Modem And Ncu Tests - Canon MultiPASS C755 Service Manual

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
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
NOTE
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
Frequency
462 Hz
1100 Hz
1300 Hz
1500 Hz
1650 Hz
1850 Hz
2100 Hz
The transmission levels for each frequency follow the service data transmission level
settings.
3-64