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Dampers acts as a valve against negative pressure due to the cartridges being lower than the heads. If there is any leak in the ink line air will fill in the circuit and ink will return back to the cartridge. There is no need to change them regularly although it's recommended to change them...

If a fuse is blown you should have 2 heads missing but maybe the head board could be malfunctioning. The fuses are between the big black horizontal connector that goes to the main board and the big capacitor. Have you tried crossing the head cables ? Just to be sure the problem comes from the...

It looks like very strong static...

There is not... Any dirt in the tubes would finish it's course in the heads anyway, be it with solvent or ink. Also, do you really need to replace the ink lines ? I'd do it only if one was broken, which happens rarely.

Most important information is the test print, it'll tell you if the heads are in good condition. VPs are very reliable machines (as long as any inexperienced tech/user did not put his hands under the covers) so except the heads there are few sensitive parts (the scan motor and linear encoder to...

When you have this kind of problems it's worth having a look at the nozzle test. About the problem with your print carriage, if it disconnects during printing the bearings of the print carriage may be dusted. While you have the problem you should move the carriage manually to see if it can move...

Are the bands following the feed direction or the scan direction ?

The transistors on the head boards are paired, meaning they are specially matched after the manufacturing process so that they have the exact same properties. You can see this as when you measure the transistors they all give you the exact same values. This wont be the case with a retail...

The fill pattern isn't meant to be beautiful. It's printed with way too much ink and will most of the time look "banded" due to too much ink on the media. The real test is the test print. If it looks ok then your machine is ok. If you want a test that looks like the fill pattern to see the...

You wont find any procedure in the service note to change ink configuration as it is forbidden and undocumented by Roland. I've never performed an ink replacement on a VS but I would proceed like this : The only thing you need is to go into service mode, remove all the cartridges and perform a...

The linear encoder strip allows for precisely positioning the head carriage during printing only. For all other movements (cleaning, setup, cutting), the scan motor encoder is used for positioning the carriages. Clean it only when needed with a soft dry cloth.

Heating is controlled by relays lying on the heater control board inside the bed of the machine. You can see the board if you remove the front plate just under the dryer plate. One of the relays may be stuck, preventing the machine from controlling the temperature.

It's generally caused by static charge on the media. In this case, the higher the heads & printing speed, the more fog you get, especially on highly saturated colours. Crop marks are always printed at max speed so highly sensitive to this problem.

You can read my post here about troubleshooting head board problems : http://www.signs101.com/forums/showthread.php?t=105570 You can use the same fuses as in the PROIII Series. It's a bit larger but it fits anyway. The fuses are just left of the big black connector on this picture :

You have to stop exactly on the lock otherwise the carriage will unlock. When you hit enter on "move to cap pos" the two carriages have to be stuck together and locked. Unless you don't manage to lock the carriage you won't be able to make the limit position initialize properly. You have to move...

There is a lock on the right side of the machine. You can hear it if you move the carriage slowly from the left to the right near the capping position. You'll hear a little "click". You have to stop at this precise position otherwise you'll unlock the carriage. Just move very slowly and stop on...

You probably have a problem with the corresponding cap top. It may be misplaced (not centered in its black frame) or leaky/old and the head cannot clean properly.

The cut strip may cause an irregular pressure along the media. Although if you cut through the liner the cutting pressure may be too high.

There is a shortcut on the data cables most probably those between the main board and the carriage board. Sometimes this is caused by a ferrite ring around the cables not being properly attached. The friction of the ferrite on the cables damages the plastic coating of the data cables and...

Wow this one is a bit tricky. I'm not sure it's the same problem as in the link. In the link the whole head width is printed which means there may be a shortcut on the junction from the main board to the heads. In your case the traces doesn't seem to match the head width, does it ? I've never...