Canon MF735C Series Service Manual page 343

9. Service Mode
TESTMODE (Service mode for test print, operation check, etc.) > FAX (FAX test mode) > MODEM
DTMFTX DTMF transmission test
Detail To test whether the specified DTMF signal is transmitted.
By closing or opening the DC circuit in accordance with the setting value, the specified DTMF
signal is transmitted by the DTMF transmission function of the modem.
Check this with the speaker.
Adj/Set/Operate Method Enter the setting value, and then press Apply key.
Caution Be sure to set the value back to 0 after the test.
Display/Adj/Set Range 0 to 12
0: OFF
1: 1
2: 2
3: 3
4: 4
5: 5
6: 6
7: 7
8: 8
9: 9
10: 0
11: *
12: #
Default Value 0
Supplement/Memo
DTMF (Dual Tone Multi Frequency): Signal method combining two specific frequencies like a push-
tone phone.
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