HP 4 Plus Manual

I/O Buffering (HP LaserJet 4 Plus and 5 only)
I/O buffering allows the user to allocate printer memory to hold
the job while it prints, freeing up the host system sooner, like a
print spooler. The standard printer has approximately 10 KBytes
of memory allocated to I/O buffering and an additional 100
KBytes of memory is assigned to I/O buffering for each 1 MByte
of memory added to the printer.
If the printer has a minimum of 6 MBytes of memory installed
(12 MBytes of memory for a printer with a duplex...

EconoMode (HP LaserJet 4 Plus and 5 only)
The EconoMode setting uses approximately 50% less toner than
standard mode printing by reducing dot density. EconoMode,
which can also be thought of as “draft mode, ” is user selectable
via a front panel key, a Printer Job Language (PJL) sequence
using HP Explorer ’s Remote Control Panel or through application
software. The default setting is OFF.
 EconoMode, Medium Density
 Normal Mode, Medium Density
Note EconoMode does not affect print speed or memory
usage....

Memory Enhancement technology (MEt)
(HP LaserJet 4 Plus and 5 only)
HP Memory Enhancement technology (MEt) effectively doubles
the printer’s standard memory through a variety of font and data
compression methods. MEt also automatically compresses fonts
for desktop publishing applications.
When printing graphics, MEt analyzes each page as it is being
printed and automatically applies a variety of methods to print
the complete page at the correct resolution. Two of these
methods, Image Adapt and Page...

Network Security
The HP LaserJet 4 Plus and 5 printers allow the System
Administrator to lock out other user’s ability to change most
printer control panel settings. This is done by setting a password
and turning LOCK  on. The message  MENU LOCKED will appear when
a user tries to  change the printer control panel settings. 
Note If you forget your password, you can perform a
“
Cold Reset ” by holding down the  [On Line] key (Go
on LJ 5) while turning the printer on.
There are four ways to implement...

5Under the Extras menu, select Set Printer Password. On
the Printer Security screen, enter the new password  (numeric
values can be set from 0 to 65535), and click on the  OK button.
HP JetAdmin Utility (Novell Networks)
1Run JETADMIN.
2Select the printer you want to configure.  It is listed under its
“ JetDirect Interface Name ” which appears on the self test
page/configuration plot.
3Select  Configuration... .  The Printer I/O Configuration
screen appears. 
4Select  Advance... . The Advance Settings...

Service Mode
(Refer to Appendix B for LaserJet 5 information.)
The Service Mode should be used only by authorized service
personnel. The following can be executed while in the Service
Mode:
•Print a Service Mode Self Test.
•Verify the Page Count, (the page count also is displayed on the
standard self test).
•Set the Page Count.
•Set the Cold Reset Default (This sets the factory default paper
size.  Use when replacing non-U.S. Formatters).
•Set the Diagnostic Functions  ON or OFF  (for software
developers...

Setting the Page Count  
The page count is stored in the printer’s Non-Volatile Memory
(NVRAM). If it is necessary to replace the Formatter PCA, the
page count should be reset to the printer’ s original page count to
reflect the age of the print engine. Use the following procedure to
set the page count:
1Enter the Service Mode as described previously. 
2When  SERVICE MODE  is displayed, press the  [MENU] key to
access the Service Menu. Press the  [ITEM] key to step through
the menu.
3PAGES=XXXXXX  is...

Setting the Cold Reset Default   
The default paper size outside of the U.S. is typically A4.
Therefore, when replacing Formatters where the desired default
is A4, the Customization Variable must be set to A4. This
prevents the Cold Reset procedure from resetting the paper size
to Letter. To set the Customization Variable:
1Enter the Service Mode as described previously.
2Press the [Menu] key to display  SERVICE MENU.
3Press the [Item] key to display  CR PAPER=LE\f\fER
4Press the [+/-] key to toggle...

Cold Reset  
The Cold Reset feature of the printers allows the printer to be
returned instantly to the factory default configuration settings.
This feature is valuable because the the Dynamic I/O and PJL
features of the printer enable any user connected to any I/O to
access and change the default configuration as applications
require. When setting up the printer in a new location, or when
troubleshooting printer problems, always perform the Cold Reset
before entering the selected user defaults. A Cold...

Understanding the PCL Self Test
Printout   
(Refer to Appendix B for LaserJet 5 information.)
ItemFigure3-3Explanation
1 Standard Menu Selections: Shows standard menu selections, such as Printing Menu and PCL Menu, and menu items, such as Copies and MP tray,
in the order they appear in the control panel display.
2 Optional Menus: Shows optional menu selections, such as the PostScript Menu and MIO Menu, and menu items, such as  PRT PS ERRS, in the order
they appear in the control panel display. An...