!!
critical HP
Error Code All LEDs solid on
Fatal error - all control panel LEDs are solid on.
? What Causes This
Critical printer hardware failure or firmware error.
✓ How to Fix It
- Do not press Go button.
- Power off the printer.
- Contact HP service for repair - this is a fatal error requiring professional service.
Source: page 142 of the official manual
From the manual
This error code appears in:
HP Laserjet 1010 Printer