ROLAND 204E / 184 Guard Circuit B; Trouble

Hello; I have 184 Guard Circuit B on my machine; I'm getting a Trouble error. When I open one of the protection covers, the machine gives this error and turns off the oil. I have to turn it back on using the main switch. Can you help me why this error occurs? (PC case and protection modules are intact)

 

You have a damaged sensor on one of the covers.

 

So how can I test these sensors? Because it doesn't say which sensor is faulty. And can there be stop buttons etc. instead of magnetic sensors? thanks.

 

Test with the machine off, measure the resistance of the sensor

 

Hello Daniel; I measured all the sensors on the A and B sides while the machine was off. The modules and PC are intact. When I open the mold cover, the 184 B error occurs. But when I close the mold cover, the machine goes into error again.

 

How much resistance does it measure?

 

All sensors show 22.8, only one shows 55.6. As I said, when I open the mold cover, the 184 error disappears. When I close it, the error occurs again. Is this 184 error only valid for magnetic sensors?

 

For each sensor, there are 2 contacts, have you measured both?