Canon iR1600 Informazioni Techniche Scaricare il pdf (Pagina 676)

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2002 CANON INC. CANON FAX BOARD REV.0 MAR. 2002

2-4

CHAPTER 2 BASIC OPERATION

1.4 Functions

a.G3 Multiport PCB

Communication Control Block

The communication control block is designed to detect circuit signals (e.g., CNG,

DTMF). It also uses the CPU on the image processor PCB to control the 33.6Kbps mo-

dem, thus modulating or demodulating transmission/reception data.

Memory Function

The 16MB (as mounted) SDRAM used for the storage of image data is capable of stor-

ing image data equivalent of about 100 pages (about 2 MB) of Canon FAX Standard Chart

No. 1. The image data is backed up by a vanadium lithium secondary battery for as long

as 1 hr in the event of a power shortage. The 128KB SRAM, on the other hand, is used to

back up registered data (user data, service data), and its contents are backed up by means

of a lithium battery when the machine is turned off (as long as 5 yr).

Image Storage DIMM Slot (option)

The RAM-DIMM (32MB x 2) fitted to the slot is used for storage of data for transmis-

sion and reception.

b.NCU PCB

2-line/4-line Conversion Circuit

The 2-line signal from the telephone line is converted into 4-line signals (transmission

signal and reception signal): it also prevents the transmission signals from the modem

from coming into the reception circuit.

Dial Pulse Generating Circuit

The dial pulse generating circuit is designed to generate dial pulses by turning on and

off the relay in the circuit, thus detecting dial signals from the fax over the telephone line.

Off-Hook Detection Circuit

When the telephone connected to the telephone terminal or the handset (option) is in

off-hook state, the direct circuit flowing to the circuit is detected to find out if the system

is in off-hook state.

Line Voltage Conversion Circuit

The primary side of the NCU PCB is controlled by a circuit voltage of +48 VDC; its

DC component is cut, and only the voice signals are converted to modem-level voltages.

c. Modular PCB

Telephone Line Interface

The signals from the 3 modular jacks (for telephone line, for telephone connection, for

option handset) is forwarded to the line voltage conversion circuit of the NCU PCB,

thereby communicating the signals from the fax to the telephone line.

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Canon iR1600 Informazioni Techniche Pagina 676

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