THOMSON IOX Series, DCX Series Maintenance Manual

Technical Service Bulletin 040402

IOX-DCX Maintenance Manual

This service bulletin provides instructions on how to construct your own IOX-DCX Maintenance Manual. The following pages contain a front cover page, rear cover page, title page, table of contents, and a binder spine label. A brief introductory chapter explaining the structure and philosophy of the manual is also included.

When these elements are combined with a 2-1/2" three-ring binder and chapter dividers you supply, the result is an attractive maintenance manual to complement the instruction manual set originally provided with your transmitter.

Thomson Broadcast & Multimedia, Inc. 104 Feeding Hills Road Southwick, MA 01077 U.S.A. (800) 345-9295 Attn: Customer Service

REV C - 12 October 2005 1

IOX

®

/ DCX® Series

UHF-TV Transmitter

Maintenance Manual

Document Number: 453265-01 Revision: F Date: October 12, 2005

®

IOX

and DCX® are Trademarks and Registered Trademarks of Thomson Broadcast & Multimedia, Inc.

No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, except as may be expressly permitted in writing by Thomson Broadcast and Multimedia, Inc.

Information provided by Thomson Broadcast and Multimedia, Inc. is intended and believed to be accurate; however, no liability can be assumed for its use. Materials, designs, and specifications are subject to change without notice.

For technical support call 1-800-345-9295 or log on to our web site at http://csg.us.thales-bm.com

Manufactured in the United States of America

.

i IOX® / DCX® Series UHF-TV Transmitter Maintenance Manual

Table of Contents

INTRODUCTION

1. IOX and DCX Performance Pyramids (procedural bulletins)

030523 Setup of IOX Video Processing 030524 Adjustment of IOT Filaments 030525 Adjustment of IOT Bias Voltage and Idle Current 030527 IOX Carrier Frequency Measurement and Adjustment 030528 IOX Tuning with Sideband Adapter 030529 Calibrate HPA Forward and Reverse Power Meters 030530 Calibrate IOX system Forward and Reverse Power Meters 030531 IOX AGC Setup Procedure 030601 Adjustment of IOX Aural Carrier Power 030602 Adjustment of IOX LF Linearity, ICPM, (Intermodulation) Precorrection circuits 030603 Adjustment of IOX Differential Gain and differential Phase Precorrection circuits 030604 Adjustment of IOC B3 ICPM and Aural Carrier Correction Circuits 030605 Adjustment of Crowbar Filament Voltage 030606 IOX/DCX Interlock Check Procedure 030607 Calibration of IOX HPA Drive Power Meter 030608 Calibration of IOX/DCX Grid Voltage and Current Meters 030609 Calibration of IOX/DCX Ion Voltage and Current Meters 030610 Calibration of IOX/DCX Body Current Meter 030611 Calibration of IOX/DCX Beam Voltage and Current Meters

ii IOX® / DCX® Series UHF-TV Transmitter Maintenance Manual

030612 Calibration of IOX/DCX Focus Voltage and Current Meters 030615 IOT Tuning with Network Analyzer or Tracking Generator 030616 Calibration of DCX HPA Power Meters 030617 Calibration of DCX System Power Meters 030624 DCX AGC Setup Procedure 030626 Recommended NTSC Test Equipment Setup 030629 Cooling System Flush Procedure 030633 ADAPT Frequency Adjustment 040125 ADAPT Exciter AGC Setup: DCX and Advantage 040126 Advanced ADAPT Correction Procedure 040503 Emergency PLC Bypass Procedure 040704 IOX/DCX HPA Controller Backplane Replacement 040705 Periodic Flow Meter Testing Alert 040831 Troubleshooting Crowbar Events: IOX/DCX 940911 High Voltage Safety Guidelines 990611 Periodic Crowbar Testing

2. 030328 IOX/DCX Troubleshooting Table

3. Other Service Bulletins

IOX® / DCX® Series UHF-TV Transmitter Maintenance Manual

INTRODUCTION

This manual provides extensive information and procedures on the maintenance of Thomson IOX and DCX transmitters. It is a compilation of individual service bulletins and troubleshooting tables released and maintained by Thomson Broadcast and Multimedia. Because this information is periodically subject to updates and revisions, the modular construction of this manual allows individual bulletins to be replaced, as needed. A version code and date at the bottom of each bulletin permits easy verification of its revision status.

Updated bulletins may be obtained by contacting Thomson Customer Service at 1-800-3459295 or by visiting our download site at http://csg.us.thales-bm.com.

The manual contains three principal sections:

1. The IOX and DCX Performance Pyramids

• The first section contains the main body of service bulletins addressing IOX and DCX maintenance procedures. All bulletins are each numbered for referencing and identification. A logical pyramid diagram shows the interrelation of one bulletin to another.

2. The IOX/DCX Troubleshooting Table (030328)

• The IOX/DCX Troubleshooting Table (030328) provides vital information for the rapid diagnosis of various fault conditions. The table attempts to be encyclopedic in nature, covering a wide variety of problems seen in the field -- from the widespread and relatively benign to the extremely rare and serious. All IOX and DCX users are strongly encouraged to skim the table periodically and be familiar with its contents before a fault condition occurs. The table is frequently updated with information supplied by customers, field service engineers, and the Thomson Customer Service Department.

3. Other Service Bulletins (section for collecting any other pertinent service bulletins)

•

Thomson frequently issues service bulletins addressing product upgrades or other technical information of which the customer should be aware. The final section of this manual provides a location to store those service bulletins that do not belong to the core of procedural bulletins contained in section 1.

IOX® / DCX® Series UHF-TV Transmitter Maintenance Manual

INSERT CHAPTER DIVIDER 1 HERE and DISCARD THIS PAGE

IOX® / DCX® Series UHF-TV Transmitter Maintenance Manual

1. IOX and DCX Performance Pyramids

The main section of this manual is based on a "performance pyramid" concept. The IOX performance pyramid is shown in Figure 1 on the following page. The pyramid shows the relational interdependence between the various procedures contained in this section. The numbers in parenthesis indicate the service bulletin addressing the procedure described.

As in the case of a real pyramid, the stability of the upper levels depends on the levels below. Accordingly, as per Figure 1, the filament, body, focus, bias, etc. meters should be properly calibrated before the high voltage is activated and the crowbar test fired; the crowbar should be successfully test fired before the high voltage is connected to the tube and the idle current adjusted; the idle current should be correctly adjusted before IOT tuning is attempted, and so forth.

By starting at the lowest levels of the pyramid and climbing progressively upwards, it possible to perform a complete verification of the entire transmitter, as was done when the transmitter was originally commissioned. When used in this manner, the pyramid can serve as a suggested procedure for a yearly transmitter check-up.

During routine maintenance periods, the pyramid alerts the reader to possible consequences from making a given adjustment. Generally speaking, an adjustment at a lower level in the pyramid may require that many or all of the levels above it be readjusted (e.g. a change in the aural power ratio may dictate a readjustment of the linearity & ICPM correctors, differential phase & gain correctors, and aural carrier & B3 ICPM correctors).

The performance pyramid for the DCX series of ATSC transmitter is contained in Figure 2.

WARNING: A television transmitter is a complex piece of telecommunications equipment. Only properly qualified personnel should attempt any of the procedures contained in this manual. Users should fully read and understand the intent and theory of all of the procedures contained in this manual, and the general principles of operation of the entire transmitter, before attempting to make any adjustments.

Additionally, users should ensure that they have the required test equipement and/or tools to complete a procedure before starting. IOX customers should consult Service Bulletin 030626 for a list of recommended NTSC test equipment.

DANGER: The IOX/DCX series of transmitters employ potentially lethal high voltage. Proper high voltage safety precauations should be employed at all times when performing the procedures contained in this manual. Please consult Service Bulletin 940911 for more details.

IOX® / DCX® Series UHF-TV Transmitter Maintenance Manual

Aural carrier & B3

Linearity, ICPM, and IMD correctors (030602)

Aural power ratio (030601)

AGC alignment and adjustment (030531)

IOT tuning 030528 (or 030615)

Beam meters cal (030611) Bias volts and idle current adjust (030525)

Crowbar test firing (990611)

Filament

meters cal

(030524)

Body meter

cal

(030610)

HPA power meters

cal (030529)

meters cal

(030612)

ICPM correctors

Focus

(030604)

System power

meters cal (030530)

Bias meters

cal

(030608)

Differential phase &

gain correctors

(030603)

Driver power meter

cal (030607)

Ion meters

cal

(030609)

Crowbar fil.

(030605)

adjust

Interlock

checks

(030606)

Frequency

check

(030527)

IOX video

setup

(030523)

Figure 1. IOX Performance Pyramid

Advanced ADAPT correction procedure (040126)

AGC alignment and adjustment (040125) (or 030624)

IOT tuning (030529)

Beam meters cal (030611) Bias volts and idle current adjust (030525)

Crowbar test firing (990611)

Filament

meters cal

(030524)

Body meter cal (030610)

HPA power meters cal

(030616)

Focus

meters cal

(030612)

Bias meters

cal (030608)

System power meters cal

(030617)

Ion meters

cal (030609)

Crowbar fil.

adjust

(030605)

Interlock

checks

(030606)

Frequency

check

(030633)

Figure 2. DCX Performance Pyramid.

IOX® / DCX® Series UHF-TV Transmitter Maintenance Manual

INSERT PROCEDURAL BULLETINS HERE and DISCARD THIS PAGE

030523 Setup of IOX Video Processing 030524 Adjustment of IOT Filaments 030525 Adjustment of IOT Bias Voltage and Idle Current 030527 IOX Carrier Frequency Measurement and Adjustment 030528 IOX Tuning with Sideband Adapter 030529 Calibrate HPA Forward and Reverse Power Meters 030530 Calibrate IOX system Forward and Reverse Power Meters 030531 IOX AGC Setup Procedure 030601 Adjustment of IOX Aural Carrier Power 030602 Adjustment of IOX LF Linearity, ICPM, (Intermodulation) Precorrection circuits 030603 Adjustment of IOX Differential Gain and differential Phase Precorrection circuits 030604 Adjustment of IOC B3 ICPM and Aural Carrier Correction Circuits 030605 Adjustment of Crowbar Filament Voltage 030606 IOX/DCX Interlock Check Procedure 030607 Calibration of IOX HPA Drive Power Meter 030608 Calibration of IOX/DCX Grid Voltage and Current Meters 030609 Calibration of IOX/DCX Ion Voltage and Current Meters 030610 Calibration of IOX/DCX Body Current Meter 030611 Calibration of IOX/DCX Beam Voltage and Current Meters 030612 Calibration of IOX/DCX Focus Voltage and Current Meters 030615 IOT Tuning with Network Analyzer or Tracking Generator 030616 Calibration of DCX HPA Power Meters 030617 Calibration of DCX System Power Meters 030624 DCX AGC Setup Procedure 030626 Recommended NTSC Test Equipment Setup 030629 Cooling System Flush Procedure 030633 ADAPT Frequency Adjustment 040125 ADAPT Exciter AGC Setup: DCX and Advantage 040126 Advanced ADAPT Correction Procedure

IOX® / DCX® Series UHF-TV Transmitter Maintenance Manual

040503 Emergency PLC Bypass Procedure 040704 IOX/DCX HPA Controller Backplane Replacement 040705 Periodic Flow Meter Testing Alert 040831 Troubleshooting Crowbar Events: IOX/DCX 940911 High Voltage Safety Guidelines 990611 Periodic Crowbar Testing

IOX® / DCX® Series UHF-TV Transmitter Maintenance Manual

INSERT CHAPTER DIVIDER 2 and 030328 IOX/DCX Troubleshooting Table HERE and DISCARD THIS PAGE

IOX® / DCX® Series UHF-TV Transmitter Maintenance Manual

INSERT CHAPTER DIVIDER 3 and OTHER SERVICE BULLETINS & REFERENCE INFORMATION HERE and DISCARD THIS PAGE

Thomson Broadcast & Multimedia, Inc. 104 Feeding Hills Road Southwick, MA 01077 U.S.A. (800) 345-9295 Attn: Customer Service

http://csg.us.thales-bm.com

®

er

Maintenance

®/

IOX

DCX®

Series

UHF-TV

Transmitter

2-1/2" 3-ring Binder

Cut along dotted line

®/

IOX

DCX

Series

UHF-TV

Transmitt

Manual

Document Number

453265-01

Maintenance

Cut along dotted line

Document Number

Manual

453265-01