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Machine Composition MINOLTAFAX 5600
2-4
2.3 NCU PWB
The NCU PWB provides the connection to the telephone line. It consists of the interface circuit, dial pulse
generator, ring signal detection and telephone control circuit.
NCU PWB block diagram
Major components of the NCU
CML relay
Connects the telephone line to the phone or fax. In standby mode it connects the line to the phone
unit.
H relay
Generates pulse signals in pulse dial mode.
OH detector
Detects the On-hook condition of the second telephone unit. In standby mode, the CML relay
connects the line to the phone unit.
24V generator
Supplies voltage for on-hook/off-hook detection for the fax unit.
Ring signal detector
A photocoupler is used to detect the ring signal.
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