MP 780 Front door will not close - Canon Office Equipment & Supplies

To the left of paper tray 1. Small door with one screw from the top. Open front door to remove screw from this small door. Close front door and open small door. Slide waste bottle out the front of machine.

open the front door of the machine.
remove the toner unit gently .
replace toner bottle.
refix the toner unit ans close the door .
wait for toner to load.
good luck..

open the right cover where you normally remove the paper jams,then open front cover/door where you put toner,lift the green handle up,push green lock towards the right side while pulling the hopper out,then theres a connector beneath the PCU,pull it then pull out the PCU,use the same same procedure to put it in,start with the PCU,return the connector and put in the hopper,then close all doors/covers

Paper feeding kit for MP tray

(1) Disconnect the AC cord from the Printer.
(2) Press the front cover release button.
(3) Open the Front cover.
(4) Remove the Drum/toner ASSY.

Open the MP feed frame cover. (6) Remove the Holder bearing MP. Lift up the Lift arm MP to release it from the Pin of the MP roller holder ASSY. (8) Slide the MP roller holder ASSY to the direction of the arrow 8a and put it up to remove. Fig. 3-77 (9) Turn the back side of the Separation pad ASSY MP to the direction of the arrow 9a and put it up to remove. Fig. 3-78 Separation pad ASSY MP MP roller holder ASSY Pin MP feed frame Lift arm MP 7 8a 8b MP feed frame MP frame 9b 9a

(1) Put the Hook of the Separation pad ASSY MP into the MP feed frame and pull down the Separation pad ASSY MP to the direction of the arrow 1b until it is locked. Fig. 3-79 (2) Lift up the Lift arm MP and put the MP roller holder ASSY into the MP feed frame. Put the Pin of the MP roller holder ASSY into the hole of the Lift arm MP. Fig. 3-80 Separation pad ASSY MP MP roller holder ASSY Pin MP feed frame MP frame MP feed frame Lift arm MP
(3) Put the Holder bearing MP into the MP feed frame and turn the Holder bearing MP to the direction of the arrow 3c to lock. (4) Close the MP feed frame cover. Holder bearing MP Hook MP feed frame cover Front cover MP feed frame 3a 3b 3c MP feed frame(5) Install the Drum/toner ASSY into the Printer. (6) Close the Front cover. (7) Connect the AC cord into the Printer. Printer AC cord Drum /toner ASSY Front cover .





I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

when the door closed it actually activates the switch. see on the door if any plastic piece from the frame is broken or not and locate where in the machine does the front cover activates switch. it will be easy to find the broken part.

Most probably is PURGE UNIT not functioning well. If print out still acceptable then just ignore the ink stain.

Remove the black cartridge and soak it with an alcohol free window cleaner soaked paper towel let it sit on the towel for a good thirty minutes then wipe clean and put back in printer run nozzle check if necessary.

change the paper source on the lcd screen.

Download the manual for the MP 620  instruction. 
780 and 620 models use second link and look up  your own.
http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDetailTabAct&fcategoryid=238&modelid=15483#DownloadDetailAct


http://www.usa.canon.com/consumer/controller?act=SupportIndexAct

check out these sites

http://software.canon-europe.com/

or

http://driverscollection.com/?H=PIXMA%20MP780&By=Canon


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