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

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Cannon pixma 780

Please Wait is flashing all the time. Unplug both pwr and USB for a day then plug in just pwr Plaese Wait still there. No lights for copy, fax,scan or photo. Pwr button does nothing and stop reset same result. Tried new USB cable nothing.

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  • Anonymous Nov 16, 2008

    I have the same problem, anybody has a solution

  • jim_spinger Nov 20, 2008

    I have the same problem. If I just leave the printer flashing sometimes after a couple of hours sometimes after a few days it will continue through the power on sequence and work. After that it is fine until we have another power outage and it tries to turn back on. It seems to be something in the power up check, like the head position sensor.


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Is your printer under warranty? If yes, ask warranty cover please.

Posted on Sep 24, 2008

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Cannon mp170 orange light flashes twice then pauses then flashes twice and so on i cant get my printer to do anything

Try resetting the printer:

1 - power off.
2 - hold stop/reset ,hold ON/OFF
3 - release stop/reset, push stop/reset twice, quickly, then release ON/OFF
4 - wait untill LCD display shows "Canon Idle",then push stop/reset four times, quickly
5 - then push power twice, quickly
6 - power off and power on.

Nov 27, 2011 | Canon PIXMA MP170 All-In-One InkJet...

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The printer turns on and the lights flash. there is also an error code 5010. I tried to hold the power button to force a color test but nothing happens?

Try these solutions:

  • Reset your printer: turn it off, wait 10 seconds then turn it back on
  • Do service reset: turn off your printer, unplug power cord, press ON/OFF button 5 times, plug power cord back in and turn on printer
If none of this helps, your printer may require repair.

If I helped you, please take time to rate my answer :)

Sep 07, 2011 | Canon PIXMA MP600 all-In-One InkJet...

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Error e then 7 flashes in window

I dont know why Cannon persist wuth there stupid messages by morse code,
E 7 means that a sensor has detected an incorrect ink cartridge
Options to fix
1.Check the ink cartridges are correctly installed
2. If you have recently replaced an ink cartridge with one from a supplier other than Cannon feplace the cartridge with a Cannon branded prosduct
3. If everything looks ok then try powering down the printer, unplug wait 2 minutes for all residual power to drain, then power up to see if the printer has resolved the problem, this just resets the sensor which reports the error but it often works as the sensors are the most likely part to give intermitten faults

Sep 25, 2009 | Canon PIXMA MP210 Photo All-In-One Printer

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Canon pixma mp540 error 5100 . What is error 5100?

Error 5100 points to a "carriage jam"
The carriage is the assembly that contains the printhead and cartridges.
This error can be difficult to solve because various things can cause it.

Since this is a new printer, maybe there is some packing or packing tape that is obstructing the carriage.
Verify that the carts and printhead are installed properly.

Check the gears as best you can for any obstructions.

If the carriage moves to a center position when you open the cover as if to change cartridges, try a reset to clear the error message :

1. Turn off printer (use button, don't unplug)

2. Hold down Resume button and press Power button.

3. Keep holding down Power button and let Resume button go.

4. Press Resume button 2 times then let BOTH buttons go.

5. Green lights will flash and then stop blinking.

6. When green lights are solid, press the Resume button 4 times.

7. Press the Power button and the printer should turn off, if not, press the Power button once more.

8. Your printer should respond as normal

Sometimes you have to try this a couple of times, if you've never done it before.
If this does not work, unplug, wait 3-4 min, then re-plug in. Enjoy..

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1 Answer


According to the service manual, that is an 'ASF (cam) sensor error' and solution being to replace the 'Sheet feed unit'.

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