32 Owner’s Manual
Wanco® Metro™ Message Sign
5.5 Controller
If the controller does not operate and:
■ The sign’s power system appears to be off (e.g., the display is blank and the controller
will not turn on), then the power system has shut down. For troubleshooting, see
Section 5.6, page 33.
■ The sign has power, see Table 5-9.
Table 5-6. Troubleshooting partial messages and duplicate characters
Possible cause Description Solution
Bad cables or connections Display module power or data cable
connections may be loose or broken
Test and, if necessary, replace defective cables or
display modules (see Section 5.2.1, page 24)
Faulty display modules One or more display modules may be
faulty
Test and, if necessary, replace defective display
modules (see Section 5.2.1, page 24)
Table 5-7. Troubleshooting stuck LEDs
Possible cause Description Solution
Short circuit LED or pixel driver may be shorted Examine display module for damage, debris, moisture,
or contact with metal on front or back of module (to
remove module from display, see Section 5.2.1, page 24)
Defective LED or driver LED or pixel driver may be faulty Test display module by swapping it with a properly
functioning module (see Section 5.2.1, page 24)
Table 5-8. Troubleshooting LED brightness problems
Possible cause Description Solution
Transparent window is dirty The polycarbonate window that
protects the display may be dirty
Clean the window (see Section 6.2.1, page 38)
Display position Apparent brightness can be affected
by the display position relative to
traffic
Ensure the message sign is properly located and
oriented (Section 4.4.1, page 16), and the trailer is
level (see Section 4.4.2, page 17)
Brightness settings Brightness settings control how bright
the display appears
Use the controller to check brightness settings;
change or restore defaults if necessary
Illumination control settings Illumination settings control dimming
of the display
Use the controller to check illumination control
settings; change or restore defaults if necessary
Table 5-9. Troubleshooting inoperable controller
Possible cause Description Solution
Ethernet cable The controller receives its power and
communicates with the message sign
computer using an Ethernet cable
Check cable connections at the controller and
computer box to ensure they are proper and secure;
replace the cable if damaged
Automatic shutoff After a period of inactivity, the
controller shuts down automatically
to save power
See the controller user-interface manual for on/off
operation
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