Summary of Product
Service Manual
4-23
Samsung Electronics
4.8.2 LIU PBA
The LIU board is the Line interface unit. It consists of a Tel_line Interface circuit and Telephone circuit.
The Tel_Line circuit consists of a matching transfer to conform to the impedance of the receiving telephone line and a
circuit to isolate the fax machine from the PSTN, and a surge absorber to protect against lighting strike surges on the
incoming line.
The Telephone circuit is consists of ring detection circuit, speech circuit, external hook detection circuit, and recall circuit.
4
5
6
2
3
1
1
TRANS MATCHING T1
2
TRANS MATCHING T2
3
RELAY RE1
4
VARISTOR VAR1/VAR2
5
JACK MODULAR(TEL) MJ1
6
JACK MODULAR(EXT) MJ2
Содержание SCX-4520
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