Question about HP LaserJet 4250n Printer

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Replacing a power supply board

Does anyone have instruction on removing and replacing the power supply board on a hp 4250.

I have a service manual for a HP 4200 but the power supply board is different on the 4250.

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Re: replacing a power supply board

The power supply assembly is quite a thing to get out. You really will need a service manual for the 4250.

Go to and see if they have one listed. If not, ask them to get it for you. They can usually find them within a few hours.

You will need to remove the following assemblies just to be able to start removing the PSU:

● Rear output bin
● Rear accessory cover and tray 2 extension door.
● Top, right-side, and left-side covers
● Fuser
● Formatter assembly

Then remove the PCA guide and the part above it
Remove the power switch arm
Disconnect the PSU cables from the DC controller
Remove the fan cover plate
Disconnect the fan and thermistor connectors
Pull the PSU cable through the frame and you are about there. A bit of wriggling and wrangling and the whole assy should come out.

Posted on Oct 16, 2007

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Are you telling the machine that paper type is letter head or envelopes, It must be done, it changes temp of fuser to suit the paper type, no it is not a power supply problem change paper type to card stock/thick/letterhead etc to suit then machine will adjust temp to suit.. ie file, print properties paper type.

50.2 fuser error replace fuser.

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