Liu Pba - Samsung SCX-4720F Service Manual

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.
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Samsung Electronics
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Summary of Product
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
Service Manual
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