Ricoh D009 Service Manual page 1041

5. DETAILS
5.1 OVERVIEW
The basic fax unit consists of two PCBs: an FCU and an MBU.
The FCU controls all the fax communications and fax features, in cooperation with the
controller board. The MBU contains the ROM and SRAM. Also, the FCU has an NCU
circuit.
Fax Options:
1. Extra G3 Interface option: This provides one more analog line interface. This allows full
dual access. Two extra G3 interface options can be installed.
2. Memory Expansion: This expands the SAF memory and the page memory (used for
image rotation); without this expansion, the page memory is not big enough for image
rotation at 400 dpi, so transmission at 400 dpi is not possible.
SM 151
Overview
D346