HP LaserJet 4

How to Identify and Fix Common Problems ?

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

Turn on the printer

Connect the power cord between the printer and a grounded AC outlet. Move the power switch on the lower-right bottom of the printer into the On position, and then press and release the On/off button on the front of the printer.

Faulty power cords and connections are an uncommon but possible cause of a printer not turning on. Before suspecting a cord failure, ensure that there is power to the wall outlet and there are no conditions preventing the printer from turning on. Testing by substitution can confirm if a cord connection is the problem.
Press the Power button to turn on the printer. Wait for 60 seconds before continuing.
Printer sleep mode

Check that the printer does not have sleep mode enabled: Go to Control Panel > Devices and Printers. Right-click the printer in question, then select Printer Preferences. Look for an option to disable sleep or time-out mode.

A component found in electrostatic printers, laser printers, and xerographic printers and photocopiers. The fuser unit is used to permanently bond toner to a substrate by applying heat and pressure. A fuser unit is made up of two rollers; one to apply heat and one to apply pressure.
From the control panel go to : setup menu>printer maintenance and then select either cold reset or factory reset.
A blinking Power light might indicate a `Fatal Error,” that requires a printer reset. Follow these steps to reset the printer. Without turning off the printer, disconnect the power cord from the rear of the printer. Wait 30 seconds, and then reconnect the power cord to the rear of the printer.
You must press the power button to turn the printer back on.
This is due to the energy saving setting in the HP printer configuration, Auto Off after sleep. This setting must be disabled when there is any USB device connected to the printer, otherwise it wakes the printer from sleep mode after few minutes.
The printer could be dirty. Solution: Arrange to have your printer cleaned. The toner cartridge may be nearly empty. Solution: Replace the toner cartridge.
The printer could be dirty. Solution: Arrange to have your printer cleaned. The toner cartridge may be nearly empty. Solution: Replace the toner cartridge.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

LaserJet 4 won't Power Up
ANSWER : I haven’t seen that particular behavior on that model. It either works or it doesn’t. My first choice would be the power supply.

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HP LaserJet 4

hp 8600 pro when power on, paper jam message appear but there is no paper jam in the tray
ANSWER : Hp 8180 Photosmart All In One code keeps says paper jam and carriage jam when neither are jammed. I followed all the recommended things to do. I live in Raleigh NC any place to take this or any suggestion.

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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 psc 2110 all-in-one won't turn on after power o
ANSWER : left the printer on now i cant get the printer to go on

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HP LaserJet 4

Paper Mismatch Error on HP C6150, C6180 or C7280
ANSWER : Thanks a lot for your informational post. I had been working online and making money through paypal generator if you also want to know the secrets behind what you can do with this free paypal money adder visit the website and take away cash in your account.

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HP LaserJet 4

HP Officejet 5610 power error
ANSWER : Please help me to fix my hp 5610 all in one the problem error 0xd0620230 reset power

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HP LaserJet 4

HP Laserjet 4 Plus LED display dim
ANSWER : My HP Laserjet Plus’s LED display went blank around 6 weeks ago. It had been acting strangely for about a month, when ready, instead of the usual 00 READY it would display 000READY, which got my attention. Well, it suddenly went entirely AWOL. The service manual said to check:

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HP LaserJet 4

HP Laserjet 6MP wont feed paper
ANSWER : I had a similar paper pickup problem on laserjet 6mp. The printer would go through start-up sequence fine but when it received a print job you could here the main gears/rollers turning but no clicking from paper pickup solenoid, then eventually error lights would come one . I incorrectly assumed it was an error with the paper pickup mechanism and wasted a whole day taking the printer apart and replacing the paper pick mechanism. Long story short, if I had bothered to figure out the secondary error light codes from the start, I would have realized it was just a bad fuser and would not have wasted so much time.

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HP LaserJet 4