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Well, what I want to achieve is pretty simple (and clear, at least to me). I would like to get a working printer out of it. I understand there will be some expense and some difficulty. Besides, the desired result may not occur and I am prepared to junk the machine if I have to. In particular...

According to pictures in the service manual, access to at least part of the logic board is available fairly early in the disassembly process. It is unclear at this point what portion of the board is exposed, what the layout of the board is or whether the machine would operate at this stage. I...

Glad you have seen it. Not repairable. Of course not. But considering the numbers, 1/4 of 512 = 128 nozzles not addressed, (Do I read the specs correctly here?) this could be a fault at one input to the decoder. Possibly on one input and still on the chip or on the flexible circuit or on the...

Just out of curiosity, how many nozzles are likely to be involved in this one fault? Does anyone have an idea?

Yes, I like your characterization of it as a "regular pattern". "a printhead reaching the end of its useful life". Hmmm! This one didn't last very long. On the other hand, we don't know what has been done to it. Are you saying that the decoder chip is known to be in the printhead rather than...

By the way my intention (at least so far) is to stick with the mp610. It's built like a tank and does everything I want. I have a couple of them now and I seriously don't trust many of the newer models as I do this one. Comments?

@InkStainedFingers Thanks for your quick answer. I never thought of it that way but I guess there have to be some chips in there. Obviously, the few connection pads on the back of the printhead cannot serve individually so many thousands of nozzles. So there has to be a bunch of logic in there...

First of all, yes, I am aware this printhead has been superseded by QY6-0075. Not sure what the difference is but anyway this one was found in a used mp610 that I bought about a week ago. First date of service (from the Eeprom dump) was Aug. 2013. Total pages printed 855. So, except what you...

I see the MP600 is well liked. What about the MP610. I was under the impression that they are about the same but of course the print engine must be different since the head part numbers are different. In my area some gal about 40 miles away has a 600 for sale at $50. Someone else has a 610...

@jtoolman: Yes, it is in service mode. Be careful and follow the suggestions found elsewhere in the forum to avoid harm. @Ron350: You may be right about the count increasing with usage but this doesn't explain why I see a value of D=021.3 at total pages = 538 and a value of D=013.5 at total...

I have an ip3000 manual somewhere. When I find it I'll have a look. Also, the mp610 manual has something about absorber capacity stated as percentage in increments of 10% with a method of writing an existing value to a new EEPROM but I don't find any correlation there between a percentage and...

@OutOOtheinkwell: Well, first of all, I don't think any question is a dumb one if asked in the spirit of wanting to learn something. At least, I hope so, as otherwise I've probably asked my share of them. I'll try to answer your questions in a short form. There are others here who can do...

Ink absorber counter value. D=013.5 I have several Canon printers showing various ink absorber counter values but am unable to find anything in the manuals I have about how the values relate to the actual condition of the ink absorber. An mp610 shows a value of D=013.5 and a total page count...

I think it's just a chortle on the "unboxing" videos that have become so common. But, yeah, it is funny and they seem to be having a good time.

"The older the fiddle, the sweeter the tune" That being the case, perhaps with the aid of a tuning fork and a pencil, I could compose a "Cantata for Arthritic Canons".

@ The Hat: Thanks for your helpful comments. Addiction - for sure. Excuse to get a new one - working on that. For now though, I would be more pleased to be able to use this little guy for another 9000 pages and don't see (yet) why not. I especially appreciate the info on duplex printing and...

Yes, about my brain. I do know that switch. For some reason I was thinking about the inner front door but of course that has nothing to do with the cabinet shells. Well, it could be that switch is bad. Thanks.

@gigigogu Thanks for your comment. I'm sure I have a front door sensor to defeat but I'm not sure about top cover as I always seem to be able to operate with the top cover open. Were these switches that you can secure in place or magnetic reed switches? I don't understand the need to darken the...

Pretty sure now I have a definitive answer. Not cross-contamination. I don't wish to disparage anyone's work and do appreciate the comments as it means I'm now aware of another possibility that, after all, could occur sometime. In this case, though, I feel the evidence doesn't indicate that. For...

Looks almost like the old BJI-643 cartridges (of which I still have several).