Ricoh Aficio MP 2550B, Service Manual

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Overview
D017/D018/D019/D020 6-8 SM
Length (Color) detect the size of the original.
S
APS Sensor 5: Original
Length (Color)
1 of 5 APS sensors used in the color scanner unit to
detect the size of the original. EU only .
S
Scanner HP Sensor
(Color)
Detects the position of the scanner unit in the color
scanner.
PCBs
PCB Operation Panel Controls the operation panel.
PCB MBU
Mother Board Unit. Interfaces between the BCU and
controller board.
PCB Controller Board
Controls all applications both directly and through
other control boards.
PCB Network Interface Card
Enables scan-to-email, LAN faxing, IP faxing,
Internet faxing, and other functions.
PCB IPU Image Processing Unit. Performs image processing.
PCB LSDB
Laser Synchronization Detection Board. Detects
when the laser is about to start another main scan
across the OPC drum
PCB LDD Laser Diode Driver. Controls the laser diodes.
PCB PSU
Power Supply Unit. Provides dc power to the system
and ac power to the fusing lamp and heaters.
PCB SBU (Mono)
Sensor Board Unit. Contains the CCD, and outputs a
video signal to the IPU board.
PCB SIU (Mono)
Connects and interfaces between the IPU and the
SIO of the monochrome scanner unit.
PCB SIO (Mono)
Interfaces between scanner unit and BCU, controls
sensors and motors in the scanner unit.
PCB Lamp Stabilizer (Mono) Stabilizes the exposure lamp power supply.