Canon LASER CLASS 730i Service Manual page 159

LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
c) Tonal and DTMF signal reception tests
The tonal and DTMF signal reception test is selected by pressing the numeric button 6 from
the MODEM NCU test menu. In these tests, you can check whether the tonal signals and
DTMF signals received from the modular jack are detected by the modem.
The 462Hz test is included because the modem has a 462Hz detection function.
Figure 4-28 Tonal and DTMF Signal Reception Tests
Tone signal reception test
4-6: TONE Rx
0 0 0
When 1300 Hz signal detected, 0 to 1
When 440 Hz signal detected, 0 to 1
When 1100 Hz signal detected, 0 to 1
DTMF signal reception test
4-6: TONE Rx
1 2 3 4 5 6 7 8 9 0
The received DTMF signals are displayed in order
from the right on the second line of the display.
4-76
0 0 0
0 0 0