Phaser 3250 Laser Printer Service Manual 2-13
Theory of Operation
Electrical Components
Main Controller Board
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.
s3250-028
Ethernet IC
U18 NOR FLASH
U17 NOR FLASH
U8 ASIC
DC to DC
Converter, 1.3V
DC to DC
Converter, 3.3V
U3 EEPROM
U4 EEPROM
U6 SDRAM
U7 SDRAM
USB IC