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Fish eyes are usually caused by temperature. Either too hot or not hot enough. As far as the banding what does you test print (nozzle check) look like? If good switch to unidirectional and see if it goes away. If it does machine may need a service tech to re-register the bi directional.

yes

Check cable between sub board and main board. Printer unplugged from power when you do this. Dropbox - SP540 servo board.pdf

Macmedia rebuild boards.

I can sell you 44o cartridge for 69.

Do a nozzle soak for 30 minutes. 1 ink fill and then a soft clean.

Me www.digiprint-parts.com

Did you loose ink in cartridges? If yes you left the hose from the pump out of the holder and it siphoned out. It needs to be above cap base.

Replace the magenta and black dampers. You may have to replace the yellow also.

Change the dampers.

The only other issue I can think of is you are getting air in the magenta ink line. Replace O-rings. With ink valve closed pull on magenta ink line with a syringe. You should not be able to pull it with out it going back.

Change the maintenance station DG-43329 or pump hoses could be plugged.

The grays.

When was the last time you replaced the dampers, cap top and or pump?

Look for micro switch that arm activates. Make sure its working.

Replace damper.

Print this file using your profile. Are you using 5 or 6? Does your printer have maps turned on? Dropbox - PANTONE Coated.pdf

Are you using Raster Link?

Solution: To keep your grays neutral and consistent throughout the print run, it’s best to create gray using only a screen of black. Light gray can be accomplished using 10-30% black, medium grays can be achieved from 40-60% black and dark grays between 70-85% black. Creating gray using all...