Yonex ST 8000 stringing machine badminton only

This is what a technician at Xpider Sports (Taiwanese production facility) answered:
There are several factors cause Alarm04 to happen, the most common issue is found that the sensor module (aka. LoadCell) is failed.
You may follow the instruction (see the PDF attachment) to adjust parameter and see if it helps.
Also check out this step by step demonstration for opening up the machine.

If you are not able to adjust the ZERO value down to 125 range, most likely the LoadCell unit has dead.
And a new LoadCell unit replacement will needed in order to fix this issue.
And:
A load cell is a sensor device which converts force into a measurable electrical output.
For example, it's just like a electric weight scale, when you stand on it, the sensor inside of weight scale (a LoadCell) tells you how heavy you are.
In stringing machine, it sensors how much kgs/lbs the motor pulls the tensioner, and gives you the right amount of force of pulling.
You can find a stuff like this under the tensioner, with chain on it.
Keep in mind, since the LoadCell is a electrical device, it might stops working as time goes by.
Sometimes three years, sometimes five years, no one know, some people got lucky to have a machine for ten years without problem.
In your case, as long as you can get the ZERO value down to below 200, machine should works just fine.
However, you will need to replace the load cell eventually at one point.
We do sell them with the whole assembling like this.
(Load Cell kit was $285 in 2023.)
 

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Thanks a ton for this detailed solution! In my case the zero reading was 262 and I tuned it down to 125 and the machine was ok after reset
 
This is what a technician at Xpider Sports (Taiwanese production facility) answered:
There are several factors cause Alarm04 to happen, the most common issue is found that the sensor module (aka. LoadCell) is failed.
You may follow the instruction (see the PDF attachment) to adjust parameter and see if it helps.
Also check out this step by step demonstration for opening up the machine.

If you are not able to adjust the ZERO value down to 125 range, most likely the LoadCell unit has dead.
And a new LoadCell unit replacement will needed in order to fix this issue.
And:
A load cell is a sensor device which converts force into a measurable electrical output.
For example, it's just like a electric weight scale, when you stand on it, the sensor inside of weight scale (a LoadCell) tells you how heavy you are.
In stringing machine, it sensors how much kgs/lbs the motor pulls the tensioner, and gives you the right amount of force of pulling.
You can find a stuff like this under the tensioner, with chain on it.
Keep in mind, since the LoadCell is a electrical device, it might stops working as time goes by.
Sometimes three years, sometimes five years, no one know, some people got lucky to have a machine for ten years without problem.
In your case, as long as you can get the ZERO value down to below 200, machine should works just fine.
However, you will need to replace the load cell eventually at one point.
We do sell them with the whole assembling like this.
(Load Cell kit was $285 in 2023.)

Can you tell me who is selling me this load cell kit? After I have now followed the excellent instructions several times and have been able to fix the error again and again by turning the screw, it is now over. The value no longer comes below 250 and is thus far from the desired 125.
 
Can you tell me who is selling me this load cell kit? After I have now followed the excellent instructions several times and have been able to fix the error again and again by turning the screw, it is now over. The value no longer comes below 250 and is thus far from the desired 125.
Hi. I have the same error on my st-8000 except my zero value is at 4030 so no where near where it should be at 125. If i try and adjust the blue screw it doesnt change. An6 advice? Do you have details where to buy new load cell?
 
Now I have removed the sensor and can specify it more. It is the Load cell sensor of the company Transcell with the designation BAB-75m. Now I just have to find a supplier online. Alibaba seems to be able to deliver it.
 
Now I have removed the sensor and can specify it more. It is the Load cell sensor of the company Transcell with the designation BAB-75m. Now I just have to find a supplier online. Alibaba seems to be able to deliver it.
I've removed my load cell also. Have tested it and found it to be faulty. Struggling to find an exact replacement. Ive been informed that the exact 75m model is obsolete and only a 50kg and 100kg available. Thinking of buying the 100kg and recalibrating which hopefully possible on the machine. If you have a link to where you found the 75m that would be great. Thanks
 
I also received the note on the successor model. Nevertheless, I was able to order the sensor BAB-75m today at Alibaba.com (Shop: Hefei Taojiang Electromechanical Equipment Co., Ltd.) and paid 138 USD. In 4 weeks I will know if the correct sensor was sent to me.
 
I also received the note on the successor model. Nevertheless, I was able to order the sensor BAB-75m today at Alibaba.com (Shop: Hefei Taojiang Electromechanical Equipment Co., Ltd.) and paid 138 USD. In 4 weeks I will know if the correct sensor was sent to me.
Ive just ordered 75M from same place but told that its no longer in production and so cant supply. Ive selected 50MT version instead which im hoping will work once calibration adjusted.
 
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