HP R2000 Plus Printhead overheating

[Think713]

So we've been having an issue with our R2000 Plus overheating the printhead module in slot 4 (this is where our cyan and black is situated).

We've replaced wipers and checked the water purge/dispense to make sure that is working properly. We even called HP for a tech call and they werent even able to help us. We were told unless the problem persists and continues to point of error then they cant actually diagnose the problem.
For the prints this results in heavy banding and fuzzy edges for prints. It starts normal and after about 5-6 sheets of coro it begins to band and by sheet 10-12 the prints are completely useless.


So initially what happened is we were getting reseat errors for slot 4. This eventually turned into a replacement error. That replacement error pops up on total degradation of print, and upon inspecting the print head there is ink completely drying on the underside which should basically never happen with the continual wiping of the head on both sides of the printer.
Replacing the printhead has not fixed this problem, neither has swapping wearable parts that are changed consistently in maintenance cycles.


Have any of you experienced this? and any idea?

 

[Think713]

These are photos showing the ink buildup. And showing the purge dispense patterns.

 

[balstestrat]

Have you calibrated the blades? I mean... people don't always calibrate they just hit "DONE" on the maintenance and it can cause problems.

Is the aerosol system cleaned properly? Down bottom is the slit for it to suck the aerosol and it gets blocked if not cleaned.

Have you replaced the cap for the printhead? Maybe it could be damaged.

I would try to follow the cleaning process while printing to see if any issues arise. Slow-mo film the motion to see it cleans properly. Maybe the blade lift system could have some problem or printhead is not seated correctly, slot is not screwed in all the way I mean anything is possible.
Maybe also try to swap the PCA with another just to cancel that out.

Also how hot is your printzone heat? Maybe you are running 4-pass ex. and it's too hot?

 

[Think713]

Have you calibrated the blades? I mean... people don't always calibrate they just hit "DONE" on the maintenance and it can cause problems.

Is the aerosol system cleaned properly? Down bottom is the slit for it to suck the aerosol and it gets blocked if not cleaned.

Have you replaced the cap for the printhead? Maybe it could be damaged.

I would try to follow the cleaning process while printing to see if any issues arise. Slow-mo film the motion to see it cleans properly. Maybe the blade lift system could have some problem or printhead is not seated correctly, slot is not screwed in all the way I mean anything is possible.
Maybe also try to swap the PCA with another just to cancel that out.

Also how hot is your printzone heat? Maybe you are running 4-pass ex. and it's too hot?

These coros are getting an 8 pass...
The station caps we did do a swap on...The blade calibration could be done. I did just throw it in. The orange blade replacement is not something that really pops up with the maintanance cleaning that ive seen.. So i've not even been prompted to change it. We changed it because we saw it needed to be. The aersol filters get cleaned and changed with new ones every cycle... Those are fine as far as I can tell...
This is only with printhead unit 4... the rest of em them don't present this problem.
I'm kinda stumped. As far as printzone heat... I dont have an exact figure on that, but the temp gauge on the monitor shows less than half way. So we're assuming its fine. Im imagining this is an electronics issues.

 

[balstestrat]

I have to ask why do you print coro on 8p? I mean it's coro after all.

Printzone heat (drying) you have to check in the printmode settings.

The only electronics affecting just one head is the PCA next to it and like I said you can swap it with the one next to it if you wish to try.

 

[Think713]

I have to ask why do you print coro on 8p? I mean it's coro after all.

Printzone heat (drying) you have to check in the printmode settings.

The only electronics affecting just one head is the PCA next to it and like I said you can swap it with the one next to it if you wish to try.

The quality of the prints are noticeably worse on 6 or less... sometimes i run 6, but 8 is standard... One full sheet prints in a few minutes so its not too bad on time...

 

[cornholio]

To me, it looks like the printhead is not down all the way on one side, since it seems to affect one side (front or back) more, than the other, judging your pics.

 

[ToTo]

Have you checked amount of ink in the intermediate tank? Easiest is to go to ph replacement to deactivate pressure. The take of IT and check if there is sufficient ink in. Can happen that its running empty causing dryfiring and overheating

 

[Think713]

Have you checked amount of ink in the intermediate tank? Easiest is to go to ph replacement to deactivate pressure. The take of IT and check if there is sufficient ink in. Can happen that its running empty causing dryfiring and overheating

Its funny you mention that because the printer doesnt ever seem to give us the prompt to change the intermediate tanks for the rest of the heads, just the white... In the year ive been here we've changed the white twice, and none of the others...

 

[Think713]

To me, it looks like the printhead is not down all the way on one side, since it seems to affect one side (front or back) more, than the other, judging your pics.

IF that were true (and idk if it is or not) I would think that has something to do with the thing it sits down into cause It seems to place in there just fine. I wouldn't know how to adjust that even if it were the case. But I can take a look today by moving the carriage and taking a look at the underside. So maybe.
I have a feeling though that was maybe do to the wiper just not hitting all the nozzles evenly prior to use changing it.

 

[balstestrat]

Its funny you mention that because the printer doesnt ever seem to give us the prompt to change the intermediate tanks for the rest of the heads, just the white... In the year ive been here we've changed the white twice, and none of the others...

The replacement interval for white IT is 4 months. Rest of them will take forever and it's not time based. I think it's 1000 cycles that the IT is rated for so 1000 litres of ink each (I could be wrong but still you get the idea).
You will see all the status at the bottom of maintenances (hit the upcoming or whatever it's called, it's all there every maintenance and you can see the counter).