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Cut out some 45° rectangles or squares. If you see "stepping", your timing belt is jumping. It could also be a pulley, that isn't properly fixed on the axle. Standard blades from Summa(HP) have a .43mm offset. Do a offset testcut to see, if it's ok.

I was called to a customer printing sandwich on a 800W. I was told to replace the feed roller and all the roller bearings...(what a shitty job) It didn't change a thing. I finally found out, that the vinyl was deformed by the drying heat.(not the curing) By reducing the drying temperature and...

And lots of malware

I would suggest the pump. What are the pump cycles? 200000 is the lifetime Roland suggests. I have seen them failing around that time... The cyan misting is likely deflected nozzles.(the testprint shows some) Printing black areas shows the trailing mist, because when black is generated with a...

Your issue is, because the chip on the cartridge is not read correctly. (If this happens, the machine adds cleanings after a certain number of scans. If you use some bulk system, replace the chips. It's also possible, that the latest chips are not recognized anymore by your outdated firmware. I...

While you really needed to buy the whole screen unit before, this part alone can now be ordered from HP as well.

The electronics and mechanics of a TA10 and TA41 are completely different. Not even the pen and blade holders are the same.

The head board.

A better way to check the connection is with CutterControl. It's always the first thing I check. (Was it even back with Windows 3.1 and serial ports on the good old Summasigns.)

Never use Chinese dampers on DX7 heads. I had one customer, who ordered those from Digiprint. When I saw them, I told the customer that it would be crazy to risk a 2k€ head by using these dampers. I told him to throw this trash away and installed the real ones that cost some 100 Euros each...

The purging heads are used during installation or after replacement of the SRK(ink lines and cables going to the carriage) to fill the system with ink. When there is some ink in the line already, the purgers won't help. If there is air inside the lines, you can use a syringe. It is rather...

I don't know, if this option exists, but that's not important. On a 800, or 700 you have no chance to print to the front edge of the medium without it jamming in the curing channel.

There is a small round rubber patch and a small setscrew, limiting the upper position of the pen/blade. Give it a drop of oil and you should be ok.

How much did you invest? Time & Cash

I could imagine, that it's only displayed in Versaworks. The real ink empty is sensed during damper refilling. If the pump can't fill the damper (because the bag is empty), it will give a ink empty message, after it tried multiple times without success. It even gives you the chance to take out...

This was a ink issue for sure. I had multiple cases with EcoMax3 yellow behaving exactly this way. (EcoMax3 is only sold in Europe AFAIK and should be less toxic) I flushed the ink lines and replaced dampers and heads and changed to EcoMax2 ink. That did the trick...

It's a known issue with Latex ink, that has the scratch proofing overcoat included in the color inks.(generation 3 inks now)

If you "totally disassembled it", chances are very high, that the head isn't sitting correctly on the captop. (In early service guides, the captop mechanism was not meant to be removed. In later guides, a jig is mentioned for correct installation) Good luck with hot water... are you using FPG...

Clean the drive roller rubbers. Check for a too high back tension or vacuum. If it doesn't help, try with deactivated Omas. If it gets better, clean or replace the Omas.

In the case of the SG-540, it's the locking mechanism. Take it out,(be carefull not to loose the spring loaded ball...) clean it, put fresh grease and reinstall it. Then, I'd do a limit position initialize as well. That should be it.