Standard Boards (Rear) - Ricoh D124 Detailed Descriptions Manual

8.1.3 STANDARD BOARDS (REAR)

Here is a brief description of functions of the important boards:
CTL (GW Controller)
Performs overall control of all multi-function peripheral (MFP) devices.
MB (Mother Board)
The MB is mounted sideways at the edge of the controller board. Provides important
relay functions 1) for the Rapi Bus I/F between the IPU, GW controller, and file format
converter, and 2) for machine power supply. The standard mother board must be
replaced with a larger mother board if the file format converter is installed.
IPU (Image Processing Unit)
The IPU controls image processing. It is only partially visible with the rear cover
removed because it is mounted behind the MCU.
MCU (Main Control Unit)
This is the engine control board. The MCU manages:
 Base engine control, scanning control, image processing control, image writing
control.
 Basic I/O function control for the power packs, motors, sensors, solenoids, and
clutch.
 The CHOPIN module on the MCU controls DSP (Digital Signal Processing). DSP
control processes the encoder readings of the following modules and controls
their operation:
 Carriage unit (from the horizontal encoder strip)
 Vertical motor (from the vertical encoder wheel)
 Roll paper feed (from the encoder in the roll feed unit)
D124
CTL Controller Board
MB Mother Board
IPU Image Processing Unit
MCU Main Control Unit
PSU Power Supply Unit
160 Detailed Descriptions