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Most HP printers of this size use one flag to signal two different problems. Both paper jam and toner cartridge inserted. Look on the left side of the cavity where the cartridge is inserted and you should see a flag there that gets pressed by the cartridge. The problem usually requires removing the back panel of the printer and reseating the flag.
Turn the printer off, then on to verify error. If no error attempt to verify functionality.
If the error appears or problems persist, continue with the remaining steps.
Follow the steps directly below to unlock the Carriage from the Service Station:
Highlight the Set-Up menu and press the ENTER button.
Press the UP arrow and ENTER buttons simultaneously and press the ENTER button.
Highlight Service Utilities and press the ENTER button.
Highlight Unlock Carriage and press the ENTER button.
Unplug the power cord from the printer.
Manually move the Carriage assembly out from the Service Station area and check for obstructions (remove as needed).
NOTE: If you are unable to release the Carriage by the previous process, remove the right end-cover and locate the main Service station gear (as pictured below in Figure 1) and rotate it counter clockwise approximately four revolutions. The Carriage assembly should now be free from the Service station. Figure 1: Service Station Gear
If an obstruction is found and removed, plug the power cord in, turn the printer On and attempt to verify functionality.
If no obstruction was found or the problem persists, continue with the remaining steps.
Disconnect the power cord from the printer.
Remove the right end-cover from the printer.
Open the top cover and manually move the Carriage to the left so that it is not over the Service Station (refer to Step 3 for instructions).
The Service Station flag should be at about a 45-degree angle as pictured below in Figure 2.
Figure 2: Service Station flag correctly positioned
If the flag is correctly positioned continue with Step 16.
If the flag is not at a 45-degree angle, press in gently on the bottom of the gray and rotate the bottom of the flag to the right (toward the back of the printer) until the top of the flag clips into the tab on the Service Station. The flag should stay at about a 45-degree angle.
Plug in the power cord and turn the printer on.
If no error appears, attempt to verify functionality.
If the error reappears continue with the remaining steps.
Turn the printer off and disconnect the power cord.
NOTE: The printer firmware must be upgraded to A.02.04 or higher for the new Service Station to work. The new Service Station does not have an Aerosol fan and older firmware will check for the Aerosol fan, thus causing another system error.
Following replacement, turn the printer on and verify functionality as instructed below.
Verifying printer functionality
Turn the printer on.
Allow initialization to complete.
Load media into the printer.
From the main front-panel menu, select the Ink menu and press ENTER.
Select Troubleshooting and press ENTER.
Follow the instructions on the Front panel.
Following a successful troubleshooting print, functionality is verifie
Your machine has a problem counting the yellow ink sticks, this can be caused by
non Xerox ink or faulty/broken Xerox inks.
Your machine has now gone into a flagged fault state and needs to have the flag reset.
In order to reset the flag, you need to go into 'Troubleshooting' then into 'Service Tools'.
Once in service tools press and hold the up button, then press the down button.
This will take you into a hidden service menu.
Scroll down this menu and look for 'Clear ISC fault' or 'Reset Ink Loader' (there will only
be one or the other not both commands) highlight the command by scrolling down to it.
Press the OK button, nothing will happen. (Press a couple of times if you want to be sure).
Now scroll down to exit and select to return to the previous menu.
Switch the printer off by the off switch on the side of the printer, NOT at the wall/plug socket.
Your printer will now reboot. Please be aware, if there is a faulty switch on the ink loader,
this method will work until 2.5 inks have gone through the machine, it will then give you the fault again. If it was just a dodgy ink stick, this will be a permanent solution.
Hope it helps you.
I just had this problem and fixed it. The original toner cartridge that comes with the printer cannot be reset. You have to buy at least one new cartridge. The reason is that the original cartridge that comes with the printer doesn't have a reset flag. You can, however, refill/reset a cartridge that you buy separately. Pull out the drum and lift the cartridge out of the drum. Hold the handle and look on the left end. You should see a crescent shaped hole with a white flag/lever. To reset this, move the white flag all the way to the left (I had to use something to push it). Put it back into the printer and voila - it fixes itself. Then, after the printer has been reset, you can use the original cartridge again, if you want. The flag part won't matter once the printer has been reset. I hope this is clear. I know it worked for me, and I had the exact same problem.
Is this occurring even with no paper in the face down top bin? Likely a stuck paper sensor flag, or dirty optical sensor. You need to remove the top to access it, investigate and replace the flag or sensor, or clean the optical sensor. Service manual free at feedroller.com - look down the left navigation bar for an icon and link to service manuals. You can download the PDF free - dont make people selling copyrighted material on ebay rich.
Top cover isnt that hard to remove and requires patience and a #2 phillips screwdriver. Be careful of the cable for the display and buttons when you lift the cover off.
Limited information provided.<br />
Pressing 8 start may give you a error code. Or a 8 plus stop button.<br />
If the machine has a C4 code, this may require machine software to be installed on the machine in order to correct problems. The scanner will not operate correctly even with a new scanner. The software needs to be installed by the service representative in order to align the correct software to main board, to correct laser heas assay.<br />
Good luck.<!-- from fixya rte -->
Sounds like the Outputflag is sticking or not returning back to the proper position as quickly as i should. The output flag is gravity return in other words there is no spring required. Perhaps there is paper or dust collecting in that area and causing the flag to stick... regardless follow these instructions to test this :
The output bin flag on the 1720dn is on the right side. (as you face the printer)
Turn the printer off, hold
up the flag while pwring on, wait until al the lights stop cycling. the
only light remaining ON (flashing) should be "Remove Output". Release the Output Bin flag; the light should stop flashing (go out) and the "Ready" light
If this is the case try cleaning that area with compressed air to see if the flag will lower on its own.
In the side of the blue handle on the toner there should be a window that has a white flag inside it. the surface of the flag may be dirty and require cleaning. alternatively, there is a sensor opposite this in the side of the printer that "looks" for the white flag moving during the startup sequence that may also require cleaning. K in the code would indicate K or black toner is the one to be checking.
A flag in the output bin is activated. This flag moves up while the paper is making its way out of the printer and drops as soon as the paper drops into the output bin. When the tray is full the flag will stay activated or in the "up" position instead of down. Telling you to empty the bin.
You can see this flag in the center on the delivery assembly(where paper exits). The flag should be free to move up and down. Gently see if the flag will come loose. This flag is delicate so if you push or pull to hard you will break it.
The only other way to lease this flag would be to remove the top cover and reposition it. Of course this would be a little more involved and would require a new set of instructions.