I/O Board - Xerox Phaser 8400 Service Manual

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.
(x1 for 8400; x4 for 8500/8550)
Exit Door Sensor
Preheater
Sensor
Front Door
Sensor
Deskew
Sensor
Tray Empty
Sensor (Also in
Trays 3 & 4)
Pick Sensor
(525-sheet
Feeder)
2-22
Ink Out
Strip Sensor
Ink Low
Paper Exit Sensor
Tray Lift Sensor
(Also in Trays 3 & 4)
Phaser 8400/8500/8550 Color Printer
Drum
Temperature
Sensor
Drum
Position
Encoder
Tray Paper
Size Sensor
Board
s8500-023