Oce 3121 Technical & Service Manual page 902

Relay test (RELAY)
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Press 'RELAY' on the MODEM NCU menu screen. Press ' OK ' to start re-
lay test mode, and to invoke the corresponding screen. A press on each item
will activate the appropriate relay.
Frequency test (FREQ)
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Press 'FREQ' on the MODEM NCU menu screen. Press ' OK ' to start the
frequency test mode, and to invoke the corresponding screen.
Select an item so that the frequency selected by closing the DC circuit will
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be transmitted, using the tone transmission function of the modem. Simulta-
neously monitoring the transmission signal from the speaker. To interrupt,
press the CANCEL key.
90 TSM Océ 3121 SDS Description