ErrorCodeDoctor
HP · Printer (LaserJet)

HP Printer (LaserJet) Er/77 error code

Difficulty: Hard · Cost: $0–$200 · Duration: 2m

The Er/77 error means your HP LaserJet printer detected a secure device failure — a fault in the printer's security hardware or firmware. Turn the printer off wait 30 seconds and turn it back on. If the error persists contact a qualified technician.

Common causes

  • Security hardware or firmware fault detected in the printer

How to fix it

  1. 1

    Turn off the printer

  2. 2

    Wait 30 seconds

  3. 3

    Turn the printer back on and check if the error has cleared

  4. 4

    If Er/77 persists contact a qualified technician

Related HP Printer (LaserJet) error codes

1

Er/01

The input tray is empty — no paper loaded

easy
2

Er/02

The cartridge access door is open

easy
3

Er/03

The printer failed to pick a sheet of paper from the tray

easy
4

Er/04 / Er/05 / Er/06

A paper jam was detected inside the printer

easy

Er/77 error — frequently asked questions

What does the Er/77 error mean on a HP printer (laserjet)?

A secure device failure was detected

What causes the Er/77 error?

The Er/77 error is usually caused by: Security hardware or firmware fault detected in the printer.

Can I fix the Er/77 error myself?

This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.

How much does it cost to fix the Er/77 error?

Fixing the Er/77 error on a HP printer (laserjet) typically costs $0–$200, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my printer (laserjet) with the Er/77 error?

We'd recommend addressing the Er/77 error before continuing to use the printer (laserjet), since hard-rated issues often involve a real fault rather than a minor glitch.