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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.

Based on one of your pics on your double photo thread, your pinch rollers are in serious need of cleaning. Use a foam swab and alcohol. And clean all the debris from around the roller shaft. As everything moves faster when cutting and the back and forth movement of the media, dirty pinch rollers...

Before you put the new mainboard in, go into Service Mode and get the head rank for all 4 heads to enter into the new mainboard. Also go into the head adjust section and write down the horizontal and bi-direction settings. In addition, go into the crop-cut and print-cut alignment sections and...

Please post a job print showing the banding...

If there is no change in the number of missing nozzles after doing 2-3 head soaks, then I'm sorry to say, I believe the black channel is permanently clogged.

Please post your latest nozzle check.

You're making progress! Suggest posting a nozzle test at this time to see what you have. It looks like it's starving out as it prints. Try doing overnight head soaks and see if it brings it back. When you do nozzle test prints, mark them and keep them. After each cleaning cycle and nozzle test...