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4-9
Samsung Electronics
Summary of product
Service Manual
4.3 Main PBA
The Engine Board and Controller Board have been integrated into a single PBA. This consists of the CPU, printer
scanner and line control functions. The CPU functions as the bus controller, I/O handler, motor driver and PC inter-face.
The main board sends the Current Image Video data to the LSU and manages the Electrophotographic printing
process. Circuits on the PBA drive include the main motor (paper feed, cartridge, fuser), clutch driver, pre-transfer
lamp driver, heat-lamp driver, CIS driver, scan motor driver and fan driver.
The signals from the paper feed jam sensor and paper empty sensor are inputted to the main board from
the power supply PBA.
REGULATOR
(1.8V) (U2)
REGULATOR
(3.3V) (U3)
MOTOR
DRIVER (U15)
EMI ATTENUATOR
(U13)
CRYSTAL
(OSC2)
COMPARATOR
(U16)
GRAPHIC
PROCESSOR
ASIC (U5)
TRANSCEIVER
(U9)
SDRAM
(U7)
FLASH
MEMORY (U69)
SUPER 1284
(U11)