Xerox Phaser 8400 Service Manual

2-22 Phaser 8400/8500/8550 Color Printer
I/O Board
The I/O Board acts as the “eyes”, “ears”, and “hands” for the electronics module. All
sensor and switch readings are input into the I/O Board. The I/O Board then translates
these states into encoded information that it sends over a serial data bus (I/O Board
data cable) to the electronics module. The electronic module has no direct connection
to sensors, switches, or solenoids. In order to activate a clutch or solenoid, the
electronic module sends a command to the I/O Board, which processes the command
and activates the appropriate device.
Sensors
Sensors throughout all the major subsystems provide indicators of vital print
operations. The following graphic identifies the location of the printer’s sensors.
s8500-023
Exit Door Sensor
Strip Sensor
Paper Exit Sensor
Drum
Temperature
Sensor
Drum
Position
Encoder
Tray Paper
Size Sensor
Board
Preheater
Sensor
Deskew
Sensor
Pick Sensor
(525-sheet
Feeder)
Tray Empty
Sensor (Also in
Trays 3 & 4)
Ink Low
Ink Out
(x1 for 8400; x4 for 8500/8550)
Front Door
Sensor
Tray Lift Sensor
(Also in Trays 3 & 4)

Xerox Phaser 8400 Specifications

General

Brand	Xerox
Model	Phaser 8400
Category	Printer
Language	English