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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?

Okay, so...just to be clear, it would not be worth buying another yellow cartridge to try?

Mikling: I printed another "yellow" purge page and got results similar to the last print I posted-green eventually moving towards lighter green/yellow-ish with dark horizontal lines. What causes the dark horizontal lines? Hat: But the black cartridge is brand new. Just bought it two weeks ago.

So, what do my latest test prints suggest? Are the black lines indicative of anything particular? Can I resolve the problem somehow?

Mikling: When you said "This is one mode of older printhead failure", does that type of failure come from usage/wear alone? Or can it come from age. Cause we seem to believe this printer has seen very little use. TPAGE=160 or so when I got it, assuming the numbers can be believed.

Okay, I did a purge page with yellow and magenta. I didn't know how to do PM, so I just made the Magenta really light. Is that alright? Scanned at 400 dpi. The other colour/banding/whatever in the yellow is obvious. I noticed it gets lighter near the bottom (towards the end of printing?). Does...

Peter: EDIT: Dang! Now this stupid thing will not feed 4x6" photo paper from the cassette. It keeps complaining there is no paper in the tray. I have about 20 sheets of Canon glossy photo paper in there. Suggestions? I've set it to 4x6" photo paper in the driver, and tried both "cassette"a and...

Of which? Nozzle? Spreadsheet? I'm using up a fair bit of ink here. Yellow is now @ about 45% full.