The end of the MX7600: CONTINUED

palombian

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This morning my good old MX7600 showed a B200 error.
Error light continues to blink after entered service mode, no way to enter commands (=nr of pushes).
Suppose it's the logic board.
Carriage does not move when opening printer either.
 

The Hat

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This morning my good old MX7600 showed a B200 error.

If it was the logic board then you printer wouldn’t be able to do anything at all, try removing the print head and cartridges and power off for 5 minutes.

Power on again and see if the B200 error is gone, you may need to use another print head to clear the EPROM memory, to get everything back to normal again..
 

palombian

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Printhead doesn't move.
I think I'll have to open the printer to unlock the carriage.
Thanks for giving me courage.
 

PeterBJ

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I think the situation is the same as with this MP970. I think installing a new print head would be very risky.
 

palombian

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I have 2 printheads who produced errors before to test.
Changing heads can make them work again indeed, at least for some time.
I'll try with those first.

Still have one new head sealed ...
 

PeterBJ

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If the print heads with errors have no electronic errors but only clogs and the one used for testing survives, I think it is safe to install the new print head.
 

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Changing heads can make them work again indeed, at least for some time.
I swap between damaged print heads from time to time to resolve the dreaded B200 error, it has worked for me without issues, I’ve not lost a logic board Yet...:hide
 

palombian

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I swap between damaged print heads from time to time to resolve the dreaded B200 error, it has worked for me without issues, I’ve not lost a logic board Yet...:hide

I dismantled the case to be able to access the printhead (don't know why the carriage was blocked, suspected the purge unit for a while).
Installed an old printhead, replaced the top and the necessary connectors (for the scanner unit).
Received error B052: replace printhead, but the carriage moved again to the center.
Replaced the original head and I have the printer back :).

IMO this confirms @The Hat 's theory !
 

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In my experience the printer B200 error indicates the printer is sniffing some trouble ahead.

The old printhead had a perfect nozzle check after reinstall, but after about 50 pages developed an electrical failure in the cyan (lower half lighter color).

This morning I still could print about 20 pages but then B200 again.
Replaced with the previous one (I could move the head this time) that returned B052 (wrong printhead).
My third one gave B200 immediatily (as when it was removed).

I have now heads B200 and 1 B052 (who together must have printer about 40.000 pages).

Since the reaction of the printer is consistent, I should conclude the printer is in good shape and the heads broken.
Difference with @The Hat is that mine are not clogged but seem to return wrong signals.
This could of course also point to a weakness in the logic board.
But the actual printer only has 6000 pages.

I think I will open my brand new printhead ...
 

PeterBJ

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I have also experienced a Canon print head run too hot and get progressively worse and finally fail, but not giving an error message. See this (long) thread. First I thought that some problems with an iP4000 were caused by a dirty switch, but they were caused by a print head running hot, and one of my iP4000's was worse.

Here is a service test print from the start of the testing:

iP4000 service prints red size.jpg


And here from a test today. The printer has not been used since the testing apart from one test printing. It is seen the print head is now much hotter and PGBK has failed:

iP4000-hot-4.jpg


I hope your hot print heads have not damaged the logic board so your new print head will be damaged. I wish you good luck with the repair.
 

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