HP CM1312 and M2727 Multifunction LaserJet ADF Paper Jams


This past week I had a few calls on these models so I thought I would share some information about these document feeders because they can be found on several different models of machines made in the same time period as these. Below are the two most common issues I find with these units.

Scenario 1 – Not Feeding into the unit
Due to the fact that paper is fed face up through these document feeders, toner, ink, and dirt seem to contaminate the pick up and feed rollers more often than face down document feeders. To clean, open the ADF feed cover, lift the green lever on the pick up assembly, then rotate the pick mechanism until it stays open. Use a damp cloth to wipe down the two light gray pick up and feed rollers. These rollers get real dirty and  it’s usually pretty obvious after the first wipe how much dirt is on the rollers. Rotate the rollers and make sure the surface of the rollers are all cleaned off then gently wipe them down with a dry cloth to remove any left over moisture.

Note: I typically use alcohol on the rollers. HP doesn’t recommend this, just water, but after 15 years I’ve never run into problems using alcohol on HP rollers.

Scenario 2 – Jamming half-way through ADF or bunching paper
This problem typically happens because something has gotten stuck in the feed path resulting in the paper not feeding all the way through the document feed section.

  1. Lift the ADF feed cover.
  2. On the far left side is a blue-green plastic piece that can be removed to clear debris out of the feed path. Typically this plastic piece is held in place with a thick piece of tape.
  3. Gently remove the tape from the black plastic of the ADF assembly but not the green-blue plastic.
  4. Using two hands pull the green-blue plastic out and away from the unit.
  5. Look in the opening for paper or other debris that can be blocking the paper from feeding through.
  6. If you still can’t see the debris, lift the ADF assembly and check around the white spring loaded reference plate on the bottom left side of the ADF assembly. Sometimes the debris will get pinched between the ADF assembly and the white reference plate.
  7. After you have removed the debris reinstall the green-blue plastic piece and reinstall the tape.

The user manual and HP don’t talk about this tape in the jam removal instructions. What I found is that if the tape isn’t reinstalled and the green blue plastic piece isn’t taped down it can lead to more paper jam issues in this section, so this step is vital for reliable feeding.

Note: Never use pliers, paper clips or screw drivers to pry debris out of the unit. Doing so will result in scratches and burs on the plastic. This will lead to improper paper feeding through the unit.

ADF Feed Assembly removal
Removing the feed assembly is rather simple.

1.     Unplug from power and lift up the ADF feed cover.
2.     Remove screw in light gray plastic on the ADF motor cover.
3.     Unplug the wire harness to the ADF feed assembly and remove the screw that secures the grounding wire.
4.     Remove three screws in the front of the feed assembly; left, right and middle.
5.     Pull the feed assembly up and out.
6.     For re-installation, note that there are tabs in the rear of the feed assembly that fit into the plastic on the ADF unit. Make sure you get these in place to prevent jamming in the rear of the assembly.

Note: If you have to remove the ADF feed assembly, make sure you clean all the feed tires, especially the exit ones at the back of the assembly. I’ve been seeing more feed issues in this section and they are extremely hard to clean when the assembly is in place. It’s better to be pro-active and get this done when the assembly is separated from the unit.

============================================================================================
Kevin Gumpp is a certified printer technician and freelance writer for Market Point. If you have a question regarding this topic or have any other printer repair related questions or topics for which you would like more information, please send an email to maryp@marketpoint.com.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s