Xerox Phaser 840, Руководство по обслуживанию, Страница: 37 / 287

General Information 1 - 21
The Main Board
The main board features the printer’s PowerPC 603e processor that controls the engine
and the PostScript processing. Prominent on the main board is the ROM code DIMM and
the RAM DIMM plug-in modules. The code ROM DIMM also contains the printer’s
on-board fonts. For the Phaser 840, alternate ROM code DIMMs contain language fonts
such as Kanji or Hangul. The Phaser 850 printer support two base Heisei Kanji fonts;
other Asian fonts are available on the internal IDE drive. For the Phaser 860, all Asian
fonts are available on the internal IDE drive.
Network connection is provided through a built-in 10BaseT port in the Phaser 840 printer
and a 10/100BaseT port for the Phaser 850/860 printer (not enabled in the Phaser 860B).
For the Phaser 840 printer, a plug-in SCSI interface adapter board provides a SCSI port for
an external hard drive or scanner.
The Phaser 840 printer stores unique printer status and PostScript values in its socketed
NVRAM and EEPROM modules. The printer’s Ethernet address, unique to each printer,
is stored in the EEPROM (printer ID chip), an 8-pin socketed IC.
For the Phaser 850/860 printer, all printer NVRAM parameters, such as the printer ID,
unique printer status and PostScript values, and Ethernet address, are
all stored in the
socketed EEPROM.
All socketed components should be transferred to a replacement main board to maintain
customer-unique settings.
Fig 1-12 Features of the Phaser 840 printer main board
0388-09
SCSI riser
board
RAM DIMMs
NV RAM/
Real Time Clock
Code ROM
DIMM
EEPROM
Printer ID