Canon MultiPASS C755 Service Manual - Page 115

Modem and NCU tests, The V.34 modem sends G3 signals from the modular jack

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MultiPASS C755 Chapter 3: Maintenance & Service 7.2.6 Modem and NCU tests 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 Frequency test G3 signal transmission test V34 signal transmission test Overview The modem sends tone signals from the modular jack and the speaker. The modem sends G3 signals from the modular jack and the speaker. The V.34 modem sends G3 signals from the modular jack and the speaker a) Frequency test The frequency test menu is selected by pressing the 2 button 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 1 2 3 4 5 6 7 Frequency 462 Hz 1100 Hz 1300 Hz 1500 Hz 1650 Hz 1850 Hz 2100 Hz NOTE The transmission levels for each frequency follow the service data transmission level settings. 3-64

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3-64
MultiPASS C755
Chapter 3: Maintenance & Service
7.2.6 Modem and NCU tests
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 tone signals from the modular jack and the
speaker.
G3 signal transmission test
The modem sends G3 signals from the modular jack and the
speaker.
V34 signal transmission test
The V.34 modem sends G3 signals from the modular jack and
the speaker
a) Frequency test
The frequency test menu is selected by pressing the
2
button 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
The transmission levels for each frequency follow the service data transmission level
settings.
NOTE