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128 Theory of operation Q2431-90912
EconoMode
The EconoMode setting uses up to 50 percent less toner than standard mode printing by
reducing the dot density. However, EconoMode does not extend the life of toner cartridge
components. EconoMode, which can be thought of as “draft mode,” can be selected from the
control panel (print-quality menu) and through some software applications and printer drivers.
The default setting is OFF.
CAUTION HP does not recommend full-time use of EconoMode. If EconoMode is used full-time, it is possible
that the toner supply will outlast the mechanical parts in the toner cartridge.
Note EconoMode does not affect print speed or memory usage, or extend the life of the toner cartridge.
Input/output
Parallel interface
The formatter receives incoming data through its bidirectional interface (IEEE-1284). The I/O
provides high-speed and two-way communication between the printer and the host, allowing the
user to change printer settings and monitor printer status from the host computer. The user can
configure the HIGH SPEED item in the control panel. The default setting, YES, makes it possible for
the I/O to run at the higher speeds supported by most newer computers. When set to NO, the
parallel interface runs at the slower mode that is compatible with older computers. The user can
also configure the ADVANCED FUNCTIONS item. The default setting, ON, accommodates two-way
parallel communications. The OFF mode disables the advanced functionality. The I/O is
compatible with the bidirectional parallel interface standard.
Expanded I/O
The optional expanded I/O (EIO) card can be installed in the slots provided on the formatter. It
provides automatic I/O switching between multiple computers or networks connected to the
printer.
Flash
Optional flash is available in 2 MB and 4 MB flash memory DIMMs for storing forms, fonts, and
signatures.
Hard-disk accessory
The optional hard-disk accessory can be mounted in one of the EIO slots on the rear of the
formatter. The optional EIO-based hard disk is used for creating multiple original prints (mopies)
and storing forms, fonts, and signatures.
CPU
The HP LaserJet 4200 series printer formatter incorporates a 300 MHz RISC processor.
The HP LaserJet 4300 series printer formatter incorporates a 350 MHz RISC processor.