24 Owner’s Manual
Wanco® Metro™ Message Sign
5.2.1 Display alarm
A display alarm indicates one or more of the sign’s display modules are not responding
properly. When a display alarm occurs, use the controller to run a diagnostic test on the
display modules.
If any module appears to be functioning improperly, or if LEDs fail to light, perform the
following steps to determine the cause. If no LEDs on a display module will light (i.e.,
the module appears not to be working), the cause could be faulty wiring or a loose
connection.
When a display alarm occurs:
1. Follow the safety requirements in Section 2, page 3.
2. Identify the malfunctioning display module and one that appears to be working
properly. Remember their locations.
3. Use the controller to “blank” the message sign.
4. Open the display cabinet door (which is hinged at the top and latched on the sides and
the bottom).
5. Before replacing a module, check its wiring connections:
a. Identify the malfunctioning module and locate the four retaining nuts that hold it
in place.
b. Using the supplied nut wrench or a 5/16-inch nut driver, remove the four nuts.
c. Carefully pull the display module away from the cabinet to expose the wiring
connections on back of the module. The wiring can be damaged if you use too
much force.
d. Check that the wiring connections are secure and properly connected.
6. If the connections are secure, remove two modules and switch their positions:
a. Being careful to avoid using too much force, first unplug the power connector on
back of the malfunctioning display module by pulling the connector straight out,
away from the module; then unplug the data input wires by pushing the locking
tab down and pulling the plug sideways, away from the connector. Repeat for the
data output wires. (The bottom-right module does not have output wiring.)
b. Set the malfunctioning display module aside.
c. Repeat the process to remove a properly functioning display module.
d. Reverse the procedure to install the functioning module where the malfunctioning
module used to be, then install the malfunctioning module where the properly
functioning module used to be.
IMPORTANT!
If more than one module is malfunctioning, always address “upstream” modules first,
working from left to right and top to bottom. When several modules exhibit problems,
it may be due to the first module in the sequence.
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