I have a Chinese 1390 with a Ruida controller, and using LightBurn and a Dell Laptop. The machine is about three years old. Now, during the middle of a cut, or even when it’s idle, the controller goes into reset. I hear a “bump” sound, and it sends the laser to upper right corner, and then to home position. If left alone at idle, it continues to reset.
Most likely you have a loose power wire to the controller itself, or a loose wire somewhere in the machine that is shorting, causing a power drop that is browning out the controller.
Thank you! I’ll take a look at all the connections. Do any of the controller wires run through the chain loom that moves on the X or Y axis?
The only controller wires are the limit switch. Assuming, no ‘auto focus’. Usually one is mounted on a moving part (goes through the drag chain) and the other on the frame. Could be both…
You were exactly right! Followed the pwr wire down to the board and found the green plug wasn’t snapped in tight. Works great now. Surprised it worked this long. Thank you so much for your help!
Happy to help, and glad it was that easy. 
Thanks for responding! I’m still having intermitant problems. Every now and then the laser will stop during a cut, and the controller screen will start flashing, and then it will reset to home. I don’t have auto focus. What controller wire runs through the chain?
I don’t have a ‘chain’ on the X axes, only the Y axes. You don’t have ‘autofocus’ so there’s nothing else needed. If you have an LED you use for framing, that would have power. There is also a light bar under the X carriage. Mine runs off mains voltage 
some are 5v, be aware if you go there.
Unlikely that any of these are ‘shorting’ to ground intermittently.
I’ve never had the controller screen flash, so that may be a symptom of something I haven’t experienced.
Considering your previous encounter with the actual connections being flaky, I’d go over the whole controller and make sure that none of the these are intermittent. Not any of the in/outputs can cause a reset cycle. That’s usually indicative of a power issue.
Also might want to check that many of these machines are really not grounded properly. Lots of articles point out the mains ground is connected to something that may or may not be attached to the chassis. Mine was actually grounded properly.
Keep in mind that although the machine looks like it’s laying there, from a wires viewpoint it’s bouncing all over the place during operation.
Good luck
There isn’t a controller wire that runs through the drag chain, but the red-dot pointer usually does, and if those wires crack or short, it can cause the power supplied to the controller itself to drop out.
I don’t know of anything on the Ruida such as reset ‘pin’ on the Ruida, just the machine console ‘reset’ or a power interruption…
@LightBurn Is there any kind of software reboot option that Lightburn can send the Ruida? Just curious.
There is a command to reset the controller - Pressing ‘Home’ in RDWorks does it. I can’t recall if I send the home command or just jog back to 0,0.
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Right now it’s not an intermittent problem. The laser head is currently in the middle of the table. When I power up, it just stays where it is and makes a thumping sound with the screen flashing, and it won’t clear.
I’ve wiggled every wire, and pulled every connector off, tightened the connections, and reseated the connectors. All seems good, and I have a ground wire attached to the machine that runs outside the shop to a ground rod.
I don’t Think it’s a loose connection, because it has done this between projects while homed and not moving at all. I’m leaning towards a faulty RDC6442S-B controller, because I noticed that I loose my slow flashing lite on pin #14 (grd), and pin#12 (PUL/CW) on the AXIS U starts flashing rapidly. I even added an extra ground wire to pin#14 in case I was loosing grd from another component. Doesn’t help.
unless someone else has any other ideas, I think I’ll just order another controller. If it doesn’t fix it I’ll just have an expensive spare part.
thanks for all the help!
I don’t use RD Works. I use LightBurn.
Ok, I replaced the RDC6442S-B controller Board and LCD display. It stopped the screen from flashing and hammering, but it goes and parks in the wrong corner. I assume I need to reload the LightBurn Software, that it has deverted back to RD Works?
It is recommended to restore the factory Settings of 6224 and try the password HF8888
Thank You. I’ll give it a try tomorrow.
When I went out to try and restore factory settings, the screen start flashing continuosly. The controller leds 15, 12 and 1 are flashing. Any way to stop the screen from flashing so I can do the restore?
Is there a video? I’m starting to suspect that there’s something wrong with your screen or that the cable from your screen to the board isn’t good enough
Fixed it. Went to vendor settings and restored all the parameters.
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