HP color laserjet 2550 series Manuale Di Servizio

Service mode functions that appear in this section should be performed by trained service
personnel.

A cold reset sets most, but not all, default variables stored in NVRAM back to factory default
values. It typically does not reset the page count, paper tray sizes, localization language, or
formatter number. To reset all variables, see 

1. Turn the printer off.

2. Press and hold   (Go).
3. Turn the printer on and continue to hold   (Go) for at least 10 seconds, but for fewer

than 20 seconds.

The Attention light turns on during a cold reset.

4. Release   (Go).

If either the Go or Ready light turned off or no lights turned off before releasing 

 (Go),

then repeat steps 1 through 5.

5. The printer lights begin cycling from front to back. The cold-reset process runs until the

printer is in the Ready state.

NVRAM initializer sets all default variables stored in NVRAM back to factory default values
or to a default ROM value, depending on the variable. It also performs a system reset.

NVRAM initializer resets the following:

●

All menu settings to factory default values

●

Factory settings such as formatter number, page counts, and factory paper settings

Jetdirect NVRAM is not reset by performing an NVRAM initialization.

If possible, print a Configuration page before performing an NVRAM initialization. The
Configuration page contains the information needed to restore the printer data.

1. Turn the printer off.

2. Press and hold   (Go).

ENWW

Service mode functions