Jam in duplex area

Although paper jams occur because of dirty pickup rollers I have found that jams occur frequently because of solenoids in the paper feed mechanism (the assembly that the paper trays fit into). There are two of them and over time the damping foam on the levers get sticky causing the lever to operate late which causes the jam. As a fix I remove the damping foam and put insulation tape on the lever making sure the solenoid works by using a 12v bench psu before reassembling. You will need service manual because Paper Feed mechanism removal is a little complex.

Paper feed problems in Canon Laser Jet Printers are caused by these solenoids mainly in Duplex mode. P3005dn's etc.
Hope this helps solve yr problem.

Thank you contacting FixYa for your printer inquiry.
This error is associated with either a sheet of paper blocking the paper path or a partial piece of paper that blocks path or trips a sensor. The printer will usually throw up a error code 13.XX on the display and the XX is a number that will indicate where in the paper path this error most probably occurred. Just follow the steps for your error on the below chart.
This link will take you to the user guide which will be helpfull identifying components and providing guidelines for most of the helpful hints and things you will need to know about this printer.
http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c00218691/c00218691.pdf
Locate your error on the matrix below and follow the steps. Comment back if you need more help. Thank you again for contacting FixYa.
TF
HP Laserjet Error Codes 0 - 19 Message on printer Display Panel What it means. What to do. 13.XX PAPER JAM [LOCATION] Media is jammed at the specified location (and possibly at other locations). If the message persists after all jams have been cleared, a sensor or sensor lever might be stuck or broken. For all jam messages, do the following: 1. Remove jammed print media from the specified location. Check the entire paper path for other pieces of media in the path. 2. Open and close the top cover to clear the message. 3. Check sensors and flags in the paper path for proper operation. 3.0 PAPER JAM [LOCATION] A non-specific paper jam occurred. 1. Remove jammed media from the specified location. 2. Verify the paper tray is fully closed. 3. Inspect and/or replace the feed and separation rollers. 4. Ensure there is no obstruction in the path, such as a torn piece of paper. 5. Open and close the top cover to clear the message. 6. Check sensors and flags for proper operation. 13.1 PAPER JAM OPEN INPUT TRAYS Paper-delay jam at paperfeed area. 1. Ensure that paper trays are loaded and adjusted properly so media can feed from the tray. It might be necessary to reduce the stack height of media in the tray. 2. Check the input area for obstructions such as media in the path. Also check to see if the registration assembly damaged or unseated. 3. Replace any defective sensors or flags. 4. Verify the media meets the specifications. 5. Check the pickup feed and separation rollers for unusual wear. Replace as needed. 6. Rotate the media in the input tray by 180° and/or turn it over On NX engines this is most likely the fuser flag or the ACPM. The ACPM has a photosensor hard-wired to the back of it. 13.10 PAPER JAM CHECK DUPLEXER Jam at duplexer. 1. Check the duplexer and the rear area of the printer for obstructions or damage. 2. Check the duplexer for proper operation. Replace the duplexer if a sensor is defective. On a 5si, 8000, or 8100 series laserjet a Duplex Jam can be caused by a tray 2 and 3 feed assembly failure. 13.14 For Laserjet 5si. This error is caused by a defective paper control PCA Replace paper control PCA. 13.2 PAPER JAM OPEN INPUT TRAYS Paper-stopped jam at paper-feed area. 1. Check the input area for obstructions such as paper in the path. Also check to see if the registration assembly is damaged or if the transfer roller is out of place. 2. Replace any defective sensors or flags. 3. Ensure the media does not exceed the maximum length. 4. If multiple sheets are feeding, it might be necessary to fan the media and reduce the stack height. Also, replace separation pad. 5. Verify that the fuser is properly installed. On NX engines this is an input jam. 13.20 PAPER JAM CHECK REAR DOOR Media stopped in the paper path during power on or when the top door was closed. 1. Remove all media in the paper path, and then open and close the top cover. 2. If the message persists after all media is removed: Check if media is jammed in the prefeed area. Replace any defective sensors or flags 13.21 DOOR OPEN JAM The top cover was open while printing. 1. Clear the jam and close the top door. 2. If the message persists, check the top door switch for proper operation. 13.5 PAPER JAM CHECK REAR DOOR Paper-delay jam at fuser. 1. Check the transfer roller and small media belt to ensure they are operating and can feed print media. 2. Check the paper path for obstructions at the transfer roller, toner cartridge, paper feed assembly, and fuser. 3. Replace any defective sensors or flags. 4. Turn the media stack over and/ or rotate it by 180° in the input tray. If still persists - replace fuser, then DC controller. 13.6 PAPER JAM CHECK REAR DOOR Paper-stopped jam at fuser. 1. Check the paper path for obstructions at the fuser and output/delivery area. 3. Replace any defective sensors or flags. 13.99 PAPER JAM [LOCATION] A non-specific paper jam occurred. 1. Remove jammed media from the specified location. 2. Verify the paper tray is fully closed. 3. Inspect and/or replace the feed and separation rollers. 4. Ensure there is no obstruction in the path, such as a torn piece of paper. 5. Open and close the top cover to clear the message. 6. Check sensors and flags for proper operation

paper jam on hp laserjet

There is still paper stuck in the printer. try lifting the printer off of tray 2 to inspect it or here it is straight from the service manual...

Jams in tray 2

Table 7-10 Causes of tray 2 jams

Cause Solution

The feed or separation rollers are dirty, worn, or damaged. Clean the rollers. If they are dirty after cleaning, or if they are

worn or damaged, replace the rollers.

The pickup roller is worn or damaged. Replace the pickup roller.

The tray 2 paper pickup assembly drive gears are damaged

or the assembly is defective.

Check the drive gears in the paper pickup drive assembly.

Replace the pickup drive assembly if the gears are

damaged. See Paper-pickup drive assembly.

The tray 2 pickup solenoid (SL101) is damaged. 1 Disconnect the connector for the tray pickup solenoid

from the dc controller PCA (location J92).

2 Measure the resistance between the cable connectors.

3 If the measured resistance is not approximately

160 ohms for the HP LaserJet 4200/4300, or 110 ohms

for the HP LaserJet 4250/4350, replace the tray 2

pickup solenoid.

The tray 2 lifter-drive assembly or the stack position

sensor (PS107) is defective.

Replace the lifter-drive assembly. See Tray 2 lifter-drive

assembly and/or Printer switches and sensors.

The dc controller PCA is defective. Replace the dc controller PCA. See Dc controller PCA.

Dirty, worn, or deformed pick-up roller, cassette separation

roller, and cassette feed roller.

Clean the rollers if they are dirty. Replace any worn or

deformed rollers. The cassette separation roller and the

cassette feed rollare are to be replaced together.

Damaged gears in the cassette pick-up drive unit. Move the gears in the cassette pick up drive unit. If the

gears are not rotating correctly, or are damaged or worn,
replace the cassette pick-up drive unit.

Your paper feder belt has ink on it and will not feed the paper. Remove the rubber belt and clean it good and clean and use compressed air on the printer tray area. If this does not work open the front feeder tray and set your computer to print from it. After about 500 copys it will normally have c leaned itself and be ready to feed from the main roller.

Check the duplex motor that feeds the reg roller shaft - in the front of the duplex unit. I found one that was loose, when I opened the front duplex cover and moved the motor, the screw fell out! The motor gear and drive gear were not touching. Good luck

What is the model number of the copier? That would help a lot in knowing what to tell you. The paper feeders are all different. but I suspect bad rollers or sleeves.

Some of the rollers inside the printer have becomes slick with paper dust on the surfaces of the rollers. There is a printer cleaner paper available at most office supply stores and online. It is sticky on both sides. You run a sheet through the printer a couple of times and it removes the dust from the rollers. In your case, run the paper through the duplex unit too.

Problem:

The Printer's Front Panel Displays Jam At Top Cover; Open Top Cover To Clear (A7)

Cause:

Media is jammed in the fuser exit area.

Solution: Fixed! Did not fix. TRY FIRST (Solutions without parts):
1. Unsupported media. - Load supported media and set the media type correctly. 2. Dirty exit rollers. - clean the exit rollers. Paper catching on the duplex guide assembly. - Remove and reinstall the duplex guide assembly. Fuser not fully seated. - Reseat fuser







REPAIR/INSPECT/PREVENT PROCEDURE:
1. Clean feed rollers and exit rollers only when dust or
debris is visible.
2. Clean the LED assemblies.
3. Check version of print engine and image processor
firmware; as appropriate.
4. Check cleanliness of interior and exterior of printer,
including fans; if necessary, clean (dust or vacuum) these
areas.
5. Review proper operation of printer using a customer
file, if possible.
6. Review with customer all work that was performed; also
discuss how to properly care for their printer.

Rev DT: 01 22 2003

That is an exit Jam code in the fuser.
You may just have one of the fingers bent straight down blocking the paper.
There also may be a secondary code that is causing the E-4-0.
But that is where to start. Look under the exit web cover for a piece of paper crumpled in that area.
Once there you may have to remove the fiser web cover to remove that jam and straighten out the finger.
MAKE SURE IF YOU GO INTO THAT AREA TO UNPLUG THE MACHINE.