Ricoh B079, Service Manual

Page: 826 / 948

OVERVIEW
B547 118 SM
4. DETAILED SECTION DESCRIPTIONS
4.1 OVERVIEW
The basic fax unit consists of two PCBs: an FCU and an NCU.
The FCU controls all the fax communications and fax features, in cooperation with
the controller board. The NCU switches the analog line between the fax unit and
the external telephone.
Fax Options:
1. Extra G3 Interface option: This provides one more analog line interface. This
allows full dual access. Up to two extra G3 interface options can be installed.
The option G3 unit consists of two PCBs: G3 board and NCU.
2. Fax Function Upgrade Unit: JBIG compression becomes available. In addition,
this expands the system’s SRAM capacity to hold programmed telephone
numbers, memory files, etc.
3. 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.
NCU
NCU
FCU
Fax Function
Upgrade
CCUIF
G3
G3
Expansion
Memory
MB
Controller
B360V501.WMF