Signal-Tech PHX Series, PHXF Series, SBL Series, SBLF Series Troubleshooting Manual

PHX(F) Series Troubleshooting Guide

PHX(F) Series 120-277VAC

Identify the Sign Problem:

Follow the owchart to diagnose the symptoms

Tools Needed:

Philips head screwdriver
Multi-meter

Dark band or area
when illuminated

Pg

A message is lit
that shouldn’t be

2

Pg

The display is
ickering

3

Always turn off the power to the sign prior to opening the cabinet.
Disconnect the power wires going to the sign.

Note: Clear all metal
chips created by drilling
into sign cabinet.

Note: Do not over­tighten fasteners or
distort back panel.

Pg

4

Note: Make appropriate wiring

connections per local codes.

Last Update: 07/19/18

The entire display
is out

Description of Normal Operation for the Sign’s Internal Power Supply

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.

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.

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.

Pg

5

Neutral

Line

Power Supply

Power Supply

120-277VAC

Single Message with Multiple Power Supply Example

Power Interconnect

(Factory installed) Power Supply

V Out LED Output ConnectorOutput Connector

Power Interconnect

(Factory installed) Power Supply Input Power Pigtail

Neutral (White Wire)

V Out LED

SPST
On/Off Switch

Message A Lead
(Black Wire)

Input Power

Pigtail

Sign Face

Output Power to Sign Face

Problem: Dark band or area when message is illuminated

PHX(F) Series 120-277VAC

There is a dark band or dark area when

message is illuminated

Do some

areas of the sign

face appear dark when

illuminated?

Last Update: 07/19/18

Please refer to the

diagrams on page 1.

YES

Entire sign

needs

replaced

Contact sales with

the serial number

of the sign

Pg

2

Problem: A message is lit that shouldn’t be

PHX(F) Series 120-277VAC

A message is lit that should not be

Do the

wires run

parallel to other

high power

devices?

NO

YES

Last Update: 07/19/18

Please refer to the

diagrams on page 1.

Run wires in

separate conduit

Is there

incoming

voltage on that

channel?

NO

Replace

power supply

YES

Recheck all

connections to switches

or controlling system

Contact sales with

the serial number

of the sign

Pg

3

Problem: Display is ickering

PHX(F) Series 120-277VAC

Display is ickering

Is the

V Out LED

illuminated

steady?

NO

Last Update: 07/19/18

Please refer to the

diagrams on page 1.

Check switches

and wiring

YES

Is the

output connector

secure?

NO

Re-attach

connector

YES

Supply is

defective and

needs replaced

Contact sales with

the serial number

of the sign

Pg

4

Problem: Entire display is out

PHX(F) Series 120-277VAC

Entire display is out

Is the

V Out LED

illuminated?

YES

Is the

output LED for

the aected message

illuminated?

NO

NO

YES

Can you measure

the correct incoming

voltage at the sign?

YES

Last Update: 07/19/18

Please refer to the

diagrams on page 1.

NO

Check switches

and wiring

Are the input

connectors and

pigtail secure?

YES

NO

Is the

output connector

secure?

NO YES

Re-attach
connector

YES

Supply is

defective and

needs replaced

Contact sales with

the serial number

of the sign

Pg

5