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The main thing is you have found the problem. And now you have some experience at changing printheads!

You seriously need to reconsider. If you haven't bought it yet, then don't. The printer does NOT have 2 heads, it has 3. It originally was designed as a CMYKx2 printer with 4 printheads. It look like it was converted to 6 color mode, i.e., CMYKLcLm and the third head has black? ink in it or...

It seems like you may have a bad print head. First - do a nozzle test print to show the current head condition, which I will need you to post. You can determine this by doing the following. You are going to do a ribbon swap, but it must be done exactly as follows. Please refer to the attached...

Jim Hill, Check your conversations...

If you are unsuccessful with Roland, send me your email address and I will send you ColorRip 2.2 and the service manual.

You're welcome on the media feed tip! Absolutely you should input the head rank! Will it hurt the head if you don't? Maybe, maybe not, depends upon who you ask. But!!! If it wasn't important, why would the manufacturer go to the trouble of putting it on the head? I do know some of the code has...

If you are at all mechanically inclined, I am very good at phone tech support. I have a customer in the Bahamas, a young lady who I have walked through various issues, including print head changes, capping issues, encoder issues, removing and replacing circuit boards, etc. I can help you...

Your tech needs to go through the printer and check all the ink line connections and tighten them. Also check any O rings. A tip from Roland on installing new dampers is to moisten the O rings with a bit of cleaning solution before installing them. This keeps the O ring from being deformed...

I prefer to try to determine which part may be bad before replacing everything at once, which can get expensive. Plus, if you change a bunch of stuff at once, you don't know what fixed it. Number one rule in troubleshooting, do 1 thing at a time, then test. Since this looks like your magenta is...

We spoke some time ago about your issue and you were going to get back to me when you had a meter so I could help you. However, I never heard back from you. The offer to help still stands... https://signs101.com/threads/my-magenta-and-yellow-are-not-printing.159724/

You are are being mislead. That printer has 4 DX4 heads, one for each color. It is in CMYKx2 mode and all 4 heads appear to be damaged. So you are looking at several thousand dollars just for the heads, not counting whatever else may be wrong with it, plus labor. Go for a newer machine.

That one baffled me for a bit.

Post the nozzle check please...

Make sure to pull through the dampers to fill the ink lines, NOT through the caps as you can possibly damage the heads. Once the dampers have ink in them, as Jordan suggested, do a power clean. If you are not getting ink at that time, try pulling through the caps, BUT very gently. If you are...

Try adjusting the media feed. Depending upon the printing pattern you are using, the Mutoh printers will give you vertical banding if the media feed is off, especially in the wave pattern.

Please post a clear closeup pic, especially if you can print some small text.

Reprint the file in Uni-Direction. If it looks better, you need to do the bidirectional adjustment. See attached. Use the detailed mode.

Is this fuse located very close to the big black heatsinks? If so, it is the fuse for the output from the mainboard and will definitely be your issue. I believe it is soldered on to the board. Do you have someone who is good at soldering small parts? If not, I offer board repair services. Call...

Sounds like the needles had some dried ink in them. Glad you are up!

Isn't that the truth!