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Author Topic: Another 4900 horror story  (Read 13129 times)
JeffW
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« Reply #220 on: March 28, 2014, 05:09:43 PM »
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It is interesting, that after a little research, I found that what I was pointing to is not the actual decompression pump itself. When I turned that knob I go no change in values in the service program. The decompression pump is actually just below that knob. I turned the decompression pump and did manage to get two seperate values in the service program. But does that tell me whether the pump is working or not, or that the pump is simply turning?

Is the decompression pump the one that they are having issues with? Not sure what this pump even does? Or how to check if it is working. Wow.
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Roger_Breton
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« Reply #221 on: March 28, 2014, 05:24:18 PM »
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I'll bet your pump still works. When you do a cleaning, do you see any ink flow out to the Maintenance Tank through one of the little clear plastic tubes located next to the pump?
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JeffW
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« Reply #222 on: March 28, 2014, 08:36:28 PM »
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I tried a pair cleaning on Cyan / VM, both regular and powerful. These are the only two colors to show up so far. I did not see anything come thru the tube to the waste tank.

I wonder if I could use a syringe to create some vacuum when the head is against the capping / cleaning station?
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Roger_Breton
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« Reply #223 on: March 29, 2014, 10:36:29 AM »
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First, do you see anything come through when you a cleaning on the other heads?
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JeffW
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« Reply #224 on: March 29, 2014, 05:37:48 PM »
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Tried a clean all channels from the printer, not a single drop went through. Tried a nozzle check, no improvement.
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Roger_Breton
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« Reply #225 on: March 30, 2014, 08:59:46 AM »
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Well, I had the impression, at the beginning, that not a single drop was going through my 4900's wate tubing. I can't tell you what it is. For me, the "magic ingredient" was, perhaps, the many removal and reinstalling of the head? Perhaps, if you remove the head once more, make sure you can inject piezo flush through each channel inport, and that you get a nice ribbon flowing on the other side. Then, I'll know you are at the same stage I was with my 4900 when none of my nozzles were showing on the test pattern. Look again closely at the tubing to see that they're actually full. Then, try an Ink Eject followed by an Ink charge. You're likely to get some errors in the process but it ought to get ink moving through the lines, if "all" is well. You can follow it up with a powerful clean. If the pump is "temporarily" out to lunch, none of this will make a difference on the nozzle check. But it will force some agitation through. My theory. Then, let the printer sit idle for a day or two. That other ingredient in the "secret of my sucess" was time, let whatever "gravity" and "physics" play its role. I wish you could simply swipe in a new pump to see whether you get any ink going through the waste line? Remember, I wasn't able to establish this, with my printer.
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