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