AX Quikstart Guide
Pg. 11
• AX-CEU Power LED ashing:
Possible incorrect program setting for the Central Exchange Unit. If there is no add-on exchange (AX-320C),
make sure the program setting for No. 2 through No. 4 is set to “Not Connected”. If these are set to “Connected”
but no add-on is connected to the main CEU, the power LED will ash.
• Audio-only system, door station squeals when station is selected:
Possible power supply connection issue. In an audio-only system with one PS-2420UL, the power terminals must
be commoned together on the AX-CEU. Refer to the bottom of Page 9.
• Error message while downloading program to CEU “Error occured while downloading the setting le”:
1. Power not applied to CEU: Make sure that there is power applied to both the V+ V- and D+ D- on the exchange
and that the power LED is on bright when the power switch is in the ON position.
2. System is currently in use: If there is any current activity on the exchange, such as a master monitoring a door,
then the system will not accept programming information. To ensure no activity, unplug the RJ-45 connections
from the CEU and only leave power and the programming cable connected.
3. Check the serial cable being used. If using the provided USB-to-Serial converter cable, make sure that the
drivers were installed on your PC (see page 2).
• One of the master station LED’s is blinking on the AX master:
When a master station is programmed to be in the system and that station gets unplugged or disconnected in
some way, the corresponding master LED will blink quickly on the other master station(s) that are still connected
indicating that there is a problem. Check the wiring to the master station assigned to the channel with the blinking
LED and reconnect appropriately.
• Video master station still displays video even when a substation is not programmed to call it:
This is not a malfunction. Assigning a substation to only call certain masters simply eliminates it from
annunciating (no call tone) at that particular master. Other functions, such as the LED blinking, the monitor
coming on, or the master being able to call that substation are still functional.
• AX master not able to hear the door station (stuck in Transmit mode):
Check to see if the 6-pin connector is plugged into the back of the AX master unit. If the blue and green wires are
shorted together, separate them. The blue and green wires are for connection of a footswitch to activate the TALK
function and if shorted together, the master will be stuck in transmit mode.
• If you are having communication issues, it is recommended to bench test the AX-CEU with the masters and doors
using patch cables to insure that the product is functioning normally.
Basic Troubleshooting:
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