The first place to start is the input tray that is being used to print from.
Remove all paper and check for any damaged pages.
Bent corners folded under causing the stack to be uneven will most likely cause a skewing or false jam as it cannot pick the paper out of the tray.
Next check the paper pickup/feed rollers, they last quite awhile and can be swapped from another tray for testing purposes.
The 9000 supports many different sizes of media.
The tray guides can adjust to print almost any size in the custom setting.
Having these guides set to the exact size is important, even when printing standard sizes of media.
13.
12 jam in duplex error: Opening the left door you find a jam in the duplex, slightly skewed.
With further testing, using the built in diagnostics "paper path test" you find it only jams from tray 4.
Trays 2 and 3 work just fine so now you know the duplex is not the problem.
Checking the tray 4 guides it appears they are set for the correct size.
Remove the paper from tray 4 and move the front to back guides several times.
This will reset the guides to the correct position and prevent the paper from skewing and jamming from tray 4.
Another very common error is the 13.
20 jam indication.
Either a false jam (no paper in the printer), or a real jam with pages jammed throughout the printer.
Printing an error log will be helpful in diagnosing what the cause might be.
The event log might show some other jam indications that will be useful in helping to troubleshoot the problem.
The high voltage power supply contacts on the HP 9000, labeled TB1009 and TB1010 can give false 13.
20 false jam errors.
These contacts monitor the pressure roller bias connections between the fuser and the high voltage power supply.
These connections are routed through the fuser connectors and complete the fuser wrapping detection circuit.
The wrapping jam detection circuit is an arm on a solenoid that contacts the fuser pressure roller when this check is performed.
The printer will then compare the reading to the required value for any differences.
If the value is out of the operating range a paper wrapping jam will be reported.
If this error is displayed with no paper wrapped around the pressure roller then check the contacts and springs under the high voltage power supply.
There is another contributor to the false 13.
20 paper jam error.
It might appear during or right after the power-up sequence before any pages have printed.
Of course broken or stuck paper sensor flags can contribute to this error as well.
So a visual inspection would also be helpful.
Older versions of the DC controller had a very narrow tolerance for the measurement of the conductive coatings on the fuser rollers.
That's why this often comes up after replacing or installing a fuser, leading you to think the fuser is bad!! There will be natural variances in the conductivity of these rollers which put some fusers outside the operating parameters.
The problem was corrected with later versions of the DC controller.
Print a configuration page and check the "printer number"(a two-digit code ranging from 15 to 1C).
If the second character is a number (5-9), the printer has an older DC controller which will be more prone to false 13.
20 false jam errors.
The newer or revised DC controllers will have a letter for the second digit, such as A, B or C.
Remove all paper and check for any damaged pages.
Bent corners folded under causing the stack to be uneven will most likely cause a skewing or false jam as it cannot pick the paper out of the tray.
Next check the paper pickup/feed rollers, they last quite awhile and can be swapped from another tray for testing purposes.
The 9000 supports many different sizes of media.
The tray guides can adjust to print almost any size in the custom setting.
Having these guides set to the exact size is important, even when printing standard sizes of media.
13.
12 jam in duplex error: Opening the left door you find a jam in the duplex, slightly skewed.
With further testing, using the built in diagnostics "paper path test" you find it only jams from tray 4.
Trays 2 and 3 work just fine so now you know the duplex is not the problem.
Checking the tray 4 guides it appears they are set for the correct size.
Remove the paper from tray 4 and move the front to back guides several times.
This will reset the guides to the correct position and prevent the paper from skewing and jamming from tray 4.
Another very common error is the 13.
20 jam indication.
Either a false jam (no paper in the printer), or a real jam with pages jammed throughout the printer.
Printing an error log will be helpful in diagnosing what the cause might be.
The event log might show some other jam indications that will be useful in helping to troubleshoot the problem.
The high voltage power supply contacts on the HP 9000, labeled TB1009 and TB1010 can give false 13.
20 false jam errors.
These contacts monitor the pressure roller bias connections between the fuser and the high voltage power supply.
These connections are routed through the fuser connectors and complete the fuser wrapping detection circuit.
The wrapping jam detection circuit is an arm on a solenoid that contacts the fuser pressure roller when this check is performed.
The printer will then compare the reading to the required value for any differences.
If the value is out of the operating range a paper wrapping jam will be reported.
If this error is displayed with no paper wrapped around the pressure roller then check the contacts and springs under the high voltage power supply.
There is another contributor to the false 13.
20 paper jam error.
It might appear during or right after the power-up sequence before any pages have printed.
Of course broken or stuck paper sensor flags can contribute to this error as well.
So a visual inspection would also be helpful.
Older versions of the DC controller had a very narrow tolerance for the measurement of the conductive coatings on the fuser rollers.
That's why this often comes up after replacing or installing a fuser, leading you to think the fuser is bad!! There will be natural variances in the conductivity of these rollers which put some fusers outside the operating parameters.
The problem was corrected with later versions of the DC controller.
Print a configuration page and check the "printer number"(a two-digit code ranging from 15 to 1C).
If the second character is a number (5-9), the printer has an older DC controller which will be more prone to false 13.
20 false jam errors.
The newer or revised DC controllers will have a letter for the second digit, such as A, B or C.