Question about Canon PIXMA MP780 All-In-One InkJet Printer

3 Answers

MP780 - LCD Display off

The Canon MP 780 does not even power on. I have changed the power cord. the LCD display does not light up , however, it shows some vertical bars as soon I plug the power on. When pressing, on button, it does not seem to be doing anything as if the printer is dead.

 

The day before this problem, I did receive a wrong cartridge error

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  • Anonymous Nov 05, 2007

    4 Nov 2007 - MP78 - Today I received a cartridge is low indicator. I replace two cartridges and then received a "wrong cartridge" message. I put the old cartridges back in and still had the message. Within a half hour, the entire PIXMA MP780 machine had lost power. I tried another power cord and no luck. The "wrong cartridge" message apparently is a forewarning the entire machine has lost the ability to work, and within a short time, will completely lose power. The PIXMA MP780 worked great, when it still worked.

  • Anonymous Nov 21, 2008

    Same problem! Do I need to replace this or can it be fixed?

  • gsakayan Mar 07, 2009

    Canon Pixma MP780, I was getting an error message "press ok button" and alarm light was on. Could not clear the message so I unplugged it started it up again. It began to cycle then cut off and now will not turn on.

    I checked the power cord (which has a fuse in it) but find that it is ok. Can't figure out what went wrong or if it is fixable.



    George

  • Anonymous Apr 08, 2009

    The in use/memory light is flashing. unable to power down states" machine in use cannot turn off" tried disconnecting and reconnecting everything and still having issues


  • dpmanley Apr 15, 2009

    RE: I'm having the exact same problem. I got an error message, went to check the tanks but they wouldn't slide over. When I closed the top I noticed the LCD screen was blank except for these bars across the bottom. Its completely dead. A repair shop said we needed to "replace the mother board" which will cost $500! That's more than we paid for the machine!
    ME TOO...was working great until sudden blank screen...haven't got to service shop point, assume more trouble/money than a new printer.

  • Anonymous Apr 18, 2009

    is there a solution yet?

  • joneswoods1 May 10, 2009

    The Canon MP 780 does not even power on. I have changed the power cord.the LCD display does not light up , however, it shows some verticalbars as soon I plug the power on. When pressing, on button, it does notseem to be doing anything as if the printer is dead

  • christoph359 May 21, 2009

    With the power cable in it just shows a blank lcd with small dots along the bottom (this appears to confirm that it has power), I swapped the power cable to no effect. I haven`t looked inside yet :-(

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Same problem - for a few days the LCD screen showed garbage intermittently , then machine wouldn't power up and out of warranty. Good machine til then.

Posted on Apr 23, 2009

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Does someone know how to repair this im trying to get more info on this looks like a bug i will post as soon as i find it

Posted on May 10, 2009

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I'm having the exact same problem. I got an error message, went to check the tanks but they wouldn't slide over. When I closed the top I noticed the LCD screen was blank except for these bars across the bottom. Its completely dead. A repair shop said we needed to "replace the mother board" which will cost $500! That's more than we paid for the machine!

Posted on Oct 14, 2007

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1 Answer

Power is on to my Canon Pixma MP780, but no display


I got such problem on my MP 780 (grayed boxes on bottom LCD line, no function). It turned out to be missing 1.5V for CPU core. On revese (solder) side of mainboard i found point described as "1.5V". I've powered this from external supply (took about 2 amperes) for few seconds and MP is alive again (without external supply).

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Hi there,

Here are few steps on "HOW TO INSTALL THE PRINTER" mp780

1. connect the Power Cord.
- Connect the one end of the power cord at the rear end of the pronter.
- Connect the other end to the AC outlet.

2. Use the << / >> button on the printer to select the machine languange will be use.

3. If the printer display prompted you to "Install Cartridge". This means that the printer has no cartridge installed and you may need to do it manually. Go to Steps 4-A for the guidance.

4A. Press the Open Button to open the Paper Output Tray of the Printer. Then lift the Scanning unit unitl it locks into place.

5. Open the two inner cover inside the printer.
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6. Raise the lock lever.

7. Remove the protective cap on the in k cartridge .

8. Insert the Cartridge into the holder.


You must have the installer CD available with you.

Let me hear from you again for further asssitance.



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Remove the print head and cartridges.Unplug machine for 30 min.
Repower and reseat head and ink do a head alignment.
If this does not correct it may require service.
Ink Cartridges are the BCI6 and 3 series correct?
If using CLI8's and they are flashing red you have a bad cartridge or it is in the wrong location.If so Canon will replace the bad cartridge.

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