EGB (Engine Board)
This controls the engine, the controller interface, image processing, MUSIC (Mirror Unit for Skew and Interval Correction), input/output, and interfaces with the optional units. MUSIC is also called Automatic Line Position Adjustment.
CTL (Controller Board)
This controls the interface between the OPU and EGB, and applications.
PSU (Power Supply Unit)
This unit supplies the DC voltages to the machine.
HVP (High Voltage Power supply)
This unit converts DC voltage to high-voltage supplies.
New PCDU Detection Board
This unit detects when a new PCDU is installed, and whether each PCDU has been set.
USB Board
Connects the USB memory.
ID Chip Relay Board
Relays the data from the ID Chips of the Toner cartridges.
DC Switch
Turns the DC voltage supply on/off
Toner End Detection Board
This unit detects the amount of remaining toner.
Fax Board
Controls the fax program.
Wireless LAN
Controls the wireless LAN communication.
NFC
Controls NFC (Near Field Communication).
This board is used only for RICOH Smart Device Connector.
Operation Panel Relay Board
A relay board unique for each model is installed, so that other models can use the same operation panel unit.
OPU
Controls the operation panel. For details, see the service manual for Smart Operation Panel 2nd Generation.
SPDF Relay Board
This is a relay board for the document feeder.