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How do you release the scanner lock switch on the MP990

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Open the document cover of the scanner decision, you should be able to slide the release lock switch towards the hinge side of the document cover. There is a padlock symbol on each side of the switch; the side closer to the hinge is an unlocked padlock. The other side has a locked padlock symbol. If the all-in-one was on, turn it off and wait 5 seconds before turning it back on after unlocking the unit.

If the switch is in the unlocked position and turning the printer off and then on again doesn't resolve the error, the unit needs service. Contact Canon if it is under warranty. (Otherwise, decide if the printer is worth the service call.)

I hope this helps.

Cindy Wells

Posted on Oct 31, 2012

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Ink absorber full on a canon mp990 - Canon PIXMA MP990 All-In-One InkJet Printer


Try the following steps. I tried it on my MP990 and it worked.
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  2. Press and hold the Resume button (triangle inside a circle).
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Hi ,
Disconnect your unit from your pc ( usb and power)
Insert your install cd and run the program
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I just installed my new Canon LiDE 110 scanner. I slid the lock button to the unlock position. When I try to scan, I get the following error: "Release the lock switch, detach USB cable and...


mbrindle is great!!!! Many thanks - I was just about to take it back as I thought the scanner was defective. Would never have thought i had to do that. Thanks!!!

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I am having a problem with my printer. When I turn it on the copy light is on and the feed switch light and the alarm light and it says in the screen release the scanner lock switch and turn the power off...


Issue: ERROR LCD: Release the scanner lock switch and turn the power off and back on.
--------------------------------------------------------------------------------
Solution: Unlock the scanner lock switch

The scanner must be unlocked before turning the unit on.

Turn off the power.

Lift the document cover.

The scanner lock switch is on the left hand side of the underside of the document cover.

Slide the scanner lock switch to the release mark (an open padlock icon).

Lock the switch before transporting.

Close the document cover.

Turn the machine on.

If machine still is not working repeat the power off / on cycle waiting 5 seconds in between.

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-is this a new scanner? is this the first time you are trying to scan?
if you answer yes to any of this questions, please check underneath the scanner, find the latch to release the scanning head.

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There is a switch on the underside on the scanner. This is the lock switch. Flipping it should solve your problem.

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Hi muffin, Turn off the machine, open the document cover, and then release the scanner lock switch. You'll see it. Any other problems let me know. Peace, Dude

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