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04-18-2022 06:01 PM
Hello all. I've been figthing this problem for 6 months now, I have tried everything I can think of to no avail.
Designjet T 2500 with very weird issue. When the last job in the print queue finishes printing, the carriage slams against the left side stop (svs side) and then repeats the last print. No error code or message is displayed. The same thing happens on startup cycle and cleaning cycles. The problem developed gradually. First it happened once a month, then once a week, now it happens every single time. I can't find anyone having a similar issue in the forums.
This is the same problem of my previous post, where I (incorrectly) diagnosed a problem with the line sensor because the line sensor calibration failed with error. Alas, the problem is not in the line sensor. The problem is in the routine the printer runs when it finishes printing, whatever that print was.
I posted a video of the problem on the following link. https://www.youtube.com/watch?v=pCud1CcvU1M
You can see in the video: 1 print first copy (the print job is one copy of course), 2 slam!!, 3 print second (unwanted) copy, 4. the carriage now parks normally. Sometimes, the same procedure repeats more than once, and I get 2, 3, or even 4 copies, until the carriage parks.
I have replaced the following:
SVS station, with new drop sensor (was at the end of life anyway...)
Belt with tensioner
The carriage movement is not obstructed
The rail was cleaned and lubricated thorougly
Firmware IS updated
Scan axis diagnostic test reports no error
I performed the service calibrations. They all proceed ok, except the ones that consist of printing something (like the line sensor calibration), in those, i get the same symptoms: print, slam!, and abort test.
Solved! Go to Solution.
05-30-2022 08:45 AM - last edited on 05-30-2022 09:01 AM by Ric_ob
Allright, I'm gonna mark this problem as solved since the printer is still working fine. And maybe someone runs into the same problem.
Everything points to the printhead. It would seem that it was faulty somehow... although I can't say precisely in what way because it was printing just fine, go figure. It was a stroke of good luck though.... because I was already gearing up to replace one of the mainboards, and they come quite pricey. But one day, the printer lost one of the colors so I decided to change the PH first.
It wasn't easy though... because the printer was in a state in which it wouldn't complete any of the service routines. Power up routine... cleaning routine... all those failed with a carriage bang! against the left stop. I figured the printhead replacement routine would be the same. And it was. It started the replacement ... and after a couple of minutes: BANG! and the process stopped. So, I had to resort to priming the new printhead myself manually. Yes it's as crazy as it sounds, yes it's a carnage worthy of a caveman.. but it is doable. With that done, I used the "mark printhead as filled" option in the service menu (that's a useful function!)... and boom... problem solved.
04-18-2022 11:00 PM
It is almost like it is loosing track of the position on the encoder strip. Have you checked all the leds on the main boards to ensure there are no errors there?
I am a volunteer, offering my knowledge to support fellow users, I do not work for HP nor speak for HP.
04-19-2022 02:00 AM
What an interesting problem.
My guess is it's ink system related.
Its printing ok then abandons the print as if some ink error has occurred.
I'd start with the cartridges.
Remove the base plate and check if the black rubber bit is not squidgy. This is caused by air. If so get a needle and syringe and remove the air.
I'd then replace the printhead. Or you can take the head to bits and examine the intermediate cartridge for ink levels.
I don't think they should be full, but they should not be empty either. You can inject ink through the port.
Heads are a bit costly but messing about with them is tedious and results uncertain.
If none of this works I'd try another set of cartridges.
There is other stuff to try but with less expectation of success. See how you get on with this.
04-19-2022 06:29 AM
Thanks all. Will try all 3 suggestions today an dreport back. Please note that in the video I was sending just a small test print. Just that little bit of a cad drawing. Its not that the printer stops mid-job. That was the whole print job I was sending.
04-19-2022 01:21 PM
Well, here i am.
Regarding the indicator leds in the electronic boards. As far as I can tell, they are all normal. Although the service manual "could" be a little more clear in this regard. After performing a fresh reboot. I get: three lit solid on the formatter board, two lit solid on the carriage pca, and my psu unit has no led, weird, it came like that from the factory. The plastic cover has the hole where the psu led should be, but there's nothing there...
Regarding the cartridges, I checked the rubber "button/pump/bellows" or whatever is called... on all six colors. They all feel fine to me, nice and solid. I tried inserting a syringe needle in the outlet port and when I press the rubber thing, a geyser of ink flies all over the place... it looks like that they are putting out pressure just fine. Regardless, this issue began years ago, albeit very sporadically... it grew worse over time....and along that period, a lot of ink cartridges and printheads passed through the printer. I didn't notice any correlation between cartridge change or printhead change and this issue getting better or worse.
Regarding the trailing cable connections. When trying to diagnose this issue, I ordered a new carriage pca and replaced it. In so doing, the trailing cable connection was reseated, at least at the carriage end. The other end, where it plugs into the engine pca, I haven't checked, although I could if you think it's a possible solution.
I do think this is somehow drop detector related. Here's why. In the video, you can see that, after printing, the carriage moves to the left (and slams)... but when it parks succesfully, it moves to the RIGHT a little bit, and carries out some sort of procedure.. and then parks. I think that's the drop detector doing a quick drop check. Although I dont see how it could be a drop detector failure because 1. it is brand new and 2. the dro detector calibration completes succesfully, with all the values in range.
04-29-2022 03:31 PM
Since my last post I have discovered that if I disable the queue, I can stop the printer from repeating the last print, so i can avoid the nuisance of wasting ink and media. The problem, however, remains. After printing instead of parking the carriage it slams it to the left, and the printer goes into a "vegetable state" for a few seconds. There is some after-print routine that is going haywire.
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