A couple of months ago I purchased a used Roland sp540v. I had to put in a new printhead and everything has been fine. But I had an medical emergency and had to leave the machine sit for about 3 weeks. Now all I can get out of a nozzle check is the attached image. I have tried cleaning a few times but I can't seem to get the heads to clear. Any help would be appreciated.
	
		
			
		
		
	

	
		
			
		
		
	
			
			