HP Color Laser Jet CP2025, CM2320, M351, M451, M375, M475, M476 Printers.

There has been an increase in cases where the above series printers have a constant paper jamming problem in the rear door in which in most instances escalates to a service call to have a technician first replace the pick up and separation rollers – to no avail.

The symptom is that the printer will reach the ready state – start to process the print job – initiate pick up – pull the page about 3 inches into the paper path up to the transfer belt and then display “jam in rear door”. (Shown in image below with rear door open)

The cause for this paper jam is that the transfer belt is not rotating within the printer.

The cause for the belt not rotating is a broken gear on the Main Drive Assembly. The circled gear is supposed to have 6 teeth (shown below with belt removed) that extend out to drive the transfer belt but in these cases the teeth shear off to a smooth surface and at that point require the Main Drive Assembly (MDA) to be replaced.

The service manuals for these models do not list a part # for the MDA as the value of the printer is not worth the 2-3 hour repair time to change it and for most cases the printer is replaced.

However it is available through Laser Pros International via part #:
CM2320-GT-R for models CP2025 and CM2320
M475-GT-R for models M351, M451, M375, M475, M476.

This Printer Tech Tip is contributed by LaserPros (www.laserpros.com). Email any questions to marketing@laserpros.com