Ricoh Mp C3000 Service Manual

Service RAM Addresses 
SM 119 B786 
B786 
Fax Option 
680394(H)  - Optional equipment (Read onl y – Do not change the settings) 
Bit 0: Page Memory    0:  Not installed, 1: Installed 
Bit 1: SAF Memory     0: Not installed, 1: Installed 
Bits 2 to 7; Not used 
680395(H)  - Optional equipment (Read onl y – Do not change the settings) 
Bits 0 to 3: Not used  
Bit 4: G3-2 0: Not installed, 1: Installed 
Bit 5: G3-3 0: Not installed, 1: Installed 
Bit 6 and 7: Not used 
680406 to 68040A  – Option G3 board...

Service RAM Addresses 
B786 120  SM 
688F0E(H) - Proxy server - Sub (Max. 128 characters - ASCII) 
688F8E(H) - Redirect server - Main (Max. 128 characters - ASCII) 
68900E(H) - Redirect server - Sub (Max. 128 characters - ASCII) 
68908E(H) - Registrar server - Main  (Max. 128 characters - ASCII) 
68910E(H) - Registrar server - Sub (Max. 128 characters - ASCII) 
68918E(H)  - Gatekeeper server address - Ma in (Max. 128 characters - ASCII) 
68920E(H ) - Gatekeeper server address - Sub (Max. 128 characters -...

Service RAM Addresses 
SM 121 B786 
B786 
Fax Option 
  
6BEC05(H)  – IMPORTANT:  Do not change the values
 of these RAM addresses. They 
are not for use in the field. 
6BEC06(H)  – IMPORTANT:  Do not change the values
 of these RAM addresses. They 
are not for use in the field. 
 
⇒  ⇒ 
Rev. 04/2007  

Overview 
B786 122  SM 
5.  DETAILED SECTION DESCRIPTIONS 
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 th e 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:...

Boards 
SM 123 B786 
B786 
Fax Option 
5.2 BOARDS 
5.2.1 FCU 
 
The FCU (Facsimile Control Unit) controls  fax communications, the video interface to the 
base copier’s engine, and all the fax options.. 
FACE3 (Fax Application Control Engine) 
ƒ CPU 
ƒ  Data compression and reconstruction (DCR) 
ƒ DMA control 
ƒ Clock generation 
ƒ  DRAM backup control 
Modem (FAME) 
ƒ  V.34, V33, V17, V.29, V.27ter, V.21, and V.8 
DRAM 
ƒ  The 16 MB of DRAM is shared as follows.  SAF memory        : 4MB 
Working memory...

Boards 
B786 124  SM 
5.2.2 MBU 
On this board, the flash ROM contains the FCU firmware, and the SRAM contains the 
system data and user parameters. Even if t he FCU is changed, the system data and user 
parameters are kept on the MBU board. 
ROM 
ƒ  3MB flash ROMs for system software storage   2MB (16bit x 1MB) + 1MB (16bit x 512K) 
SRAM 
ƒ  The 256KB SRAM for system and user para meter storage is backed up by a lithium 
battery. 
Memory Back-up 
ƒ  A lithium battery backs up the system parameters and...

Boards 
SM 125 B786 
B786 
Fax Option 
5.2.3 SG3 BOARD 
 
The SG3 board allows up to three simultaneous communications when used in 
combination with the FCU and optional G3 boards. The NCU is on the same board as the 
common SG-3 board. This makes the total board  structure smaller. But, the specifications 
of the SG3 board do not change. 
NCCP (New Communication Control Processor) 
ƒ  Controls the SG3 board. 
ƒ CPU (RU30) 
ƒ  DPRAM (Dual Port RAM): Handshaking with  the FCU is done through this block....

Boards 
B786 126  SM 
AFE (Analog Front End) 
ƒ Analog processing 
CODEC (COder-DECoder) 
ƒ  A/D & D/A conversions for modem 
REG 
ƒ  Generates +3.3 V from the +5V from the FCU  

Video Data Path 
SM 127 B786 
B786 
Fax Option 
5.3 VIDEO DATA PATH 
5.3.1 TRANSMISSION 
 
Memory Transmission and Parallel Memory Transmission 
The base copiers scanner scans t he original at the selected resolution in inch format. The 
BICU processes the data and tr ansfers it to the FCU. 
 
ƒ  When scanning a fax original, the BICU  uses the MTF, independent dot erase and 
thresholding parameter settings programmed  in the fax unit’s scanner bit switches, 
not the copiers SP modes. 
Then, the FCU...

Video Data Path 
B786 128  SM 
and/or reduces the data if necessary for transmission. The NCU transmits the data to the 
line. 
Immediate Transmission 
The base copiers scanner  scans the original at the reso lution agreed with the receiving 
terminal. The BICU video processes the  data and transfers it to the FCU. 
 
ƒ  When scanning a fax original, the BICU  uses the MTF, independent dot erase and 
thresholding parameter settings programmed  in the fax unit’s scanner bit switches, 
not the copiers SP...