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***Make sure that you plugged the cable that comes from the camera detect PCB (sensor) into the document board assy (metal part under the plastic tray).*** You said you checked all the connections, but I would recheck them, and trace them all the way through the metal lift mechanism...the cabling has junctions that run through the metal box all the way across to the right side of the machine and plug into the 10Sub PCB. You will have to remove the metal lift mechanism and unplug to cables from the 10Sub PCB. You will also have to separate the upper and lower parts of the metal box. You might as well clean the metal box out, check the plastic gears, make sure the motor is plugged in, and regrease the plastic gears if they look like they need it. Check the wiring for crimps or breaks too. When you reassemble the box, make sure that the black "U" shaped photo interrupter doesn't get knocked out of place. If everything still looks ok, I would replace the sensor and retest. The buzzing noise from the lift tray may or may not be related. There is a stepping motor in the lift tray assy that could have a problem. Order them both, they are pretty cheap.
If you have a scanner with the manufacturing date of 3/09 - 8/09, then yes, the clicking noise is more noticeable after it heats up. The problem resides in the glass mounting that was made in production in those months. The glass mounting raises up and if scanning thick paper or cards it will jam up. This must be sent back to fujitsu to replace the base assembly, because this is a defect that affected thousands of customers.
Normally Canon scanners work well for long time, Change the pickup rollers for every 250,000 pages and check other rollers for every 500,000 pages. In case you have been scanning documents with quite a good amount of dust, you may need to check at an earlier interval. Replace any worn out roller. Check if the small bearings at the end of each roller is perfect. Clean thoroughly all the rollers, dont use solvents.
S. Mohan, Chenna, India
This is clear roller problem. Clean the rollers thoroughly witha damp cloth. The ****** rollers should ideally be cleaned in power-off mode. This should solve paper feeding problems. Check if the pages are dusty.
The rollers last for about 250,000 scans. If it has crossed this number, you need to change them.
S. Mohan, Chennai, India
There is usually a slide type button somewhere around the outside of the scanner and it usually has a lock & unlock sybol on it. You may want to make sure that it is slid totally in the unlock position because it could be getting caught inside once in a while if the button is say half way between lock and unlock... Hope this helps...
Is there a gear grinding noise associated with this? If so, call your local dealer for service.
If not:Clean all the rollers you can reach with a cloth dampened with alcohol. Check for any obstructions in the paper path like torn paper, heavy toner buildup on guide plates or the edges of the scanning glass, or any paper guides obviously loose or out of place.