Canon FAX-B820 Service Manual page 46

b) G3 signal output test
In the MODEM, NCU test menu, press numeric button '2' and the G3 signal output test is selected.
A G3 signal is output from the modem via the telephone line connection terminal and the speaker.
The transmission speed can be changed using the numeric buttons.
Numeric button
0
1
2
3
4
5
6
7
8
*The output level for each frequency depends on the service data output level settings.
c) Tone signal RX test
In FAX MODEM TEST menu, press numeric key 3 to select Tonal Signal RX Test.
This test checks that modem detects tonal signal sent via telephone line terminal.
Method:
1) Prepare another machine and connect its telephone line terminal with that of machine under test
using modular jack.
2) Both machines: enter FAX MODEM TEST menu.
3) Machine under test: select [Tone Signal Reception Test] mode.
4) Other machine: select [Frequency Test] mode, and set the machine to send out 1100 Hz (CNG)
and 1300 Hz (FC).
5) Machine under text: check if the machine can detect 1100 Hz (CNG) and 1300 Hz (FC) sent from
the other machine.
Tone Signal Reception Test
001
n=None: when the machine detects 1300 Hz signal
n=5 : when the machine detects DTMF 5
n=56 : when the machine detect 6 following DTMF 5
Figure1-13 Tonal Signal Reception Test
Speed
300 bps
2400 bps
4800 bps
7200 bps
9600 bps
TC7200 bps
TC9600 bps
12000 bps
14400 bps
n
1-41