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Mixing brands of ink is something of a crap shoot. Even though ink manufacturers claim their ink is compatible with OEM ink, there can sometimes be minor issues that only show up in certain circumstances. Or they can be extreme. Years ago, I was working for MegaInk and we learned that, even...

Look to see how much free hard drive space you have. A lack of free space can really slow everything down. Also look at your print queues and consider either deleting files or moving them to a backup folder if you need to keep them.

Rather than bypass the choke valve, which is incredibly useful, replace the flexible tube that is pinched closed during the choke valve operation. Roland does not carry it anymore, but this should be a perfectly good replacement. It's the correct size, flexible and is solvent resistant...

Good to know your level of expertise, makes it easier to help. I can see this is a strange problem that requires out of the box thinking. You said you have dealt with choke valve issues in the past, have you verified that it's working correctly? It seems to be the only common point for all the...

You absolutely must remove the printhead from the brown head adapter plate. It is physically impossible to remove the manifold screws without doing so. You might need to remove the nut with the white RTV from the old manifold if the replacement manifold doesn't have any. The best way to remove...

Correct me if I'm wrong, but it sounds like your problems gradually started with a captop replacement about a month ago and now won't go away with a new captop. I've attached a pic with 2 things to check - that the spring on the front of the captop (critical for head to captop alignment) is...

Agreed. For a comparison of simplicity vs engineering complication, look at the DX7 ink line to damper connection of Mutoh vs Roland. I absolutely detest the Mutoh part. I'm starting to suggest my Mutoh customers switch to the Roland version during a head replacement. Mutoh - stuff needed -...

This is common with the older Roland printers using DX4 heads and the Roland EcoSol black ink. I've seen this dozens and dozens of times and a new head always fixes the issue. The carbon black pigment is rougher on the DX4 head internals than the pigments in the other colors. Replace the head...

I've attached a PDF of Roland's mainboard compatibility and DIP switch settings. According to this, the SJ-740 and SJ-740EX use different mainboards and aren't compatible. That being said, perhaps trying the dip setting might be worth a try. This thread may also be helpful -...

That's what I suspected. The SJ-740 runs under ColorRip and the SJ-740EX runs under VersaWorks. I don't know if you can change it. The two models use different mainboards, the 740 using an FJ-540 mainboard and the 740EX uses the SJ-1000 mainboard. Possibly updating the 740 with the 740EX...

I'm not sure there is a difference between the SJ-740 and the SJ-740EX. What is your reason for wanting to do this? Edited - Never mind, I found the difference, see below post...

Would you please post a pic of the silver label that shows the model number and serial number?

Check your front and rear media sensors. First, look inside both the sensor holes and make sure you can see both sensor eyes on each one. Next, blast them with some compressed air. If that doesn't work, clean them with a foam swab, just damp with alcohol. If it's still not working, go into...

Not sure where you bought your parts, but those prices are ridiculous! I'm presuming those are Canadian dollar amounts, which would mean you paid 2-3 times what you can get the parts for at Solventinkjet.com. I suggest you check them before buying any more parts... Agree, it looks like a bad head.

What you are looking for is called "Fill" in service mode. Service menu-print menu-test pattern-fill. See attached... It prints each color individually at 100% ink, 720 dpi , standard speed, bi-directional.

Before suggesting a solution, I have several questions. Where did you get the printhead? Did you install new dampers with the head? How old are the cap tops? I do initially suggest reseating the head ribbon cables, with the printer unplugged...

And don't buy anything from any vendors in Malaysia or Indonesia...

Here you go... If the caps are lined up in Step 4, you can skip steps 5-11 and go to Step 12. Be sure to move the cut carriage all the way to the left before hitting Enter in Step 14, or you will get an error.

You are on the right track, but using the wrong liquid. This is the best way to do this. You will need gloves, a clean microfiber cloth and acetone. Yes, acetone... It will not damage the encoder strip in any way. 91% alcohol is ok, but doesn't get all the ink off, while acetone will. NEVER use...

Check the ribbons going from the carriage board to the printheads. You did not mention them as a part you replaced.