Ricoh AC205 Service Manual - Page 174

Usb Host, Fax Modem, Liu Pba, 8.1 Modem, 8.2 Liu Pba

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USB HOST 6.7 USB HOST The USB Host PBA provides power to the USB connector. This enables the USB memory drive to use the following functions: • Direct printing • Scan to USB functions 6.8 FAX SECTION 6.8.1 MODEM • Group 3 facsimile modem • External handset support (not supported on this machine) • Requires Discrete Line Interface Unit (LIU ) • V.34 Half-Duplex Mode (modulation method used at Fax transmission) • V.90 PCM/V.34 Duplex Data Modes (data modem only) 6.8.2 LIU PBA The LIU board is the line interface unit and consists of the following: • Tel_line • Interface circuit • Telephone circuit The Tel_Line circuit consists of the following: • A matching transfer to conform to the impedance of the receiving telephone line • A circuit to isolate the fax machine from the PSTN • A surge absorber to protect against lighting strike surges on the incoming line The Telephone circuit consists of the ring detection circuit, speech circuit, external hook detection circuit, and recall circuit. B273 6-20 SM

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USB HOST
B273
6-20
SM
6.7 USB HOST
The USB Host PBA provides power to the USB connector. This enables the USB
memory drive to use the following functions:
•
Direct printing
•
Scan to USB functions
6.8 FAX SECTION
6.8.1 MODEM
•
Group 3 facsimile modem
•
External handset support (not supported on this machine)
•
Requires Discrete Line Interface Unit (LIU )
•
V.34 Half-Duplex Mode (modulation method used at Fax transmission)
•
V.90 PCM/V.34 Duplex Data Modes (data modem only)
6.8.2 LIU PBA
The LIU board is the line interface unit and consists of the following:
•
Tel_line
•
Interface circuit
•
Telephone circuit
The Tel_Line circuit consists of the following:
•
A matching transfer to conform to the impedance of the receiving telephone
line
•
A circuit to isolate the fax machine from the PSTN
•
A surge absorber to protect against lighting strike surges on the incoming line
The Telephone circuit consists of the ring detection circuit, speech circuit, external
hook detection circuit, and recall circuit.