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When you did the ribbon swap, you did it as pairs, not just the left ribbons, correct?

Your Oct 23 post seems to confirm you got a bad head. The old head prints, even though it's missing lots of nozzles, but the new one doesn't print...

Time to go back to Roland OEM ink...

When you did the head alignments in service mode, did you do all of them or just the bi-directional? You should do all of them and then the bi-directional in the user mode, as well...

Where you able to get into service mode and do the alignments? Did it fix your issue?

This is why it's great when people post that the suggested solution works! And people search before asking a question. Homework and feedback, awesome!

This is so true!

This should fix your problem. Do the detail version, not the simple version, better results. The fact your results are what you want in Uni-directional confirms it's a bi-directional issue.

Any update?

Please keep us posted on how it goes with the vendor. If they are from Indonesia or Maylasia, good luck!

Good to know! Added to my collection of files...

Please confirm, you swapped the ribbons only at the printhead side and left them in their original position on the carriage board. That is crucial for this to be a valid test! Otherwise, you are only confirming the ribbons are good. See the attached illustration. It's for a 4 head setup, so only...

First question is where did you get the "new compatible print head".? As this printer only has 1 fuse for both heads, I would recheck all the ribbon connections. I presume the black/cyan head is the one you replaced. You can do a ribbon swap to check the head itself. With the printer off and...

Then I stand corrected. It's been a while since I punched the buttons on an SP-540V. So, instead, go to Menu - System and print it. The current IP address should be in this file. The Intercon Nettool should allow you to set the IP address in the printer.

Try here! https://www.solventinkjet.com/product-page/roland-encoder-sensor-xc-xj-series Keep the business here in the USA when possible! Great people and they are techs, as well!

Soak the heads!

Epson printers are excellent, just hope it doesn't go down, as their tech support is absolutely the pits.

I would also try a new encoder sensor. Don't be to bummed about the scan motor, because if you use the printer a lot and keep it a long time, the scan motor will eventually go, as it is the most used motor in the machine, and you have a spare on hand. We'll stick with you to try to figure this...

You may want to remove the dampers and check and lubricate the O rings on both the top and bottom of the dampers, then reinstall them. See the attached service bulletin. This is something I've always done as standard practice, as it just made sense, even on DX4 style dampers. Lubrication is a...

I know you said in an earlier post you cleaned the encoder strip, and I suggested removing the encoder strip from the printer and cleaning it with acetone. Did you do this? When you do, be very careful not to lose the tension spring. Before you clean it, examine the strip closely, especially...