Question about Canon PIXMA MX340 Wireless Office All-in-One InkJet Printer
The tray is open but the display is saying to open it and press ok. what do I do??
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Posted on Jan 02, 2017
SOURCE: wont print
The problem occurs when the paper tray is pushed down too far and 2 flimsy stop tangs on the backside of the tray hinge break off. The one on the left side contacts a microswitch, pushing it forward , signaling the printer tray is open. When the left tang breaks off, there is nothing to press the switch. You can try bending a paper clip in a fashion that hold the switch forward.
OR (the following will probably void your warranty)
Unplug the printer
Pull out the envelope tray on the bottom.
Set the printer on its back
Look just behind the bottom of the tray door from the underside
There are 2 wells on the underside. The front most wells are more square-shaped.
The 2 wells behind the are irregular-shaped. These 2 have the cover release tangs. Take a long, thin #1 flat blade screwdriver and push them outward toward the sides of the printer to release the 2 inside catches.
Next, push the screwdriver into the 2 rectangular release holes on the bottom sides of printer (beneath little arrows) to release the side tangs.
Next, release the rear tangs in similar slots in the back of the printer.
Gently lift up the cover. Lift up the electronic module on the left side.
The output tray wicroswitch is the black one on the bottom of the electronics module fix it in the upper position with either a small zip-tie or good electrical tape (the top one signals that the top cover is open to expose the ink cartridges, leave it alone).
Carefully reassemble the printer, hopefully it will work.
Remember to open the tray when you print as the preventing switch is no longer functional.
Posted on Nov 05, 2007
SOURCE: printer door open message
Further to this, the sensors can give way. Try soldering or pushing the two connections together. If you need to test, you will have to put the lid back on but you can leave the sensor out of the rinter by draping between the cover and the frame of the putput tray (be careful not to pinch it. AAMOF I leave my sensor out as even though I've pinched it together it has a habit of coming undone.
Posted on Jul 13, 2008
I solved this problem by putting a shim between the door & switch lever.
The shim is just a piece of cardboard/plastic/whatever about the thickness of a credit card & about 1/4 inch wide.
At the lower right corner of the paper outlet is an opening about 1/4 inch square. On the right side deep in this opening is a lever (rather hard to see). When the door is opened it lifts the lever up (presumably telling the printer the door is open). I took a small screwdriver, inserted it into the left side of the opening, turned it counterclockwise until it caught the edge of the lever & lifted it up, inserted the shim below the lever, & withdrew the screwdriver. This solved the problem (it has only recurred once since the shim was put in).
If the shim falls out just reinsert it. Of course, if you ever want to close the door you need to remove the shim first.
Posted on Sep 28, 2008
Just fixed this problem on mine. Need to remove the covers, watch these 2 vids to see how..
Then on the right side where the on switch is, near the hinge is a little switch with 2 yellow wires, it's probably broke. Pull the 2 wires out and solder or twist them together, then put everything back together. It will now assume the door is always open. Jobs a good'n :)
Posted on Jan 07, 2010
Its a defective printer you have that cant get out of paper output tray is close or that the paper output tray is not properly placed into the printer.
Try to reseat the output tray and let me know. If it does not work, you may need to send printer to repairs.
Posted on Mar 19, 2010
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