Engine H/W Specifications - Samsung ML-2851ND/XAZ Service Manual

2.2.3 Engine H/W Specifications

2.2.3.1 Main Board
The Engine Board and the Controller Board are in one united board, and it is consisted of CPU part and print part in
functional aspect. The CPU is functioned as the bus control, I/O handling, drivers, and PC interface. The main board
sends the Current Image of Video data to the LSU and manages the conduct of Electrophotography for printing. It is
consisted of the circuits of the motor (paper feed, pass) driving, clutch driving, pre-transfer lamp driving, current driving,
and fan driving.
The signals from the paper feed jam sensor and paper empty sensor are directly inputted to the main board.
HVPS CN4
HVPS CN4
( 24V : 13 14
( 24V : 13 14
24VS : 9 10 )
24VS : 9 10 )
EEPRO
EEPRO
M
M
U3, U4
U3, U4
SMPS CN10
SMPS CN10
( 24V : 4 6 8 10
( 24V : 4 6 8 10
5V : 12 14 16 )
5V : 12 14 16 )
ASIC
ASIC
U8
U8
DC to DC
DC to DC
Converter
Converter
(3.3V) U15
(3.3V) U15
DC to DC
DC to DC
Converter
Converter
(1.3V) U5
(1.3V) U5
Service Manual
Product spec and feature
SDRA
SDRA
M
M
U6, U7
U6, U7
2-17
Network
Network
Interface & IC
Interface & IC
USB
USB
Port &
Port &
IC
IC
NOR Flash
NOR Flash
U17, U18
U17, U18
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