HP LaserJet 4

How to Identify and Fix Common Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

The LaserJet M4345 MFP or 4345 MFP is unable to copy or scan because either the message “Initializing Scanner” is displayed or the LED below the START button is illuminated amber. Normal printing may work just fine. These errors indicate that data from the scanner`s Optical Unit is not being sent to the Formatter PCA.
HP 4345 M4345 Laser Printer Cold Reset

To perform a cold reset: Turn the MFP off and then power back on. When the memory count appears on the printer control panel display, Select and hold 6 until all three LEDs flash once and then stay on. This might take up to 20 seconds.

Unplug the power cord from the wall outlet. Wait at least 60 seconds. Plug the power cord back into the wall outlet. Reconnect the power cord to the printer.
If you encounter your HP Printer stuck on initializing, perform a hard reset, bypass the initializing phase, and power drain the printer motherboard. If the issue persists, cold reset the printer to restore factory default settings and update the firmware.
Turn the printer off then back on. If the issue persists, turn the printer off, unplug the power cord and then wait at least three minutes before plugging the power cord back in and turning the printer back on. If the issue persists, ensure the product is running the latest firmware available from HP.com.
Initialization is done to delete the data and settings saved in this machine and restore the machine to its initial settings.
Make sure that the printer is turned on. Press and hold the RESUME/CANCEL button then release the button when the POWER lamp flashes 15 times. All the printer settings are initialized.
Is there something wrong with my product? The first time a ink cartridge is installed in the printer, it will take 7-9 minutes to charge the ink system and initialize the printer. While the ink is charging the power light will flash. NEVER turn off the printer while the power light is flashing.
A factory reset will return your printer`s settings to what they were when it first came out of the box. This guide will help you reset your printer back to factory defaults.
Initialization is done to delete the data and settings saved in this machine and restore the machine to its initial settings.
Normally a 30.01 error is a paper jam in the document feeder. Id check the ADF sensors and look for anything that could be causing a false alarm by the printer. and here: /t5/Multifunction-and-All-in-One/HP-CLJ-CM4730-MFP-30-01-34-scanner-failure/td-p/5963917#.

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HP LaserJet M3035xs MFP has a question mark and is
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HP LaserJet 4

evenly spaced horizontal lines on hp laserjet III printout
ANSWER : The lines would be a toner cartridge problem. Which paper tray? The MF tray or the optional paper cassette?

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HP LaserJet 4

HP laser jet 3015 "Upgrade Error Call HP Support"
ANSWER : rgtr

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HP LaserJet 4

HP Laserjet M3035xs RFU Upgrade
ANSWER : There’s no way.

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HP LaserJet 4

HP 9040 MFP Error code
ANSWER : bonsoir

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HP LaserJet 4

HP Laserjet 4200 50.2 Fuser error
ANSWER : if you are using a good fuser the next part to try would be low voltage power supply

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HP LaserJet 4

HP Laserjet 4250 – RFU LOAD ERROR
ANSWER : Italiano:

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HP LaserJet 4

How to copy a card slot in HP laserjet 4250N
ANSWER : None that I know of, using a computer is likely your best option but I never attempted it.

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HP LaserJet 4