Modem Ncu Test <4:Modem Ncu - Canon GP160DF Service Handbook

6. MODEM NCU test <4: MODEM NCU>
Runs transmission and reception tests for the MODEM and NCU. For the modem
test, checks whether the modem's transmission signal is being properly transmitted by
checking the signal sound from the speaker. Also checks whether the received tonal sig-
nal and DTMF signal were properly detected by the modem. The test ends when the
stop key is pressed.
Type
Relay test
key pad.
Frequency test
G3 signal transmission test
DTMF signal reception test
Tonal signal reception test
V.34 G3 signal transmission test
a) Relay test
When 1 on the numeric key pad in the MODEM NCU TEST menu is pressed, the
relay test is selected.
The NCU relays are operated by the numeric key pad.
:
Caution
ON/OFF on the display indicator is displayed for the relay operation signal transmis-
sion by operation of the numeric key pad. Therefore, it is not possible the verify that a
single relay unit is damaged by looking at the display.
Outline
Turn the selected relay on and off using the numeric
Output the tonal signal from the modem through the
telephone line connection terminal and the speaker.
Output the G3 signal from the modem through the
telephone line connection terminal and the speaker.
Output the DTMF signal from the modem through the
telephone line connection terminal and the speaker.
Put the specific frequency received from the tele-
phone line connection terminal and the DTMF signal
through the modem and display whether or not they
are detected. The received signal is output from the
speaker.
Output the V.34G3 signal from the modem through
the telephone line connection terminal and the
speaker.
RELAY 1
1-1 : P
0 1
RELAY CML P
Numeric key 0 1
010000
ON
0 0 0 0
S H D R
2 3 4 5
Figure 4-20
CHAPTER 4 SERVICE MODE
1: RELAY ON
2: RELAY OFF
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