Daktronics CH-836H User Manual

Auto Racing Display

Model CH-836H

Installation & Service Manual

ED 5965

ED 5965
Project#1081
Rev. 3 - 30 July 1998

Copyright © 1991 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 Display Overview ............................................................................................................1-1

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

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

2.2 Beam and Footing Selection............................................................................................2-1

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

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

2.4.1 Control Signal Cable...........................................................................................2-3

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

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

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

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

3.3 Digit Segmentation..........................................................................................................3-1

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

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

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

3.9 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 Daktronics CH-836H Auto Racing
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 “7087­P08A-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 Display Overview

Reference Drawing: Display, CH-836H..........................................Drawing A-47099

Drawing A-47099 shows a Daktronics CH-836H display. The CH-836H display along with the
use of the Daktronics CHTS-300 timing console will display the first three car positions and lap
number on the display.

Introduction 1-1

Section 2 : Installation

2.1 General System

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

System Layout, CH-836..............................Drawing A-47101

Display Splice Mounting Detail, CH-836H ..Drawing A-47102

Display Mounting, CH-836H .......................Drawing A-47108

Installation Specifications, CH-836H...........Drawing A-47109

Component Locations, CH-836H................Drawing A-47112

Connector Plate, CH-836H.........................Drawing A-47128

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

Refer to Drawing A-47101 for the general system layout.

The general procedure for installing the CH-836H display is as follows:

1. Select beam and footing recommendations from the table in Section 2.2.

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

3. Route power and signal cables to the display and control locations.

4. Mount the displays to the beams as described in Drawings A-47102, A-47108, and A-47109
and Section 2.3.

5. Route power and signal wires into the displays as described in Drawings A-46755, A-47112,
A-47128, and A-47207 and Section 2.4.

2.2 Beam and Footing Selection

Reference Drawings: Installation Specifications, CH-836H ...........Drawing A-47109

The table below contains recommendations for W-shape beams and footings to support the
display as shown in Drawing A-47109. 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 Height (ft) Beam

70 10 W 10x19 7 ½ ftx3 ft

MPH 15 W 10x25 8 ¼ ftx3 ft

80 10 W 10x25 8 ½ ftx3 ft

MPH 15 W 10x29 9 ¼ ftx3 ft

90 10 W 14x26 9 ½ ftx3 ft

MPH 15 W 12x31 10 ½ ftx3 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.

Section

Footing Depth x

Diameter

Installation

2-1

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 prior to specifying
actual footings. Be sure that the installation complies with local codes and is suitable for the
particular soil and wind conditions. Daktronics assumes no responsibility for displays installed
by others. Daktronics recommends that W-sections of grade 36 steel be used for beams, and that
28-day (strength 3000 psi) concrete be used for footings.

A note about beam nomenclature: For a typical beam, W6 x 25 for example, "W" stands for
"Wide-Flange Beam". The first number (6) is the approximate front to rear dimension of the
beam in inches. The second number (25) is the weight per foot in pounds. This numbering is a
standard in the steel industry. Widths are from 6.25 to 10.25 inches in the chart above.

2.3 Display Mounting

Reference Drawings: Display Splice Mounting Detail, CH-836H...Draw ing A-47102

Drawing A-47108 shows the typical mounting for the display.

Note: The bolts that secure the display to the beams do not go through the beams, but run along

both sides of the beam, clamping the display to the beams.

A mounting kit consisting of six (6) mounting angles, two (2) splice channels and 1/2" hardware
are provided to mount the display.

1. Position the left display section against the mounting beams and secure the bottom of the
display to both beams as shown in Drawing A-47108.

2. Secure the top of the display section to the beams. Once mounting angles are attached, the
display section may be slid up or down to the desired height.

3. Tighten all nuts securely once the display is positioned as desired.

4. Position the right display section next to the left display section and secure to the beam,

repeating the procedure that was used to secure the left display section.

Attach the two (2) splice channels at the top and bottom of the display where the two display
sections meet to secure the two sections together as shown in Drawing A-47102.

Display Mounting, CH-836H .......................Drawing A-47108

2-2

Installation

2.4 Electrical Installation

2.4.1 Control Signal Cable

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

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 J-box cover, according to the
table below and Drawing A-47207.

At the display, open the hinged panel covering the entrance enclosure as shown in

Drawing A-47112. Remove the cover from the entrance enclosure. Refer to Drawing
A-46755 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 number(s). Consult the CHTS-300 console
manual.

2.4.2 Power Wiring

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

The CH-836H 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 30W
30R20 reflector lamps, the maximum current draw is 40 amps.

Route the power wires into the display and connect to TB41 in the entrance enclosure, as
shown in Drawing A-46755.

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

Component Locations, CH-836H....Drawing A-47112

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

Installation

2-3

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-836H display is to replace burn-out lamps. Refer to
Drawing A-27674 for an illustration of lamp changing. Replacement lamps are 120V, 25W
frosted, medium base, available at your local store or directly from Daktronics, part number
DS-1029. Some displays may be equipped with 120V, 30W reflector type 30R20 lamps,
Daktronics part number DS-1126.

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 Locations, CH-836H................Drawing A-47112

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

Drawing A-47112 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-47112, the numbers on the digits refer to the lamp driver output connector
wired to each digit.

3.3 Digit Segmentation

Maintenance & Troubleshooting

3-1

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-46754

The schematic diagram in Drawing A-46754 shows the power and signal inputs into the
display and to the lamp driver. The component numbers correspond to those shown in
Drawings A-47112 and A-46755.

3.5 Troubleshooting

This is a list of possible problems that may occur and their possible solutions. For these
symptoms, possible cause 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 Locations, CH-836H................Drawing A-47112

• 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 disruption

• 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 corrected 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, Main Power, 20 A FNW-20 F-1016
Fuse, Lamp Driver, 10A AGC-10 F-1006
Fuse, Driver Logic, 1/2A AGC-1/2 F-1000
Digit Lampbank, 36” 4x7 0A-1081-0038
Digit Screen, 36” 4x7 0S-1081-0038
Socket, Med. Base X-1046
Lamp, 25W Frosted DS-1029
Lamp, 30 W Frosted, Reflector 30R20 DS-1126

3.9 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.

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

Maintenance & Troubleshooting

3-3

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