Signaltech TCL Series User manual

C Output LED
B Output
LED
+12V
LED
A Output
LED
Output
Connector B
Output
Connector A
Power Supply
Pigtail Connector
Output Power
to Sign Face
Sign Face
TCL Series Troubleshooting Guide
Tools Needed:
Philips head screwdriver
Multi-meter
Always turn off the power to the sign prior to opening the cabinet.
Disconnect the power wires going to the sign.
Note: Make appropriate wiring
connections per local codes.
Note: Clear all metal
chips created by drilling
into sign cabinet.
Note: Do not over-
tighten fasteners or
distort back panel.
Identify the Sign Problem: Pg
There are some
LEDs out 2
Pg
A message is lit
that shouldn’t be 3
Pg
The display is
ickering 4
Pg
The entire display
is out 5
Follow the owchart to diagnose the symptoms
Diagnostic LEDs are included on the internal power supply to aid in verifying that input power is present and is being transferred to
the sign face through the output connectors.
Description of Normal Operation for the Sign’s Internal Power Supply
Input Power
Pigtail Input Power
Pigtail
TCL Series 12-24VDC
+12V LED
This LED illuminates Green when 12-24VDC power is applied to the internal power supply’s input power pigtail.
Note: The transformer on the power supply converts 12-24VDC power to +12V.
A Output LED
Illuminates with power applied to Blue wire on the input power pigtail
B Output LED
Illuminates with power applied to Yellow wire on the input power pigtail
C Output LED
Illuminates with power applied to Red wire on the input power pigtail
Output Connectors
These connectors transfer power from the internal power supply to the sign face to
illuminate the individual message(s).
Last Update: 07/19/18

Problem: There are some LEDs out
TCL Series 12-24VDC
Please refer to the
diagrams on page 1.
There are some LEDs out
YES
NO
NO
NO YES
Check switches
and wiring
Supply is
defective and
needs replaced
Entire sign
needs replaced
< 10 LEDs Lit
Can you
measure the correct
incoming voltage
at the sign?
YES Output voltage
is > 12VDC?
Contact sales with
the serial number
of the sign
Pg
2
Last Update: 07/19/18

Problem: A message is lit that shouldn’t be
TCL Series 12-24VDC
A message is lit that should not be
Do the
wires run
parallel to other
high power
devices?
Run wires in
separate conduit
NO
Is there
incoming voltage
on that
channel?
YES
Recheck all
connections to
switches or
controlling system
Please refer to the
diagrams on page 1.
YES
NO
Contact sales with
the serial number
of the sign
Replace
power supply
Pg
3
Last Update: 07/19/18

Problem: Display is ickering
TCL Series 12-24VDC
Please refer to the
diagrams on page 1.
Display is ickering
YES
NO
NO
External power source may be AC
or it may not have adequate current
capacity to accommodate the sign’s
power supply inrush current
Check switches
and wiring
Supply is
defective and
needs replaced
Re-attach
connector
NO
YES
Is the
output connector
secure?
Contact sales with
the serial number
of the sign
Is the
+12V LED
illuminated
steady?
Pg
4
Last Update: 07/19/18

Contact sales with
the serial number
of the sign
Entire display is out
NO
YES
YES
YES
NO
Re-attach
connector
NO
YES
Is the
output connector
secure?
Is the
+12V LED
illuminated
steady?
Is the input
polarity correct?
Is the
output LED for
the aected message
illuminated?
Supply is
defective and
needs replaced
Check switches
and wiring
NO
Problem: Entire display is out
TCL Series 12-24VDC
Please refer to the
diagrams on page 1.
Can you
measure the correct
incoming voltage
at the sign?
Pg
5
Last Update: 07/19/18