Configuration -

The Configuration of the printer consists of setting hard and soft
user defaults, and setting up the host computer to communicate
with the printer (System Configuration). For installation
instructions refer to Installation in the Getting Started Manual
that is shipped with the printer.
Hard defaults are the I/O Menu and Configuration Menu
settings. These are set when the printer is installed and remain
as configured. The soft defaults (Printing menu and PCL menu)
change with the print job requirements. System Configuration
includes installing printer drivers, MODE commands and
updating the AUTOEXEC.BAT file.
The instructions in this chapter explain how to access the printer
features through the control panel, and how to set up the printer
in different configurations. This chapter explains how to check
the configuration settings, and how to verify that a configuration
is correctly selected.
Setup and configuration information for accessories is available
in this chapter. This information is intended to augment and not
replace the information provided with the accessories themselves.
If possible, use the information provided with the accessories
when installing the accessory products.
Use the information that comes with the printer drivers when
installing the printer. Many features of the printer are not
available without the correct printer driver for the software
Configuration 3-1
Using The Control Panel
(See Appendix B for LaserJet 5 information.)
Figure 3-1
Control Panel Keys
The control panel (see Figure 3-1) consists of eight keys, three
indicator lights, and a 16-character display panel. The three
indicator lights are described in Table 3-1.
Control Panel Keys
There are two rows of control panel keys. The upper row keys
have one function each. The lower row keys have a second level of
functions which are accessed by holding down [Shift]. Note that
the alternate functions [Reset], [Continue], and [-] are coded the
same color as [Shift]. Table 3-2 details both plain key functions
and shift-key combinations.
3-2 Configuration
Table 3-1
On Line
Form Feed
Indicator Lights
Ready to print.
Processing a print job. Do not take off line or switch
Not ready; see display for message.
Ready to receive data.
Going from on line to off line.
Off line. Other keys can be accessed.
Data still in printer buffer.
Buffered data being printed.
No buffered data in printer.
Configuration 3-3
Table 3-2
Control Panel Key Functions
[On Line]
Switches the printer between ON LINE (communicating with the
computer or other data source) and OFF LINE (not communicating).
For the printer to receive data, both the On Line and Ready indicator
lights must be on.
[Form Feed]
Prints any data remaining in printer’s buffer. It cannot be used to send
a blank sheet of paper through the printer.
[MP Paper
Selects the physical paper size loaded in the MP tray only when it is
operating as a PC tray.
Saves a selection in the printer’s “permanent” memory. An asterisk (*)
appears next to the item to indicate that it is now the default. The
selection remains even if the printer is switched off or you perform a
If buffered data or temporary data (such as temporary downloaded
typefaces) are present, [Enter] only marks the items with an asterisk
(*) as the default. When you press [On Line] or [Menu], the message
10 RESET TO SAVE appears. There are three choices:
Clears page buffers
(See the following table.) Clears page buffers
[On Line]
Places the printer on line without performing a
Accesses the lower labels ( [Reset], [Continue], and [-]) on the control
panel. It works like the [Shift] key on your computer’s keyboard.
[Menu] cycles through the menu selections, returning to 00 READY at
the end of the cycle unless an error, warning, or configuration
problem is encountered. If an option such as PostScript or a different
I/O has been added, that menu appears in the menu sequence.
Continue ([Shift] + [Item]) allows the printer to resume printing after it
has been placed off line due to an error condition or a device
attendance request (such as 21 PRINT OVERRUN). The [Continue] key
clears most error messages and places the printer back on line. It
functions like the [On Line] key except:
1. Continue does not override an error condition.
2. Continue allows you to override the paper or envelope size
selection regardless of what size media is in the MP tray.
3. Continue allows you to override a request to manually feed paper or
an envelope; it will select paper from the next available source instead.
[+] or -]
[+] or [-] allows you to step (by momentarily pressing the key) or scroll
(by holding down the key) through the item choices for a specific
menu. [Shift] [+] (or [-]) allows you to cycle through the item choices in
reverse order.
3-4 Configuration
Reset Menu
Use Reset Menu function with caution. It can result in loss of
buffered page data or printer configuration data. Reset Menu is
activated by holding down both [Shift] and [Menu] for up to 10
seconds until RESET=MENU* appears. Use [+] or [-] to cycle through
items and [Enter] to select the item. The reset is executed by
pressing [On Line].
Table 3-2
(and Menu
of Resets)
Reset Menu Functions
A reset ([Shift] + [Menu]) displays a 07 RESET, clears the printer’s
page buffer, removes all temporary typefaces and macros, and makes
the current user-established defaults “permanent.” They will be the
default values until they are changed by the user.
To access the Menu of Resets, hold down both [Shift] and [Menu] for
about 10 seconds until RESET=MENU* appears in the display panel.
Use [-] to cycle through the display choices, and [Enter] to select the
option. Execute the reset by pressing [On Line]. The printer responds
with a reset message for the choice selected.
The three
choices are:
MENU* clears the page buffer, removes all temporary personality data
such as downloaded typefaces, and resets all printing environment
parameters (such as number of copies, paper size, etc.), and sets
user-selected defaults (such as MP tray default configuration) to their
factory defaults. Certain items, such as the display language or I/O
configuration, are not reset. RESET=MENU clears only the active I/O
input buffer.
ACTIVE I/O clears the page buffer, removes all perishable personality
data such as temporary typefaces, and clears the input and output
buffers for the active I/O only.
ALL I/O clears the page buffer, removes all perishable personality
data such as temporary typefaces, and clears the input and output
buffers for all I/Os.
* indicates factory default.
Configuration 3-5
Control Panel Menus
Figure 3-2 shows the menus and menu items available with the
basic printer configuration. Not all menu items are discussed in
this section. Only those items of specific interest from a service
standpoint, or items new to the printers are discussed in this
section. If options such as PostScript or a different I/O are
installed, new menu items automatically are added at the
appropriate location. For example, a PostScript Menu appears
following the PCL Menu.
3-6 Configuration
Figure 3-2
Control Panel Map
Configuration 3-7
Table 3-3
Printer Menu Items
1* to 999
Select any number from 1 to
LETTER* (110V printers),
LEGAL, A4* (220V printers)
Sets default image size,
unless software setting
overrides it.
COM10* (110V printers),
MONARCH, DL* (220V printers),
C5, B5
P*, L
P means portrait (vertical)
and L means landscape
(horizontal) orientation.
(5 to 128 lines)
60* (110V printers)
64* (220V printers)
Sets vertical spacing from 5
to 28 lines.
Only for MP Tray.
Refines print quality.
(HP LJ4+only)
Reduces amount of toner
(HP LJ4+ with
Duplex only)
Allows for printing on both
sides of paper.
(HP LJ4+with
Duplex only)
Determines orientation of
*indicates factory default.
3-8 Configuration
Table 3-3
PCL Menu Items
Mn (1-4)
Internal fonts*
Cartridge fonts
Permanent soft fonts
SIMM Module: n=slot
number. Typefaces stored in
one of the four ROM SIMM
slots (M1=slot 1, for
0* to 999
Number assigned to each
Depends on the FONT
Many others
A unique grouping of all
characters in a font.
*indicates factory default.
Table 3-4
Job Menu Items
300 or 600*
Sets the resolution.
PS (Postscript)
Sets the printer language.
(HP LJ4+ only)
OFF, 15 MIN, 30
1 HR, 2 HRS, 3 HRS
Sets the amount of time the printer is
idle before the fuser shuts down.
(5 to 300)
Time in seconds that the printer waits
before ending a print job.
(HP LJ4 only)
Only seen with error 21 PRINT
*indicates factory default.
Configuration 3-9
Table 3-5
Configuration Menu Items
Paper is selected first.
Operates as a PC tray.
Operates as a manual feed tray.
and combinations
No trays are locked out.
The MP tray is locked out.
The PC tray is locked out.
The optional Lower Cassette is locked
Indicates a transient condition.
When an error is encountered, printer
goes off line until [SHIFT] + [CONTINUE]
are pressed.
When an error is encountered, printer
goes off line for 10 secs., then comes
back on line.
1, 2, 3*, 4, 5
Determines relative darkness of print.
Higher numbers yield darker print but
shorter toner cartridge life. May take up
to 20 pages for new setting to stabilize.
Printer remains on line and continues to
print after the 16 TONER LOW message
is displayed.
*indicates factory default.
3-10 Configuration
Printer goes off line after the 16 TONER
LOW message is displayed.
Table 3-6
Memory Configuration Items
Memory is automatically determined
by the printer.
No memory is set aside.
Size can be manually adjusted
10K and up
With IO BUFER ON, adjust size in
increments of 10.
Saves resources and extra memory
and personality SIMM are installed in
Printer automatically determines the
amount of memory to allocate to
No memory is allocated.
Additional memory management
selections appear.
0K and up
Increases memory for each installed
*indicates factory default.
Table 3-7
Parallel Menu Items
Sets parallel interface to run at a
higher data rate.
Sets the parallel interface to run at a
slower data rate.
*indicates factory default.
Configuration 3-11
Table 3-8
Serial Menu Items
RS-422 (HP LJ 4 only)
Use the RS-422 when a longer cable
is needed.
Use if the computer requires
hardware flow control.
Use if the computer requires software
flow control.
300 to 57600
Tells how fast information will be
transferred from the computer to the
Appears when pacing is set to
Printer sends XON when printer is put
on line or when sufficient buffer space
is available.
Printer sends one XON when it can
accept more data or when it is put on
Pin 20 is high.
Pin 20 is low.
*indicates factory default.
Table 3-9
Test Menu Items
With SELF TEST displayed, press [ENTER] to run a self test.
Prints continuous self test pages until [ON LINE] or [SHIFT] +
[CONTINUE] are pressed.
Prints a list of typefaces and bitmapped fonts in your printer.
Prints a page that illustrates the printer features.
*indicates factory default.
3-12 Configuration
Printer Features
Some of the important features of the HP LaserJet 4, 4 Plus, and
LaserJet 5 printers are described below.
Page Protection (HP LaserJet 4 only)
The default is PAGE PROTECT=OFF*. Unless you
frequently get 21 PRINT OVERRUN messages, you
may not need to set a value for page protection.
Page protection reserves additional memory for the page image
process, allowing the printer to create an entire page image in
memory before paper starts through the printer. The memory
required for page protection is dependent upon the resolution
selected: a 600-dpi page can take 4 times as much memory as a
300-dpi page. If you use page protection, set it for the size you
expect to use most often. Be sure you have sufficient installed
memory for the option you select. Complex graphics and
PostScript applications also require more memory than is
included in the standard printer configuration.
Unlike earlier HP LaserJet printers, page
protection and resolution can be set regardless of
memory installed in the printer. Be aware that
setting page protection ON will decrease the
amount of memory available for other memory
dependent features.
Configuration 3-13
Resource Saving (HP LaserJet 4 Plus and 5 only)
Resource Saving gives the printer the ability to save certain
entities such as permanent soft fonts, macros, symbol sets and
user-defined graphics patterns when the printer changes
personalities, resolutions or page protect modes. For example, if a
user switches the LaserJet 4 printer from PCL mode to
PostScript mode, all PCL soft fonts macros are lost. The HP
LaserJet 4 Plus/4M Plus printer would not clear these entities
from memory. When the user switches back to PCL from
PostScript all of the PCL entities would still be resident in the
HP LaserJet 4 Plus/4M Plus printer. Resource Saving can only be
accessed when the printer has the PostScript language installed
and a minimum memory configuration of 7 MB. If the printer has
a duplexer option, the minimum amount of memory necessary to
access Resource Saving is 13 MB.
The Resource Saving configuration is located in the Memory
Configuration Menu. Resource Saving can be set for three modes,
AUTO (default), ON, and OFF. Auto configuration sets the
Resource Saving for PCL and Postscript to a minimum value (400
KBytes) for each personality. Setting Resource Saving to ON
allows the user to determine how much printer memory will be
used for Resource Saving for the PCL personality and the
Postscript personality. The memory can be allocated in 100
KBytes increments. For example, if the user sets the Resource
Saving memory size to 200 KBytes, a total of 400 KBytes of
memory will be assigned to Resource Saving. 200 KBytes of
memory will be used for Postscript Resource Saving and 200
KBytes of memory will be used for PCL Resource Saving.
Turning Resource Saving OFF disables the Resource Saving
function and no memory is allocated to Resource Saving.
3-14 Configuration
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 option), the I/O
buffer size can also be adjusted from the control panel. Three
settings exist for the I/O buffer; AUTO (default), ON, and OFF.
AUTO sets the printer’s I/O buffer to a minimum value that is
determined by the total amount of memory that is resident in the
printer. Setting I/O buffering to ON allows the user to set the I/O
buffer size from the front panel. Setting the I/O buffering to OFF
disables I/O buffering .
When you change the I/O buffer setting all
downloaded resources are deleted.
Configuration 3-15
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
EconoMode does not affect print speed or memory
Resolution Enhancement (REt)
The printer Formatter PCA contains circuitry for Resolution
Enhancement technology (REt), which modifies the standard
video dot data on its way to the DC Controller to produce
“smoothed” black-to-white boundaries. REt is user-adjustable
from the front control panel, HP Explorer’s Remote Control Panel
(Print Quality Category) or from some software applications.
Available settings are Light, Medium, Dark or Off. The default
setting is Medium.
REt settings sent from software or printer drivers
override any control panel settings.
3-16 Configuration
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 Protect, are user-selectable
through HP Explorer’s Remote Control Panel (Printer Memory
MEt is only available in PCL mode; it is not
functional when printing in PostScript mode.
Print density is a measure of the darkness of print on the page.
The factory default setting is 3, but you can experiment with
different settings to find the best setting for your job. The lower
numbers lighten the print, the higher numbers darken the print.
(1 = low, 5 = high).
Print density can be affected by resolution enhancement, which
can be set for dark, medium, or light values.
When you set the density to a higher number,
toner is used at a faster rate, reducing toner
cartridge life.
To adjust print density:
Press [On Line] to take the printer off line.
Press [Menu] until CONFIG MENU appears in the display.
Press [Item] until DENSITY appears in the display.
Press [+] or [-] to select the desired setting.
Press [Enter] to save the selection.
An asterisk (*) appears to indicate that your selection was
7 Press [On Line] to return the printer to active status.
8 Print approximately 20 pages to allow the new density setting
to stabilize.
Configuration 3-17
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.
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 printer security:
1 HP Explorer software’s Remote Control Panel for DOS users,
if you are directly connected to the printer through its parallel
2 HP LaserJet Utility for Macintosh users.
3 JetAdmin for Novell networks.
4 PJL escape sequence sent from any ASCII editor.
Remote Control Panel (DOS)
1 Select OPTIONS from the Remote Control Panel screen.
2 Select SECURITY from the OPTIONS menu.
3 Select Use Password from the Printer Passwords box.
4 Type in the password and confirm it in the New Password
box. Numeric password values can be set from 0 to 65535. (If
you already have a password, go the the next step; you will be
prompted for your password.)
5 To lock the printer’s control panel, select ON in the Control
Panel Lock box.
HP LaserJet Utility (Macintosh)
1 Select the HP LaserJet Utility icon in the HP LaserJet
folder on your hard drive.
2 If necessary, double click on the Select Printer button to
select the the appropriate printer.
3 Under the Extras menu, select Control Panel Lock.
4 In the Control Panel Lock: HP LaserJet 4M Plus or 5M
screen, click on the On (Locked) box, then click the OK
button. You will be prompted to enter a password if the
password has been set. If a password has not been set, go to
the next step.
3-18 Configuration
5 Under 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)
2 Select the printer you want to configure. It is listed under its
“JetDirect Interface Name” which appears on the self test
page/configuration plot.
3 Select Configuration.... The Printer I/O Configuration
screen appears.
4 Select Advance.... The Advance Settings screen appears.
5 Select Lock Printer Control Panel....
6 Click on Select... (the Advanced: Printer Security screen
appears), then click on the ON button.
7 Click the OK button.
ASCII PJL Escape Sequence
Password: send this sequence to the printer from any ASCII
%-12345X@PJL JOB
@PJL DEFAULT PASSWORD=[numeric password
(0 to 65535)]
C %-12345X
CPLOCK: to turn on or off, assuming that a password has NOT
been set, send the following ASCII sequence to the printer:
%-12345X@PJL JOB
C %-12345X
If a password HAS been set, send the following ASCII sequence
to the printer to turn CPLOCK on or off.:
%-12345X@PJL JOB PASSWORD=(numeric password)
C %-12345X
Configuration 3-19
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
• 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 use only).
Demo Page=On/Off. Removes the Demo Page option from the
self test menu.
BIG Data=On/Off (HP LaserJet 4 Plus only). Setting BIG
Data to ON increases the size of the printer’s status Readback
The following procedure is used to initiate the Service Mode.
1 Hold down the [ON LINE], [FORM FEED], and [ENTER] keys while
powering ON the printer, until the ON LINE and FORM
FEED Indicators are both illuminated and the Display
Window is blank. (If the Display Window reads 05 SELF
TEST at this point, the keys were released too soon. Repeat
this step until successful.)
2 Press the [FORM FEED] key, then the [ENTER] key. The
message SERVICE MODE is displayed briefly, then the printer
automatically begins a 05 SELF TEST.
After several seconds, the [ON LINE] and [FORM FEED] lights turn
OFF. (The printer may display 02 WARMING UP if it has not
warmed up completely.)
After the printer has warmed up and passed the self test,
SERVICE MODE is displayed.
To exit the Service Mode press the [ON LINE] key.
3-20 Configuration
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:
1 Enter the Service Mode as described previously.
2 When SERVICE MODE is displayed, press the [MENU] key to
access the Service Menu. Press the [ITEM] key to step through
the menu.
3 PAGES=XXXXXX is displayed. XXXXXX represents the page count
currently stored in the printer’s NVRAM. The underlined
character denotes the cursor position.
4 Press the [ENTER] key to scroll the cursor to underline the
desired digit.
5 Press the [+/-] key to select the correct value.
6 Press [ENTER] to store the new value in NVRAM.
7 Set each digit in the same manner. When the last digit’s value
has been entered, press [ON LINE] to return to SERVICE MODE.
8 Click the [ON LINE] key one more time to exit Service Mode.
Configuration 3-21
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:
Enter the Service Mode as described previously.
Press the [Menu] key to display SERVICE MENU.
Press the [Item] key to display CR PAPER=LETTER
Press the [+/-] key to toggle between Letter and A4 paper.
Press the [Enter] key to save your selection.
Press [On Line] to exit the Service Mode.
3-22 Configuration
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 Reset can not
reset the page count, cold reset tray size, or display
language settings. If the Control Panel is locked, a Cold Reset
will disable the lock and return the printer to the factory defaults.
Inform the system administrator of all Cold Resets.
A Cold Reset is performed as follows:
1 Turn OFF the printer.
2 Hold the [On-Line] (or Go for the LJ5) key down while powering
ON the printer.
3 The message COLD RESET is displayed. The COLD RESET does
not take effect until the 00 READY message is displayed.
4 When the 00 READY message is displayed, the default settings
have been returned to the factory defaults and the printer is
ready to accept new settings.
Configuration 3-23
Understanding the PCL Self Test
(Refer to Appendix B for LaserJet 5 information.)
Table 3-10
Self Test Printout Items for the HP LaserJet 4/4M
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.
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 optional menu automatically is
added to the control panel display and Self Test printout after the option is
added to the printer.
MIO Menu: Once a Modular I/0 is added, it appears after the Serial Menu in
the control panel display and in the Self Test.
MIO Information: Reserved for MIO and Network statistics. Note that for some
installed MIO options, this block of information can take up to 20 lines and
three columns.
Formatter Number: Shows the printer’s unique formatter number.
RAM Size: Shows the total amount of installed printer memory, including
added optional memory. Two MBytes of installed memory is standard with the
printer. If you install optional memory, a self test can be used to verify proper
Page Count: Shows how many pages were printed. You can use the page
count to track printer use. The page count is always updated.
Datecodes: Eight-digit dates (YYYYMMDD) indicating when the formatter
firmware and internal typefaces were last revised. This information may be of
use to a service technician.
Other Installed Options: Use this area of the self test to verify the installation
of typeface cartridges, paper trays, and other installed options.
Resolution Enhancement: The REt pattern only appears when the printer is in
600 dpi mode. The REt pattern varies with the RET setting. To optimize REt,
adjust REt and density settings to minimize the appearance of vertical lines
through the block.
Print Pattern: Use the text print pattern to check print density and quality.
3-24 Configuration
Figure 3-3
HP LaserJet 4/4M PCL Self Test Printout
Configuration 3-25
Table 3-11
Self Test Printout Items - HP LaserJet 4 Plus/4M
Standard menu selections: Lists selections in the order in which they
appear in the control panel display.
Optional menus: Shows optional menu selections, such as the
PostScript Menu, and menu items, in the order in which they appear in the
control panel display. Optional menus automatically appear in the control
panel display when options are added to the printer.
MIO Menu: When an optional Modular I/O is added, the MIO Menu
appears following the Serial Menu in the self test and control panel display.
MIO information: Reserved for MIO and network statistics. For some
installed MIO options, this block of information can be as long as 20 lines
and three columns.
Formatter Number: Shows the printer’s unique formatter number.
RAM size: Shows total installed printer memory
PCL Memory Information: Shows the total amount of installed memory.
Also indicates the amount of available memory for PCL applications.
Page Count: Shows number of pages the printer has printed.
Firmware Datecode: Eight-digit date (YYYYMMDD) and version number
of formatter firmware.
Control Panel options status: Shows status of control panel Lock and
Password functions.
Other installed options: Lists optional typeface cartridges, paper trays,
personalities, and other installed options.
Resolution Enhancement: When resolution is set to 600-dpi, the REt
block appears here. The REt block illustrates current resolution
enhancement. To optimize REt, adjust REt and density settings to
minimize the appearance of vertical lines through the block.
I/O Buffering and Resource Saving: Information about the current
configuration appears here. If the printer does not have enough memory
installed to enable I/O Buffering or Resource Saving, the amount of
additional memory needed appears here.
Print Pattern: Illustrates print density and quality.
3-26 Configuration
Figure 3-4
HP LaserJet 4 Plus/4M Plus PCL Self Test
Configuration 3-27
Changing the Control Panel Display
The default control panel display language is set for English.
Supported languages are: English, French, German, Italian,
Spanish, Finnish, Danish, Dutch, Swedish, Norwegian, and
Portuguese. Follow these instructions to change the display
1 Switch OFF the printer.
2 Press and hold [Enter] (or Select on the LJ 5) while switching
the printer ON until CONFIG LANGUAGE appears in the display.
3 After the power-on self test, LANGUAGE=ENGLISH appears. Press
[+] until the desired language appears in the display.
4 Press [Enter] to save your choice. An asterisk (*)appears next
to the language to indicate it is now the default.
5 Press [On Line]. The On Line indicator is lit, and display
messages are now in the language you selected.
If the display language is changed, replace or
install the Control Panel Overlay to match the
selected language. See the index to Chapter 6 for
instructions on changing or installing the Control
Panel Overlay.
Failure to explicitly select a language after
powering on the printer while holding down the
ENTER or SELECT key will cause the printer to
prompt for a specific language every time it is
powered on.
3-28 Configuration
Test Print Button
Figure 3-5
Test Print Button Location
The Test Print button access hole is located on the side of the
printer. Press the Test Print button using a tool similar to a
paper clip (see Figure 3-5). The 15 ENGINE TEST only prints from
the PC tray (Tray 2).
Configuration 3-29
Figure 3-6
Test Print Pattern
Pressing the Test Print button will initiate a 15 ENGINE TEST.
This is an engine test only. The Format PCA is bypassed while
printing this test, although a formatter problem can interfere
with this test. A page of vertical lines is printed if the print
engine is operating correctly (see Figure 3-6).
3-30 Configuration
System Configuration
MS-DOS System Configuration
To communicate properly with the printer, the MS-DOS
environment requires the addition or modification of MODE
commands in the AUTOEXEC.BAT file. Add or modify the
MODE command(s), depending on the interface configuration, as
Parallel DOS Commands
Most IBM PC and AT compatible computers default to a parallel
printer port. To ensure that information is sent to your parallel
printer port, type the following MS-DOS command at your
MS-DOS prompt or include it in your AUTOEXEC.BAT file:
For MS-DOS version 4.0 and above, enter:
This example assumes that you are using parallel
printer port LPT1. If you are using LPT2 or
LPT3, replace LPT1 in the example with the
printer port that you are using.
Since the MODE command is an external MS-DOS command (a
program named MODE.COM is run when the MODE command is
invoked), the program file must be contained in the root directory,
or in a directory specified in a preceding PATH command in the
After changing the AUTOEXEC.BAT file, reboot
the computer to initiate the changes.
Configuration 3-31
Serial MS-DOS Commands
Most IBM compatible computers default to a parallel printer port.
To ensure that information is sent to your serial printer port, type
the following MS-DOS commands at your MS-DOS prompt, or
include them in your AUTOEXEC.BAT file.
MODE COM1:9600,N,8,1,P
For MS-DOS version 4.0 or above, enter:
MODE COM1:9600,N,8,1,B
These examples assume that you are using serial
printer COM1. If you are using COM2 or COM3,
replace COM1 with the the printer port that you
are using.
Since the MODE command is an external MS-DOS command (a
program named MODE.COM is run when the MODE command is
invoked), the program file must be contained in the root directory,
or in a directory specified in a preceding PATH command in the
After changing the AUTOEXEC.BAT file, reboot
the computer to initiate the changes.
3-32 Configuration
Printer I/O Configuration
Parallel Menu
The default setting for the High Speed Parallel I/O is YES. If it is
set to NO, the interface runs at a slower speed that is compatible
with older computers. When the default is set to YES, the parallel
interface runs at a higher rate supported by newer computers.
Advanced Functions
The Advanced Functions feature of the printer enables
bi-directional communications between the printer and the host.
The default setting is ON. This default setting (ON) must be
active in order to use LaserJet Explorer, the Windows Printing
System, and other software applications and drivers.
Serial Configuration
Use RS-232C serial configuration when the printer is located 11
to 50 feet from the computer. If you need to locate the printer
between 51 and 2000 feet from the computer, use an RS-422A
serial configuration (not available on the LaserJet 4 Plus or 5).
Since the default-printer I/O setting on the printer is parallel,
remember to change the settings on the printer control panel for
serial printing.
Serial Protocol
When printing with a serial configuration, the same protocol
must be set on both the printer and the computer. Protocol on
the printer is set by changing the control panel. Protocol on the
computer is set by using DOS commands. The default protocol
settings are described below.
The BAUD-rate setting tells the printer how fast information is
transferred to and from the computer. The default BAUD rate
setting is:
BAUD RATE=9600*.
Configuration 3-33
Pacing (Handshaking)
Pacing (or “handshaking”) is a type of communication between
the printer and the computer. This is an important item in the
printer because it allows the printer to tell the computer when to
send information. If the printer is unable to receive information,
for example, when the print buffer is full or when the printer is
out of paper, a signal is sent to the computer to stop sending
information. When the printer is able to resume receiving
information, it sends another signal to the computer to send more
Pacing is set through the control panel’s Serial Menu. Two types
of handshaking are supported by your printer:
• Select DTR/DSR through the Serial Menu’s PACING item if the
computer requires hardware flow control (most personal
computers do). Through the Serial Menu’s DTR POLARITY item,
the DTR polarity can be set to High or Low. The default is DTR
Select XON/XOFF through the Serial Menu’s PACING item if the
computer requires software flow control (for example, if you
are using a UNIX workstation). Note that status readback
messages are not paced when XON/XOFF is selected. Through
the Serial Menu’s ROBUST XON item, Robust Xon can be set to
ON (the default) or OFF. Note that the ROBUST XON item only
appears under the Serial Menu if XON/XOFF was selected.
3-34 Configuration
Serial Cable Pin-outs
The following cable diagrams show the cable pinouts for the most
common serial configurations.
DB-9 RS-232 Serial Connection — HP LaserJet 4
If the computer has a serial port with 9 pins, use the cable or
equivalent for the HP LaserJet 4.
Figure 3-7
24542G Cable Pinout for 25 to 9 Pin Connector
Configuration 3-35
DB-25 RS-232 Serial Connection — HP LaserJet 4 Plus/5
If the computer has a serial port with 9 pins, use the C2932A or
equivalent cable for the HP LaserJet 4 Plus.
Figure 3-8
C2932A Cable Pinout for 9 to 9 Pin Connector
3-36 Configuration
DB-25 Serial Connection — HP LaserJet 4
If the computer has a serial port with 25 pins, use the 17255D
cable or equivalent for the HP LaserJet 4.
Figure 3-9
17255D Cable Pinout for 25 to 25 Pin Connector
Configuration 3-37
DB-25 RS-232 Serial Connection — HP LaserJet 4 Plus/5
If the computer has a serial port with 25 pins, use the C2933A or
equivalent cable for the HP LaserJet 4 Plus.
Figure 3-10
C2933A Cable Pinout for 9 to 25 Pin Connector
3-38 Configuration
RS-422A Serial Connection (Not available on the HP
LaserJet 4 Plus or 5 printers)
If you are configuring the computer to use an RS-422A serial port,
you need a special cable. Contact the computer or printer network
manufacturer to see if an RS-422A cable is available. If no cable
is available, contact your computer manufacturer for your
computer pin assignments and have a cable constructed.
Figure 3-11
RS-422A Cable Pinout
RS-422A Serial Configuration (LaserJet 4 only)
The default configuration for the serial port on the printer is for
RS-232C serial communication. To set the printer to use RS-422A
serial communication, change the control panel Serial Menu’s
SERIAL setting to SERIAL=RS-422.
Hardware pacing for RS-422 serial
communication is not available on the printer.
Configuration 3-39
Modular I/O Configuration
The printers are equipped with a modular I/O slot. A modular I/O
interface card can be plugged into that slot to increase the
number of interfaces available.
A modular I/O card can provide increased printer performance
when printing from a network. In addition, a modular I/O card
provides the ability to place the printer anywhere on the network.
This eliminates the need to attach the printer directly to a server
or a workstation, and enables you to place your HP LaserJet
printer closer to your network users.
When you install a MIO card, you may need to
perform a Cold Reset to reinitialize the printer’s
control panel.
The HP JetDirect Card allows these printers to operate in
multiple operating system networks.
To determine the appropriate MIO solution for a specific host
system/application environment, refer to the latest edition of the
“HP Peripherals Connectivity Solutions Guide.”
3-40 Configuration
Printer Drivers
Install Printer Drivers and Utilities
Printer drivers are specialized programs designed to allow
specific software applications to function with the HP LaserJet
printers. Printer utilities include such things as the HP Explorer
program modules, which enhance the usability of the printer and
provide convenient access to printer features outside of specific
software applications.
How to Obtain Printer Drivers
First, check the software’s printer selection feature to see if the
printer is listed among the available printers. If it is not, run the
software’s SETUP or INSTALL program to install a “printer
driver” or “printer file” for the printer.
Here are some ways to obtain printer drivers and Software
Application Notes for HP LaserJet printers:
• Check the Printing Software package to see if it includes a
driver for your software.
• Order an updated driver from the software vendor.
• Call Hewlett-Packard at 970-339-7009.
• Obtain a driver request form by fax through HP FIRST
(call 1-800-333-1917) U.S. only.
• Download a driver through CompuServe’s HP Forum. To sign
up for CompuServe, call 1-800-524-3388.
While waiting for a specific HP LaserJet printer
driver, you can substitute a similar printer driver
(such as a driver for the HP LaserJet III, IIIP, or
4 printer). These substitute drivers will allow you
to use the printer, but they do not support all of
the printer’s features.
Configuration 3-41
DOS Utilities
Use the DOS Utilities to install printer drivers for MS-DOS
applications. Printer driver software for some common software
applications are included the DOS Utilities. See the Doing
Business With HP section of Chapter 1 for information on
software drivers not included with the LaserJet DOS Utilities.
A DOS Utilities disk is shipped with every printer. If the DOS
Utilities is not installed on the host computer, look for the DOS
Utilities software disks in the documentation package that came
with the printer and install the software.
3-42 Configuration
Packing the Printer
Repackaging Instructions
The printer warranty is for one-year and must be returned to an
Authorized HP service center for service. If the original packaging
material is no longer available, replacement packing and
shipping material is available from HP’s Support Material
Organization (SMO) for a charge. To order replacement packing
and shipping material, call:
1-800-227-8164 (U.S.)
416-678-9430 (Canada)
To order the shipping box and packing inserts for the printers,
ask for part number C2001-00906.
In other countries, return the printer to the selling dealer or the
HP-authorized service center for your service area.
Packing Checklist
• Remove and retain any accessories that were installed in the
printer. This includes:
• Toner Cartridge
• Optional Lower Cassette
• Envelope Feeder
• Accessory Cartridge
• Duplex Assembly (LaserJet 4 Plus/5)
• Optional Memory, Personality SIMMs, or Flash
Include print samples that indicate the problem.
If the problem is associated with media, include 50-100 sheets
of the media causing the problem.
Configuration 3-43
Installing The Optional Lower
Please see also the Service Notes section for
proper use and adjustment of the lower cassette.
These printers have an optional 500-sheet Lower Cassette which
is installed in the field. Follow these instructions to install the
Lower Cassette.
1 Disconnect the cables from the printer.
2 Unpack the 500-sheet Lower Cassette Assembly.
3 Place the Lower Cassette base (without its paper tray) in the
selected location.
4 Place the printer on top of the Lower Cassette Assembly, as
shown in Figure 3-12.
Install the printer onto the Lower Cassette Base
so that the alignment pins on the cassette base
mate with the holes in the bottom of the printer.
Figure 3-12
Installing the Printer on the Lower Cassette
5 Reconnect the printer cables and run a self test to ensure the
lower cassette is recognized by the printer.
3-44 Configuration
Loading Paper into the Optional Lower Cassette
Figure 3-13
Pull the cassette tray straight out of the printer.
Figure 3-14
Adjust the cassette for the paper size you want
to load.
Configuration 3-45
Figure 3-15
Slide about 450 sheets of paper into the tray, up
against the adjustable bracket that sets the
paper length.
Figure 3-16
Press down on the stack of paper until the top of
the stack fits under the top edge of the back
green bracket.
3-46 Configuration
Figure 3-17
Push down the left corner of the stack until the
paper is secured undered the metal clip.
Figure 3-18
Set the knob on the top right of the cassette to
the paper size you have loaded.
Configuration 3-47
Figure 3-19
Note: cassette MUST be full before adjusting the
To adjust the tension, tap the stack of paper
several times and turn the leftmost knob on the
cassette until the arrows on the indicator align.
Tap the stack again and verify the arrows are
still aligned.
Figure 3-20
Slide the cassette back into the Lower Cassette
3-48 Configuration
Envelope Feeder Installation
For complete information about installing the Envelope Feeder,
see Envelope Feeder User’s Guide. This guide is provided with the
envelope feeder. The instructions below are not intended to
replace the information of the Envelope Feeder User’s Guide.
The LaserJet 4, 4 Plus, and 5 printers all use
different envelope feeder products.
To install the Envelope Feeder:
1 Turn OFF the printer.
2 Open the MP tray.
3 Remove the black plastic cover from inside the printer (see
Figure 3-21).
Figure 3-21
Remove the Black Plastic Cover
Configuration 3-49
Figure 3-22
Install the Envelope Feeder
4 Insert the Envelope Feeder firmly into the printer (see Figure
5 Turn ON the printer.
LaserJet 4 and 4 Plus
The envelope size (EE TRAY=) appears on the display when the
envelope feeder is installed and loaded with envelopes. The
envelope size can be selected through the Control Panel. Paper
jams can result if the envelope size selected does not match the
envelopes loaded into the envelope feeder.
LaserJet 5
The envelope size (ENV FEED=) appears in the CONFIG MENU when
the envelope feeder is installed. The envelope size can be selected
in the CONFIG MENU. Paper jams can result if the envelope size
selected does not match the envelopes loaded into the envelope
It is not necessary to configure the Envelope
Feeder to the printer through the printer’s
Control Panel. The printer automatically
recognizes the presence of the Envelope Feeder
and prints from the feeder as the software
3-50 Configuration
SIMM Installation
SIMM installation is covered in detail in the the printer’s User’s
Manual and in the kit that accompanies the SIMM. The
instructions shown here are not intended to replace these sources.
Follow these instructions to install memory, language, and flash
SIMM boards. Install all types of SIMM boards in the same
Protecting the SIMM Board
SIMM boards can be damaged easily by small amounts of static
electricity. To prevent damage from static electricity:
• Touch the surface of the antistatic package before removing
the board from its package. When handling the board,
frequently touch bare metal on the printer or the antistatic
bag, or wear an antistatic wrist strap.
Avoid moving about the work area to prevent generating static
Handle the board carefully at all times. Avoid flexing it or
touching its components.
Configuration 3-51
Any SIMM board can be installed in any of the four SIMM slots.
Because the slots are close together, we recommend installing
them from right to left, starting with slot 1 and ending with slot 4.
Figure 3-23
Identifying the Four SIMM Slots
3-52 Configuration
Memory Requirements
A page’s complexity (rules, graphics, or dense text) may exceed
the printer’s ability to create the image rapidly enough to keep
pace with the printing process. If a page is too complex, only part
of the page prints, and some print data loss is likely. In such
cases, a 21 PRINT OVERRUN message (signifying possible loss of
print data) or a Clearable Warning message appears in the
Table 3-12
Minimum Memory Recommendations
LaserJet 4 Only
PCL Only
300 dpi
Letter/A4 Pages
Page Protect OFF
2 (1.6)
Legal Pages1
Page Protect OFF
600 dpi
PostScript Only
300 dpi
600 dpi
2 (1.4)
2 (1)
6 (2.3)
2 (1.6)
2 (1.4)
3 (1.7)
6 (1.3)3
Letter/A4 Pages1
Page Protect ON
2 (0.8)
6 (1.9)
2 (1)
6 (2.3)
Legal Pages1
Page Protect ON
3 (1.6)
6 (1)
3 (1.7)
6 (1.3)
1 More memory may be required if using downloaded soft fonts, forms, or complex
text with a large number of downloaded typefaces.
2 Numbers in parentheses indicate the approximate amount of memory available to
the user for data files, downloaded typefaces, and other non-system uses.
3 For PostScript language applications only, a “mini-legal” page will print with this
amount of memory.
Configuration 3-53
When removing a board from the antistatic
package, avoid touching the metal traces on the
SIMM board.
For memory boards, compare the part number on the outside of
the package to the part number in the table below. If you have
not received the correct board, notify your authorized
Hewlett-Packard dealer immediately.
Table 3-13
SIMM boards
Part Number
HP LaserJet 4/4M
One MB
Two MB
Four MB
Eight MB
HP LaserJet 4+/4M+/5/5M/5N
C 3130A
One MB
Two MB
C 3132A
Four MB
C 3133A
Eight MB
C 3146A
Sixteen MB
The LaserJet 4 Plus Optional Memory (C3130A, C3131A,
C3132A, C3133A, or C3146A) is not compatible with the HP
LaserJet 4. If the LaserJet 4 Plus Optional Memory is installed
in the LaserJet 4, the printer will display a “53.1X.08 ERROR” (X
indicates the position of the SIMMs slot).
3-54 Configuration
Accessing the SIMM Slots
Please refer to Chapter 6, Removal and Replacement, for
instructions on removing the SIMMS door to access the slots.
Note that access to the SIMM slots are slightly different for the
various printer models.
Installing the SIMM Boards
Figure 3-24
Positioning the SIMM board with the notch at the
1 Through the open door, you can see the four SIMM board slots
(see previous Figure 3-23). For easiest installation, fill the
slots from right to left, starting with slot 1 (see the diagram on
the SIMM slots door).
2 Remove the SIMM board from the antistatic package. Hold
the board with your forefingers on the side edges and your
thumbs against the back edge. Turn the board so the notch on
one end is on the bottom and the metal teeth face the slot (see
Figure 3-24.
Configuration 3-55
Figure 3-25
Installing the SIMM Board
3 Hold the SIMM board at a 30-degree angle to the slot and
push the edge of the board evenly and firmly into the slot (see
Figure 3-25 callout (A) ).
4 Rotate the SIMM board to the right until the board “clicks”
into the metal locking tabs, securing the board into place (see
Figure 3-25 callout (B)).
5 Gently rock the SIMM board back and forth. If it is seated
correctly, it will not lift away from the slot. If it lifts up, you
have not pushed it firmly enough into the slot. Try again.
6 Replace the SIMM door and screws.
7 Replace the right side cover.
8 Close the top front cover and gently press down on each end
until the cover is completely seated.
3-56 Configuration
Testing a SIMM Board
Use the procedures below to print a self-test page to verify SIMM
board installation. Procedures are given for both memory and
PostScript SIMMs.
Memory SIMM
For the LaserJet 5/5M/5N, the On Line key has
been replaced by the Go key. The Enter key has
been replaced by the Select key.
Running a Self Test Printout
1 Plug in the power cord and turn ON the printer.
2 After a few seconds, 00 READY should appear in the control
panel display. If an error message appears, refer to
“Troubleshooting a SIMM Board” later in this chapter.
3 Press [On Line] to take the printer off line.
4 Press [Menu] until TEST MENU appears in the control panel
5 Press [Item] until SELF TEST appears in the control panel
6 Press [Enter] to print a self test.
7 Press [On Line] after the self test printed.
Locate “RAM SIZE” on the self-test printout. This is the amount
of printer memory now installed in the printer.
Configuration 3-57
Personality SIMM
A personality (printer language) SIMM installation can be
verified as outlined below (a PostScript SIMM is used in this
For the LaserJet 5/5M/5N, the On Line key has
been replaced by the Go key. The Enter key has
been replaced by the Select key.
1 Plug in the power cord and turn ON the printer.
2 After a few seconds, the on line indicator should light and 00
READY should appear in the control panel display. If an error
message appears, refer to “Troubleshooting a SIMM Board”
3 Press [On Line to take the printer off line.
4 Press [Menu] until JOB MENU appears in the control panel
5 Press [Item] until PERSONALITY=AUTO*, the default, appears in
the control panel display.
6 Press [+] until PERSONALITY=PS appears in the display. This
indicates that your printer recognizes that PostScript is
installed. If PERSONALITY=PS does not appear, check the
SIMM installation.
7 Press [On Line] to return the printer on line.
3-58 Configuration
Troubleshooting a SIMM Board
For more information about the service/error messages below, see
Chapter 7, Troubleshooting.
Service / Error Messages
One of two messages can be generated when your printer is
checking its SIMM internal memory.
where X = 1, 2, 3, or 4
This error indicates a SIMM parity error. The x indicates which
SIMM slot generated the error. If these messages appear first,
check the HP part number to make sure you have the right SIMM
where X = 0, 1, 2, 3, 4, or 5
This error indicates your printer identified a problem while
checking memory.
If x=0, the problem is in internal Read Only Memory (ROM) on
the Formatter.
If x = 1, 2, 3, or 4, the problem is in SIMM slot 1, 2, 3, or 4.
If x = 5, the problem is in an external cartridge installed in the
Refer to chapter 7 for more information.
Configuration 3-59
3-60 Configuration
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