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Red flags to watch for when buying printer parts: 1. Unbelievable great price. 2. Payment by wire transfer - only if you want to give away your money. 3. Vendors who sell all kinds of items besides printer parts. 4. Any vendor in the Far East/Pacific Rim - Indonesia, Maylasia, Hong Kong, etc...

To check the output transistors, power down and unplug the printer. Wait 15 minutes. Set a resistance meter to the most sensitive scale and touch the leads together to get your zero reference, as not all meters actually go to zero. Recheck F2 & F3. Then measure the outer 2 legs of each...

I don't understand why you won't tell us the vendor... Here's a source for a reputable supplier and they are an active member here. https://www.solventinkjet.com/product-page/roland-dx4-print-head-solvent

First thing you need to do is move the head to the maintenance area on the left side of the printer and examine the bottom of the head. Please take a very clear picture and post it. I would not do any cleaning until you do this. Depending upon what may be on the bottom of the head, like banner...

Scroll down to: SIGN EQUIPMENT & HARDWARE • Open to All Members - Roland You just posted there at 12:48 am.

There is only one answer. The head you bought is defective. It is not repairable. I'm done.

Ando, did you figure out what was wrong?

This is a classified ad section. You need to post this question in the Roland Equipment Forum.

You have a bad head. End of story. You have proved it by swapping the old head in and printing nozzles and the new head back in again and getting nothing. If you keep trying to find a different answer by experimenting, you are going to make things worse. You have gotten excellent advice from a...

When you did the ribbon swap, you did it as pairs, not just the left ribbons, correct?

Your Oct 23 post seems to confirm you got a bad head. The old head prints, even though it's missing lots of nozzles, but the new one doesn't print...

Time to go back to Roland OEM ink...

When you did the head alignments in service mode, did you do all of them or just the bi-directional? You should do all of them and then the bi-directional in the user mode, as well...

Where you able to get into service mode and do the alignments? Did it fix your issue?

This is why it's great when people post that the suggested solution works! And people search before asking a question. Homework and feedback, awesome!

This is so true!

This should fix your problem. Do the detail version, not the simple version, better results. The fact your results are what you want in Uni-directional confirms it's a bi-directional issue.

Any update?

Please keep us posted on how it goes with the vendor. If they are from Indonesia or Maylasia, good luck!

Good to know! Added to my collection of files...