GAI-Tronics ICP9000 Navigator Series Console Installation and Service Manual - Manual (Page 79)

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Troubleshooting
The following is a list of potential problems you may encounter and possible solutions.
Problem Possible Solution
There is partial or no
communications between
the MCU and the PC. Ensure that the proper COM port is selected within the Navigator
application.
Ensure that the PC is connected to the MCU properly:
RS-232 to RS-232, if connected directly to the PC.
RS-485 to RS-485/RS-232 converter if using the RS-485 port of the MCU.
Ensure that the NULL MODEM jumpers are set correctly on the MCU
interface card if using RS-232.
There is little/no
select/unselect audio from
the PC. Ensure the volume sliders on the Navigator screen are at a reasonable level.
Ensure the PC speakers have power and both the speakers and soundcard
are functioning using another windows application.
Ensure the select and unselect audio connections between the MCU and the
PC soundcard are proper.
Ensure that an accessory is not off-hook and forcing the select speaker to be
muted.
There is low or no mic
audio. Ensure the setting of the mic and its level in the Mic Selection/Level Menu.
If using an audio accessory box, ensure that the audio accessory box is
functioning correctly and that automatic mic selection is not enabled and
the desk/handset/headset mic is selected.
Ensure the microphone is functioning correctly by connecting to another
device.
Communications appears
normal, but the Navigator
buttons do not respond. Ensure that an accessory mic does not have a contact closed/opened. The
console reads the state of the monitor input of the accessory port P9
immediately following reset.
If the input is closed or low, the input is assumed to be normally closed and
go high upon assertion.
If the input is opened or high, the input is assumed to be normally opened
and go low upon assertion. If an accessory is connected after the MCU is
powered up, perform a hardware reset to ensure the proper behavior of this
input.