My hp laserjet pro 400 color mpf m475n printer is indicating "paper jam....open back door to clear jam" please describe how I will go about this process.
SOURCE: Carriage Paper Jam in Photosmart hp c6180 all-in-one-printer
Here's what you do. Take a look at the photo below.
Open the cover of the printer, where the ink cartridges are located. Behind the ink cartridges is the carriage, which is a box that moves side-to-side on a pair of rails. It's the thing that sprays the ink onto the paper.
You have to reach in with your hand and slide this thing to the center. Then, look to the very sides, left and right, for any bits of paper. If you look at the second picture, you can see my finger pointing to a small bit of paper that tore of and got jammed into the side. See the little crumpled bit of paper? It's preventing the carriage from sliding all the way to the right. You could have little bits on the right or left side. I had to reach in with needle-nose pliers to grab the paper bits out, but maybe your fingers are small enough.
Once the little bits of paper were out, I was back in business. Good luck!
SOURCE: HP 3015 Laserjet paper jam error message
The paper is probably jammed between the fuser and the rear cover if you can't see it.
SOURCE: My HP Color Laserjet 3600n had a paper jam. The
Your best method of troubleshooting is the manual sensor test as this is a generic paper jam error.
on your sensor tests:
0 = off
1 = on
A = TOP OF PAGE SENSOR
B = PAPER LOOP SENSOR
C = N/A
D = FUSER PAPER SENSOR
E = DELIVERY-TRAY PAPER-FULL SENSOR
F = FUSER PRESSURE-RELEASE SENSOR
G = MEDIA SENSOR
H = N/A
I = MP TRAY SENSOR
J = CASSETTE SENSOR
K = DOOR OPEN DETECTION SWITCH
L = DEVELOPING ESTRANGEMENT SENSOR - CLR
M = DEVELOPING ESTRANGEMENT SENSOR - BLK
N = MP TRAY MEDIA POSITION SENSOR
A-F are paper path sensors - you can toggle them and watch if they change from 0 to 1. If they do, the problem is not in that area.
G can have states from 0-7 each one representing a different type of paper - shouldn't have anything to do with jamming.
hope this helps. probably a tiny piece of paper or toner somewhere. could also be a torsion spring out of position on a flag.
SOURCE: Paper Jam at HP LaserJet P2055d
There is output sensor where the papers come out, make sure its lowered down, be VERY CAREFUL not to break it.
SOURCE: HP Officejet Pro 8500 printer message "Paper jam"
An error code showing that there is paper jam alert, but no paper is in anywhere in the machine except in the tray.....I have checked all areas, taken the back carriage of the unit, opened the top and opened the machine. removed the paper tray, everything, but there is no paper stuck in the unit
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