HP LaserJet 4250 Service Manual - Page 177
Expanded I/O, Flash (HP LaserJet 4200/4300 Series printers only), Hard-disk accessory, CPU
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Expanded I/O The optional expanded I/O (EIO) card can be installed in the designated slots on the formatter. It provides automatic I/O switching between multiple computers or networks that are connected to the printer. NOTE Only one slot is available on HP LaserJet 4200L printers. Flash (HP LaserJet 4200/4300 Series printers only) Optional flash is available in 2 MB and 4 MB flash memory DIMMs for storing forms, fonts, and signatures. CompactFlash card (HP LaserJet 4250/4350 Series printers only) Optional CompactFlash cards can be used to permanently store downloaded items, such as fonts and forms, even when the printer is off. These cards can also be used to enable the printer to print non-Roman characters. 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 HP LaserJet 4200/4200Lseries printer formatters incorporate a 300 MHz RISC processor. HP LaserJet 4300 series printer formatters incorporate a 350 MHz RISC processor. HP LaserJet 4250/4350 series printer formatters incorporate a 460 MHz RISC processor. Printer memory If the printer encounters a problem when managing available memory, a clearable warning message appears on the control panel. Some printer messages are affected by the auto-continue and clearable warning settings on the printer control-panel configuration menu. If CLEARABLE WARNING=JOB is set on the control panel, warning messages appear on the control panel until the end of the job from which they were generated. If CLEARABLE WARNING=ON is set, warning messages appear on the control panel until GO is pressed. If an error occurs that prevents printing and AUTO CONTINUE=ON is set, the printer goes offline for 10 seconds before it returns online. If AUTO CONTINUE=OFF is set, the message appears until GO is pressed. Read-only memory Besides storing microprocessor control programs, the read-only memory (ROM) stores dot patterns of internal character sets (fonts). Random-access memory The random-access memory (RAM) contains the page, I/O buffers, and the font storage area. It stores printing and font information received from the host system, and can also serve to temporarily Formatter system 163