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CP2025, Hewlett Packard Color Laser Jet Pro M451 series printer

PROBLEM; “Cleaning followed by MisPrint” issue on the HP pro 400 – M451 and CP2025 Series Color Printers

A very common problem with both the Color Pro 400 series and the CP 2025 series printers.  When sending a print job it will begin to print. Then you will see that the printer has gone into “cleaning mode” followed by “Misprint”. Then it will ask the user to press “OK”. Then if you select ok, it will try to re-print the job but “Cleaning mode” will begin and the whole process will start all over again. I can see the frustration in your eyes and I’m not even there. If you pull out the paper tray carefully you will see that the paper has fed in just a bit and is laying inside. Not to worry there are a few solutions besides replacing the machine that seem to help.

The easiest way to get yourself printing again is to slow down the machine. I will explain the reason why this works later in my article. Go into the paper handling menu and set Tray 2 paper type to “Heavy – 111-130g”.
The reason why I don’t like this method is because it slows down your printer. The M451dn prints Letter size color pages at 21 pages per minute (ppm). If you are doing a large print job you will notice a drop in speed.

For your information, Hewlett Packard will replace the machine on exchange if it is still on Warranty.  If it is off of warranty you will have to pay to exchange it or you can try the fix here.

What is Actually Happening?
Everything that happens in a laser printer is timed to the millisecond. The image on the ITB “Intermediate Transfer Belt”, the position of the paper as it is being sent on its way through the machine and the timing of the laser are just a few of the many necessary events in the operation of a laser printer.
As the paper is being sent to the registration assembly the image is being created on the ITB. In this situation the paper never makes it to the Registration sensor (SR4). (Note: Misprint means paper jam)
Now, because that image is unusable the machine begins to clean the ITB which is the “Cleaning Mode”.
Then it will say “Misprint” and waits for the user to press “OK”. If you press “OK” the page that failed is reprinted. Then it will start the dreaded Loop of destiny.

The next solution is to replace the paper feed pick-up roller. It could be as simple as the roller is worn out and slipping. Rollers in a printer are similar to the tires on your car. If they are slick to can’t get traction, in the same way the roller can’t get the traction it needs to push the paper as much as it needs to go.

Sensor SR4 Registration
M451dn Sensor SR4 Registration

The problem is that the Paper Feed Pick-Up Roller does not push the paper far enough into the registration assembly. So how do we increase the amount/distance that this roller travels?  In this modification that I tried and have had 100% success with, we will increase the diameter of the roller. It is very similar to an adjustment that many copiers have. It is called the “Paper Feed Buckle” adjustment.  Here is an example of two different amounts of buckle as the paper is being fed into the registration rollers.

Paper Buckle Amount
Paper Buckle Amount
Paper Buckle Amount Increased
Paper Buckle Amount Increased

This would be great if that was all there was to it.  But I have had many that even though I replaced the roller it still had the problem.  That is why I had to come up with a fix or replace dozens of printers.  The following is how I increased the buckle amount by increasing the diameter of the roller.  I would love to hear from any people that had to perform my modification and how it turned out.
Drop me a line at izzykilman@gmail.com

Roller Modification
P/N
RM1-4426  Paper Pick-Up Roller
P/NRM1-4840  Separation Roller  (Change this roller at the same time).

IMG_0443
Feed Roller Modification: P/N  RM1-4426

IMG_0445
 Cut 6 strips of electric tape 85MM long.

IMG_0446
Stack them 1 at a time until you have all six
stuck together.  

IMG_0447
Trim off approximately 14MM doesn’t have to
be perfect.

Pull off the paper feed roller’s rubber only so that the half moon is showing. If you take it all the way off you may get the tread on backwards plus it’s easier not to.  Install the tape so that it covers the entire half-moon end to end.

Reinstall the rubber of the feed roller making sure it is straight and on correctly.
Compare rollers
Now compare the height of the rubber tread.  We have increased the diameter of the feed roller so that when it feeds the paper will travel further into the registration assembly and prevent the issues with cleaning/Misprint.

Note: If the roller is already worn out this wont work.

Reinstall the roller into the printer.

Error Codes, Hewlett Packard Color Laser Jet Pro M451 series printer

Hewlett Packard M451 color Printer Error Codes

Event log messages The event log is located on the configuration page (labeled Status Log) and lists the last five events.

Event-log messages         Error log code Description

10.0000 Black e-label error
10.0001 Cyan e-label error
10.0002 Magenta e-label error
10.0003 Yellow e-label error
10.1000 Black e-label missing
10.1001 Cyan e-label missing
10.1002 Magenta e-label missing
10.1003 Yellow e-label missing
10.3000 Non-HP black
10.3001 Non-HP cyan
10.3002 Non-HP magenta
10.3003 Non-HP yellow
13.0000 Paper jam, Tray 1 area
13.0001 Paper jam, Tray 2 area
13.0003 Paper jam, registration drum area
13.0004 Paper jam, drum fuser area
13.0005 Paper jam, fuser output area
20.0000 Memory out
21.0000 Video under run
50.1000 Low temperature fuser error
50.2000 Slow fuser error
50.3000 High temperature fuser error
50.4000 Fuser heater wire failure
50.5000 Fuser low temperature subtherm failure
50.6000 Fuser high temperature subtherm failure
52.0000 Scanner error, black laser failure
52.0100 Scanner error, cyan laser failure
52.0200 Scanner error, magenta laser failure
52.0300 Scanner error, yellow laser failure
54.0600 Density sensor error
54.1000 Color plane registration sensor error
54.2800 Sensor density contaminated
54.2801 Sensor color plane registration contaminated
55.0000 Engine comm fatal error
55.0001 Engine comm critical error
55.1000 DC controller memory error
57.02     Fan Error The product has experienced a problem with its internal fan.
59.0000 ITB rotation failure
59.0001 ITB ramp up failure
101.0000 Color-plane registration error
102.0000 DMAX calibration error
103.0000 DHALF calibration error

Hewlett Packard Color Laser Jet Pro M451 series printer, Quality Issues

Color Alignment Problems on a LaserJet M451dn printer

 

Color Alignment Problems
LASERJET PRO 300 COLOR, LASERJET PRO 400 COLOR/CP2020 Series Printers

If you print a supplies status page, under printers control panel menu reports, you can check alignment. Note the shift on the Magenta Cartridge display. It is not aligned with the toner symbol (Rack of Cue Balls) the customer will experience blurry print jobs and image offset.

Supply Status Page with Magenta not aligned correctly.

IMG_0558
Note: Cartridges install dates and if the issue started to happen after a specific toner replacement. The new toner may be causing this issue.

Assuming you are using HP original toners please try to reboot unit without consumables and when printer asks for them re-install them one by one.

Perform 1 or 2 full color calibrations if needed and check if issue persists by printing Supply Status report.

Check for 54.xx errors under event log entries section that would confirm the Color plane registration issue.

If issue persists you should check and clean the color misregistration sensor assembly.

You may also perform an NVRAM init reset. (Warning: This will erase Network settings… Print all configuration pages before you do this)

If issue persists Replace the following components starting with the ITB…

a.) Intermediate transfer belt (ITB) RM1-4852. Both M451 and CP2025 series
Note: The ITB was the problem I recently had with the sample above. Why it only affected the magenta I don’t know.

PRO 300 PRO 400 Series b.) Color misregistration sensor assembly P/N RM1-8029

CP2020 Series b.) Color misregistration sensor assembly P/N RM1-4850

 

Izzy