Printer will not connect to Repetier

K8200 3D Printer K8200 - Wiring and electronics
1

Hi

As above, my issue it getting the printer to connect with Repetier.

I have downloaded the drivers for the printer using the windows executable 2.08.30 file. I downloaded Repetier V0.84.

When I plug the USB into the bored the nearby red and green LEDs come on and remain on.

When I plug the power supply in the LEDs go out, the green one mid board gives two slow flashes and the red one by the USB gives two quick flashes. Then no LEDs are on. The same thing happens for the reset button.

When removing the power, there is a short delay before the original red and green LEDs come on constant again.

I have set the Repetier printer settings up as per the instruction manual PDF and using the Com number found in Device Manager.

When I click Connect in Repetier no new messages appear in the log window about the firmware and the bottom banner reads “Connected - 5 Command Waiting (what looks like an empty loading bar) 1125 FPS”. The two numbers seem to vary between attempts.

I have tried pressing reset whilst it’s trying to connect and various combinations of unplugging, waiting and plugging cables back in. When I do click reset, the log reads “Serial com error:System.IO.Ports.SerialErrorRecievedEventsArgs”.
I tried changing the Com number in the Device Manager and to match in Repetier, in case that helped (it didn’t).
I have uninstalled and reinstalled Repetier between attempts to connect.

(For additional information, I am using 64Bit Windows 7 and a short ~2’ USB cable.)

Any information on what to try next would be greatly appreciated. I searched through various posts but to no avail so figured it was time to post.

Thanks - Molan

2

Do you have the means to test on a different PC?

3

I originally tried it on a PC with Windows XP where I got the same results and Repetier crashed each time.

I can try it on another Windows 7 PC if needs be though.

4

It turns out when adjusting the printer settings to match those in the manual I didn’t press the Apply button so never actually changed them. (I’ll see myself out)
The printer then responded to the computer and connected properly.

The next issue was the bed temperature reading as 763 degrees and the printer displaying an error with the M999 code.
This was found to be the result of the wires for the bed thermistor and the Y axis limit switch being the wrong way round.
If anyone else has this problem, I found it by connecting the printer and then pressing the Y axis limit switch on and off. Each time I did, the bed temperature would switch from 763 degrees to being idle.

Fingerscrossed I’m out of the woods now.

5

Well done in finding the cause. It would have been very difficult for us to get to the same conclusion.