Repairing the ADF on the HP LaserJet M1210 series Multifunction printers.

The HP LaserJet Professional M1212 has an Automatic Document Feeder (ADF) which allows it to scan up to 35 pages in sequence.

Some ADF mechanisms get heavy use, and the pickup roller and pad will then wear out and give frequent misfeeds. ADF mechanisms can be liable to misfeed anyway because they deal with a variety of paper depending on who created the incomming documents.

The parts likely to wear out are easily changed; the rollers are in the ADF lid and the pad unclips.

This page aims to help users and service technicians repair the ADF by replacing the two parts most prone to wear. A much fuller treatment can be found in HP's M1130/M1210 Service Manual Part Number: CE841-90985 Edition 1, 4/2010. Illustrations here are derived from that document - we think that is a fair use because it helps sell HP Parts and meet their environment policy.

The line drawings give an idea how the parts fit.

The pickup roller bogie goes in the ADF top cover and is driven by a shaft extending to the rear.

The friction pad goes into a recess in the ADF core which contains the motor, sensors and some of the paper drive rollers.

HP's service manual also seems to think the separation pad CB780-8009 might be needed.

The picture to the right shows how the feed and pickup rollers fit in the ADF top cover. The drive shaft is visible at the bottom of the picture and it drives the feed roller. Then a cog chain in takes power almost to the top of the cover.

The bogie that holds the ADF pickup roller is hinged on the two retainers at the top. It is held against the retainers by the black and white transmission gears. It is pushed into position by the spring.

To replace the bogie note the position of the spring and the two transmission gears as installed in the printer. The replacement goes back in the same place. Spring and gears may not be available as spares.

Use a flat-blade screwdriver to prise the bogie off the two retainers and lift the bogie and the white transmission gear out of its hole. The transmission gears are lose on their shaft so avoid losing them.

Transfer the spring and gears to the new bogie. Position the bogie so that the shaft on the white transmission gear goes into its hole in the lid, then push the bogie onto the retainers. The gear holds the bogie up against the retainers.

Friction Pad

The friction pad sits under what seems to be more of a feed roller than a pickup roller. The pad carrier is spring loaded from below and pivoted.

To remove the pad push down on the left hand side and push the assembly rightwards - against the normal direction of paper travel. The tabs latching it into place will disengage from the ADF core and the spring will pop the carrier out of the hole. Don't lose the spring !

Lift the left hand tabs out of the hole then move the pad slightly leftwards so that the pivot points lift out of their slots.

Reverse the process to put the new pad in place.

Avoid touching the rubber middle part of a new pad so far as possible. Oil from human fingers might de-nature the rubber on the pad, which is intended to have a very specific composition.

Put the spring onto its pedestal in the pad recess. The pivot parts of the pad go into their recess, then the tabs go into their locating holes.

Press on the edges of the pad, down and a bit leftwards, so that the tabs come up in their retained position.

Separation Pad

The separation pad goes under the pickup roller. HP don't seem to have a section on changing it in the service manual. It looks as though it will be a matter of levering the old one out and sticky-back adhesive holding the new one in place.

Copyright G & J Huskinson & MindMachine Associates Ltd 2013, 2015, 2016. Some pictures derived from HP User and Service guides. These technical pages do not constitute an offer for sale; just our knowledge at the time of writing. See the catalog. Sales pages on this Web site use cookies to store user information. We also use Google Analytics to track site usage patterns.