My pinter says paper jam I have have taken the back portion off and then looked thru the paper window with door open as best I can as best the wheels turn but when it start s to print I cam hear it whirring and then it says out of paper which it is not. Your tech person on the phone tells me to call apple. What one earth does apple have to do wuth a mechanical printing issue!!! Yes, I have a MAC

Have a look inside and see if there are any scraps of paper in the paper path. The sensor could be seeing a portion of paper. Next, open all the doors up and take out the toner and put it back in to make the machine reset.

Often when you get this error, there is a jam that is very difficult to see. You need to open the printer, remove the bottom two cartridges and the transfer belt. Then close the door part way and look straight down inside the printer. That part of the printer is called the registraion assembly and there is a paper sensor in there that often gets stuck with a small piece of paper after a paper jam is removed. You can carefully lift up on that assembly to unseat it and have a look underneath..

Welcome to FixYa!

If the first symbol on the top is constantly blinking as shown in the picture below, It means that a paper or a foreign object has jammed your printer.



Jam can occur in 3 areas. Please refer to the image below.
1. Internal Areas
2. Input Trays
3. The Output Bins


To clear the jam, turn the printer off and disconnect the power cord. Be careful not to tear the paper in case of a paper jam. If a small piece of paper remains in the printer, it could cause additional paper jam.

Let's clear out the Internal Areas first. Push the button to open the print-cartridge door, and then remove the print cartridge. To prevent damage, do not expose the print cartridge to light. Cover it with a piece of paper. Please refer to the image below.


If jammed paper is visible, grasp it with both hands and slowly pull it out of the printer. Please refer to the image below.

If no paper was jammed inside the print-cartridge door, open the Output Bin or the back door
of the printer. To avoid damaging the printer, do not attempt to clear a jam in the top output bin by pulling the paper straight out.

Again, if jammed paper is visible, grasp it with both hands and slowly pull it out of the printer.
If no paper or foreign object is visible, close the back door of the printer.

Next, let's take a look at the Input Tray. (We have already taken out the print cartridge.)
Lift the Tray 1 roller cover, grasp the jammed paper or foreign object, and slowly pull it out of the printer. Please refer to the image below.

If no jammed paper is or foreign object is visible, open Tray 2 and see if a paper is visible. Again remove it slowly with both hands. Please refer to the image below.

Close Tray 2.
If no jammed paper is visible in the second tray area, pull down the upper media guide (we have already taken out the print cartridge). With both hands, grasp the jammed paper and slowly pull it out of the printer. Please refer to the image below.

Close the upper media guide and return back the print cartridge. Please refer to the image below.


These steps should clear out any jams that you are experiencing.
Connect back the power cord again and turn on your printer. You should be able to print now.

Thanks for using FixYa. Keep me posted.
Jas247

Here is a link to a detailed description from HP.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01673676&tmp_track_link=ot_faqs/top_issues/en_us/c01673676/loc:4&lc=en&dlc=en&cc=us&product=3794615

Hi
Error 6A00
The 6A00 is a Canon generic code for paper path jam.

Solution 1:
Move the printhead carriage back and forth a few times.

Solution 2:
Check the purge unit: Moving the print head assembly will not clear a purge unit if its jammed with paper, paper clips, push pins, screws, cookie crisp, flower bud pods or the like.

Solution 3:
Press the ink pads down in the purge unit.

All I ask is please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

There is a black guide plate that opens partially when you open the back door, there's a sensor flag on that cover that goes thru the right side to a sensor, the arm on the guide needs to move freely, and the flag on the right must pass thru the sensor inside a hole on the right...

MOST HP PRINTERS HAVE A DOOR ON THE BACK SIDE OF THE PRINTER THAT CAN BE OPENED TO REMOVE A PAPER JAM. HAVE YOU TRIED USING THIS TO CLEAN THE PAPER JAM. THERE MIGHT BE SOMETHING STUCK IN THE PAPER PATH THAT IS CAUSING THE JAMS. CHECK THE WHOLE PAPER PATH FROM THIS REAR ACCESS DOOR. OK?

ARCLIGHT1217

try this..

1. Turn off the printer.
2. Remove any paper trays. Inspect them for wrinkled or damaged paper.
3. Also open the back cover of the printer if this model has one.
4. Open any other doors that give access to the printer's paper path and to the toner or ink cartridge.
5. If necessary, remove the toner or ink cartridge. Place it away from light/ sun light to avoid damaging it.
6. If you find a piece of jammed paper, remove it by holding it with both hands and pulling firmly. The goal is to keep the paper from tearing. If several pieces are jammed together, try pulling out the middle piece first to loosen the jam.
7. If the paper does tear, try rotating the roller gears manually to free the paper. Don't force anything, though. Do this step especially if the jam message comes up repeatedly without any obvious paper jam, there may be a small tear of paper inside.
8. Ones the printer is free of paper Replace the toner or ink cartridge and paper trays, close any doors you opened and turn the printer back on.
9. If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.
10. see alternative if the problem is still not solved.
    

alternative :
Load a piece of thick paper, for example photo paper and press the resume button (may be diffrent button on diffrent models) a few times to the printer picks up the paper and puts it through the machine.

Try this linke below.
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=411171&prodTypeId=18972&prodSeriesId=411171&objectID=c00642524

Or i cut and paste text, but you should view pictures. If you cannot get to it from link. Try typing "Paper jams alternating between front and back door" It should be first link from HP about a 3550.

document.tlSearch.tx.value=unescape("")
HP Color LaserJet 3500, 3550, and 3700 Series Printers - Paper Jams Alternating Between Front and Back Door Issue Description Customers may see paper jams error messages with no paper seen in the paper path. The message will alternate between check the front door and the back door. Workaround The release lever engagement tabs on the rear door can be bumped into the in-correct position. The purpose for this tab is to re-engage the fuser release levers as the rear door is closed. When one or both of these are left in the in-correct position the printer goes into a cycle of alternating between a "Jam in the Front Door" message and "Jam in the Rear Door" message. There is no paper present in the paper path when this happens. When a customer gets the "Jam in the Front Door" message and opens the front door, no paper is found. After the customer closes the front door, they get the "Jam in the Rear Door" message. When they open the rear door, find not paper (even pull out the fuser), and close the rear door, they get the "Jam in the Front Door" message. This cycle will continue

Placing both engagement tabs in the "Correct" position solves the problem and allows the print job to continue.for as long as the customer is willing to keep checking.

there is a jam sensor stuck or a small piece of paper caught, did you look in the back door.