Service Mode (LaserJet 4ML/4P/4MP)
The Service Mode should be used only by authorized service
personnel. While in Service Mode, you can:
Print a Service Mode Self Test.
Verify and set the Page Count (the page count also is displayed
on the standard self test).
Set the Cold Reset Default. (This sets the factory default paper
size to either Letter or A4).
Set the Demo Page=True/False. Used to remove the Demo Page
option from the self test menu.
Set the Diamostic Functions ON or OFF (for software
developers &e only).
LaserJet 4ML
Since the HP LaserJet 4ML does not have a front control panel,
Service Mode is accessible only through software (PJL commands).
See “PJL Software Commands” later in this Chapter.
LaserJet 4P/4MP
The following procedure is used to initiate the Service Mode (refer
to Figure 3-5).
1.
2.
Hold down the -, ~, and m keys while
powering ON the printer, until all lights are illuminated and
the Display Window is blank. (If the Display Window reads
.
. .. .
,,.,-.: :::ci c ,,,.:..,.,
.,”...... .......,.,., ,,..._:,
at this point, the keys were released too soon.
Repeat this step until successful.)
Click the ~ key, then the - key. The message
,...,,...,..,,,.,.......
.
:..,@.:.,,,,
.,.,,,,.,.,,.,,.,-.~.
w..u?:is displayed briefly, then the printer
automatically begins a ;j~ ~E!...F:W:!. After several seconds,
-... ..
both Control Panel Indicators turn OFF. (The printer may
display ‘~? :R%w~i.
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