Canon FAX-L350, Service Manual

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FAX-L350 Chapter 3: Maintenance and Service
b) G3 signal transmission test
The G3 signal transmission test menu is selected by pressing numeric button 4 from the MODEM NCU
test menu. The G3 signals 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
0 300 bps
1 2400 bps
2 4800 bps
3 7200 bps
4 9600 bps
5 TC7200 bps
6 TC9600 bps
7 12000 bps
8 14400 bps
The transmission level can be changed with the FUNCTION button then < and > button.
c) Tonal and DTMF signal reception test
The tonal and DTMF signal reception test is selected by pressing the
6
button from the MODEM NCU test
menu. This test checks whether the tonal signals and DTMF signals received from the modular jack are
detected by the modem.
NOTE
4 - 6 : TONE Rx 0 0 0
Tonal signal reception test
0 0 0
When 462
±
14 Hz signal detected, 0 1
When 1100
±
30 Hz signal detected, 0 1
When 2100
±
25 Hz signal detected, 0 1
DTMF signal reception test
4 - 6 : TONE Rx 0 0 0
The received DTMF signals are
displayed in order from the right on the
second line of the display.
1 2 3 4 5 6 7 8 9 0
Figure 3-21 Tonal and DTMF Signal Reception Test