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Printer wont turn on we have a pixma mx850 after a power surge it wont power up

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  • Anonymous Mar 21, 2014

    The best description of my MX850 is that it is out of registration. The cyan seems to be the worst as far as registration.

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  • Canon Master
  • 419 Answers

This has happened a couple of times to me and usually it's one of two or three causes.

1. If you have a fused plug (as we have in the UK) check the fuse in your plug and try a different lead

2. If you're still under warranty I would definitely recommend getting it warranty serviced!

3. If not under warranty and you're uncomfortable with taking the unit apart I'd recommend contacting a local repair center.

4. If 2 & 3 don't apply the one thing I've found to work is to remove and disconnect the internal power pack module from the printer internal wiring and then reconnect it again. This seems to reset a breaker in the power pack (sometimes) and allow you to re-use the printer.


The problem with 3. is that it requires a service manual to work out how the module can be released and you would need to be confident in taking the case apart in some areas to get to the release. At present I haven't been able to locate the manual for the MX850 but the MP830 may be similar enough to handle the job.

Anyway, this fix has saved three out of four Canon printers for me and the MX850 being as expensive as it is it may well be worth the attempt.

Hope that helps.

Posted on Feb 18, 2009

  • Erick Buma Dec 25, 2010

    I tried the above, but was unsuccessful at the re-start. Is there an internal fuse or something?

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1 Answer

How to replace ink?


Hi there!

It is really easy to replace the ink for the Canon Pixma MX850. You can follow the instructions found on this website: Canon Pixma MX850 Easy Setup instructions.

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Hi Hope this help you

1. Turn off printer
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3. Keep holding down Power button and let Resume button go.
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If you can move the printhead to the center, try removing the inks and the printhead. Try to turn on with printhead removed, if power comes on you need a new printhead, if it doesn't come on the power supply or main logic board is bad.

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I believe the fix is to disconnect power cord for an hour or so.
This is truly maddening... it's a bug in the design of their power supply.  It's happened to me three times in the past few months.
The first time it happened, I haplessly stumbled onto the solution wisdos mentioned (unplugging it for a while) without realizing it.  I thought it just started working for no apparent reason.
The second time I tried all sorts of tricks (not remembering the fact that I'd disconnected the power for a period), spoke with Canon support several times and finally had to agree to have them send me a replacement printer.
I'll skip the part about not being able to get the old printer's print head and inks out to put in the new one because it wouldn't budge without the power being on.
Now, with second printer and a five-second power failure, the same deal... won't turn on.  This time I pulled the power cord from the printer and let it sit for a few hours.  Plugged it back in and it came on.  
The maddening thing is that Canon support didn't want to escalate this to someone who might understand the power supply and diagnose the problem properly... their solution was to send out a new printer.  What a waste of time, money, and effort.

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Error Code B200


Try keeping the paper only in the bottom tray (there's a tray in the bottom) Try pulling any paper out of the top and just close that top tray. Open up the head so that u can see the ink cartridges and turn the printer on and off and maybe it will center itself again. If it's still not working (even if lights aren't red and print head wont align in the center) try manually moving the head back and forth like 18 times so you can lubricate that rail in the back that's holding it. After that, re-turn it off and on again.

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1 Answer

Mp830


Canon might cover this machine as some times they will cover it as its only be 13 months depending what country you are in.

well the MP830 is a very good product and i would think about keeping it. I would maybe look at other new machines like mx850 and see if its worth buy a new one.

Where abouts are you in the world as can repair your machine if you are in the uk.

power surges will damage the machine depending how much damage it has done, it could off blown main board, psu, cartridges, printhead. So it could be worth buying a new machine.

If you are looking new machine look at the mx850.

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