LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
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6.5 Modem and NCU Tests
The Modem and NCU Test menu is selected by pressing the numeric button 4 from the test
mode menu. These tests test modem and NCU transmission and reception. The modem tests
check whether signals are sent correctly from the modem by comparing the sound of the signals
from the speaker with the sounds from a normal modem. Also, you check on the display
whether or not the modem correctly detected received tone signals and DTMF signals.
End this test by pressing the Stop button.
Modem test type Overview
Frequency test The modem sends tonal signals from the modular
jack and the speaker.
G3 signal transmission test The modem sends G3 signals from the modular
jack and the speaker.
Tonal signal/DTMF signal reception The modem detects specific frequencies and
tests DTMF signals received from the modular
jack.
V.34 G3 signal transmission test The modem sends V.34 G3 signals from the
modular jack and the speaker.
a) Frequency test
The frequency test menu is selected by pressing the numeric button 2 from the MODEM
NCU test menu. Signals of the frequencies below are sent from the modem using the
modular jack and the speaker. The frequency can be changed with the numeric buttons.
Numeric button Frequency
1 462 Hz
2 1100 Hz
3 1300 Hz
4 1500 Hz
5 1650 Hz
6 1850 Hz
7 2100 Hz
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