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.
 
The sensor was now delivered, but also the one with 50kg, because the 75kg version was no longer available. Built-in, however, the sensor now shows the value 0000, which is why the machine does not work. Can anyone tell me how to calibrate it correctly?
 
The sensor was now delivered, but also the one with 50kg, because the 75kg version was no longer available. Built-in, however, the sensor now shows the value 0000, which is why the machine does not work. Can anyone tell me how to calibrate it correctly?
Snap!....received mine yesterday however not had chance to do anything with it yet.

Has the old error on the system cleared with the new sensor?
 
Snap!....received mine yesterday however not had chance to do anything with it yet.

Has the old error on the system cleared with the new sensor?
The sensor is installed and performs its job flawlessly. What is still missing is the correct calibration. Currently, the displayed value does not match the actual tensile force. I would need a guide for that. Do you have one?
 
The sensor is installed and performs its job flawlessly. What is still missing is the correct calibration. Currently, the displayed value does not match the actual tensile force. I would need a guide for that. Do you have one?
I dont unfortunately but googling to try and find something. Will of course forward on if i find anything.

Do you have an independent gauge to measure the actual tension then? How much difference is there between actual and display values?

From what ive read about other machines there would be one variable resistor on the circuit board for zero value adjustment ( this is the adjustable blue one we have) but also another one to adjust the span to match actual tension with display. Ive not seen one on the board so maybe its done another way. I suspect a calibration mode where we can dial in the tension to match actual value. ....will keep googling. Let me know if you have any luck.
 
I dont unfortunately but googling to try and find something. Will of course forward on if i find anything.

Do you have an independent gauge to measure the actual tension then? How much difference is there between actual and display values?

From what ive read about other machines there would be one variable resistor on the circuit board for zero value adjustment ( this is the adjustable blue one we have) but also another one to adjust the span to match actual tension with display. Ive not seen one on the board so maybe its done another way. I suspect a calibration mode where we can dial in the tension to match actual value. ....will keep googling. Let me know if you have any luck.
I use a digital pull scale to check the correct pulling force of the machine in between. In the software, there must be a calibration mode to match the values. Currently, I have to set the display to 15kg to actually get 11.5kg of traction.
 
Got the manual. Have attached section on calibration. Let me know how you get on.
 

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Hi guys, i also have the AT 8000, and after the machine fell on the ground (don't ask how ;-) ) i can't get it to 125 enymore, the maximum i can turn it is 31. I get the normal screen when i switch the machine on. You think i can just use it or can't i rely on the actual kilo's on the screen? Thankd for the advise guys.
 
Hi guys, i also have the AT 8000, and after the machine fell on the ground (don't ask how ;-) ) i can't get it to 125 enymore, the maximum i can turn it is 31. I get the normal screen when i switch the machine on. You think i can just use it or can't i rely on the actual kilo's on the screen? Thankd for the advise guys.
From my point of view, you should regularly use a digital scale to control the stringing hardness to make sure that the rackets keep what they promise at the end. I use the "Tennishead 2090" and I am very satisfied with it.
 
From my point of view, you should regularly use a digital scale to control the stringing hardness to make sure that the rackets keep what they promise at the end. I use the "Tennishead 2090" and I am very satisfied with it.
 
Got the manual. Have attached section on calibration. Let me know how you get on.
I am extremely grateful to you for the calibration instruction manual. Without this pad I would have had no chance to make the machine fully operational again. Trying was not an option. Now it runs perfectly again after the sensor change.
 
From my point of view, you should regularly use a digital scale to control the stringing hardness to make sure that the rackets keep what they promise at the end. I use the "Tennishead 2090" and I am very satisfied with it.
I have the same and very pleased with it.
 
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