adapter harness
5 wires coming from tension motor
2 wires coming from speed sensor

All of these are bundled and carried up to the console via the white loom.

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

something like this will remove it or a two legged puller
https://www.ebay.co.uk/itm/Bicycle-C...sAAOSw8FBbFfL9
different model slightly but shows wiring you cant see
https://www.youtube.com/watch?v=3BJzrbIy2RU

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

Here's a better shot of what's going on inside the bike. The power harness hooks into the tension motor and then into the speed sensor.



There doesn't appear to be any other circuitry other than the tension motor so I believe the wire increase comes from an adapter harness in this loop. Still working to get the cover off so I can get at this harness.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

Next question is how you magically went from *3* wires to *10*??!

Ans: there's something in the bowels of the bike that you've not yet seen!

You need to make a little diagram showing the two wire power adapter on one end of the page and the 10 wire connector on the other side of the page. Then, dig through the bike until you can see where those two wires morphed into those 10!

Totally agree, which is why I went about trying to remove the side panels. However, the little hole around the crank is not large enough to take the panel off without taking the crank off. I've taken the cap off the crank and removed the bolt inside but I'm still noodling how the hell to get the crank off after that.

[budm]

Re: Like New Nautilus Exercise Bike has Dead Panel

So the power supply has + and - output = 2 wires but your red power connector has 3 wires so we need to find out why it has 3 wires. Need the pictures of that DC input jack to see how the 3 wires are connected to the DC input jack.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

With your VOM/DMM on the ~20V DC scale, you should be able to verify something akin to +9V (undoubtedly HIGHER!) is present when you insert the positive DMM lead into the inner contact and hold the negative lead against the outer sleeve.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

1) So the red power connector has 3 wires? RED/WHITE/BLACK red?

Red, White, Black with white line

2) Is that the correct power supply? Did you verify the polarity requirement of the center pin?

I ordered the adapter from amazon:

https://www.amazon.com/gp/product/B01598AE3A/

It was specified as a replacement for this specific bike. I did not verify the center pin polarity because i had/have no reference for what it should be. A service manual for this bike would be golden but I cannot locate one.

3) Where does the power supply cord go to? I do not see which connector it fits into.

Below: Pic taken of harness assembly as it comes into bike from the barrel plug in pic above. The harness connects to the resistance motor and the speed sensor, then runs into the white wrapped cable that goes up to the panel console at the handlebars.

4) Pictures #6 looks like the terminal for the Black wire with white stripe is coming off the connector.

That is correct, the black wire with white stripe (or white wire with black stripe, they are about equal in prominance) originates at the plugin harness at the bottom of the bike (from the first pic I posted in this reply)

[Curious.George]

Re: Like New Nautilus Exercise Bike has Dead Panel

I got this bike really cheap in hopes I could bring it back to life. Its a Nautilus GX 2.7 Exercise bike. Cosmetically it looks like its never been used.

<grin> It probably HASN'T! Exercise bikes tend to fall out of favor pretty quickly with their owners...

However, the panel is dead and won't even light up when power is applied.
...
The power requirements are 9 volts 2 amps:

The power adapter (bought from Amazon. The bike came without a power adapter):

Interesting way to spell "Caution"!

First thing you'll notice is that the power adapter has *two* conductors -- the outer "sleeve" and the inner contact. The illustration on the adapter shows that the sleeve is "-" and the inner contact is "+". (Get this polarity wrong -- backwards -- and you'll likely toast whatever you plug it into!)

With your VOM/DMM on the ~20V DC scale, you should be able to verify something akin to +9V (undoubtedly HIGHER!) is present when you insert the positive DMM lead into the inner contact and hold the negative lead against the outer sleeve.

If you don't see voltage (and the correct polarity), your adapter is defective (unlikely given that it is "new"). Or, you aren't making good contact with one or both DMM leads.

If you see a negative voltage, then you may have the leads swapped at the DMM (red is positive, black negative).

The power connection that the adapter plugs into at the front bottom of the bike:

First question you should be asking yourself is: two conductors from power adapter but THREE wires on wiring harness! What's the third wire doing??

(It's unclear from your photos when the third wire comes into existence -- is it "here" or after this next photo?)

The power input harness at the front bottom of the bike:

The end of the harness that attaches to the panel console at the top of the bike:

Next question is how you magically went from *3* wires to *10*??!

Ans: there's something in the bowels of the bike that you've not yet seen!

You need to make a little diagram showing the two wire power adapter on one end of the page and the 10 wire connector on the other side of the page. Then, dig through the bike until you can see where those two wires morphed into those 10!

[budm]

Re: Like New Nautilus Exercise Bike has Dead Panel

1) So the red power connector has 3 wires? RED/WHITE/BLACK red?
2) Is that the correct power supply? Did you verify the polarity requirement of the center pin?
3) Where does the power supply cord go to? I do not see which connector it fits into.
4) Pictures #6 looks like the terminal for the Black wire with white stripe is coming off the connector.

[vestaviascott]

I got this bike really cheap in hopes I could bring it back to life. Its a Nautilus GX 2.7 Exercise bike. Cosmetically it looks like its never been used. However, the panel is dead and won't even light up when power is applied. I'm new to electronics troubleshooting but I really want to learn the basics. I feel like its a skill that I really want to invest time to learn.

I've taken the panel apart to visually check it over, but to my untrained eye I see no red flags.

I've included some pics below to help illustrate what I'm working with.

The first thing I'm trying to do is determine if the panel is even getting power or not and I need some help to determine how to test that. I do have a multimeter and I know how to test for continuity on a fuse, but a wiring harness presents some different challenges I need to figure out.

Pics follow:

The bike:



The power requirements are 9 volts 2 amps:




The power adapter (bought from Amazon. The bike came without a power adapter):



The power connection that the adapter plugs into at the front bottom of the bike:



The power input harness at the front bottom of the bike:



The end of the harness that attaches to the panel console at the top of the bike:



The panel interface that the connector in the pic above plugs into:



The panel connection (the top connector is disconnected in this pic. It goes to the pulse sensor on the handlebar):



The panel console:



The open panel console:



A closer look at the console panel: