Service manual

COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
13-122
5. 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 Outline
Relay test Turn the selected relay on and off using the numeric
key pad.
Frequency test Output the tonal signal from the modem through the
telephone line connection terminal and the speaker.
G3 signal transmission test Output the G3 signal from the modem through the
telephone line connection terminal and the speaker.
DTMF signal reception test Output the DTMF signal from the modem through the
telephone line connection terminal and the speaker.
Tonal signal reception test 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.
V.34 G3 signal transmission test Output the V.34G3 signal from the modem through
the telephone line connection terminal and the
speaker.
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.
Figure 13-520
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.
Caution:
RELAY 1 010000
1-1 : P ON
1: RELAY ON
2: RELAY OFF
010000
RELAY CML P S H D R
Numeric key 0 1 2 3 4 5
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