Daktronics CH-1421V User Manual

Auto Racing Display

Model CH-1421V

Installation & Maintenance Manual

ED 6401

ED-6401
Project#1081
Rev. 2 - 10 August, 1998

Copyright © 1992 Daktronics, Inc.

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.

DA
KTRONICS, INC.

Setting New Standards Worldwide

P.O. Box 5128 331 32nd Ave. Brookings, SD 57006
Phone [phone] or [phone] Fax [phone]

Table of Contents

1. Introduction .............................................................................................................1-1

1.1 How To Use This Manual ..........................................................................................1-1

1.2 Scoreboard Overview.................................................................................................1-1

2. Installation ...............................................................................................................2-1

2.1 General System...........................................................................................................2-1

2.2 General System...........................................................................................................2-1

2.3 Display Mounting.......................................................................................................2-2

2.4 Electrical Installation..................................................................................................2-3

2.4.1 Control Signal Wiring...................................................................................2-3

2.4.2 Power Wiring ................................................................................................2-3

2.4.3 Grounding......................................................................................................2-3

3. Maintenance & Troubleshooting............................................................................3-1

3.1 Lamp Replacement.....................................................................................................3-1

3.2 Lamp Driver...............................................................................................................3-1

3.3 Digit Segmentation.....................................................................................................3-2

3.4 Schematic ...................................................................................................................3-2

3.5 Troubleshooting .........................................................................................................3-2

3.6 Replacement Parts......................................................................................................3-3

3.7 Unit Exchange/Replacement Procedure.....................................................................3-3

Table of Contents i

Section 1 : Introduction

1.1 How To Use This Manual

This manual explains the installation and maintenance of the CH-1421V display system.
Setup of other control equipment or operation of the CHTS-300 timing console are not
covered in this manual. For questions regarding the safety, installation, operation or service
of this system, please refer to the telephone numbers listed on the cover page of this manual.

Important Safeguards:

1. Read and understand these instructions before installing.

2. Do not drop the control console or allow it to get wet.

3. Be sure the display is properly grounded with a ground rod at the display location.

4. Disconnect power to the display when it is not in use.

5. Disconnect power when servicing the display.

6. Do not modify the display structure or attach any panels or coverings to the

display without the written consent of Daktronics, Inc.

The box below illustrates Daktronics drawing numbering system. The drawing number
“7087-P08A-69945” is how Daktronics identifies individual drawings. This number is
located in the lower-right corner of the drawing. This manual refers to drawings by listing the
last set of digits and the letter preceding them. In the example below, the drawing would be
referred to as Drawing A-69945. Referenced drawings are inserted at the end of the first
section which references them.

1.2 Scoreboard Overview

Reference Drawing: Specifications Drawing; CH-1421V .............Drawing A-106019

Daktronics offers a wide variety of displays for oval and road tracks. The CH-1421V auto
racing display shown in Drawing A-106019 displays lap number or elapsed race time, the top
five racers and race status.

Introduction

1-1

Section 2 : Installation

2.1 General System

Reference Drawings: Driver Enclosure, Power & Signal ...............Drawing A-37915

System Layout ............................................Drawing A-38865

Power wiring and grounding .......................Drawing A-45220

Color Code, 25-Pin J-Box ...........................Drawing A-47207

Shop Dwg, Mounting Details.......................Drawing A-49278

Component Numbering, CH-1421V..........Drawing A-106020

An illustration of the overall system layout for the CH-1421V is shown in Drawing A-38865.
A typical installation depicting beams, footings, and wiring conduit is illustrated in Drawing

A-49278. The general procedure for installing the CH-1421V display is as follows:

1. Select beam and footing recommendations from the table below.

2. Dig the footing holes and install beams and footings.

3. Route power and signal cables to the display and control locations as described in Section

2.4.

4. Mount the display to the beams as described in Drawing A-49278.

5. Route power and signal wires into the display as described in Drawings A-37915, A­38865, A-45220, A-47207, and A-106020.

2.2 General System

Reference Drawing: Shop Dwg, Mounting Details.........................Drawing A-49278

The table below contains recommendations for W-shape beams and footings to support the
display. Refer to Drawing A-49278. The first column is wind velocity in miles per hour.
The distance in the second column is from the ground to the bottom of the display. The
choice from these columns depends upon the display location.

The beams listed below are beams which provide maximum wind load strength for the weight
and cost of the beams.

Wind

Speed

70 mph 10 W8 x 15 4 ¾ ft x 3 ft

15 W6 x 20 5 ½ ft x 3 ft

80 mph 10 W8 x 15 5 ½ ft x 3 ft

15 W8 x 20 6 ¾ ft x 3 ft

90 mph 10 W8 x 17 6 ¼ ft x 3 ft

15 W8 x 24 7 ft x 3 ft

The calculations for footing diameters and depths are based on the assumption that footings
are in undisturbed soils, not fill soils. Lateral bearing capacity of 300 psf per foot of depth in
natural grade was used to derive these figures.
The footings recommendations are based on the allowable soil bearing pressure of 3000 psf
vertically and 300 psf/ft of depth horizontally. However, these recommendations are
suggestions only and soil bearing pressure at the site must be determined by a sample test

Installation

Height

(ft)

Beam

Section

Footing

Depth x Dia.

2-1

prior to specifying the actual footings. Be sure that the installation complies with local codes
and is suitable for particular soil and wind conditions. Daktronics assumes no responsibility
for displays installed by others. Daktronics
used for beams, and that 28-day (strength 3000 psi) concrete be used for footings.

A note about beam nomenclature: For a typical beam, W8x24 for example, “W” stands for
“Wide-Flange Beam”. The first number (8) is the approximate front to rear dimension of the
beam in inches. The second number (24) is the weight per foot in pounds. This numbering is
a standard in the steel industry. Widths are from 6.00 to 8.125 inches in the chart above.

Note: Recommendations for a single rectangular structural steel tube and footing to support
the display as shown in Drawing A-49278 must be determined by a qualified structural
engineer using data from a soil sample test at the site.

2.3 Display Mounting

Reference Drawing: Shop Dwg, Mounting Details.........................Drawing A-49278

Drawing A-49278 shows the typical mounting for the display.

Note: The bolts that secure the display to the beam(s) do not go through the beam(s), but run

along both sides of the beam, clamping the display to the beam(s).

A mounting kit consisting of mounting angles and ½” hardware are provided to mount the
display.

1. Locate and mark where the center of the beams will be on the back of the display
mounting channel if it is different from the c-c distance shown in Drawing A-49278 and
the table above.

2. Drill 9/16” holes in the mounting channel on the back of the display at a distance of plus
or minus 3.50” or 4.50” from the location which each beam center was marked if it is
different from the c-c distance shown in Drawing A-49278 and the table above.

3. Position the display at the front of the beams with the threaded rods extending from the
rear of the mounting channels, straddling the beams. Raise the display to the desired
height.

4. Slide clamping channels over the ends of the rods and loosely install washers and nuts.

5. Make final adjustments in the positioning of the display.

6. Make sure that the threaded rods are perpendicular to the display and tighten all of the ½”

nuts.

recommends that W-sections of grade 36 steel be

2-2

Installation

2.4 Electrical Installation

2.4.1 Control Signal Wiring

Reference Drawings: Color Code, 25-Pin J-Box.................Drawing A-47207

For the display, two conductors of 24 AWG are needed. For distances up to 600 ft. or
22 AWG, up to 1000 ft. are required. Daktronics has 24 AWG direct burial cable,
Daktronics part no. W-1105 with 6 conductors, and 22 AWG cable that must be
pulled through the conduit before burial, Daktronics part no. W-1077 with 2
conductors.

At the control location, mount the signal J-box to a convenient location. Route the
cables and connect to the wires leading from the connector in the cover according to
the table below and Drawing A-47207.

At the display, open the bottom hinged panel covering the entrance enclosure as
shown on Drawing A-106020. Remove the cover from the entrance enclosure. Refer
to Drawing A-47207 for an illustration of the components inside the entrance
enclosure. Connect the signal wires to TB31 as indicated in the table below.

Control End Display End

J-box Terminal No. Wire Color Output No. TB31 Terminal No.

14 Red/Wht 1* 1 (+)
15 Grn/Wht 2 (-)

*Auxiliary display(s) require(s) a different output no.(s). Consult your CHTS-300 console
manual.

2.4.2 Power Wiring

Reference Drawing: Driver Enclosure, Power & Signal......Drawing A-37915

The CH-1318V display requires a 120/240 VAC, 30 amp circuit per line. When
equipped with 25W lamps, the maximum current draw is 33.33 amps. When
equipped with 30 W reflector lamps, the maximum current draw is 40 amps.

Route power wires into the display and connect to TB41 in the entrance enclosure, as
shown on Drawing A-37915.

Connect the ground wire to E41 and to a ground rod near the display, according to the
local codes.

2.4.3 Grounding

Reference Drawing: Power Wiring and Grounding.............Drawing A-45220

The display must be connected to an earth-ground. Proper grounding is necessary for
reliable equipment operation. It also serves to provide protection to the equipment
against damaging electrical disturbances and lightning. If the following grounding
methods are not adhered to, the warranty will be void.

Component Numbering,CH-1421V..DrawingA-106020

Installation

2-3

The steel support structure for the display cannot be used as grounding. The support
is generally imbedded in concrete, and if in earth, the steel is either primed or it
corrodes making it a poor ground. Use one ground rod at each scoreboard support
column.

The National Electrical Code requires the use of lockable power disconnect near the
display. Provide a lockable disconnect switch (knife switch) at the display location so
that all power lines can be completely disconnected. Use a 3-conductor disconnect so
that both hot lines and the neutral can all be disconnected. This is important in
protecting the display against lightning.

There are two considerations for power installation, New Power Installation and
Existing Power Installation. These two power installations differ slightly, as
described below.

New Power Installation: The power cable must contain a separate earth-ground
conductor. When a separate ground conductor is used, do not connect neutral to
ground at the disconnect or at the display. To do so would violate electrical codes and
void the warranty. Refer to Drawing A-45220.

Existing Power Installation: When a separate ground conductor is not available,
connect the neutral to the earth-ground at the disconnect. Refer to Drawing A-45220.

2-4

Installation

Section 3 : Maintenance & Troubleshooting

IMPORTANT NOTES:

1. Disconnect power before any repair or maintenance work is done on the
display!

2. Any access to internal display electronics must be made by qualified
service personnel.

3. Disconnect power when the display is not in use.

3.1 Lamp Replacement

Reference Drawing: Digit Service ..................................................Drawing A-27674

The primary service required by the CH-1421V display is to replace burned-out lamps. Refer
to Drawing A-27674 for an illustration of lamp changing. Digit lamps are 25W, 120 volt,
Daktronics part number DS-1029. Some displays may be equipped with 30W, 120 volt digit
lamps, Daktronics part number DS-1126. Lamps may be bought at your local store or directly
from Daktronics.

Do not use lamps larger than those originally installed in the display. Using higher powered
lamps will likely cause fuse failures in the display and could exceed the current levels that the
display’s circuits can safely handle.

3.2 Lamp Driver

Reference Drawings: Lamp Driver, 16 Col., w/ Fan.......................Drawing A-37070

Component Numbering,CH-1421V...........Drawing A-106020

In the display, the task of switching lamps on and off is performed by the lamp driver.

Drawing A-106020 in Section 2 shows the location of the lamp driver in the display.
Drawing A-37070 is an illustration of the lamp driver and the fuses located in it.

The lamp driver has 21 connectors, providing power and signal inputs and outputs to digits.
The functions of these connectors are as follows:

Connector Number Function

1-16 Outputs to digits

17 Signal Input
18 Power input for outputs 1-8 (120 V)
19 Power input for driver logic and fan (120V)
20 Power input for outputs 9-16 (120V)
24 Dim option selector

In Drawing A-106020, the numbers on the digits refer to the lamp driver output connector
wired to each digit.

Maintenance & Troubleshooting

3-1

3.3 Digit Segmentation

Reference Drawing: Segments, 4x7 Lamp Matrix Digit..................Drawing A-37685

In a digit certain lamps always go on and off together. These groupings of lamps are known
as “segments”. Each digit has eight segments, referred to by letters A through H. Drawing
A-37685 illustrates these segments and shows which connector pin and wire color is wired to
each segment.

3.4 Schematic

Reference Drawings: Schematic, 1 Driver Display ........................Drawing A-38788

The schematic diagram in Drawing A-38788 shows the power and signal inputs into the
display and to the lamp driver. The component numbers correspond to those shown on
Drawings A-106020 and A-46755.

3.5 Troubleshooting

This section lists some symptoms that may be encountered with the CH-1421V display. For
these symptoms, possible causes and corrective actions are indicated. This list does not
include every possible problem, but does represent some of the more common situations that
may occur.

Observed Problem Possible Cause

One lamp won’t light

Digit segment won’t light

Entire digit won’t light

Half the display won’t light

Entire display won’t light

Segment stays lit

Garbled display

Pwr/Sig Entrance, 1 Driver Display.............Drawing A-46755

Component Numbering,CH-1421V...........Drawing A-106020

• Burned-out lamp

• Broken wire behind digit

• Broken wire

• Poor contact at driver connector

• Internal driver malfunction

• Broken wire (black)

• Poor contact at connector, pin 7

• Fuse blown in driver

• Service breaker tripped

• Main fuse blown

• Poor contact at main power connection

• P18 disconnected

• Power disruptions

• Poor signal connection

• Driver logic fuse blown

• Control not connected to display

• P20 disconnected

• Broken wire behind digit

• Internal driver malfunction

• Control malfunction

• Internal driver malfunction

3-2

Maintenance & Troubleshooting

If a problem is observed in one digit, the cause may be isolated by swapping plugs on the
driver (connect the plug from the digit into a different jack). If the same digit shows the same
problem, the cause may be in the digit or the wiring. If the problem moves to another digit,
then the cause is probably an internal driver problem.

Use a volt meter at driver inputs to determine if power is being supplied to the driver. An
ohmmeter can be helpful in finding broken wires and bad connections. Internal electronic
problems must be correct by Daktronics or an authorized service center.

3.6 Replacement Parts

Part Name or Description Type Part Number

Lamp Driver 0A-1033-0122
J-Box, CHTS-300 Timer 0A-1067-0056
Fuse, Lamp Driver, 10A AGC-10 F-1006
Fuse, Driver Logic, 1/2A AGC-1/2 F-1000
Digit Lampbank 0A-1027-0075
Digit Screen, 21” 4x7 0S-1027-0018
Socket, Med. Base X-1046
Lamp, 25W Frosted DS-1029
Lamp, 30W Reflector 30R20 DS-1126
Lamp, 55W Clear Flood 55PAR38 DS-1101
Lamp, 85W Amber Flood 85PAR38 DS-1184
Lamp, 85W Green Flood 85PAR38 DS-1185
Lamp, 85W Red Flood 85PAR38 DS-1186

3.7 Unit Exchange/Replacement Procedure

Daktronics unique exchange program offers our clients the quickest, most economical way of
receiving product repairs. If a component fails, Daktronics will send the customer a
replacement. The customer, in turn, sends the failed component to Daktronics. This not only
saves money but decreases the time the display is inoperable. Daktronics offers repair and
return on a timely basis; in urgent situations, every attempt is made to ship by the fastest
transit method available.

1. Packaging for Return: Package and pad the item well to prevent damage during

shipment. Electronic components, such as printed circuit boards, should either be
installed in an enclosure or placed in an anti-static bag before boxing.

Please enclose your name and address along with a list of all the symptoms. Please be

as specific as possible.

2. Driver Packaging Instructions: Drivers should be placed in a static-free enclosure

for return shipping. An anti-static convoluted foam packing is available from
Daktronics (part number PK-1135). The shipping box (Daktronics part number PK-

1006) should be used along with the foam.

3. Where to Send: Contact your local representative prior to shipment to acquire a

Return Material Authorization Number (RMA#). This will speed up the repair of
your unit.

Maintenance & Troubleshooting

3-3

When returning defective items under the exchange program, please use the UPS Blue
Return Tags found in the package containing the exchange unit sent from Daktronics.
This will speed up the transaction and help avoid confusion when the part is returned
to Daktronics. The defective item must be returned within 15 days of receiving a
replacement part. Using the UPS Blue Return Tag immediately will eliminate the
possibility of late charges being assessed against your account.

Mail: Daktronics, Inc., Customer Service
PO Box 5128
331 32

nd

Avenue

Brookings, SD 57006

Phone: Toll Free: 1-800-843-9879
or 1-605-697-4400

Customer Service Fax: [phone]

E-Mail: [e-mail]

3-4

Maintenance & Troubleshooting