Fax1 Board - Minolta Di251f Service Manual

C. Image memory (DRAM FILE)
• Standard system has a TMEM board (32 MB) on the MFB2 board CN5.
• The maximum capacity is 64MB by installing another ROT board and a TMEM board on
the CN6.
Installing board
25 / 35 CPM
D. Printer controller (FCUE LSI)
• It processes the line density conversion for print image data (serial data) from the storage
decoder, and stores it in the internal frame memory.
• The converted data is read synchronized with the PPC printer, added information on the
left margin and the white mask, and then output to the printer as serial data.
• The frame memory can hold up to 20 Kbit of data to be output to the printer.
• The printer controller exchanges commands/statuses for controlling the printer unit.
E. Communication controller (FCUE LSI and IPUS LSI)
• This controller performs necessary functions (relay control, ringer detection, line connec-
tion detection, polarity reverse detection, dialing and pulse sending) for G3 communica-
tion.
• It also detects the frequency of the tonal signal of G3 communication.
3-2.

FAX1 Board

• This board comes loaded with a G3 modem for communicating V.34 facsimile communi-
cations.
• It also possesses clock IC circuit, SRAM circuit for storing different types of registration
information, battery back-up circuit for file memory, program ROM (mask ROM: 16MB)
and optional I/F for different types of communication systems.
• This item describes functions other than for the FAX1 board described in the MFB2
board.
1. Modem (V.34 modem)
• This modem is configured with a digital signal processor, analog front-end that converts
A/D and D/A, modem F/WROM and Book memory (SRAM).
• It conforms to electrical communications conditions provided in recommended V.8, V.34,
V.17, V.29, V.27ter, V.21ch2, T.3, and T.4. It also follows the T.30 binary signal procedure.
The transmission speeds are 33600, 31200, 28800, 26400, 24000, 21600, 19200,
16800, 14400, 12000, 9600, 7200, 4800, 2400, and 300 bps.
• It also transmits PB tones when calling PB. This modem is positioned on the memory
map on the MFB2 board.
2. Communication controller (FCUE LSI and IPUS LSI)
• It achieves relay controls, ringer detection, closed DC line wire connection detection and
dial pulse functions.
• It also detects tonal frequencies in G3 procedures.
3. Image memory backup circuit
• It maintains memory capacity by switching the power supply when the device power is
OFF or during a power failure from the battery for a maximum image memory of 64MB.
memory capacity
TMEM
M-9
32 MB