Operating and Safety Instructions Chapter 1

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500-Watt VHF Transmitter Chapter 1, Introduction

425A, Rev. 0 1-1

Chapter 1

Introduction

This manual explains the installation,

setup, alignment, and maintenance

procedures for the 425A 500-watt solid

state VHF transmitter. It is important

that you read all of the instructions,

especially the safety information in this

chapter, before you begin to install or

operate the unit.

1.1 Manual Overview

This instruction manual is divided into

five chapters and supporting appendices.

Chapter 1, Introduction, contains

information on the assembly numbering

system used in the manual, safety,

maintenance, return procedures, and

warranties. The second chapter describes

the transmitter and includes discussions

on system control and status indicators

and remote control connections. Chapter

3 contains a detailed discussion of the

circuits and boards that make up the

425A transmitter. Chapter 4 explains

how to unpack, install, setup, and

operate the transmitter. Chapter 5,

Detailed Alignment Procedures, provides

information on adjusting the system to

achieve peak operation of the

assemblies. The appendices contain a

sample log sheet, assembly and

subassembly drawings, and system

specifications.

1.2 Assembly Designation Procedure

ADC has assigned assembly numbers,

such as Ax (x=1,2,3…), to all assemblies,

trays, and boards that are referenced in

the text of this manual and shown on the

block diagrams and interconnect

drawings provided in the appendices.

These supporting documents are

arranged in increasing numerical order in

the appendices. Section titles in the text

for assembly or tray descriptions or

alignment procedures also indicate the

associated drawing(s) and the relevant

appendix that contains the drawing.

Sections describing vendor-supplied

items, such as meters and power

supplies, do not contain this information.

1.3 Safety

The VHF transmitters manufactured by

the Broadcast Systems Division of ADC

are designed to be easy to use and repair

while providing protection from electrical

and mechanical hazards. Listed

throughout the manual are notes,

cautions, and warnings concerning

possible safety hazards that may be

encountered while operating or servicing

the transmitter. Please review these

warnings and familiarize yourself with the

operation and servicing procedures

before working on the transmitter.

Read All Instructions

– All of the

operating and safety instructions should

be read and understood before operating

this equipment.

Retain Manuals

– The manuals for the

transmitter should be retained at the

transmitter site for future reference. We

provide two sets of manuals for this

purpose; one set can be left at the office

while one set can be kept at the site.

Heed all Notes, Warnings, and

Cautions

– All of the notes, warnings,

and cautions listed in this safety section

and throughout the manual must be

followed.

Follow Instructions

– All of the

operating and use instructions for the

transmitter should be followed.

Cleaning

– Unplug or otherwise

disconnect all power from the equipment

before cleaning. Do not use liquid or

aerosol cleaners. Use a damp cloth for

cleaning.

Summary of content (3 pages)

PAGE 1
500-Watt VHF Transmitter Chapter 1, Introduction Chapter 1 Introduction This manual explains the installation, setup, alignment, and maintenance procedures for the 425A 500-watt solid state VHF transmitter. It is important that you read all of the instructions, especially the safety information in this chapter, before you begin to install or operate the unit. Sections describing vendor-supplied items, such as meters and power supplies, do not contain this information. 1.
PAGE 2
500-Watt VHF Transmitter Chapter 1, Introduction Ventilation – Openings in the cabinets and tray front panels are provided for ventilation. To ensure reliable operation of the transmitter, and to protect the unit from overheating, these openings must not be blocked. boards. Water-based cleaners can be used, but do not saturate the components. The fans and heatsinks should be cleaned of all dust or dirt to permit the free flow of air for cooling purposes.
PAGE 3
500-Watt VHF Transmitter Chapter 1, Introduction Failure to close out this type of MRA# will normally result in the customer being invoiced for the value of the loaner item or the exchange assembly.