HP 4 Plus Manual

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.  
RS-422A Serial Configuration (LaserJet 4 only)
The default configuration for the serial port on the printer is...

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...

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...

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...

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...

Installing The Optional Lower
Cassette   
NotePlease 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.
1Disconnect the cables from the printer.
2Unpack the 500-sheet Lower Cassette Assembly.
3Place the Lower Cassette base (without its paper tray) in the
selected location.
4Place the printer on top of the Lower Cassette...