Thorn elliptical cross trainer E3000 - The elliptical cross trainer does not wor

Question

Hello. I have THORN e3000 elliptical cross trainer. Recently regulation has broken down. The elliptical cross trainer has its own computer in which programs can be run. I was checking the engine that pulls the magneto-brake cable and works. I checked the power and control cables from the...

E8600 · Accepted Answer

Apparently not only the diode went down. I would check the capacitors probably lost capacity. Did you check if this new diode got a break or break? If you have any trusted electronics, entrust it with repair. Some element in the line of this diode probably fell. It is not excluded that this new diode was too weak so it is in those Chinese inventions where there are no element markings. Conquer the topic or create a new one: Identification of the SMD diode maybe someone had something similar to do and suggest the right one.

E8600 · Answer

How many cables go to this motor for load regulation? It probably has a built-in encoder that has failed. It's best if you put a photo of this engine.

ekler0z · Answer

To adjust the load goes all the widest tape visible in the photo above. Of this entire tape, only 3 cables supply power and ground to the computer, and 2 cables provide a signal from the wheel rotation sensor. The controller motor is 2 cables and the rest is an encoder, probably three cables. On Monday I will have access to the device and I will send a photo

Added after 2 [hours] 19 [minutes]:

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ekler0z · Answer

I need help again, because this econder turned out to be a B5K rotary potentiometer. Any ideas?

E8600 · Answer

Check the correctness of the potentiometer's indication with a multimeter if the resistance of the plant increases / decreases linearly. Because he is the potential culprit. The whole system works on the principle of servo.

ekler0z · Answer

On the first and second contact the resistance from 0 to 5 kohm is fluid, then from 5 it jumps at 7.6 kohm and so flows to 8.3 kohm and so in a circle that is from 0 to 5 then 7.6 to 8.3

E8600 · Answer

Should I understand that the potentiometer is without lock rotates around? If so, the indications are ok. Do you normally connect the power supply directly to the engine for a short time? Maybe this is why you conclude that it is too much? Does it put too much resistance on training?

ekler0z · Answer

When I plug in the power supply, it will normally turn on the computer and after a while the tensioner wheel will rotate 360 degrees (of course without the cable because it will lock quickly with the cable because the cable tension is only about 2 cm). When the elliptical cross trainer was functional, it was heard that after connecting the power supply the tensioner started to work only when the knob on the computer was turned or a program was started. Currently, the tensioner does not respond at all to the knob or the launch of a specific program. There is also a scale on the string, which in my opinion gives the minimum and maximum deflection

E8600 · Answer

You have clarified the situation so you should look for the culprit in the knob on the control panel if it is also on the potentiometer or optocoupler. Alternatively, if not some element could get off in the power path of this control board. First check the potentiometer on the panel is the plate at the bottom of the first photo you posted. The driver catches a bug somewhere how it behaves differently than usual, hopefully not a control bone with a charge or processor. The panel displays something when the power is turned on? Reacts to buttons?

ekler0z · Answer

The computer is operating normally, displaying everything to be displayed. The knob is not on the potentiometer and also works because the computer changes when rotating the load (such steps).

E8600 · Answer

Have you checked this potentiometer? Perhaps he is responsible for preload? Maybe it is damaged or disrupted? There is no sensor with this potentiometer.

Which potentiometer did you check before because I meant the big one.

ekler0z · Answer

I checked the big one and the little one. The parameters I wrote about above are from this big one.

ekler0z · Answer

While checking the computer board, I noticed that the D8 diode is chipped. Multimeter measurements show nothing in both directions. It seems to me that all the LEDs next to D8 were the same. On the others, the multimeter measurement in the diode checking mode gives a result of 560, while in the ohm measurement mode it gives a result of about 1200 k. What diode could I solder in place of the damaged one?

E8600 · Answer

What a colleague has measured does not say much (it only says that it is a silicon diode - 0.6V voltage drop), please upload an accurate photo of this diode, someone can recognize. If it has any symbols, try to read. It can be a diac, zener diode or other invention.

Here on page 3 you have the LEDs designation based on the colors of the stripes (mask code).

ekler0z · Answer

No markings visible

E8600 · Answer

It looks like a regular switching diode LL4148 but let somebody else speak because I am not a specialist in SMD.

ekler0z · Answer

I replaced the diode with a new one and the equipment began to work as it should, i.e. I could freely control the tension wheel using a computer but after a few minutes the problem returned again. I checked the diode and it's ok.
I am slowly starting to think about firing the control computer and replacing it with a 6-pin rocker switch so that I can control the pull wheel back and forth. I would also have to reduce the voltage with some stabilizer from 9v to 5v because without it the engine works too fast

ekler0z · Answer

Another breakthrough in solving my problem. A small potentiometer in the actuator is used for precise adjustment of the cable tension and if I set it to the appropriate value then after connecting the power supply the tension wheel after 360 degrees rotation apparently sets in such a position that it starts to operate normally. Today I will fly to the store for a potentiometer (the big one) because probably like a colleague a few posts above suspected, it is damaged. There is a moment in adjusting the computer knob that the tension wheel begins to go crazy in such a way that e.g. it turns in the wrong direction and if the knob jump this point then everything is ok. I suspect that at this point the tensioner wheel normally stopped and after reading incorrect potentiometer values - the computer was stupid.

Thorn elliptical cross trainer E3000 - The elliptical cross trainer does not wor

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