Tektronix Phaser 840, Service Manual

Page: 28 / 207

Service Guide 17
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
supports two base Heisei Kanji fonts; other 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 printer. 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 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.