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Service Manual for OF5800
Chapter 2 Machine Operations
The NCU PCB provides the connection to the telephone line. It consists of the interface circuit, dial pulse
generator, ring signal detection and telephone control circuit.
NCU PCB block diagram
Major components of the NCU
CML relay
- Connects the telephone line to the phone or fax. (CML means Connect Machine to Line)
S relay
- Used to send dial pulse signals in pulse dialing.
OH detector
- Detects the On-hook condition of the second telephone unit.
H relay
- Connects the Tel1 and Tel2 lines to the fax machine.
CI Detector
- A photo coupler that detects an incoming ring. (CI means Call Indicator)
Voltage Circuit
- Supplies 24 volts to the relays
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)