Electrical Components; Main Controller Board - Xerox Phaser 3250 Service Manual

Electrical Components

Main Controller Board

Phaser 3250 Laser Printer Service Manual
The Engine Board and the Controller Board have been integrated into one
Main Controller Board, which consists of the CPU and printer control
functions. The CPU functions as the bus control, I/O handling, drivers, and PC
interface. The Main Controller Board sends the current image video data to
the Laser Unit and manages the electrophotographic printing process.
Circuits on the Main Controller Board drive the Main Motor (paper feed),
Clutch, Pre-Transfer Lamp, Heat Lamp, and Fan.
The signals from the Paper Feed Jam Sensor and Paper Empty Sensor are
inputted to the Main Controller Board.
U4 EEPROM
DC to DC
Converter, 3.3V
DC to DC
Converter, 1.3V
U8 ASIC
U3 EEPROM
U6 SDRAM
USB IC
U17 NOR FLASH
U18 NOR FLASH
Theory of Operation
U7 SDRAM
Ethernet IC
s3250-028
2-13