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I don't think I can agree with you here. I don't want to dismiss your view either as you are largely right. But what I have been talking about is the possibility of having one (or two) data outputs on the logic board not working, either because of damage at that point or even because of a fault...

@TheHat Thanks for your answer. I guess I could have also thought of that one but of course it is so well known already. Then, what is actually happening that causes the damage. Well, the logic board probably didn't get wet. The printhead itself has fluids and moisture in contact with it. But...

Before this thread drifts to a close, could a few of you respond to one question? Regarding the often seen warnings about a bad print head causing damage to a logic board (warnings which I do not discount): What sort of voltages, currents, signals or any other conditions can you visualize or...

@PeterBJ I also refill and happened on this thread with a number of your contributions. I see that you have had some trouble with cleaning a few cartridges. (post #15) Here is a trick I have used with good success. In general: 1) Soak the cartridge in Windex (with ammonia) with the nozzles...

@turbguy Just for the sake of clarity could you stipulate your idea of just what a "fatal error" is? Yes, I see what you just said about the power supply and have seen that in some other posts and other threads. But is this a technical term with a precise meaning or is it much more casual. Does...

@Technician I got it off Craigslist from a young couple who represented it as a "working printer", which in fact it actually is except for this chip fault which I don't expect they would have noticed. You can see in my first post what it was and still is doing (if I plug it in). They might...

@TheHat This is what I read: "I also have reset the logic board EPROM chip" Sorry if I misunderstood. You did say after that, that the result was an old printhead you could use for a while longer. I took that to mean that there had been a fatal error and that you had cleared it by inserting a...

@Technician Sorry, but I do not comprehend this repeated emphasis on my imputed desire to repair or even to find out what is wrong with this printhead. I have said repeatedly and repeatedly that this is NOT the case. Due to a number of very astute posts by various members, I think: 1) It is...

@turbguy Thanks. This is meat! I agree that we will never know the innermost workings but the speculation here could possibly reveal a couple of general principles, such as the "spreading out" of the data flow from a few ribbon cable conductors to thousands of individual nozzles. This, I think...

@TheHat I appreciate the last couple of lines in your post. Please keep pointing out the pitfalls. And I agree that this is all pure speculation but it has helped me to see some of the issues that I didn't find obvious before. Yes, I've seen ads for the Chinese heads but wouldn't buy it. Also...

@inkStainedFingers "if a printhead fails with a hardware failure - chip, short - whatever - how could an EEprom reset fix that problem ?" Well, no, I wouldn't think so either. But if a "reset" or rewrite of the EPROM could recover a logic board that is not physically damaged, that could be...

@PeterBJ Yes, I think both your points are well taken. I agree. But then why should we all be willing to put up with it. After all, we are all human beings and some of us (myself excluded) are smarter than most Canon engineers and a lot brighter than anyone in their legal or marketing...

@The Hat Well, I guess there's a lot I'm not taking into account since there's a lot I don't know about. I guess that there are a lot of software issues and that you are referring to just one. I welcome anything that would clarify any of these issues but I don't really get what you say. For...

Yes, I see that other cable now. It was hiding before. Can't see right off where it connects. Maybe the shorter brown object in the upper right. I think the scanner connects separately though. Just took another look and the third cable seems to have maybe 25 or 30 traces on it. I agree that...

@PeterBJ I'm confused about this (too?). I don't have an ip4200 on hand to make any real comparison and my head is too big to be stuck under the top cover for a really close look at these cables. Looks like some disassembly will be in order eventually and I'm not sure when I will have the time...

Here's an interesting point. The ribbon cables in the ip4200 have 20 and 45 conductors respectively. Just looking at the mp610, without getting it open and a close enough look to make an accurate count, the ribbon cables appear to be much smaller. They look like about a dozen conductors each. If...

@turbguy Yes, again,a little confirmation helps a lot. I had come to the conclusion that there just has to be a significant amount of logic on the nozzle die. I've only looked at it from the outside and then only at 10X. But just stop and think. There are 4608 nozzles on the mp610 so to drive...

Thanks, Stratman. I would not say boldly, though. Gingerly maybe. @PeterBJ Thanks for the references. That looks like a lot of good info. The mp610 service manual is good but does not deal with that kind of material. I guess the engineers occasionally write something good and it may find its...

Glad you know that. I'm out of touch for a long time on that sort of thing. You are saying, I think that the logic inputs to such a chip could be standard logic level, say 5V or less, while the voltages/currents being switched are higher, say 24V. Do I have that right? Do you have a nomenclature...

@InkStainedFingers Thanks again. Very useful information. No I do not have a circuit diagram but I am used to working on all kinds of strange equipment without one. It doesn't always work out but sometimes its worth a try. Actually though, I do remember having a service manual for (I think) an...