Sc-545ex ink flow problem

I have a Roland sc-545ex that I purchased with stopped up heads. I replaced all 6 heads, dampers and cap tops. I pulled ink to each of the dampers with a syringe.. (the ink retreated back into the line after removing the syringe). Installed everything back and I’m getting no ink to the cap tops. They are still clean after going through the head replace/all sequence to fill the ink.
I thought maybe it’s the air in the mines? So I attempted to pull ink from the cap top lines (with the heads parked). The first had 100% resistance... no flow of anything. The next moved freely...very freely, and no ink. I pulled the cap tops and the one that had no flow...has no flow with it uninstalled. The other, is open. Are they supposed to have free air flow through them when they are completely disconnected...or should there be no flow ? Just trying to get this beast up and running ASAP. Any help would be appreciated!

 

Should the caps be free flowing when not installed? I only pulled the 2 so far. I was waiting to see what I could find out here first.

also, how would I go about making sure the capping station and heads are properly aligned please?

 

Yes sir, I replaced the o rings as well. But I actually pulled the ink from the lines where it attaches to the dampers, so not from the damper itself. That only leaves the connection to the cartridge or the cartridges themselves. I’m using refillable bulk carts. If the fill nozzle on top of the carts isn’t air tight, would that be the problem? I would think that as long as the ink level is over there connector...it would be air tight (I’ve been wrong before lol) .
I’m also really curious about the cap tops. I don’t really understand how they function internally, but if one is open and allows air to pass freely and another doesn’t allow any aif whatsoever... it m assuming one of those is wrong. I haven’t pulled the rest of them because I’m not sure what I’m checking them for yet.
Btw...I really appreciate you guys for helping. Me and my dad have always wanted to start a small business together, and he recently retired so this is the perfect time for it. Now I just need this printer running lol. Thanks again guys!

 

Thank you very much for the info. I replaced the dampers and pulled the ink through them...the ink didn’t retreat this time.

I reinstalled the cap tops again and went ahead and tried the filling cycle. Again nothing moved. At all. No ink on the cap tops at all. And of course the lines from the cap tops to the pumps are also still clean.

I removed the first cap top line (heads parked) to attempt to slows pull ink through the head...and there is little to no resistance and zero movement from the dampers or lines.But from what I can tell...the heads seem to be on the cap tops ok. Not sure how to get a better picture of the heads/cap tops.

I will order the Roland cap tops, but it it even possible that all 6 are trash out of the package? It seems like the problem is the heads/cap top seal, but I’m not sure how to diagnose it next.

 

Very possible. But I’m not sure how to go about properly aligning them. Doesn’t the head alignment function require printing?