Signaltech SBL Series User manual

SBL(F) Series Troubleshooting Guide
Power Supply
Output Power to Sign Face
Sign Face
SBL(F) Series 120-277VAC
Message A Lead
(Black Wire)
Neutral
120-277VAC
Line
Neutral (White Wire)
SPST
On/Off Switch
Single Message with Multiple Power Supply Example
Power Interconnect
(Factory installed) Power Supply
Power Supply
Input Power
Pigtail
V Out LED
V Out LED Output ConnectorOutput Connector
Power Interconnect
(Factory installed) Power Supply Input Power Pigtail
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.
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
V Out LED
This LED illuminates Green when 120-277VAC power is applied to the internal power supply’s input power pigtail.
Note: The transformer on the power supply converts 120-277VAC power to +12V.
Identify the Sign Problem: Pg
Darkband orarea
whenilluminated 2Pg
Amessage is lit
thatshouldn’tbe 3Pg
Thedisplayis
ickering 4Pg
Theentire display
isout 5
Follow the owchart to diagnose the symptoms
Output Connectors
These connectors transfer power from the internal power supply to the sign face to illuminate the individual message(s).
For signs with one message and one power supply, the V Out LED should illuminate green when the message is powered. For signs with
multiple message and/or multiple power supplies, the V Out LED on each power supply of the energized message should illuminate.
Note: A longer single message may require multiple power supplies to illuminate the entire message.
Last Update: 07/16/20

Problem: Dark band or area when message is illuminated
There is a dark band or dark area when
message is illuminated
Please refer to the
diagrams on page 1.
SBL(F) Series 120-277VAC
Pg
2
Contact sales with the serial number of the sign,
and be prepared with other relevant information:
• Input voltage reading from multimeter.
• Output voltage of power supply.
• Photos/video showing the issue/damage.
• Photos of the inside of the sign, showing the
wiring and power supplies.
Entire sign
needs
replaced
YES
Do some
areas of the sign
face appear dark when
illuminated?
Last Update: 07/16/20

Problem: A message is lit that shouldn’t be
A message is lit that should not be
Please refer to the
diagrams on page 1.
SBL(F) Series 120-277VAC
Pg
3
Contact sales with the serial number of the sign,
and be prepared with other relevant information:
• Input voltage reading from multimeter.
• Output voltage of power supply.
• Photos/video showing the issue/damage.
• Photos of the inside of the sign, showing the
wiring and power supplies.
YES Run wires in
separate conduit
NO
NO
YES Recheck all
connections to switches
or controlling system
Do the
wires run
parallel to other
high power
devices?
Is there
incoming
voltage on that
channel?
Replace
power supply
Last Update: 07/16/20

Problem: Display is ickering
Display is ickering
Please refer to the
diagrams on page 1.
SBL(F) Series 120-277VAC
Pg
4
Contact sales with the serial number of the sign,
and be prepared with other relevant information:
• Input voltage reading from multimeter.
• Output voltage of power supply.
• Photos/video showing the issue/damage.
• Photos of the inside of the sign, showing the
wiring and power supplies.
YES
NO
Supply is
defective and
needs replaced
Re-attach
connector
NO
YES
Is the
V Out LED
illuminated
steady?
Is the
output connector
secure?
Check incoming
voltage, power
source, switches
and wiring
Last Update: 07/16/20

Problem: Entire display is out
Entire display is out
Please refer to the
diagrams on page 1.
SBL(F) Series 120-277VAC
Pg
5
Contact sales with the serial number of the sign,
and be prepared with other relevant information:
• Input voltage reading from multimeter.
• Output voltage of power supply.
• Photos/video showing the issue/damage.
• Photos of the inside of the sign, showing the
wiring and power supplies.
NO
YES YES
Re-attach
connector
Is the
output connector
secure?
Is the
V Out LED
illuminated
on the aected
power supply?
Can you measure
the correct incoming
voltage at the sign?
Supply is
defective and
needs replaced
NO
YES YES
Are the input
connectors and
pigtail secure?
Check power
source, switches
and wiring
NO
Last Update: 07/16/20