Federal Signal Corporation CN SignalMaster FSJoin Manual

25500678
REV. A0 1120
Printed in U.S.A.
© Copyright 2020 Federal Signal Corporation
Installation, Maintenance,
and Service Manual
CN SignalMaster™FSJoin™

blank page
Limited Warranty
This product is subject to and covered by a limited warranty,
a copy of which can be found at www.fedsig.com/SSG-Warranty.
A copy of this limited warranty can also be obtained by written
request to Federal Signal Corporation, 2645 Federal Signal Drive,
University Park, IL 60484, email to [email protected] or
call [phone].
This limited warranty is in lieu of all other warranties, express or
implied, contractual or statutory, including, but not limited to the
warranty of merchantability, warranty of tness for a particular
purpose and any warranty against failure of its essential purpose.
2645 Federal Signal Drive
University Park, Illinois 60484-3167
www.fedsig.com
Customer Support
Police/Fire-EMS: 800-264-3578 • [phone]
Work Truck: 800-824-0254 • [phone]
Technical Support 800-433-9132 • [phone]
All product names or trademarks are properties of their respective owners.

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Federal Signal www.fedsig.com
Contents
Safety Messages for Installers and Service Personnel ............................................................... 4
Safety Messages for Operators of Warning Lights ...................................................................... 7
An Overview of the CN SignalMaster™.......................................................................................................9
LED Lights, Colors, and Flash Patterns......................................................................................................9
FSJoin .................................................................................................................................................................9
Installing the CN SignalMaster..................................................................................................... 10
Mounting the CN SignalMaster™.................................................................................................................10
Wiring the CN SignalMaster™in the Vehicle ............................................................................................ 11
Wiring the SignalMaster™Function ...................................................................................................... 12
Wiring the Light Bar Controls................................................................................................................ 12
Setting Configuration Options.................................................................................................................... 14
Testing the Light Bar ..................................................................................................................................... 15
Maintaining and Servicing the CN SignalMaster™...................................................................16
Replacing a PCB............................................................................................................................................. 16
Replacing a Reflector.................................................................................................................................... 19
Getting Technical Support and Service ................................................................................................... 19
Ordering Replacement Parts .....................................................................................................................20
Getting Repair Service.................................................................................................................................20
Figures
Figure 1 Mounting brackets attached to CN SignalMaster ........................................................11
Figure 2 DIP switches on the CN SignalMaster controller PCBA.......................................................... 14
Figure 3 Exploded front view of Model CNSMJ8 ...................................................................................... 16
Figure 4 Exploded rear view of Model CNSMJ8 ....................................................................................... 17
Figure 5 Exploded rear view of Model CNSMJ4 ....................................................................................... 18
Figure 6 Exploded rear view of Model CNSMJ2X4R ............................................................................... 18
Figure 7 Removing a reflector ........................................................................................................................ 19
Tables
Table 1 Mounting kit contents ........................................................................................................................10
Table 2 CN SignalMaster controls and wires from the Serial Interface Module .............................. 13
Table 3 CN SignalMaster DIP switch settings............................................................................................ 14
Table 4 Common replacement parts ..........................................................................................................20

Safety Messages for Installers and Service Personnel
4CN SignalMaster FSJoin™
Federal Signal www.fedsig.com
Safety Messages for Installers and Service Personnel
For your safety, read and understand this manual thoroughly before installing,
operating, and servicing the CN SignalMaster. The safety messages presented in this
section and throughout the manual are reminders to exercise extreme care at all times.
Read and understand the safety instructions to installers (doc. no. 256A692), and keep
it close at hand for reference. To download copies of this manual, go to
www.fedsig.com or call the Federal Signal Service Department at 1-800-433-9132, 7 a.m.
to 5 p.m., Monday through Friday (CT).
People’s lives depend on your proper installation and servicing of Federal Signal
products. It is important to read and follow all instructions shipped with this product.
Listed below are some other important safety instructions and precautions you should
follow.
Before Installation or Service
Qualifications
• To properly install or service this equipment, you must have a good understanding
of automotive mechanical and electrical procedures and systems, along with
proficiency in the installation and service of safety warning equipment. Always
refer to the vehicle’s service manuals when performing equipment installations on
a vehicle.
Light Hazards
• To be an eective warning device, this product produces bright light that can be
hazardous to your eyesight when viewed at a close range. Do not stare directly
into this lighting product at a close range, or permanent damage to your eyesight
may occur.
• Do not install the light system in an area that would block, impair, or blind the
driver’s vision. Ensure that the light system is mounted in a position that is outside
of the driver’s field of vision so the driver can safely operate the vehicle.
• Federal Signal power supplies and light heads are designed to work together as
a system. Combining light heads and a power supply from dierent manufacturers
may reduce the warning eectiveness of the lighting system and may damage
the components. Verify or test your combination to ensure that the system works
together and meets federal, state, and local standards or guidelines.
Electrical Hazards
• The lighting system components, especially light bulbs, strobe tubes, LEDs, and
the outer housing, get hot during operation. Disconnect power to the system and
allow the system to cool down before handling any components of the system.
• A light system is a high current system. In order for the system to function
properly, a separate negative (–) connection and positive (+) connection must
be made. All negative connections should be connected to the negative battery
terminal, and a suitable fuse should be installed on the positive battery terminal
connection as close to the battery as possible. Ensure that all wires and fuses are
rated correctly to handle the device and system amperage requirements.

Safety Messages for Installers and Service Personnel
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• Never attempt to install aftermarket equipment that connects to the vehicle
wiring without reviewing a vehicle wiring diagram available from the vehicle
manufacturer. Ensure that your installation will not aect vehicle operation
or mandated safety functions or circuits. Always check the vehicle for proper
operation after installation.
• Do not mount a radio antenna within 18 inches (45.7 cm) of the lighting system.
Placing the antenna too close to the lighting system could cause the lighting
system to malfunction or be damaged by strong radio fields. Mounting the
antenna too close to the lighting system may also cause the radio noise emitted
from the lighting system to interfere with the reception of the radio transmitter and
reduce radio reception.
• Do not attempt to wash any unsealed electrical device while it is connected to its
power source.
During Installation and Service
• DO NOT get metal shavings inside the product. Metal shavings in the product
can cause the system to fail. If drilling must be done near the unit, place an ESD-
approved cover over the unit. Inspect the unit after mounting to be sure there are
no shavings present in or near the unit.
• DO NOT connect this system to the vehicle battery until ALL other electrical
connections are made, mounting of all components is complete, and you have
verified that no shorts exist. If the wiring is shorted to the vehicle body or frame,
high current conductors can cause hazardous sparks resulting in electrical fires or
flying molten metal.
• DO NOT install equipment or route wiring (or the plug-in cord) in the deployment
path of an airbag.
• If a vehicle seat is temporarily removed, verify with the vehicle manufacturer if the
seat needs to be recalibrated for proper airbag deployment.
• Before mounting any components, check the manual to be sure that the
component you are installing is suitable for use in that area of the vehicle. Many
components are not suitable for use in the engine compartment or other extreme
environmental exposure areas.
• When drilling into a vehicle structure, be sure that both sides of the surface are
clear of anything that could be damaged. Remove all burrs from drilled holes. To
prevent electrical shorts, grommet all drilled holes through which wiring passes.
Also, ensure that the mounting screws do not cause electrical or mechanical
damage to the vehicle.
• Refer to the manual packed with the lighting system for proper electrical
connections, additional precautions,and information.
• Because vehicle roof construction and driving conditions vary, do not drive a
vehicle with a magnetically mounted warning light installed. The light could fly
o the vehicle causing injury or damage. Repair of damage incurred because of
ignoring this warning shall be the sole responsibility of the user.

Safety Messages for Installers and Service Personnel
6CN SignalMaster FSJoin™
Federal Signal www.fedsig.com
• To avoid denting the roof of the vehicle, place the light bar mounting feet as close
to the outer edge of the roof as possible.
• Roof damage can occur if the hook adjustment bolts are over-tightened. Tighten
adjustment bolts 10 ft-lb to 11 ft-lb to prevent the light bar from sliding front-to-back
when pulling on the mounting bracket. Install keeper plates.
• Locate the light system controls so the VEHICLE and CONTROLS can be operated
safely under all driving conditions.
After Installation or Service
• After installation, test the light system to ensure that it is operating properly.
• Test all vehicle functions, including horn operation, vehicle safety functions, and
vehicle light systems, to ensure proper operation. Ensure that the installation
has not aected the vehicle operation or changed any vehicle safety function or
circuit.
• Scratched or dull reflectors, mirrors, or lenses will reduce the eectiveness of
the lighting system. Avoid heavy pressure and use of caustic or petroleum based
products when cleaning the lighting system. Replace any optical components that
may have been scratched or crazed during system installation.
• Do not attempt to activate or deactivate the light system control while driving in a
hazardous situation.
• Frequently inspect the light system to ensure that it is operating properly and that
it is securely attached to the vehicle.
• After installation and testing are complete, provide a copy of these instructions to
instructional sta and all operating personnel.
• File these instructions in a safe place and refer to them when maintaining and/or
reinstalling the product.
Failure to follow all safety precautions and instructions may result in property damage,
serious injury, or death.
RETAIN AND REFER TO THIS MESSAGE

Safety Messages for Operators of Warning Lights
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Installation, Maintenance, and Service Manual
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Safety Messages for Operators of Warning Lights
People’s lives depend on your safe use of our products. Listed below are some
important safety instructions and precautions you should follow.
• Do not attempt to activate or deactivate the light system control while driving in a
hazardous situation.
• Although your warning system is operating properly, it may not be completely
eective. People may not see or heed your warning signal. You must recognize
this fact and continue to drive cautiously.
• Situations may occur that obstruct your warning signal when natural and man-
made objects are between your vehicle and others, such as raising your hood or
trunk lid. If these situations occur, be especially careful.
• All eective sirens and horns produce loud sounds that may cause, in certain
situations, permanent hearing loss. You and your passengers should consider
taking appropriate safety precautions, such as wearing hearing protection.
• In order to be an eective warning device, this product produces bright light that
can be hazardous to your eyesight when viewed at a close range. Do not stare
directly into this lighting product at a close range, or permanent damage to your
eyesight may occur.
• It is important that you fully understand how to safely operate this warning system
before use.
• Operate your vehicle and its light/sound system in accordance with your
department’s Standard Operating Procedures.
• If a selected function does not perform properly or if any of the lamps remain
illuminated when the control is o, disconnect the power connector from the
control unit and contact the nearest service center.
• At the start of your shift, ensure that the entire warning light system and the siren
system is securely attached and operating properly.
• Suction cup mounting is for temporary applications only. The unit should be
removed from the window and stored securely when not in use. Temperature
changes and sunlight can cause suction cups to lose holding power. Periodically
check the unit to make sure the suction cups have a firm grip on the mounting
surface. An improperly secured light could fall o of the vehicle, causing injury and
damage.
• Holding power of magnetic mounting systems is dependent upon surface finish,
surface flatness, and thickness of the steel mounting surface. Therefore, to
promote proper magnetic mounting:
• Keep mounting surface and magnets clean, dry, and free of foreign particles
that prevent good surface contact.
• Ensure that mounting surface is flat.
• Do not use a magnet mounting system on vehicles with vinyl tops.

Safety Messages for Operators of Warning Lights
8CN SignalMaster FSJoin™
Federal Signal www.fedsig.com
• To prevent sliding of light assembly on mounting surface, avoid quick
acceleration and hard stops.
Failure to follow these precautions may result in property damage, serious injury, or
death.
RETAIN AND REFER TO THIS MESSAGE

An Overview of the CN SignalMaster™
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An Overview of the CN SignalMaster™
The CN SignalMaster FSJoin™is a single-level LED light bar with ROC™(Reliable On-
Board Circuitry) and Solaris®LED technologies. ROC eliminates approximately 85
percent of potential failure points by incorporating a printed circuit board (PCB) in one
assembly to substantially reduce the number of electrical connections. Solaris S2 LED
modules use oset, complex, reflector surfaces for accurate beam shaping and the
highest optical eciency. The CN SignalMaster is available in eight-head and four-
head models, for both front and rear. It is also available in a rear only, split eight-head
model, with a 12 ft cable joining two four-head units (CNSMJ2X4R).
LED Lights, Colors, and Flash Patterns
The light bar’s internal microprocessor supplies three priority operational modes
and a library of flash patterns. To increase the safety of ocers, pedestrians, and
motorists, the light bar has standard dimming and intersection warning. Multi-color
heads are available with up to three dierent colored LEDs, eliminating the loss of
primary warning colors in takedown and directional warning positions. Individual
CN SignalMaster light heads can flash between red, blue, amber, or white. The
light bar operates at a nominal input of 13.6 Vdc (11 Vdc minimum) and an operating
temperature range of –30°C to +65°C (–22°C to +149°C).
The functions of the SignalMaster are controlled through the CAT5 serial
communication cable. The cable connects to Federal Signal Convergence network
controllers, or the Convergence Serial Interface Module (Part Number 858303641).
With the Serial Interface Module, the light bar can be activated by Federal Signal light
bar controllers, SignalMaster controllers, and/or individual low-current switches.
The housing is an anodized aluminum extrusion. The light bar has 15-foot power and
ground cables and a 25-foot serial cable. Universal mounting hardware is supplied;
vehicle-specific mounting hardware is also available separately.
FSJoin™
FSJoin light bars allow flash patterns to synchronize with other FSJoin-compatible
devices. You can program light bar patterns and features on an individual light head
basis with the Convergence Network Configuration Software. Outputs or light heads
set to the same flash rate automatically synchronize. You can program a variety of
system features with the Convergence Network Configuration Software (available
on the Federal Signal website at www.fedsig.com). Programming requires an FSJoin-
compatible controller such as a Pathfinder®Siren/Light Controller. Programming does
not require disassembling or removing any hardware from the vehicle.

Installing the CN SignalMaster
10 CN SignalMaster FSJoin™
Federal Signal www.fedsig.com
Installing the CN SignalMaster
After unpacking the CN SignalMaster, inspect it for damage that may have occurred
in transit. If it has been damaged, do not install it. File a claim immediately with the
carrier, stating the extent of damage. Carefully check all envelopes, shipping labels,
and tags before removing or destroying them. Ensure that the parts listed in Table 1
are included in the package. If you are missing any parts, contact Customer Support
at 1-800-264-3578, 7 a.m. to 5 p.m., Monday through Friday (CT). An installer-supplied
control head for controlling the functions of the light bar is also required.
Table 1 Mounting kit contents
Qty. Description Part Number
2 Bracket, Mounting, SML 8652180
4 Screw, #10 Type B, Pan 6-Lobe, Blk SS 7011246-06
2 Nut,1/4-20 Keps®,SS 7058050
1 Grommet, Split 228128
NOTE: The CNSMJ2X4R includes two mounting kits.
Mounting the CN SignalMaster™
LOCATING OPERATOR CONTROLS: The controls for the light system must be
located so that the VEHICLE and CONTROLS can be operated safely under all
driving conditions.
SIGNALMASTER ORIENTATION: The CN SignalMaster light bar must be
oriented correctly for proper operation. The assembly should be installed with
the ROC board on top.
IMPORTANT: Plan all cable routing before completing the installation. Plan the
location of the wire-routing hole so that the cables do not have tight bends. For Model
CNSMJ2X4R, ensure the board to board connection is in a dry interior location.
To mount the light bar:
1. Determine the appropriate spacing of the mounting holes for your application.
2. See Figure 1 on page 11. Install the mounting brackets to the CN SignalMaster
with two #10 6-lobe screws per bracket.
3. Mark and drill two 17/64-inch holes for the mounting studs and a 3/4-inch hole for
the cables.
4. Install the grommet, route the cables, then secure the light bar with the 1/4-20
Keps®nuts. Leave slack in the cables behind the panel to ease the removal of the
light bar.

Installing the CN SignalMaster
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Figure 1 Mounting brackets attached to CN SignalMaster
#10 TORX SCREW (4)
MOUNTING BRACKET (2)
SIGNALMASTER
ALUMINUM EXTRUSION
STUD FOR 1/4-20 KEP NUT
290A6967
Wiring the CN SignalMaster™in the Vehicle
INSTALLATION PRECAUTIONS: The warning system and/or two-way radio
system may operate improperly if a two-way radio antenna is installed on or
within 18 inches of the light bar. Before permanently installing the light bar or
a two-way radio antenna, test the warning system and two-way radio system.
Some installations may require the relocation of the two-way radio antenna
to the trunk or fender. DO NOT drill holes in the light bar or install auxiliary
devices on the light bar, or the warning system may fail.
DO NOT DRILL INTO LIGHT BAR: DO NOT drill holes additional holes or install
auxilliary devices on he light bar. Damage to the unit, serious injury, or death
may result.
Before proceeding, ensure that the light bar has been installed inside the vehicle in
accordance with the instructions included with the mounting kit.
To change DIP switch selections, refer to “Setting Configuration Options” on page
14.
The CN SignalMaster is completely wired at the factory and does not require any
additional internal wiring. Two 16AWG power conductors (red and black) and the
CAT5 communication cable exit the light bar. The conductors necessary to control the
light bar are contained in the CAT5 cable, which connects to a compatible Federal
Signal control head or to the Serial Interface Module.

Installing the CN SignalMaster
12 CN SignalMaster FSJoin™
Federal Signal www.fedsig.com
EXPLOSION HAZARD: To avoid a battery explosion, always disconnect the
negative battery cable rst and reconnect it last. Avoid causing a spark when
connecting near or to the battery. The gases produced by a battery can cause
a battery explosion that could result in vehicle damage and serious injury.
SEAT REMOVAL PRECAUTION: If a vehicle seat is temporarily removed, verify
with the vehicle manufacturer if the seat needs to be recalibrated for proper
airbag deployment.
REVERSE POLARITY/MISWIRING: Reverse polarity may damage the siren
amplier. To avoid damage to the siren/amplier, ensure that the battery
voltage is the same voltage as the rating of the light and that the correct
polarity is observed.
To wire the light bar in the vehicle:
1. Ensure that the lines are adequately fused. From the light bar, route the CAT5
control cable into the vehicle’s cab or trunk near the planned location of a control
head that is compatible with the light bar or Serial Interface Module.
NOTE: An input cable (24-pin harness) is provided with the Serial Interface
Module. For connections, see document P/N 2562248.
2. Route and connect the 16 AWG black lead to the vehicle battery’s ground (–NEG)
terminal.
3. Route and connect the 16 AWG red lead through the user-supplied 15 A fuse at the
source to the positive (+BAT) terminal.
Wiring the SignalMaster™Function
The SignalMaster directional warning function is configured at the factory and does
not require any additional wiring inside the light bar. All conductors necessary for
control of the SignalMaster are through the compatible serial communication control
head or the Serial Interface Module. For wiring and operation, refer to the instructions
included with the control head included with the Serial Interface Module.
Wiring the Light Bar Controls
Both the Federal Signal serial control head and the Serial Interface Module provide
the controls in Table 2 to the light bar. The table shows the corresponding control
wires from the Serial Interface Module and their colors. The wire’s first color is the
predominant color and additional colors are stripes.
For programming options, see the instructions included with the Interface Module or
the Federal Signal serial control head.

Installing the CN SignalMaster
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Table 2 CN SignalMaster controls and wires from the Serial Interface Module
Light Bar Controls Wire Color Description
Mode 1 Blue Lowest priority
Mode 2 Blue/White Overrides Mode 1
Mode 3 Black/Red Overrides Modes 1 and 2
Steady Burn Red/White One (driver side) or two heads (driver and
passenger side) burn steadily when 12 Vdc is
applied to the control wire for Steady Burn.
Front Cuto󰀨* Green/White Turns OFF power to the Front CN
SignalMaster™.
Rear Enable* Green/White Turns ON power to the Rear CN SignalMaster.
Not available for Front CN SignalMaster.
Flash Takedown Red/Black Flashes the Takedown lights in Modes 1, 2, and
3 with every ash pattern.
Left Alley Green/Black Not available
Right Alley Orange/Red Not available
Takedown White/Black Provides white light to the front. Overrides Flash
Takedown lights and Front Cuto󰀨.
Low Power White/Black/Red Dims the lights approximately 50 percent to
prevent blinding approaching drivers. Low
Power is available only in Modes 1 and 2 and is
disabled when switched to another ash pattern,
including Mode 3 and Intersection.
Scene Light, Left (SW-2
Switch 3 in the down
position)
Blue/Black Applying 12 Vdc to the Scene Light, Left wire
turns on the left half of the CN SignalMaster.
Scene Light, Right
(SW-2 Switch 3 in the
down position)
Black/White/Red Applying 12 Vdc to the Scene Light, Right wire
turns on right half of the light bar.
*See Serial Interface Module Instructions for more information on programming.
NOTE: If you are installing a Front and Rear CN SignalMaster on the same vehicle, you
can use one interface box with a CAT5 splitter (P/N 1751531A).

Installing the CN SignalMaster
14 CN SignalMaster FSJoin™
Federal Signal www.fedsig.com
Setting Conguration Options
The CN SignalMaster™has three configuration options that are selectable with DIP
switches on the light bar’s control board. Table 3 describes the options. See Figure2
on page 14 for the locations of DIP switches on the controller PCBA in the CN
SignalMaster.
Table 3 CN SignalMaster DIP switch settings
DIP
Switch
Position
Description of Option
SW1 Not used
SW2 Not used
SW3 To activate a front-mounted CN SignalMaster, set Switch 3 ON.
To activate a rear-mounted CN SignalMaster, set Switch 3 OFF.
SW4 Sets the ability to power the network cable for other devices. The default is OFF. DIP
Switch 4 should be set only if the main power cables are turned on through an ignition-
activated relay. If powering other devices, such as the Six-Button Serial Controller, set
DIP Switch 4 to ON. For more information, see the instructions included with the network-
powered device.
Figure 2 DIP switches on the CN SignalMaster controller PCBA
ON
14ON
14
SW4
SW3
SW2
SW1
290A6977
FOR THE LOCATION OF THE CONTROLLER PCB,
SEE FIGURE 4 ON PAGE 17 AND FIGURE 5 ON PAGE 18.

Installing the CN SignalMaster
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Testing the Light Bar
LIGHT HAZARD: To be an eective warning device, an emergency warning
system produces bright light that can be hazardous to your eyesight when
viewed at a close range. Do not stare directly into this lighting product at a
close range, or permanent damage to your eyesight may occur.
EXPLOSION HAZARD: To avoid a battery explosion, always disconnect the
negative battery cable rst and reconnect it last. Avoid causing a spark when
connecting near or to the battery. The gases produced by a battery can cause
a battery explosion that could result in vehicle damage and serious injury.
To check the light bar controls (see Table 2 on page 13):
1. Connect the 16 AWG black lead from the light bar to the vehicle battery’s ground
(–NEG) terminal and the 16 AWG red lead to the positive terminal.
2. Connect the black and black/white wires from the Serial Interface Module to the
vehicle battery’s ground (–NEG) terminal
3. Apply 12 Vdc to a control wire and to the ignition wire from the Serial Interface
Module.
4. After the installation, check the entire system to be sure the lights are flashing
properly and all light system functions are operating properly.

Maintaining and Servicing the CN SignalMaster™
16 CN SignalMaster FSJoin™
Federal Signal www.fedsig.com
Maintaining and Servicing the CN SignalMaster™
This section has instructions for maintaining and servicing the CN SignalMaster,
including replacing the light bar PCBs and reflectors. For additional service and
support, call the Federal Signal Service Department at 800-433-9132, 7 am to 5 pm,
Monday through Friday (Central Time). For a list of common replacement parts, see
“Ordering Replacement Parts” on page 20.
Establishing a regular maintenance schedule for the CN SignalMaster extends its life
and ensures safety. Periodically verify that the light bar operates properly and that
all mounting hardware is securely fastened to the vehicle. Inspect the reflectors for
cracks, crazing (hairline cracks), discoloration, and other defects.
Replacing a PCB
Depending on the installation, it may be necessary to remove the CN SignalMaster
from the vehicle
To remove the CN SignalMaster:
1. On the cable exit side, remove the two #10-32 6-lobe screws and the right
end bracket. Holding both light assemblies (the Model CNSMJ4 has one light
assembly), slide them from the aluminum extrusion.
Figure 3 Exploded front view of Model CNSMJ8
#10-32 6-LOBE SCREW (4)
BRACKET, RIGHT-HAND END
TO “SML” CONNECTOR ON
LIGHTBAR CONTROLER
LIGHT ASSEMBLIES (2)
ALUMINUM EXTRUSION
290A6994
2. Pull the cap(s), seal(s), and ROC board(s) from the lens.
3. Disconnect cables and remove the #6-32 Phillips screw to separate the PCBs.
4. Inspect the lip seal(s) to ensure it is not torn, brittle, or damaged. Replace it if
necessary. For replacement parts, refer to Table 4 on page 20.
5. Reassemble the light bar.

Maintaining and Servicing the CN SignalMaster™
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Installation, Maintenance, and Service Manual
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Figure 4 Exploded rear view of Model CNSMJ8
LENS (2)
ROC PCB ASSEMBLY (2)
LOCATION OF CONTROLLER PCBA
CAT5
#6-32 SCREW (2)
CAP (2)
LIP SEAL (2)
REFLECTOR (8)
#10-32 6-LOBE SCREW (4)
BRACKET, RIGHT END
BRACKET, LEFT END
290A6978
ALUMINUM EXTRUSION
PWR/GND
HARNESS

Maintaining and Servicing the CN SignalMaster™
18 CN SignalMaster FSJoin™
Federal Signal www.fedsig.com
Figure 5 Exploded rear view of Model CNSMJ4
#6-32 SCREW
REFLECTOR
290A6995
ALUMINUM EXTRUSION
LENS
ROC PCB
ASSEMBLY
CAP
LIP SEAL
#10-32 6-LOBE SCREW (4)
LOCATION OF
CONTROLLER PCBA
BRACKET, LEFT END
BRACKET, RIGHT END
PWR/GND
HARNESS
CAT5
Figure 6 Exploded rear view of Model CNSMJ2X4R
REFLECTOR (8)
SMART BACKER PCB ASSEMBLY
CAP (2)
LIP SEAL (2)
EXTRUSION (2)
LH END CAP(2)
#10 SIX-LOBE SCREW(8)
BOARD TO BOARD CABLE,36"
PWR/GND HARNESS
6-32 SCREW(2)
CAT5
ROC PCB ASSEMBLY (2)
BUSHING (3)
FOAM FILLER
RH END CAP
LENS (2)
RH END CAP, CNSM2X4R
BOARD TO BOARD CABLE,144"
DUMB BACKER PCB ASSEMBLY

Maintaining and Servicing the CN SignalMaster™
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Installation, Maintenance, and Service Manual
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Replacing a Reector
CRAZING HAZARD: Crazed, cracked, or faded domes or reectors reduce the
light output and the eectiveness of the lighting system. Tops or reectors
showing this type of aging must be replaced. Failure to follow this warning
may result in bodily injury or death to you or others.
To replace a reflector:
1. To remove the PCB that holds the reflector, see “Replacing a PCB” on page 16.
2. Use a small Phillips screwdriver to press and release the two round tabs on the
reflector from beneath the PCB. Slide the reflector toward the rear of the PCB. See
Figure 7.
3. Lift the rear of the reflector away from the PCB and remove it.
4. To install the new reflector, insert its front hooks into their slots on the PCB.
5. Bring the rear of the reflector down to insert its rear hooks through the PCB.
6. When the reflector rests on the PCB, make sure the rear hooks are fully inserted
and slide the reflector forward until its tabs snap into place.
Figure 7 Removing a reector
➀
➁
290A6978
➂
➃
PRESS THE ROUND TABS FROM
BENEATH THE PCB AND SLIDE
THE REFLECTOR BACK.
LIFT THE REAR OF THE
REFLECTOR TO REMOVE IT.
➀
➁
REMOVAL:
➄
INSERT THE FRONT HOOKS IN
THE PCB.
BRING THE REAR OF THE REFLECTOR
DOWN ON THE PCB AND INSERT THE
REAR HOOKS INTO THE PCB.
SLIDE THE REFECTOR FOWARD
UNTIL IT SNAPS INTO PLACE.
➂
➃
INSTALLATION:
➄
REAR HOOKS
Getting Technical Support and Service
For technical support and service, please contact:
Federal Signal Corporation
Service Department
Public Safety Systems
Phone: [phone]
Email: [email protected]

Maintaining and Servicing the CN SignalMaster™
20 CN SignalMaster FSJoin™
Federal Signal www.fedsig.com
Ordering Replacement Parts
This section contains a list of common and vehicle-specific replacement parts. For
illustrations, see Figure 4 on page 17, Figures 5 and 6 on page 18. To order
replacement parts, call Customer Support at 1-800-264-3578, 7 a.m. to 5 p.m.,
Monday through Friday (CT) or contact your nearest distributor or local dealer.
Table 4 Common replacement parts
Description Part Number
PCB Assembly Contact Federal Signal
Cable Assembly, Power, 15 ft 1461816
Cable, Network, 25 ft 1751357-02
Lens 8652133
Seal 865200996
Getting Repair Service
The Federal Signal factory provides technical assistance with any problems that
cannot be handled locally.
Any units returned to Federal Signal for service, inspection, or repair must be
accompanied by a Return Material Authorization (RMA). Obtain a RMA from a local
Distributor or Manufacturer’s Representative.
Provide a brief explanation of the service requested, or the nature of the malfunction.
Address all communications and shipments to the following:
Federal Signal Corporation
Service Department
Public Safety Systems
2645 Federal Signal Dr.
University Park, IL 60484-3167
2645 Federal Signal Drive
University Park, Illinois 60484-3167
www.fedsig.com
Customer Support
Police/Fire-EMS: 800-264-3578 • [phone]
Work Truck: 800-824-0254 • [phone]
Technical Support 800-433-9132 • [phone]