HP color laserjet 4500 Manuale Utente

EN

Diagnostics mode

This section provides an overview of the diagnostic tools incorporated 
into the HP Color LaserJet 4500 series and 4550 series printers. 

Use caution when performing printer diagnostics to avoid risk of injury. 
Only trained service personnel should access the diagnostic mode 
with the skins removed.

There are two diagnostic sections built into the firmware, one for the 
formatter and the other for the engine. Each section contains different 
tests that allow the service technician to verify printer functionality. 
While in diagnostic mode there are no error messages associated with 
these tests. Therefore, determination of the problem will rely on the 
technicians skill. To exit diagnostic mode, turn the printer off.

In the 4550 series, you can abort a test run by pressing the 

[C

ANCEL

 

J

OB

]

 key and holding it down until the display shows the menu again. 

In some cases, it will take several seconds. To cancel the NVRAM 
test while it is running, press the 

[C

ANCEL

 J

OB

] 

key and hold it down 

until the display show the menu again. NVRAM is put back in its 
original form, and an error is logged in the Fault log.

When the Attention LED is on, then there ahs been an error in the 
test. Press the 

[M

ENU

] 

key to get to the Fault log menu, the 

[I

TEM

]

 

key 

to see the different log messages, and the 

[-V

ALUE

+] 

key to scroll the 

message back and forth.

•

To access the diagnostics mode, hold down the left side of the 

 

key and turn on the printer.