Canon Pixma 620 Loss Again Of Magenta Weak Cyan

I think you should go back to the very start again because you have introduced too many variables
and you now can’t isolate your original problem properly.

Pop in a brand new set of OEM cartridges and don’t run any cleaning cycles first,
then just run a standard nozzle check then print off one sheet with four
2.5 cm x 10 cm colour swatches and see how they turn out. (Use this one)



If you’re test print-out is not 100% then your only alternative at this stage is to get a new print head and hopefully you haven’t damaged your logic board with all of the testing and cleaning on your damaged print head..

The Hat said:

Pop in a brand new set of OEM cartridges and don’t run any cleaning cycles first,then just run a standard nozzle check then print off one sheet with four 2.5 cm x 10 cm colour swatches and see how they turn out.

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Barfl2 did write he is being sent compatible cartridges to try. This should be sufficient to test whether the cartridge is the problem although I agree that new OEM cartridges are the ideal.

If you’re test print-out is not 100% then your only alternative at this stage is to get a new print head and hopefully you haven’t damaged your logic board with all of the testing and cleaning on your damaged print head..

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Why get a new print head immediately? I understand if patience has been reached, but there definitely has not been enough done with the print head for all to go straight away to new. Barfl2 is getting, in his word, "inconsistent" results, not complete absence of results. Cyan and Magenta work and not work. If the same occurs with the new compatible cartridges then the print head is the most likely culprit and the clog should be removable with time and patience.

If it were me, I'd have already popped in a new print head if I needed to use the printer. But that's me and my stash of print heads. I still would soak and flush the living daylights out of the old print head, regardless, because it sounds revivable.

I maybe wrong but I don’t think a print head can print near perfect one minute
and then lose several of its colours the next.

That tells me that there is something badly wrong with it and when that problem
is not corrected quickly then it tends to migrates to the logic board
rendering the whole printer then useless.

If it were me then I would have bought a new print head a lot earlier in an effort to save the printer..

New I maybe wrong but I don’t think a print head can print near perfect one minute
and then lose several of its colours the next.

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I didn't get that precise impression. I guess we have different interpretations of what the OP has posted.

If he is able to print nozzle checks and then loses Cyan and/or Magenta, whether it be in future nozzle checks or during extended printing of color, then ink is able to get into the print head and make its way out appropriately some of the times. His Cyan and Magenta seem to be on/off or streaky and these alternate instead of remaining one way or the other. Based on this pattern of change - once we know it is not due to the cartridges for sure - it sounds like a print head flow issue due to a partial clog that never quite goes away and can enlarge and become a complete clog.

Have there been logic boards that behaved this way in the past on the forum, The Hat? I do not recall such.

One other thing I see looking back at earlier posts from OP, he states his Magenta has looked like "rust". Could this be contamination by another color? Hard to tell as we have seen no images and it could be that we are not all on the same page of understanding terms.

And our friend Emulator may have a point with the age of the ink creating problems.

I do agree this has been made more complicated by splitting this discussion between a couple different threads and incomplete trials at diagnosis and resolution.

Constantly pushing a print head to perform at 100% while suffering poor ink flow
due to some nozzle damage (clog) can cause an electrical overload on a logic board.

It's one of the reasons why it’s important to identify the poor output quickly
before further damage can occur elsewhere.

Without seen a nozzle print doesn’t help either and that’s why it’s important
to get back to basics and use a new set of cartridges and then re-examine the output,
then take the next step from there..

Constantly pushing a print head to perform at 100% while suffering poor ink flow
due to some nozzle damage (clog) can cause an electrical overload on a logic board.

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True, but, AFAIK from the wealth of data read on this forum, a logic board failure is a constant failure and not an intermittent problem. OP has said his color streaking and losses are intermittent if I understand what he has posted to date.

Unless his intermittent issues have now become constant, then he has an opportunity still to clear the print head IF the cartridges are not the problem.

Again, OP has made things a bit more difficult by splitting up postings on different threads than just this one:

Starter thread with images? -- http://www.printerknowledge.com/threads/canon-pixma-mp620-no-cyan.8250/#post-64081

Problem Solved! -- http://www.printerknowledge.com/threads/canon-pixma-620-no-cyan-now-solved.8257/#post-64220

That's as much as I care to look for OP's threads.

The only thing we can do now is to wait for the new cartridges to arrive
and then see a a new printed nozzle check and all will be revealed, hopefully..

Emulator said:

Have you tried a new batch of ink. I had light cyan colour shift problems which after much frustration turned out to be a bad bottle of ink.

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Interesting thought after a long run of magenta problems previously OctoinkJet picked up on my posts and kindly sent me a fresh bottle, and I as now nearly out likewise nearly out of cyan apart from several carts which were prefilled.

I bought this printer as ex demo it arrived spotless like new but with compatible carts in, so I do not know its previous history. When it is going it is very good. The problems have always been with just cyan/magenta. I do not know whether to buy another inkset or invest in another printer.

I know Stratman means well with his view of the possible clogs in the print head but my gut instinct still leans towards the carts. and I want to avoid too much soaking if I can. When I tried to extract some ink from a cyan carts (German) I got mostly foam and that started alarm bells ringing. Yet in post 6 I used a purged top fill cyan and still had the problem, switched it for a previously tried top fill and hey presto it all fine again and it still is today.

Today used my HP Photosmart 7760 first time for 2 months worked first time perfect. These Tri-carts may not refill very readily (I use compatibles my son OEM) but they are very reliable and unfussy printers compared to this 620

Sorry messed that upload the post above is the current state of my nozzle checks. Looks fine to me am holding the NEW compatible carts in reserve and see how things play out. Another thought instead of just shoving another cyan cart in when it gets low but refill this one which seems to be working fine