Question about HP LaserJet 4250n Printer

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No display and no light indicators when powered on

Pls can you advice me on my HP LASERJET 4250n printer. It shows BLANK on the display panel not lights come on. The fans start up and the fuser unit initializes fine

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  • Anonymous Mar 20, 2014

    originally power control panel said ready but nothing happened when I pushed any start buttons, now it powers up but the control panel is blank

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If the printer control panel is blank when you turn on the printer, check the following items.
1. Make sure that the printer is plugged into an active electrical outlet that delivers the correct
voltage.
2. Make sure that the on/off switch is in the on position.
3. Make sure that the fan runs briefly, which indicates that the power supply is operational.
4. Make sure that the control panel display wire-harness is connected.
The control-panel wire-harness connector can easily be disconnected when you install the top
cover. If the control panel does not work after the top cover is installed, verify that the wire-harness
connector is fully seated into its DC controller PCA connector.
5. Make sure that the firmware DIMM and the formatter are seated and operating properly.
6. Remove any HP Jetdirect or other EIO cards, and then try to turn the printer on again.
If the printer control-panel display is blank, but the main cooling fan runs briefly after the printer
power is turned on, try printing an engine test page to determine whether the problem is with the
control-panel display, formatter, or other printer components.
Engine test page
To verify that the printer engine (all printer components except the formatter, formatter DIMMs,
EIO products, and the stacker or stapler/stacker) is functioning, print an engine test page. Use a
small, non-metallic, pointed object to depress the test-page switch, which is located on the right
side of the printer
The test page should have a series of vertical lines. The test page will print from the last tray you
printed from. However, if the printer has been turned off and then back on since the most recent
print job, the page will print from tray 2. The printer will continuously print test pages as long as
the test-page switch is depressed. The printer will not print a test page if it is in PowerSave
mode.
A damaged formatter might interfere with the engine test. If the engine test page does not print,
try removing the formatter and performing the engine test again. If the engine test is then
successful, the problem is almost certainly with the control panel, or the cable that
connects it.
Hope this helps

Posted on May 24, 2008

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1 Answer

How to reset fuser unit in printer hp laserjet 4250


turn the printer off for at least 20 minutes, then cycle power. If the 50.2 fuser error occurs again, you may need to replace the entire fuser assembly OR you will need to replace the power supply.

Dec 24, 2012 | HP LaserJet 4250n Printer

1 Answer

My HP laser jet 4250n printer turns on but the display screen is blank --there is no message. the ready light, data light and attention light all come on


Could be bad Control Panel or bad Formatter.Start with the Control Panel, it's cheaper.1st make sure the cable is attached to it.

Sep 29, 2011 | HP LaserJet 4250n Printer

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Our HP 4250N Laser Printer is leaving a black line approx 2 inches off left side of paper. Tried cleaning rollers and putting printer into clean mode. Nothing is working. Any advice? Thank you.


This is caused either by the fuser or the tonercartridge.

The most common cause is the tonercartridge.
You can test this by forcing a paperjam to stop the paper just after the toner but before the fuser.

To force a paper jam print you can print a page from the manual feed tray and as the last third of the page enters the printer opening the door causes it to halt.

If the black line is there before the toner is bonded to the paper by the fuser you should replace the tonercartridge..

Jan 04, 2011 | HP LaserJet 4250n Printer

1 Answer

Sir, We have a hp laserjet 4250n printer since


Replace the fuser unit (they last about 75K pages in my experience)

1. Power down the printer and unplug it
2. Remove the fuser from the back side of the printer
3. Replace the fuser unit with a new one
4. Turn the printer back on

Dec 24, 2009 | HP LaserJet 4250n Printer

1 Answer

Our laserjet 4250n printer is making a awful noise when we try to print. Can you please help?


This series of printer has an inherent fault with what they call the Fuser Swing Plate. It's a small metal plate that contains a couple of cogs, one of which drives the fuser assembly. HP found that the fuser drive cog on his plate encountered excessive wear and would then cause a sometimes, quite loud whirring noise from the back of the printer.The only way to get around this is to have another, new, updated Fuser Swing Plate fitted to the printer.

Oct 08, 2009 | HP LaserJet 4250n Printer

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50.4 FUSER ERROR ON HP LASERJET 4250n


I am willing to bet that you may have a faulty thermistor in your fuser asssembly, I wouldn't bother replacing the thermistor, your best bet is to just replace the fuser assembly and this should resolve your issue, so replace the fuser or call someone to do it for you. This should resolve your issue.

Mar 31, 2009 | HP LaserJet 4250n Printer

1 Answer

HP 4250 laserjet will not go through the start up sequence.


Well first do what joe said about checking the Plug on the Display, <Here's another solution did you also check the cables( Power Cables going to the format bd ? Sometimes you can bent those pins easily, I have seen it and ok I done it once on HP 4 plus when i first started out as a tech ? Check that ? May I asked What was the reason for replacing the Formatter board in the first Place ? were you getting an error ?


Mar 19, 2009 | HP LaserJet 4250n Printer

1 Answer

Printer problem


First remove the control panel from the machine and make sure that the cable is seated well to the panel and the control board. If they are remove both cable ends and reseat them.

May 21, 2008 | HP LaserJet 4250n Printer

1 Answer

Blank display


If the printer control panel is blank when you turn on the printer, check the following items.
1 Make sure that the printer is plugged into an active electrical outlet receptacle that delivers the
correct voltage.
2 Make sure that the on/off switch is in the on position.
3 Make sure that the fan runs briefly, which indicates that the power supply is operational.
4 Make sure that the control-panel display wire-harness is connected. See the hint in the
procedure for Top cover.
5 Remove any HP Jetdirect or other EIO cards, and then try to turn the printer on again

Apr 04, 2008 | HP LaserJet 4250n Printer

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