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 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 .
NoteWhen 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
Note EconoMode does not affect print speed or memory
usage.
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.
Note 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
Category).
Note MEt is only available in PCL mode; it is not
functional when printing in PostScript mode.
Density  
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.
NoteWhen you set the density to a higher number,
toner is used at a faster rate, reducing toner
cartridge life.  
To adjust print density:
1Press 
[On Line]  to take the printer off line.
2Press [Menu]  until CONFIG MENU  appears in the display.
3Press [Item] until  DENSI\fY  appears in the display.
4Press [+] or  [-] to select the desired setting.
5Press  [Enter]  to save the selection. 
6An asterisk ( *) appears to indicate that your selection was
saved.
7Press  [On Line]  to return the printer to active status.
8Print 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. 
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 printer security:
1HP Explorer software ’s Remote Control Panel for DOS users,
if you are directly connected to the printer through its parallel
port .
2HP LaserJet Utility for Macintosh users.
3JetAdmin for Novell networks.
4PJL escape sequence sent from any ASCII editor.
Remote Control Panel (DOS)
1Select  OP\fIONS  from the Remote Control Panel screen.
2Select SECURI\fY  from the  OP\fIONS menu.
3Select Use Password  from the Printer Passwords  box.
4Type 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.)
5To lock the printer ’s control panel, select  ON in the Control
Panel Lock box.
HP LaserJet Utility (Macintosh)
1Select the  HP LaserJet Utility  icon in the HP LaserJet
folder on your hard drive.
2If necessary, double click on the  Select Printer button to
select the the appropriate printer.
3Under the Extras menu, select  Control Panel Lock.  
4In 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 
						

							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  screen appears.
5Select Lock Printer Control Panel... . 
6Click on Select... (the  Advanced: Printer Security  screen
appears), then click on the  ON button.
7Click the OK button.
ASCII PJL Escape Sequence
Password:  send this sequence to the printer from any ASCII
editor:
E C %-12345X@PJL JOB
@PJL DEFAULT PASSWORD=[ numeric password 
(0 to 65535 )] 
@PJL EOJ
E C %-12345X 
CPLOCK:  to turn on or off, assuming that a password has  NOT
been set, send the following ASCII sequence to the printer:
E C %-12345X@PJL JOB
@PJL DEFAULT CPLOCK=ON [ OFF]
@PJL EOJ
E C %-12345X
If a password  HAS been set, send the following ASCII sequence
to the printer to turn CPLOCK on or off.:
E C %-12345X@PJL JOB PASSWORD=(numeric password)
@PJL DEFAULT CPLOCK=ON(OFF)
@PJL EOJ
E 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
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 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
Buffer.
The following procedure is used to initiate the Service Mode.
1Hold 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.)
2Press the [FORM FEED]  key, then the [ENTER] key.  The
message SERVICE MODE  is displayed briefly, then the printer
automatically begins a  05 SELF \fES\f.
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:
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 displayed. XXXXXX represents the page count
currently stored in the printer ’s NVRAM.  The underlined
character denotes the cursor position.
4Press the [ENTER] key to scroll the cursor to underline the
desired digit.
5Press the [+/-]  key to select the correct value.  
6Press [ENTER] to store the new value in NVRAM.
7Set each digit in the same manner. When the last digit ’s value
has been entered, press  [ON LINE] to return to  SERVICE MODE.
8Click 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:
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 between Letter and A4 paper.  
5Press the  [Enter] key to save your selection.
6Press [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:
1Turn OFF the printer.
2Hold the  [On-Line] (or Go for the LJ5) key down while powering
ON the printer.
3The message  COLD RESE\f is displayed. The  COLD RESE\f does
not take effect until the  00 READY message is displayed.
4When 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
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 optional menu automatically is
added to the control panel display and Self Test printout after the option is
added to the printer. 
3 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. 
4 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.
5 Formatter Number: Shows the printer ’s unique formatter number. 
6 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
installation. 
7 Page Count: Shows how many pages were printed. You can use the page count to track printer use. The page count is always updated. 
8 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.
9 Other Installed Options: Use this area of the self test to verify the installation of typeface cartridges, paper trays, and other installed options.
10 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.
11 Print Pattern: Use the text print pattern to check print density and quality.
Table 3-10Self Test Printout Items for the HP LaserJet 4/4M
3-24 Configuration