Ricoh G165 Service Manual page 217

MF Model
EGB (Engine Board):
This controls the Engine, the controller interface, image processing, MUSIC (Mirror
Unit for Skew and Interval Correction), input/output, interfaces with the optional units,
and the operation panel. MUSIC is also called Automatic Line Position Adjustment).
Controller:
This controls the interface between the OPU and EGB, ADF, Scanner unit and
applications. The controller connects to the EGB through the PCI Bus (Peripheral
Component Interconnect Bus).
LD Drive Board:
This is the laser diode drive circuit board.
Memory DIMM (Standard: 128MB (MF1a/b), 256MB (MF1c), Option: 256MB):
This is for more printer processing memory, and is also used for collation and for soft
fonts.
OPU (Operation Panel Unit):
This controls the display panel, the LED, and the keypad.
SM 6-9 G165/G166/G167/G181/G183/G184
Machine Overview