Vellemann K8200 no reaction

[Dirk1]

hi Guys…
I have a Vellemann K8200 printer … Unfortunately I have not yet managed to move it in any way. Also no status LED lights up … I think that at least one power LED should light up on the board … I measure on the board a voltage of 15 volts … That should be OK … I also made a software update that worked wonderfully. But if I run the software from the Vellemann homepage “Repetier Host V095F” and go to “Manual control”, should I be able to let the individual motors and fans turn? That doesn’t work … But if I click on e.g. Z axis high 3x then it has these commands in the memory and if I click on OK, one command after the other is sent to the board … A LED flashes briefly on the board and the command that was sent appears in the status line … When all commands have been sent, the status line shows “OK”. I have also tried to remove all the connectors and driver components from the board except for the power supply and the fan … even this one cannot be switched on … I hope the board is not defective …
Can you please give me a tip what I can still test?
thanks

[PPAC]

Hello @Dirk1

Have you read : http://www.k8200.eu/manual/printing/?c=002

If yes … Step by step …

When connecting the power supply to the mains, there should be a brief flashing of a led next to the main microcontroller. Do you have this ?

When connecting the USB cable without mains power connected, the RX and TX LEDs light up constantly. Do you have this ?

When connecting the USB cable with mains power plugged in, the RX and TX LEDs light up / flashes briefly. Do you have this ?

Under Repetier Host during connection do you see in the log a line with the name and version of the firmware? (don’t mind the K8600 … custom firmware …)

Do you have this ?

Check the Printer Setting under Repetier Host something like that :

Do you have this ?

When you say “software update” do you mean of Repetier Host or of the firmware on the K8200 ? or something else …

[VEL450]

Hi @Dirk1, Check also these steps:

@VEL450

I have done a test under Windows with original custom software for K8200 Repetier host version: V095F.

Normally you have good communication as follow:

• Jumper “JPROG” must not be connected (pins are open).
  It’s only for firmware upgrade. In this case then the jumper must be placed.
• Connect to a USB2.0 port.
• Use a USB2.0 micro USB cable, minimum wire section AWG28 .
• Do not connect 3D-printer via USB onto USB hub. Connect main board directly on USB port computer.
• Make sure USB cable lenght is no less than 1m.

If you only connect the mainboard to USB, without the power supply connected, both red and green LEDs (LED5 & 6) will light up continuously . At device manager “in windows”, you’ll get a com port assigned to “COM & LPT” => COMx eg. COM9.

This com-port must match the printer settings in Repetier host software.

However, if the power supply is not connected , You only have communication with the PC and mainboard. No connection with the hardware (Stepper motors, Fans, Power output for extruder and heated bed).

To achieve full communication also with hardware , both USB and power must be connected to the mainboard! Normally the red and green LEDs (LED5 & 6) goes off. The green LED (LED1) briefly flashes few times. After few blinks of LED1, all LEDs goes off (LED1, 5 &6).

Only when starting the Repetier host software and click on “CONNECT” button , the green and red led ( LED5 & 6 ) flashes every +/- 2 seconds. This if the com-port is correctly configured by printer settings in Repetier host, according to device manager.

Below is a screenshot of the correct printer settings at Repetier host. Only the com-port number can be different (depend on how many USB devices are connected on Your computer). The rest, set it up like the according red boxes.

If it doesn’t work as described above, there may be an error with the mainboard.
In this case you can return it to the store where you bought it for a repair request (RMA).

Hope to have informed You sufficiently

Best Regards,
Velleman Support