Question about Canon CanoScan D646U Flatbed Scanner

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Broken drive belt

How do I open the case, to get to the belt?

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Remove the top cover. There is a catch at the side of the hinges.

Use a plus screw driver to remove the screws underneath the cover.

Remove the cover by using a minus screw from behind, and then slide the glass out from the back.

Posted on Sep 03, 2008

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Grinding sound on start up, you can move the carrier with the light down to 1/2 way(by hand, power off) turn on power, carrier will return to start position and get a grinding sound (lock have been taken...

First of all, the grinding you are hearing is the gearing and possibly the belt fouling. This could be due to a problem with the motor which drives the gears that actuate the belt pulley. If you choose to dismantle the unit, test the motor without it being under any load (ie connected to the drive pulley), grinding at that point will point to the motor, inspect the gearing, look for chipped or broken cogs and see that the gears mesh ok. See f any shims or C clips have fallen off the spindle ends and refix. Remember to regrease the nylon gear bushes with white grease as you re-assemble.

Aug 02, 2011 | Epson Perfection 4490 Office Flatbed...

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Not moving < Agfa Duoscan T1200 Flatbed

Try this ;

Re-seat the batch of documents gently into the document feeder Confirm the automatic document feeder is closed
Connect the interface cable correctly
When the scanner is the last or only device on the SCSI bus, set the terminator switch to ON; otherwise set it to off

Hope that helps if not have the scanner replace.....

Jun 27, 2008 | Office Equipment & Supplies

1 Answer

Scan is black

If the scanner light does not move or does not light up then the problem could be a broken belt drive ob the scanner lamp or the scanner lamp is faulty.

Apr 04, 2011 | Canon CanoScan 8400F Flatbed Scanner

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Canon Lide 80 Lock Switch error message.

Had the same problem as you but was able to fix it. I basically plugged it in and out while switching the lock switch until it worked. Here is my theory:
The scanner strip got stuck further into the glass instead of tucked in behind the plastic, and i couldn't use the block switch (it was stuck)
When you plug the scanner in it moved a little, i would then be able to lock the switch.
I finally locked it into the position the furthest back, then unplugged it turned the switch to unlock and plugged it in, it worked.

My explanation is a mess but hope it helps you.

May 10, 2010 | Canon CanoScan LiDE 80 Film Flatbed...

1 Answer

No response when I turn on power.

First check to see if belt is hanging loose due to broken plastic mounts at forward mounting point.

This happened to both mine and my sister's 3170. The plate holding the belt pulley wheel is held by two very small plastic flanges. At between a year to a year and a half the flanges fatigue and break causing the forward pulley wheel to break free. With the belt no longer able to turn the scanner won't initialize, the lamp won't light and the red flashing light comes on. The fix is rather simple though. Simply drill a small hole through the bottom of the case and place a small metal screw through with the screw head placed so that it overlaps the pulley wheel base thus holding everything down snugly. Fixed both scanners with this fix. In my opinion, just poorly engineered and perhaps even "designed in obsolescence". Most people would simply toss it and buy another considering what it would cost to send it in for service. You might even get charged for a new lamp that you didn't need. That was what Epson Service diagnosed the problem as over the phone.

Jan 10, 2010 | Epson Perfection 3170 Flatbed Scanner

3 Answers

Small Pin Cam off inside of scanner looks like a clothes Pin

Remote mechanical troubleshooting is difficult.
Without the equipment in front of you, it is hard to determine the exact locations for errant parts using brief descriptions.
Thank you for using FixYa however.
Hopefully we can be of service the next time you run into a problem.
Your refund will be processed.

Apr 02, 2009 | HP Scanjet G4050 Flatbed Scanner

1 Answer

My HP scanjet 2400 light dose not move when the comand is given

From your brief description it sounds like the drive belt has either broken or the motor/gearbox that moves the scanning beam is faulty.
With all the best intentions you will probably find parts and labour for a repair will out weigh the cost of a New replacement.
Hope this helped, please remember to appraise my Free efforts by pressing the Blue Button,
Paul 'W' U.K.

Jan 30, 2009 | HP ScanJet 2400 Flatbed Scanner

1 Answer

The belt is broken

i have lost my cd of driver i lost my driver cd so pls give me the way to download ma scanners driver scanner driver

Aug 24, 2008 | Canon CanoScan D646U Flatbed Scanner

2 Answers

Epson 4180 scanner w/ possible drive belt problem

Check if you have a toggle lock at the back of your scanner, when you are facing the back of it, its on the right hand side near the tpu cable. toggle that 3x and make sure it on the UNLOCK position.

Mar 12, 2008 | Epson Perfection 4180 Photo Flatbed...

1 Answer

How do I open up a CanoScan LIDE50 so I can reattach a loose cable?


Most (but not all) desktop scanners' casing are locked in place by bottom screws. Often these screws (2~4) would be underneath the rubber feet/pad of the scanner or a sticker. In some models, there are narrow slots underneath. These slots are the locking points of the top cover and would require the use of a flat screwdriver to pry open. Still others are simple snap locks at the front/rear portion of the junctions of the top and bottom cover/panel. Other than the screw type, most opening would require a bit of force to un-snap the locks. It helps to slightly pry the joints open with a flat tool such as a metal ruler and force only on the areas determined to have the snaps.

Should you be successful in prying the halves apart, the glass is held in place sometimes by an angular plastic strip locked in place by 2 small screws.

The driver is available here. Pls be reminded that drivers are OS specific.

Hope this be of help/idea. Pls post back how things turned up of should you need additional information.

Good luck and kind regards.

Feb 04, 2008 | Canon CanoScan LIDE50 Flatbed Scanner

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