A Digital Printing Network
Just ran into an issue on this during the past week. Seems that printing red has been banding lately and a bit of black running into other colors.
I generally get called into this when there are problems with the VS, so bare with me if anything is off or sounds like something has been missed.
In the past two days there has been a lot of normal cleanings, and manual cleanings. The capping station looks good (it was just replaced in the spring). Double checked the profiles that are being used ect. all seems good.
Enclosed a pic of the latest print test. Seems to be various colors running into others. Any suggestions on where we should start to begin correcting the issue?
looks like a cap issue to me
have you checked all the print heads to see if there were any clogs or 'crap' building-up in the ink tubes connecting to the print heads? I have a SP-300i and got it serviced not long ago, had a technician come in and was left only to find that it was overdue for proper maintenance and replacing of wipers... We had issues with black + Magenta, then the other remaining two which were effected by the clean.
Looks like a captop issue to me as well. How are you maintaining the captop? What weekly maintenance are you doing on it?
Since we had an issue with the previous cap we set up a cleaning schedule, daily cleaning (basically page 72 in the VS640 manual).
Every second Monday a manual cleaning (page 76)
On Fridays a wiper and cap clean (adding solution to the cap station). Basically the same as page 76 without manually cleaning the head.
Not sure if this is sufficient or overkill.
That sounds pretty good! How about humidity level in the printer area? I have had 2 printers lately that I have had clogged drain lines due to high humidity. If the drain line is clogged, it will cause issues backup to the captop.
I checked the drain lines with a syringe, they seemed fine nothing seemed clogged, it pulled a bit of ink out freely.
Curious on the humidity level that the machine runs well under. The previous year it was in a somewhat different environment, different levels of everything.
When it was extremely hot outside it seemed to print poorly. This year in a different office it has been somewhat hit and miss with more of a controlled temperature. I am pondering the thought that may have something to do with it.
Replaced the capping station this morning. It is better but still not perfect. Running normal cleans now to see if it cleans up.
This post will seem out of place in the time line of things. I put it here in hopes of getting Admin to have a peek. I have replaced wipers, cap top, spring in the wiper mechanism that was stretched and cleaned it thoroughly. Updated firmware. Checked the hoses for clogs ect. Soaked the head with slight improvements but it only seemed to help the drop outs. Checked the spring under the cap as Butch suggested all looks normal there as well.
I get very little drop out in the test print, they all look similar to the previous ones posted. However the point of concern is the black line when it does the test prints second pass. You can see it in the attached. On some actual prints it results in very slight black banding, it is not very noticeable, these prints can be used. Now other times on the same material the black seems to come out at the start of the print and then fade off to a normal print job, basically looks like a dark black gradient over the normal print until it fades to the normal image.
So any further suggestions?
It still looks like you are getting cross contamination on the test print. The slight band may be from something rubbing on the head as it travels. We just had an instance of the wiper felt being slightly out of sequence where this happened on another customer.
With the printer off, move the print head to the left until it clicks and then move it to the right and see if there is anything touching it.
The cross contamination is still an issue with it not drawing a proper vacuum on the head when it is capped. It is either the wrong spring assembly under the captop or something is misaligned. Do you have avialiblity to get a tech out there?
I believe you can just do that once a month or more if necessary unless you're printing everyday on your VS640... Just run test prints like you said every week to prevent clogs in your print heads and tubes.
could be the cap spring weakening - happened on my SP300V - check the drains like admin said too
Attached the latest test print. I double checked the drains, all still seems good. More cleanings ect. The test print now has less drop off my only real concern is the black line into the yellow, and the light cyan into the silver on the test prints.
I am going to check on the cap spring as well as Butch suggested. A dehumidifier was added to the room as well to help regulate the climate of the room. From the test print, does this point in any one direction?
We had the same issue with our Vs 640 , all I did was switch everything off ,ie. power on printer and mains both off restarted problem fixed.