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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.
Summary of Contents for Phaser 840
Page 11: ...xii Phaser 840 and 850 Color Printers ...
Page 65: ...54 Phaser 840 and 850 Color Printers ...
Page 101: ...90 Phaser 840 and 850 Color Printers ...
Page 125: ...114 Phaser 840 and 850 Color Printers ...
Page 134: ...Service Guide 123 Clearing PostScript NVRAM menu item ...
Page 135: ...124 Phaser 840 and 850 Color Printers ...
Page 166: ...Service Guide 155 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 9 9 ...
Page 170: ...Service Guide 159 Figure 3 Paper path FRUs 0388 80 2 1 5 11 10 9 12 6 4 3 7 13 8 11a 11b ...
Page 172: ...Service Guide 161 Figure 4 Motor and fan FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 174: ...Service Guide 163 Figure 5 Circuit board FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 81 12 7a ...
Page 176: ...Service Guide 165 Figure 6 Solenoid and clutch FRUs 4 5 3 2 1 0388 23 ...
Page 182: ...Service Guide 171 Figure 9 High capacity PaperTray 0388 65a 1 2 ...