Detailed Section Descriptions; Overview - Ricoh B121 Service Manual

Rev. 04/2004

4. DETAILED SECTION DESCRIPTIONS

4.1 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.
⇒
Important Notes for Installing the Optional FAX Feature
Please be sure to keep the following in mind when installing the optional FAX:
1. After changing the bit SW setting for the country code (system switch 0F), do
not use the scroll key to go to the next bit setting. Instead, turn the main power
ON/OFF to activate the country code setting, and then go on to the next
settings.
If the scroll key is used just after the country code is set, other bits may be
changed.
2. When installing the FCU, slowly and carefully connect the MBU to the FCU to
ensure a proper connection.
If the connection is not properly established, the FAX option may not be
detected and/or an SC820 may occur.
SM
FCU
MBU
73
OVERVIEW
Controller
B620D902.WMF
B620