Detailed Section Descriptions; Overview - Ricoh J-CF Service Manual

Fax unit

Table of Contents

21 December, 2001

4. DETAILED SECTION DESCRIPTIONS

NCU

SG3

SIG4

NCU

The basic fax unit consists of two PCBs: an FCU, an MBU and an NCU.

The FCU controls all the fax communications and fax features, in cooperation with

the controller board. The MBU contains the ROM and SRAM. 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. Only one extra G3 interface option can be installed. The

optional G3 unit consists of two PCBs: G3 board and NCU.

NOTE: Either an extra G3 interface option or an ISDN unit can be installed.

2. ISDN unit: This allows the fax unit to communicate over an ISDN line.

NOTE: Either an extra G3 interface option or an ISDN unit can be installed.

3. 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.

4. 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.

Fax Function

Upgrade

CCUIF

Expansion

4-1

FCU

MBU

Memory

OVERVIEW

IPU

G307D501.WMF

Table of Contents

G307