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I may be able to help you out. I have a surface mount rework station and do board repairs to a certain level. If you can send a hi-res pic of the mainboard, especially a pic in the USB connector area, I will see if I can identify the USB chip and if I can get one. Where on the east coast are...

netsol, I defer to your expertise in this area. My networking knowledge only goes so far. As far as anyone else printing, typically setting up a hot folder usually takes care of this.

Have you looked at the bottom of the cyan head? Check it for any evidence of damages, any marks of any kind. Also check for ink build-up on the head. Be sure your wipers are in good shape, as they will not clean ink build-up off the head very well if they're not clean and unworn.

Have you done anything in the print head cavity recently? Do as Solventinkjet.com suggested. If that doesn't work, you might also reseat the ribbon cables on the print heads. Be sure to power off and unplug the power cable first. It looks like some of the nozzles are going into what I call a...

And it's hot down here. Let me know if you need any on-site help, just across the state from you...

IT people don't do well in wide format printing environments, LOL... They don't seem to understand the amount of printing data is, in essence, streaming data. The direct connection should solve your issue. Where are you located in Florida?

This sounds like a data transmission issue, as you are printing over a network. Are there are lot of users on this network? If it is a busy network, you could try a faster network switch. A simpler, better and cheaper option is to install a second network card in the computer and connect it...

The front to back position of the cover switch can be adjusted by loosening the 2 screws holding it in place. Be careful not to move it too far forward, as the tab on the cover can damage the switch. This should take care of your problem...

Make sure your cap is clean and there is no ink buildup on the bottom of the head and also around the edges of the head. Look for any marks or damage to the bottom of the head. Do a nozzle test print, then a medium cleaning and another nozzle test print. Please post a pic of both nozzle tests...

Have you fixed your problem? It helps the whole community when we offer suggestions on fixing a problem and get feedback on if that worked.

Make sure your cap is clean and there is no ink buildup on the bottom of the head and also around the edges of the head. If that doesn't fix the issue, then replace the cap, preferably with an OEM cap.

Excellent how to video! But don't forget to remove the clip on the drain line when turning the printer back on.

Is your heat on? I don't know if it's the picture quality or not, but that looks suspiciously like a lack of heat during printing. A pic of the nozzle check would also be very useful.

Examine the bottom of the print head for any physical damage. Clean or replace the cap. Please turn off CAPS LOCK.

Based on your nozzle test and shot counts, it looks like you are due for 2 print heads to be replaced...

Press the panel buttons in the following sequence: Main power on, front panel power off. Press the panel buttons in the following sequence: Down, right, left, up, right, down, left, press and hold right, left, and down buttons all at once and turn on front power while holding those buttons down...

6000002178 is the correct part number for the current head board for carriage board 6702048041 for the XF-640. Do a google search and several vendors come up. What was the original issue that caused you to replace the printhead and carriage board? It is very helpful to know what led up to...

As Joe said, calibrations should certainly be part of the process to fix the issue. And as ewded suggested, check the head height. Fine text will print better on a low head height. My concern is when I zoom in, I also see some overspray around the letters. This could be head height, media...

Correct, 6000002178 does not show in the original service manual parts list for the XF-640. I have legitimate access to Roland R-Net and found the part number this way. In the exploded view for the XF-640, it shows 2 numbers for the headboard - 6702048020 (which is lined out) and 6702048021 as...

It would be helpful to see a nozzle test print and the edges of a fill test in service mode. Please post these to help in determining what is wrong. How old is the printer? Your issue could be any of the following: Needing a thorough ink system cleaning, i.e., caps, wipers, all around head area...