26 August 1998OVERALL MACHINE CONTROL
1.4.2 MCB (MECHANICAL CONTROL BOARD)
Overall
Information
G025V507.WMF
Overall
The mechanical control board (MCB) controls devices related to the printer and
optional paper feed unit.
The MCB contains a CPU (H8), peripheral control gate array (GEPC), video I/F
chips, motor drivers, power pack, and on-board sensors.
Functions
1. To control the main motor, laser diode driver, polygon mirror motor, sensors,
and so on.
2. To control fusing temperature through the power supply unit (PSU).
3. To generate high voltages for development bias, charge voltage, and transfer
voltage.
4. To control the optional paper feed unit.
Contents
1. H8
This eight-bit CPU controls the MCB. It receives outputs from sensors and the
thermistor.
2. GEPC
This chip contains an I/O port and controls the main motor, laser diode driver,
polygon mirror motor, optional paper feed unit, and so on. This chip generates
the pulse width modulation signal to control the power pack.
3. Video I/F
This chip is the interface for the control board.
4. Sensors
The registration sensor and paper exit sensor are built into this board.
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ACEC
