There are several thing which may cause unexpected jams in the duplex tray...,
1. first thing to do is eliminate all other possibilities by removing the netCard/Net connection Parralel connection so the machine is Stand Alone. make sure there is paper in the feed cassette 2 ( paper Tray)
press the TICK to enter menu
scroll down to diagnostic- press TICK
scroll down to paper path test - press Tick
scroll down to Source and select tray 2
scroll down to Duplex And select YES
( if the duplex option is not visible here then there is a connection/seating problem with the duplex tray)
Scroll down to copies and select 10
scroll up to print test page and press tick
the machine should now start duplexing 10 pages,
if you get the same error ( 1 page enters then jams)
it could be a dirty/snapped paper entry sensor,( looks like a little plastic match stick that protrudes into the feed path of the paper)
use a can of pressurised air to Blast any dust away from this arm and the surrounding area being careful to follow the Paper sensor Arm back to the sensor and blasting this as well-
Duplexer tray are cheaper than an engineer call out, if the fix above fails , your cheapest option may be a replacement Duplexer tray, available from most HP office equipment Stores as well as Belmonte Business Equipment.
SOURCE: Duplexer problem
First, the machine always prints the first page first. Make sure you have the right driver (4 plus and not 4)and check the settings in the device settings of your printer driver on the pc. Also make sure the duplex unit is for the 4 plus and not the 4.
SOURCE: paper jam on hpc7280 printer noise from duplexer area NO PAPER JAM
Follow the instructions in this video. If you follow those instructions and still get the message, you may need to replace your printer or the rear door.
) to turn off the product.
3. Disconnect the power cord from the rear of the product.
4. Unplug the power cord from the wall outlet.
5. Turn the product around so that you can access the rear side.
6. Push in the button on either side of the two-sided printing accessory (duplexer), and then remove the duplexer.
7. Gently remove any jammed paper or bits of torn paper from the rollers inside the product. Use both hands to pull any whole sheets of paper to avoid tearing them.
8. If you do not see jammed paper in the rear access area, push the buttons on the latch on the rear of the duplexer, and then lower the cover.
9. Remove any jammed paper from inside the duplexer.
10. Close the duplexer cover.
11. Gently push the duplexer into the product until it snaps firmly into place. Do not press the buttons on the end of the accessory while you reattach it.
12. Reconnect the power cord to the rear of the product.
13. Plug the power cord back into the wall outlet.
14. Press the Power button ( ) to turn on the product.
Step two: Clear the jam from the rear of the product
CAUTION:
Never pull jammed paper from the front of the product. If you can pull it from the rear of the product or the tray, always try the rear first. Pulling paper from inside the front cover can cause mechanical damage to the product.
) to turn off the product.
1 - Press the buttons on the sides of the duplexer
2 - Pull the duplexer out of product
CAUTION:
Use a flashlight to thoroughly check the rollers and wheels for torn pieces of paper that might remain inside the product. If any torn pieces of paper remain inside the product, more jams are likely to occur.
Figure 4: Remove scraps of paper
1 - Latch on rear of the duplexer
2 - Duplexer cover
) to turn on the product. ) to turn on the product. 
).
) to select Print Report , and then press OK . ) to select Self-Test Report , and then press OK . The self-test report prints.432 views
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