General Information
1 - 13
Circuit Boards
Seven circuit boards support the printer’s electronics. Two boards, called I/O boards (left
and right), support the front panel, solenoids and sensors. The main board contains the
printer’s CPU processor, RAM and ROM. The power control board distributes power
supply voltages to the other printer boards and many of the printer motors. The power
supply converts the AC line voltage into internal AC and DC voltages. The front panel
provides a user interface to the printer. The printhead drive board, a part of the printhead,
manages the signals and voltages of the printhead’s printing elements and sensors. The
optional network card (Phaser 840 and 850 only) and internal hard drive could be
considered eight and ninth circuit boards.
Fig 1-4 Circuit boards of the print engine (right front view of the
Phaser 850)
0388-03
I/O board
right
Front
panel
Summary of Contents for Phaser 840
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