Formatter hardware The formatter system contains the following: CPU —Is a 133 Mhz Motorola Coldfire V4 with a 66 MHz bus. Read-only memory (ROM) —Stores the dot patterns of internal character sets (fonts) in addition to storing microprocessor control programs. Random-access memory (RAM) —Stores printing and font information received from the host system, and can also serve to temporarily store a full page of print-image data before the data is sent to the print engine. Increasing the RAM will increase performance of graphic intense printing operations but it will not increase the I/O buffer space or cause the printer to print more pages per minute.
Nonvolatile memory (NVRAM) —Stores information about the I/O and print environment configuration. The printer keeps the contents of NVRAM when the power is turned off or disconnected. (As in other HP LaserJet printers, downloaded fonts and macros are saved in conventional RAM and are lost when power is turned off.) Interfaces • Parallel interface —Receives incoming data through its IEEE1284 B interface connector. The IEEE1284 B interface provides high-speed, two-way communication between the printer and the host, letting the user change printer settings from the host computer. • USB —Receives incoming data through its universal serial bus (USB) connector.
The USB interface provides high-speed, two-way communication between the printer and the host, letting the user change printer settings computer. • EIO —The PCI-based enhanced input/output (EIO) slots support a wide range of print servers and other add-on devices. HP JetDirect EIO cards provide high-speed, two-way communication for network printing over Ethernet, Ethernet and LocalTalk, Token Ring, or Fast Ethernet networks. • FIR —This port is compliant with the specifications determined by the Infrared Data Association (IrDA). On the right side of the FIR port is a status light that indicates when the port is active. The FIR port transmits data at speeds of up to 4 MB per second.
When the infrared (IR) connection is established, the FIR status light comes on. If the connection is broken, or when the print job is complete, the FIR status light goes off. Formatter subsystem Resolution Enhancement technology (300 and 600 dpi only) Contains circuitry for Resolution Enhancement technology (REt), which modifies the standard video dot data on its way to the engine controller assembly to produce smoothed black-to-white boundaries. The default is on. Print-density adjustment Affects the line width (boldness) of the print image. This is accomplished by varying the developer dc bias, which controls the amount of toner applied to the photosensitive drum.
Settings range from 1 (lightest) to 5 (darkest). The default is 3. EconoMode Uses approximately 50 percent less toner than standard mode printing by reducing the dot density. Users can adjust EconoMode, which can also be thought of as draft mode, through software applications. The default setting is off. EconoMode does not affect print speed or memory usage. C7058-90936 Printer functionality and operation 75