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Hi: I recently had paper jam errors with my Imageclass D1350. I replaced the cassette pickup roller and separation pad, and that fixed the jam problem nicely. However, since I did that, the copier is now making a sort of pulsed grinding noise "Hem Hem HEm" when it starts up and whenever...

From TechDirt: https://www.techdirt.com/articles/20170914/11491238210/hp-brings-back-obnoxious-drm-that-cripples-competing-printer-cartridges.shtml HP Brings Back Obnoxious DRM That Cripples Competing Printer Cartridges Can be avoided, but you must use firmware on HP's website.

rjones4849: Sorry, I don't understand the question. Do you mean how did I come to that conclusion?

I called HP and told them that this printer had barely printed a few hundred pages before the print head died. I told them about the pending class action from Morgan and Morgan law firm (US). I reminded them about the existing Class Action settlement relating to defective WiFi radios in this and...

Wait...what would happen if I did the opposite and put my (believed defective) printhead in my friend's 8620. Could that damage her printer?

Is there anything I can try to get the 4x6" photo paper feeding via the cartridge? Do we know if it is a known problem?

stratman: Are you suggesting I run another purge, or that I just print normal content to see what happens? I thought I'd print a few photos. I'm willing to spend more on ink now that I know I will at least temporarily get some decent prints. It turns out that the guy I know who is a retired...

Man, you folks are just a fountain of knowledge. Two threads and I can't believe how much I've learned here. Thanks for the warning Stratman, I had seen it before but forgotten. The guy near here seems honest-I bought ink from him before for the OfficeJet 8500 pro I'm trying to repair and he...

stratman: Thanks again. Does this turn of events rule out the idea that the controller circuit board has gone bad, or could that still be a possibility? If I'm not mistaken, the last photo test print above seems to have a reddish cast to it, and it also looks a bit grainy. Is there an easy way...

So, I'm not clear exactly what you're saying. Is it clear that at the moment, there's no black or other colour contaminating the yellow, but it could soon happen again? Does this mean I should hold off on getting another print head? The guy I mentioned earlier who is a printer tech. offered...

Okay, I took a gamble and bought a brand new, fresh yellow cartridge. Here is a standard 4x6 photo test on some older Canon photo paper. The paper is a bit yellowed. I didn't want to use fresh paper until I was sure at least I'd have a few good prints in a row. How's this?

stratman: One of the posts mentioned something about a check/repair which require removing cover and some other stuff. I call that disassembling. You seem very literal, so maybe you don't, but I call it that. (Just sayin'). Perhaps there is something we've missed. I say this because we seemed...

stratman: Yeah, I think they look very similar to the wiper blades, yes. I guess I cleaned the wiper blades. I believe I've now tried most of the recommendations, except for replacing the mentioned ink cartridges and taking apart the printer to do work on it. I didn't buy new cartridges...

WAIT a minute. If the print head is defective, why did the yellow band on the nozzle tests come out fine, but the yellow patches in Excel come out as green? If the print head or control board are bad, all (similar) yellow should come out bad, right? Here's another purge page. Scanned at 400dpi...

Wow, and I was hoping this project would be fun. Heh. Trying to decide what to do next. I'm kind of swamped for a while, I don't know if it would be wise for me to start disassembling that thing. Thanks for all this help so far, though. You folks are just amazing.

AFAICT, the rims are just liquid. Is there any way to test the logic board through diagnostic routines, or does one have to open up the printer and replace it or ??

Okay, here's a photo of the print head openings on the print head. Can you tell anything from this?

Stratman: I don't remember your asking ink tank order. But anyways, the ink tanks are definitely installed in the correct slots. Why do they call it "order" if they mean which slot it's in? Until you all straightened me out, I thought that meant you had to install them in a certain sequence...

The cross-contamination you folks are talking about-Can it end up affecting the contents inside the cartridges, or does it only result occur at the print head and stay there/on the paper? I'm asking just because, as I reported earlier, my yellow tank contents are very dark, and almost look like...

Mikling: Did you mean print head cleaning issued as a command through the driver, or actually physically removing the printhead and washing it out?