Clearing the RFU Error Message in an HP 4250/4350 Printer


  1. Turn the printer off.
  2. Power on the printer and as soon as you see the memory count hold the stop button down until all three control panel lights flash once and then remain on.
  3. Press the select button (green check mark) and then the menu button.
    HP4250selectbutton
  4. Menu arrow down until you see “Clear All RFU Errors”.
  5. Press the select button twice until the highlighted cursor is the letter C in the word clear.
  6. Scroll down until you see “Set Run mode to Manual”.
  7. Press the select button once until the highlighted cursor is on the letter R in the word Run mode.
  8. Scroll down until you see “Set RFU Error Off”.
  9. Press the select button twice until the highlighted cursor is on the letter S in the word Set.
  10. Turn the printer off and then back on.
  11. Wait until the printer comes to ready and resend firmware.

HP LaserJet 4200, 4240, 4250, 4300, 4350, and 4345 Series Fuser Problems


By far the most troublesome part of these HP machines is the fuser and swing plate assembly. Due to the increased print speed of these models and the heavy usage the printers handle, the fuser and surrounding gears tend to receive a lot of the abuse and wear. Noise is the main issue. If you work on these machines expect to receive a lot of calls related to noise and jam issues in the rear of the machine. Mainly in this article I will focus on noise issues but I’ll also take a look at other problems related to the fuser.  Continue Reading

HP LaserJet 4200, 4240, 4250, 4300, 4350 Common Errors and Issues


Yet another great series of printers introduced in the 4000 line of printers by HP, these machines are the workhorses that we’ve come to expect from HP for fast every day printing. They experience very few problems and have long life spans. The majority of the problems are easily fixed and at a relatively low cost to the customer making these printers a favorite in any work environment.

In this article, I will discuss a few of the issues related to these machines to help make repairing them as trouble free as possible.

13.01 Paper Jam Error
Not the most common error but it still does occur on these printers. Obviously, the first thing to check is the feed separation rollers (part # RM1-0037)  The rollers for the 4200 and 4300 series tend to last a lot longer than original 4000 rollers but they still wear out so check to make sure they still have tread.  Continue Reading