EN Diagnostics mode 59
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Diagnostics mode
This section provides an overview of the diagnostic tools incorporated
into the HP Color LaserJet 4500 series and 4550 series printers.
CAUTION
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.
Note
In the 4550 series, you can abort a test run by pressing the [CANCEL
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 JOB] 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 [ITEM] key
to see the different log messages, and the [-V
ALUE+] key to scroll the
message back and forth.
Accessing diagnostics
• To access the diagnostics mode, hold down the left side of the ITEM
key and turn on the printer.
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