No. Function On\OFF Comment
1 DFU OFF
2 DFU OFF
3 DFU OFF
4 DFU OFF
DFU: Design, Factory Use only. Do not change these settings.
MB (Mother Board)
Interfaces the Controller, BICU, and optional devices such as key counters.
HDD (Hard Disk Drive)
The HDD has a capacity of 40 GB for image storage. It can store up to approximately 1,735 copy images,
based on the ITU-T No. 4 Chart.
The HDD for the B148 has 80 GB capacity.
An SC is logged if the HDD is abnormal or cannot be detected. After pressing a key to affirm that you have
read the message, the machine shuts down partially but can still be used. However, some features may
not be available.
Note the following important points regarding HDD replacement:
• All document server files are lost after the HDD is replaced.
• The “Scan to Email” addresses are also lost by HDD replacement. However, addresses can be backed
up with SmartNetMonitor.
OPU (Operation Panel Unit)
Controls operation of the operation panel display and operation keys.
GW Controller
This machine employs Ricoh GW (Grand Work) architecture. The controller controls all devices for memory
DIMMs, HDD, printing, etc. In order to add an option, the appropriate DIMM, interface board, or SD
card must be installed on the controller board. All Controller DIP SWs should be OFF during normal
operation.
DRB (Drive Board)
Drives the duplex stepper motors (x2), the registration motor, and lower relay motor.
PFC (Paper Feed Control)
Controls the paper feed IOB (Input/Output Board): The IOB handles the following functions: (1) Drive
control for the sensors, motors, and solenoids of the main unit, (2) PWM (pulse width modulation) control
for the high voltage supply board, (3) Serial interface with peripherals, (4) Fusing control. trays built into
the main machine. The PFC contains an independent CPU.
Board Structure
439
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