Question about HP LASERJET PRO 400 COLOR MFP M475DN
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.
There is an access door in the back of the printer. Open the door and you should see jammed paper. If not then you have a faulty sensor or switch.
Posted on Apr 15, 2014
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!
Posted on Apr 20, 2009
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.
Posted on May 10, 2010
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
Posted on Jul 02, 2010
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