Modem And Ncu Tests - Canon PC-D320 Service Manual

6.6 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
Frequency test
G3 signal transmission test
Tonal signal/DTMF signal reception
tests
V.34 G3 signal transmission test
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
1
2
3
4
5
6
7
PC-D320/PC-D340/FAX-L400 Chapter 4: Maintenance and Service
Overview
The modem sends tonal signals from the modular
jack and the speaker.
The modem sends G3 signals from the modular
jack and the speaker.
The modem detects specific frequencies and
DTMF signals received from the modular
jack.
The modem sends V.34 G3 signals from the
modular jack and the speaker.
Frequency
462 Hz
1100 Hz
1300 Hz
1500 Hz
1650 Hz
1850 Hz
2100 Hz
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