Daktronics VF-20 Series User manual

201 Daktronics Drive
Brookings, SD 57006-5128
www.daktronics.com/support
800.325.8766
GENERIC SERVICE
VF-20XX
GEN 4
DISPLAY MANUAL
7 June 2018
DD3820741
Rev 0

Copyright © 2018
All rights reserved. While every precaution has been taken in the preparation of this manual, the publisher assumes no
responsibility for errors or omissions. No part of this book covered by the copyrights hereon may be reproduced or copied
in any form or by any means—graphic, electronic, or mechanical, including photocopying, taping, or information
storage and retrieval systems—without written permission of the publisher.
Daktronics trademarks are property of Daktronics, Inc. All other trademarks are property of their respective companies.

– i –
Table of Contents
1 Introduction.........................................1
How to Use This Manual ............................1
Theory of Operation ..................................1
Vanguard® Software ...............................1
VFC-3000 Controller/Vanguard® Field
Controller.................................................1
Auxiliary Control Panel ..............................2
2 Components .......................................3
Modules ......................................................3
Power Supply Assembly ............................3
Power Supply Mounting Panel ..............3
Power Supplies........................................3
Isolation Board........................................3
Service Control Panel................................4
Vanguard® Control Board ......................4
Panelboard .............................................4
Surge Suppressor ....................................4
Relays ......................................................4
DC Breaker Rail ..........................................5
Display UPS System ....................................5
Sensors Network.........................................5
Rear Sensor .............................................5
Internal Sensor ........................................5
Bottom Sensor .........................................5
Door Detection........................................5
Ventilation and Heater Systems...............5
Ventilation Fans and Filters....................5
Defog Heater Fans..................................5
Fan RPM Sensors .....................................5
Lights ...........................................................6
Beacon(s) ...................................................6
UPS...............................................................6
3 Electrical Installation ..........................7
Power Installation.......................................7
Grounding ...............................................7
Power.......................................................7
Bonding Screw........................................7
Power Connections...................................7
Display Termination................................8
Conduit Sealing ......................................8
Module Connection ...............................8
Fans and Power Supplies Connection....
..................................................................8
Trafc Cabinet ...........................................8
Vanguard® Control Board Address
Setting......................................................9
4 Maintenance and Troubleshooting 10
Getting Started ........................................10
Service and Diagnostics .........................10
Module Numbering System ....................10
7-Segment Error Codes (VFC-3000
Controller).................................................11
Modules.................................................11
VCB ........................................................11
Isolation Board......................................11
7-Segment Error Codes (Vanguard®Field
Controller).................................................12
VCB ........................................................12
Modules.................................................13
Isolation Board......................................13
VFC-3000 Controller/Vanguard® Field
Controller Replacement.............................
...................................................................13
Module Replacement (20mm) ..............14
Environmental Sensors.............................14
Airow Sensor........................................14
Light/Temperature/Humidity Sensor...14
Power Supply Assembly Replacement .15
Vanguard® Control Board (VCB) ...........15
Ventilation Fan and Filter Maintenance ...
...................................................................15
Filter Replacement ...............................15
Fan Replacement.................................16
Trafc Cabinet Maintenance.................16
Trafc Cabinet Fan and Thermostat
Assembly Replacement ......................16
Trafc Cabinet Light Replacement .....16
Display Maintenance..............................16
Structure ................................................16
Earth Ground Resistance .....................16
Display Cabinet ....................................17
Temperature and Light Sensors...........17
Ventilation Fans ....................................17
Filters ......................................................17

– ii –
Table of Contents
VFC-3000 Controller/Vanguard® Field
Controller...............................................17
Face Panels...........................................17
Wet Outdoor Cleaning Method......17
Pressure Wash Cleaning Method ....18
LEDs ........................................................18
LED and Electronic Circuitry ................18
Maintenance Checklist ..........................19
Troubleshooting .......................................20
5 Replacement Parts and Exchange and
Repair Programs ...............................22
Daktronics Part Numbers ........................22
Daktronics Exchange and Repair & Return
Programs...................................................22
Exchange Program ..............................22
Before Contacting Daktronics.............22
Repair & Return Program .....................23
Shipping Address..................................24
Email ......................................................24

Introduction
1
1 Introduction
How to Use This Manual
This manual explains the installation, maintenance, and troubleshooting of VF-20X0
series Dynamic Message Signs (DMS). For information regarding the safety, installation,
operation, or service of this system, refer to the telephone numbers on the cover page of
this manual.
Daktronics identies manuals by the ED or DD number located on the cover page of
each manual. For example, this manual is referred to as DD3820741.
The serial and model numbers for the display are on the ID label attached to the display.
This label looks similar to Figure 1. When calling Daktronics Customer Service, please have
this information available to ensure timely response.
Refer to the Daktronics Exchange and Repair & Return Programs (p. 22) if any
component needs replacement or repair.
Theory of Operation
Vanguard® Software
Daktronics Vanguard® software allows the DMS operator to check display status and to
control messages. Refer to the Vanguard® Software Help File [F1] for information about
operating Vanguard® software.
VFC-3000 Controller/Vanguard® Field Controller
The VFC-3000 controller/Vanguard® Field Controller is the communication hub for DMS
management; it is located in the display or the trafc cabinet.
The central controller creates messages and transmits them to the VFC-3000 controller/
Vanguard® Field Controller for storage. Upon request from the central controller or the
front panel interface, the VFC-3000 controller/Vanguard® Field Controller locates the
message to display and sends it to the display’s modules via the Vanguard® control
board. The modules activate the appropriate pixels to form the message.
The VFC-3000 controller/Vanguard® Field Controller also monitors local sensors (display-
based sensors) like temperature, light level, and door detection. The VFC-3000 controller/
Vanguard® Field Controller interprets sensor data for display control and diagnostic
functions, such as adjusting the display’s intensity for current lighting conditions.
Refer to the controller manual for conguration information.
Figure 1: Display ID Label

Introduction
2
Auxiliary Control Panel
The auxiliary control panel (ACP) complements the controller by providing a secondary
control interface panel at the DMS site. The ACP allows a maintenance technician to
perform diagnostics while working in one location without having to access the controller
in another location. This improves safety and reduces maintenance time. The ACP may
be located in the display or the trafc cabinet.

Components
3
2 Components
Modules
A module is a replaceable unit consisting of a display
panel with clusters of LEDs, called pixels. The pixels
display messages on the display. Refer to Figure 2.
Each module contains drive electronics that receive
data packets from the Vanguard® control board and
lights the appropriate pixels at the correct dimming
level.
Power Supply Assembly
Power Supply Mounting Panel
Each panel can mount two to four power supplies.
Each power supply is equipped with an isolation
board. Refer to Figure 3.
Power Supplies
The power supplies provide voltage to power
the modules. Multiple power supplies provide
power redundancy. If one power supply
fails, the other power supplies support the full
power load, which prevents power failure to
the modules.
Isolation Board
One isolation board mounts to each power
supply. The isolation board provides input
and output voltage to the power supply.
Figure 4 shows an isolation board.
The isolation board receives 120 VAC input
voltage from the distribution panel. Output
from the power supply routes through the
isolation board. From there, the 24 VDC
output routes to the DC breaker rail.
Isolation board diagnostics include power supply data sent to the VFC-
3000 controller/Vanguard® Field Controller about output voltage.
Figure 2: Module (Rear View)
Figure 3: Power Supply
Mounting Panel
Figure 4: Isolation
Board

Components
4
Service Control Panel
The service control panel (SCP) is located on the right side of the display’s back wall. The
internal components of the SCP use information received from the VFC-3000 controller/
Vanguard® Field Controller to control the display. Figure 5 shows the location of the SCP’s
internal components.
Vanguard® Control Board
The Vanguard® control board (VCB) receives high-speed serial data from the VFC-
3000 controller/Vanguard® Field Controller through a ber-optic or Cat-5 cable. It
then distributes the signal to the appropriate modules and sensors. The VCB receives
diagnostic data from the modules, temperature and light sensors, and isolation boards
and transmits the data to the VFC-3000 controller/Vanguard® Field Controller. The VCB
also monitors door sensors, ventilation fans, defog heaters, power supplies, beacons, RPM
sensors, and airow sensors.
The VCB uses a protocol that routes signal to each bay of the display. With this protocol,
signal failure to one module in a bay does not affect other LED modules in that bay.
Panelboard
The panelboard is a circuit breaker box that distributes incoming power to the display
components that require AC power.
Surge Suppressor
The parallel surge suppressor protects the display from transient voltage spikes.
Relays
Relays are solid-state switches in which the electrical current applied across one port or
terminal controls electrical currents for another terminal, such as a beacon, heater, or
fan. Relays receive signal from the VCB.
Outlet and Timer Enclosure
Panelboard
Intake and
Defog Heater
Relays
Vanguard®Control Board
Rear Sensor
Figure 5: Service Control Panel

Components
5
DC Breaker Rail
The DC breaker rail receives incoming power from the power supplies and distributes
power to the modules and the VCB.
Display UPS System
A UPS contains batteries and an inverter. If the utility AC power fails, the UPS powers the
controller and communication equipment for a limited amount of time. Components
of the display UPS system are located in the display or the trafc cabinet. Refer to the
appropriate UPS Operator’s Manual for more information.
Sensors Network
Rear Sensor
The rear light sensor consists of a small printed circuit board (PCB) mounted to the back
of the display.
The light sensor transmits the ambient light level behind the display to the VCB. The VFC-
3000 controller/Vanguard® Field Controller adjusts the display accordingly.
Internal Sensor
The internal temperature, humidity, and front light sensor measures the temperature and
humidity near the LED pixels and the ambient light level in front of the display. The sensor
transmits these measurements to the VCB, and the VFC-3000 controller/Vanguard® Field
Controller adjusts LED intensity to protect the LEDs from overheating.
Bottom Sensor
The bottom temperature and light sensor is located on the bottom-right side of the
display. It detects the ambient temperature and light intensity below the display.
Door Detection
The door sensor is located at the top of the door opening(s). The sensor detects whether
the doors are open or shut, and it routes this information to the VCB, which monitors
the status of the door sensors and reports it to the VFC-3000 controller/Vanguard® Field
Controller.
Ventilation and Heater Systems
Ventilation Fans and Filters
Filtered intake fans mount to the upper rear of the display. The VFC-3000 controller/
Vanguard® Field Controller analyzes internal and external temperature readings from the
temperature sensor network and adjusts fan usage. A lter removes dust and debris from
the incoming air to protect the internal display components.
Defog Heater Fans
The heater fans mount to the bottom of the display. The heater fans warm the front face
to prevent fogging. The VFC-3000 controller/Vanguard® Field Controller analyzes internal
temperature readings from the temperature sensor network and adjusts heater fan
usage accordingly.
Fan RPM Sensors
Each ventilation fan has an internal RPM sensor. The fans fail if they do not revolve at
least 1,000 RPM. This information is then reported to and displayed on the VFC-3000
controller/Vanguard® Field Controller.

Components
6
Lights
The display is equipped with lights, which are turned on by a timer switch.
Beacon(s)
Beacons are turned on and off independently from the rest of the sign by the VCB. A
power supply and DC relays make up the beacon controller and are located within the
SCP.
Beacons are used at the customer’s discretion.
UPS
A UPS contains batteries and an inverter. If the utility AC power fails, the UPS powers the
controller and communication equipment for a limited amount of time.

Electrical Installation
7
3 Electrical Installation
Daktronics recommends that a separate circuit be run to the electronic display(s) to
isolate it and prevent any issues that could be caused by line voltage uctuations or
high frequency noise on the power line caused by other types of equipment. A separate
circuit also makes display maintenance and troubleshooting easier. Daktronics assumes
no liability for any issues caused by line voltage uctuations or other improper power
conditions if these recommendations are not followed.
Power Installation
Qualied personnel must perform electrical installations to prevent injury to personnel
and damage to the equipment.
Grounding
All components of a display system—including but not limited to displays, control
equipment, and connected peripheral equipment—must be electrically grounded.
Only qualied individuals may perform electrical work, including verication of ground
resistance. Daktronics is not responsible for improper grounding or damage incurred as a
result of improper grounding.
Grounding methods must meet the provisions of all applicable local and national codes.
Inspect and verify all grounding methods meet the provisions of all applicable local and
national codes.
Proper grounding is necessary for reliable equipment operation and general electrical
safety. Failure to properly ground the display system may void the warranty, disrupt
operation, damage equipment, and cause bodily harm or death.
Power
For installation with ground and neutral conductors provided, the power cable must
contain an isolated earth-ground conductor. Do not connect neutral to ground at the
disconnect or at the display; this violates electrical codes and voids the warranty. Use a
disconnect so all hot lines and neutral can be disconnected.
Bonding Screw
A bonding screw is included (not installed) with the panelboard. If the bonding screw is
required, install it to avoid violation of local or national codes.
Power Connections
Each display operates on 120/240 VAC 3-wire plus ground, single-phase power. Power
routes through the opening in the display rear and terminates at the panelboard.
Route power and signal cables to the display in conduit approved by local and national
codes. Terminate all wires as labeled in the termination panels.

Electrical Installation
8
Display Termination
Power enters the display through the rear wall into the SCP. To connect power to the
display:
1. Locate the A41 panelboard inside the display.
2. Remove the panelboard cover to reveal the inside of the panelboard.
3. Route the power cables through the 1 1/2" conduit hub, into the SCP, and into the A41
panelboard.
4. Terminate each wire at the appropriate terminal block and earth-ground lug.
Conduit Sealing
Fill the ends of conduits entering the display with duct seal.
Module Connection
4-pin connectors make the low voltage power connections within the display. Power for
each module is provided with the use of one red and one black wire. Power connections
are completed at the factory.
Fans and Power Supplies Connection
The fans and power supplies use 120 VAC from the panelboard. The surge suppressor in
the panelboard protects the power supplies and modules from damaging power surges.
Trafc Cabinet
Individually wire the following items directly to the earth-ground rod with an 8 AWG or
larger wire according to the local and national codes.
• Earth-ground lug mounted near the bottom of each trafc cabinet door
• Conduit grounding collars
• Earth-ground connection inside the panelboard
Earth-ground rods must be installed and connected per local and national codes.
1. Connect the auxiliary power connection to the panelboard.
2. Connect the neutral power wire to the neutral bus.
3. Connect the hot wires from the terminals to the panelboard lugs.

Electrical Installation
9
Vanguard® Control Board Address Setting
The rotary switches set the sign address, which the software uses to identify the particular
display. When replacing a VCB (refer to Figure 6), set the rotary switches on the new VCB
to the same address conguration as the defective VCB. Each VCB in a network needs a
unique address.
Set the switch by rotating it clockwise or counter-clockwise until the arrow points to the
desired number; refer to Figure 7. Only 0 through 7 are viable addresses.
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Figure 6: Vanguard® Control Board
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Figure 7: VCB Rotary Switch

Maintenance and Troubleshooting
10
4 Maintenance and Troubleshooting
Getting Started
1. Before performing any repair or maintenance to the displays:
a. Disconnect utility power.
b. Disable the UPS system by shutting off the two switches on the UPS head unit face
panel.
2. Only qualied service personnel should access internal display electronics. Contact
Daktronics Customer Service for training needs.
3. Daktronics engineering staff must approve changes made to the displays. If making
modications, submit detailed drawings to the Daktronics engineering staff for
evaluation and approval or the warranty will be void.
Service and Diagnostics
The VF-20X0 series DMS are walk-in accessible, meaning all internal components are
accessible from within the display.
The following tools are required to service the display:
• Stubby Phillips screwdriver
• Small Phillips screwdriver
• Small at-head screwdriver
• Small pliers
• Medium Phillips screwdriver
• Medium at-head screwdriver
• Nut driver (3/8")
• Cable ties
• Multimeter
• Clamp-on ground meter
Module Numbering System
Daktronics uses a module numbering system
to help with troubleshooting; refer to Figure 8.
Module
101
Module
102
Module
103
Module
104
Module
105
Module
106
Module
107
Module
108
Module
109
Figure 8: Module Numbering

Maintenance and Troubleshooting
11
7-Segment Error Codes (VFC-3000
Controller)
A 7-segment indicator appears on the following components; refer
to Figure 9. The 7-segment indicator provides codes to indicate any
present errors and their cause. When an error occurs, the 7-segment
will ash the error code. If multiple errors are present, the 7-segment
will ash the errors individually in succession. If no errors are present, the
7-segment will show a continuously looping gure-8.
Modules
7-Segment Error Code Error Cause
1 Communications Lost No CAN packets received for
10 seconds.
2 Failed Pixel Refer to the Troubleshooting
(p. 20) section.
3 Power Failure Input Voltage has dropped
below 20 VDC.
8 (solid) Lost Packet Diagnostic packet, FIFO full
8 (looping) No Error
VCB
7- Segment Error Code Error Cause
1 Communications Lost No ber packets for 15
seconds
3 Power Failure
Board voltages below limit:
V-ln, 1 and 2 < 20 VDC
9 V < 8.52 VDC
3.3 V < 3 VDC
2.5 V < 2.37 VDC
1.2 V < 1.1 VDC
8 (looping) No Error
Isolation Board
7-Segment Error Code Error Cause
1 Communications Lost No CAN packets for 10
seconds.
2 Input power failure V-In < 21 VDC
5 Output power failure V-In < 21 VDC (with V-ln OK)
8 (looping) No Error
Figure 9: 7-Segment

Maintenance and Troubleshooting
12
7-Segment Error Codes
(Vanguard®Field Controller)
Three 7-segment indicators appear on the
following component; refer to Figure 10. The
7-segment indicators provide codes to indicate
normal running conditions as well as any present
errors and their cause. When an error occurs, the
7-segment will ash the error codes individually in
succession. If no errors are present, the 7-segment
will continuously cycle normal running conditions.
VCB
7- Segment Error Code Error Cause
E r r Error
If an error condition exists, the
VCB will display E r r then the
remaining error codes.
i d Hardware ID
Hardware ID (jumpers on
the module) can’t be read
correctly (parity error),
or have changed during
runtime.
A d r Address ProLink 6 address does not
match rotary switch setting.
h r d Hardware
-Errors on PL6 link(s)
-Error on sensor CAN port
On board voltage error
(measurement out of range)
-Invalid or high VCB
temperature reading
-Error reading / writing to serial
FLASH
-Error with EPLD
-7-segment display errors
(bad segment)
-Input voltage out of range
c o d Firmware
-Invalid interrupt occurred
-Micro bootloader FW not
found
-Stack overow
-EEPROM write / erase error
-No EPLD bootloader
program found, or running
EPLD bootload FW when it
shouldn’t be
-Invalid PL6 modify packet
P L 6 ProLink 6 Port A and Port B not in sync
Figure 10: Three 7-Segment Indicators

Maintenance and Troubleshooting
13
A single 7-segment indicator appears on the following components; refer to Figure 9. The
7-segment indicator provides codes to indicate any present errors and their cause. When
an error occurs, the 7-segment will ash the error code. If multiple errors are present,
the 7-segment will ash the errors individually in succession. If no errors are present, the
7-segment will show a continuously looping gure-8.
Modules
7-Segment Error Code Error Cause
1 Communications Lost No CAN packets received for
10 seconds.
2 Failed Pixel Refer to the Troubleshooting
(p. 20) section.
3 Power Failure Input Voltage has dropped
below 20 VDC.
8 Lost Packet Diagnostic packet, FIFO full
8 (looping) No Error
Isolation Board
7-Segment Error Code Error Cause
1 Communications Lost No CAN packets for 10
seconds.
2 Input power failure V-In < 21 VDC
5 Output power failure V-In < 21 VDC (with V-ln OK)
8 (looping) No Error
VFC-3000 Controller/Vanguard® Field Controller
Replacement
1. Turn off the power switch on the VFC-3000 controller/Vanguard® Field Controller face.
2. Label and remove all of the connections from the front and rear of the VFC-3000
controller/Vanguard® Field Controller.
3. Remove the screws securing the VFC-3000 controller/Vanguard® Field Controller to
the inside of the display or trafc cabinet and remove the controller.
4. Perform the needed maintenance.
5. When the VFC-3000 controller/Vanguard® Field Controller is ready for installation, slide
it back into place.
6. Hold the controller in place and install the mounting screws.
7. Reconnect all connectors removed from the VFC-3000 controller/Vanguard® Field
Controller.
8. Secure any retaining screws and prepare the VFC-3000 controller/Vanguard® Field
Controller for operation as described in the controller manual.

Maintenance and Troubleshooting
14
Module Replacement (20mm)
1. Turn off power to the failed module by turning off the breakers for all power supplies.
2. Remove the wire connections:
a. Press the locking tabs of the 4-pin power connector and remove the connector.
b. Press the tabs of the 20-pin signal connector and remove the connector.
3. Unlatch the 12 plastic hex nuts securing the module to the display.
4. Remove the module from the display face.
5. Align the new module with the 12 studs and replace the wingnuts.
6. Replace the 12 plastic hex nuts removed in Step 3.
7. Plug the 4-pin power connector and 20-pin signal connector into the new module.
Note: The connectors only t together one way; do not force the connection.
8. Reapply power to the power supplies turned off in Step 1.
9. Test the modules:
a. Display the moving row, moving column, and all on/all off test messages. Run
the test messages at both 10% and 100% brightness settings. Watch for proper
operation of the LED module during each test message.
b. Perform a pixel test and check that all pixels operate correctly.
Environmental Sensors
Airow Sensor
To remove the sensor:
1. Locate the failed sensor reported by the controller.
2. Turn off the intake fan breaker.
3. Loosen the 1/4-turn fastener on the bottom of the intake fan assembly. Lift the intake
cover up. Remove the lter.
4. Disconnect the Mate-n-Lok® connector.
5. Remove the nut and mechanical screw holding the sensor in place.
To replace the sensor, repeat the above steps in reverse order.
Light/Temperature/Humidity Sensor
To remove the sensor:
1. Locate the failed sensor reported by the controller.
2. Disconnect the terminal block from the sensor.
3. Remove the two Phillips screws fastening the sensor to the mounting plate.
To replace the sensor, repeat the above steps in reverse order.
Caution: Modules are not hot swap components. Always turn off power to the modules
prior to servicing.

Maintenance and Troubleshooting
15
Power Supply Assembly Replacement
Power supply assemblies are mounted on the rear interior of the display.
1. Turn off power to the power supply assembly by turning off the breaker in the
distribution panel.
2. Locate the failed power supply assembly reported by the VFC-3000 controller/
Vanguard® Field Controller.
3. Loosen the screw securing the power supply assembly to the backsheet, and gently
lift the power supply assembly off the backsheet.
To replace the new power supply, repeat the above steps in reverse order.
Vanguard® Control Board (VCB)
To replace the VCB (PC1):
1. Turn off the circuit breakers powering all power supplies.
2. Remove all connections to the VCB, including incoming signal from the VFC-3000
controller/Vanguard® Field Controller and outgoing signal to the modules and
sensors.
3. Remove the screws holding the board in place, and carefully remove the failed VCB.
4. Position the new board in the enclosure and secure with the screws removed in
Step 3. Securely fasten the screws to ensure proper grounding.
5. Reconnect all connections removed in Step 2.
6. Match the address of the new VCB to the address of the VCB being replaced.
7. Restore power.
Ventilation Fan and Filter Maintenance
Each time an intake fan assembly is opened, perform the following:
• Check the fan blades for dirt and debris. Clean the fan blades to maintain the fan’s
efciency and to ensure proper cooling. If the fan blades have a large accumulation
of dirt and debris, change the lters more often.
• Spin the fan blades with a pen or pencil to ensure the bearings are free and the fan is
balanced.
• Check the lters every year. Clean the lters with water and a mild detergent, such as
dish soap.
• Compressed air can be used to clean the lter provided the nozzle is held at least 6"
away from the lter, the pressure is no greater than 60 psi.
Filter Replacement
1. Turn off the intake fan breaker.
2. Loosen the 1/4-turn fastener on the bottom of the intake fan assembly panel.
3. Lift intake cover up. Remove the lter.
4. Slide a new lter into the panel.
5. Rotate the fan assembly back into its original position and tighten the 1/4-turn
fastener.

Maintenance and Troubleshooting
16
Fan Replacement
1. Unplug the fan cord and cut the cable ties.
2. Remove the hardware holding the fan and nger guard in place.
3. Remove the failed ventilation fan.
To replace the ventilation intake fan, follow the previous steps in reverse order. Ensure the
fan is properly oriented.
Trafc Cabinet Maintenance
Trafc Cabinet Fan and Thermostat Assembly Replacement
1. Open the panelboard and turn off the circuit breaker supplying power to the fan and
thermostat assembly.
2. Disconnect the fan’s power cord.
3. Remove the hardware securing the nger guard and fan to the assembly bracket
and remove the fan.
4. Attach the new fan to the bracket and secure it using the hardware removed in
Step 3. Note the airow orientation when attaching the new fan.
5. Reconnect power to the fan.
6. Adjust the thermostat to test the fan.
Trafc Cabinet Light Replacement
1. Turn off the circuit breaker that powers the light.
2. Remove the 4 screws.
3. Disconnect the wires.
4. Attach the new light assembly
5. Restore power and test the light.
Display Maintenance
The following service intervals are recommendations. Contact Daktronics for
recommendations based upon location-specic conditions.
Structure
At least once per year:
• Inspect the mounting structure for corrosion, loose bolts, and overall stability.
• Check the connections of the earth ground wires, if accessible.
Earth Ground Resistance
At least once per year ensure earth ground resistance meets local and national codes.
Note: Ground meters for this test are available for purchase from Daktronics.
Note: Before removing the fan, take note of the orientation of the arrows on the side of
the fan housing.