Tektronix RTX130B Service Manual

Service Manual

RTX130B
QAM & VSB RF Signal Generator

071-1935-00

Warnin g

The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.

www.tektronix.com

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or
suppliers, and are protected by national copyright laws and international treat y provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication superc edes
that in all previously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA

For product information, sales, service, and technical support:

H In North America, call 1-800-833-9200.

H Worldwide, visit www.tektronix.com to find contacts in your area.

Warranty 2

Tektronix warrants that this product will be free from defe cts in materials and workmanship for a period of one (1) year
from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either
will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the
defective product. Batteries are excluded from this warranty. Parts, modules and replacement products used by Tektronix
for warranty work may be new or reconditioned to like new performance. All replaced parts, modules and products become
the property of Tektronix.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by Tektronix, shipping charges prepaid, and
with a copy of customer proof of purchase. Tektronix shall pay for the return of the product to Customer if t he shipment is
to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying
all shipping charges, duties, taxes, and any other charges for products returned to any other locations

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction
caused by the use of non--Tektronix supplies; or d) to service a product that has be en modified or integrated with other
products when the effect of such modification or integration i ncreases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY
OTHER W ARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED W ARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX
AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES

Table of Contents

Specifications

General Safety Summary vii...................................

Service Safety Summary ix....................................

Environmental Consid erations xi...............................

Preface xiii...................................................

Manual Structure xiii................................................

Manual Conventions xiv..............................................

Introduction xv..............................................

Performance Check Interval xv........................................

Strategy for Servicing xv.............................................

Tektronix Service Offerings xvi........................................

Product Overview 1-1.........................................

Specifications 1-3.............................................

Performance Conditions 1-3...........................................

Functional Specifica tions 1-3..........................................

Electrical Specifications 1-4...........................................

Mechanical (Physical) Characteristics 1-12................................

Environmental Chara cteristics 1-12......................................

Certifications and Compliances 1-13.....................................

Theory of Operation

A12 Main Board 2-1.................................................

A20 PCI Backplane Board 2-3.........................................

A180 QAM Modulator Board 2-4......................................

Front-Panel Processor Board 2-6.......................................

Keypad Board 2-7...................................................

A40 AC Distributor Board 2-7.........................................

Performance Verification

Equipment Required 3-1..............................................

RTX130B Test Record 3-3............................................

Procedures 3-4......................................................

RTX130B QAM & VSB RF Signal Generator Service Manual

i

Table of Contents

Maintenance

Related Maintenance Procedures 4-1....................................

Preparation 4-2.....................................................

Inspection and Cleaning 4-3...........................................

Removal and Installation Procedures 4-7.........................

Preparation 4-7.....................................................

Access Procedure 4-14................................................

Procedures for External Modules 4-15...................................

Procedures for Board Modules 4-21......................................

Procedures for Internal Modules 4-26....................................

Verifying the BIOS Configuration 4-33...........................

Procedure 4-33......................................................

Troubleshooting 4-35...........................................

Troubleshooting Trees 4-35............................................

System Software Recovery 4-45..................................

Recovery Procedure 4-45..............................................

Using the Rescue Disc 4-47......................................

Recovery Procedure 4-47..............................................

Options

Diagrams

Replaceable Parts List

Options 5-1..................................................

Diagrams 6-1.................................................

Parts Ordering Information 7-1.........................................

Using the Replaceable Parts List 7-3....................................

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RTX130B QAM & VSB RF Signal Generator Service Manual

List of Figures

Table of Contents

Figure 1-1: Timing diagram of the SPI interface 1-11................

Figure 2-1: Block diagram of the A180 QAM Modulator board 2-4...

Figure 3-1: Equipment connection for checking the internal clock

output level 3-5............................................

Figure 3-2: Equipment connection for checking the internal clock

frequency 3-6.............................................

Figure 3-3: Equipment connection for checking the play

operation--SPI interface 3-7.................................

Figure 3-4: Equipment connections for checking the external

clock/reference and trigger inputs 3-11.........................

Figure 3-5: Equipment connection for checking the output

signal--ASI interface 3-14....................................

Figure 3-6: Equipment connections for checking the ASI play

operation 3-16.............................................

Figure 3-7: Equipment connection for checking the ASI record

operation 3-17.............................................

Figure 3-8: Equipment connection for checking the recorded

file--ASI interface 3-19.......................................

Figure 3-9: E quipment connection for verifying the 8VSB play

operation 3-20.............................................

Figure 3-10: E quipment connection for verifying the 8VSB record

operation 3-22.............................................

Figure 3-11: Equipment connection for verifying the recorded

file--SMPTE310M interface 3-23..............................

Figure 3-12: Equipment connection for checking the output

for

errors 3-26................................................

Figure3-13:TestsGroupedbyPriority123screen(AnnexA) 3-28....

Figure 3-14: Equipment connection for checking the IEEE 1394b

interface 3-30..............................................

Figure 4-1: RTX130B orientation 4-10.............................

Figure 4-2: External modules 4-11................................

Figure 4-3: Board modules 4-12..................................

Figure 4-4: Internal modules 4-13................................

Figure 4-5: Gu ide to removal procedures 4-14......................

RTX130B QAM & VSB RF Signal Generator Service Manual

iii

Table of Contents

Figure 4-6: Cabinet removal 4-16.................................

Figure 4-7: Right-side and left-side cover removal 4-17...............

Figure 4-8: Front-panel unit removal 4-18.........................

Figure 4-9: Disassembly of front-panel assembly 4-20................

Figure 4-10: A180 QAM Modulator board, A12 Main board, CPU

board, and A20 PCI Back plane board removal 4-22.............

Figure 4-11: H ard disk drive removal 4-27.........................

Figure 4-12: Internal and external fan removal 4-29.................

Figure 4-13: 12 V main power supply and A40 AC Distributor

board removal 4-31.........................................

Figure 4-14: RFI filter removal 4-32..............................

Figure 4-15: Troubleshooting procedure (1) 4-36....................

Figure 4-16: Troubleshooting procedure (2) 4-37....................

Figure 4-17: Troubleshooting procedure (3) 4-38....................

Figure 4-18: Troubleshooting procedure (4) 4-39....................

Figure 4-19: Troubleshooting procedure (5) 4-40....................

Figure 4-20: Troubleshooting procedure (6) 4-41....................

Figure 4-21: Troubleshooting procedure (7) 4-42....................

Figure 4-22: Troubleshooting procedure (8) 4-43....................

Figure 4-23: A20 PCI Backplane board view--back side 4-43..........

Figure 4-24: A20 PCI Backplane board view--right side 4-44..........

Figure 6-1: RTX130B block diagram 6--3..........................

Figure 6-2: RTX130B interconnect diagram 6--5....................

Figure 7-1: Cabinet and covers 7-5..............................

Figure 7-2: Internal modules (1) 7-7.............................

Figure 7-3: Internal modules (2) 7-9.............................

Figure 7-4: Front-panel unit 7-11.................................

Figure 7-5: Cables 7-13.........................................

iv

RTX130B QAM & VSB RF Signal Generator Service Manual

List of Tables

Table of Contents

Table 1-1: Functional specifications 1-3..........................

Table 1-2: Mainframe 1-4......................................

Table 1-3: Mechanical characteristics 1-12.........................

Table 1-4: Environmental characteristics 1-12......................

Table 1-5: Certifications and compliances 1-13.....................

Table 3-1: Equipment required for performance verification 3-1.....

Table 3-2: RTX130B test record 3-3.............................

Table 4-1: External inspection check list 4-4......................

Table 4-2: Internal inspection check list 4-5.......................

Table 4-3: Summary of procedures 4-8..........................

Table 4-4: Tools required for modu le removal 4-9..................

RTX130B QAM & VSB RF Signal Generator Service Manual

v

Table of Contents

vi

RTX130B QAM & VSB RF Signal Generator Service Manual

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.

Only qualified personnel should perform service procedures.

To Avoid Fire or

Personal Injury

Use Proper Power Cord. Use only the power cord specified for this product and

certified for the country of use.

Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.

Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.

Use Proper Fuse. Use only the fuse type and rating specified for this product.

Avoid Exposed Circuitry. Do not touch exposed connections and components

when power is present.

Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in an Explosive Atmosphere.

Keep Product Surfaces Clean and Dry.

Provide Proper Ventilation. Refer to the manual’s installation instructions for

details on installing the product so it has proper ventilation.

RTX130B QAM & VSB RF Signal Generator Service Manual

vii

General Safety Summary

Symbols and Terms

Terms in this Manual. These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in

damage to this product or other property.

Terms on the Product. These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the
marking.

WARNING indicates an injury hazard not immediately accessible as you read the
marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product. The following symbols may appear on the product:

CAUTION

Refer to Manual

WARNING

High Voltage

Protective Ground

(Earth) Terminal

viii

RTX130B QAM & VSB RF Signal Generator Service Manual

Service Safety Summary

Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service

procedures.

Do Not Service Alone. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.

Disconnect Power. To avoid electric shock, disconnect the mains power by means
of the power cord or, if provided, the power switch.

Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.

To avoid electric shock, do not touch exposed connections.

RTX130B QAM & VSB RF Signal Generator Service Manual

ix

Service Safety Summary

x

RTX130B QAM & VSB RF Signal Generator Service Manual

Environmental Considerations

This section provides information about the environmental impact of the
product.

Product End-of-Life

Handling

Observe the following guidelines when recycling an instrument or component:

Equipment Recycling. Production of this equipment required the extraction and
use of natural resources. The equipment may contain substances that could be
harmful t o the environment or human health if improperly handled at the
product’s end of life. In order to avoid release of such substances into the
environment and to reduce the use of natural resources, we encourage you to
recycle this product in an appropriate system that will ensure that most of the
materials are reused or recycled appropriately.

The symbol shown to the left indicates that this product
complies with the European Union’s requirements
according to Directive 2002/96/EC on waste electrical and
electronic equipment (WEEE). For information about
recycling options, check the Support/Service section of t he
Tektronix Web site (www.tektronix.com).

Mercury Nortification. This product uses an LCD backlight lamp that contains
mercury. Disposal may be regulated due to environmental considerations. Please
contact your local authorities or, within the United States, the Electronics
Industries Alliance (www.eiae.org) for disposal or recycling information.

Restriction of Haz ardous

Substances

RTX130B QAM & VSB RF Signal Generator Service Manual

This product has been classified as Monitoring and Control equipment, and is
outside the scope of the 2002/95/EC RoHS Directive. This product is known to
contain lead, cadmium, mercury, and hexavalent chromium.

xi

Environmental C onsiderations

xii

RTX130B QAM & VSB RF Signal Generator Service Manual

Preface

Manual Structure

This is the service manual for the RTX130B QAM & VSB RF Signal Generator.
This manual contains information needed to service an RTX130B to the module
level.

This manual is divided into sections, such as Specifications and Theory of

Operation. Furthermore, some sections are divided into subsections, such as
Product Description and Removal and Installation Procedures.

Sections containing procedures also contain introductions to those procedures.
Be sure to read these introductions because they provide information needed to
do the service correctly and efficiently. The following are brief descriptions of
each manual section.

H Specifications contains a description of the RTX130B and the characteristics

that apply to it.

H Theory of Operation contains circuit descriptions that support service to the

module level.

H Performance Verification contains procedures for confirming that an

RTX130B functions properly and meets warranted characteristics.

H Maintenance contains information and procedures for performing preventive

and corrective maintenance of an RTX130B. These instructions include
cleaning, module removal and installation, and fault isolation to the module
level.

H Options contains descriptions of factory-installed options and field-upgrad-

able options.

H Diagrams contains the block diagram and interconnection diagram.

H Replaceable Parts List includes a table of all re placeable modules, their

descriptions, and their Tektronix part numbers.

RTX130B QAM & VSB RF Signal Generator Service Manual

xiii

Preface

Manual Conventions

This manual uses certain conventions with which you should become familiar.

Some sections of the manual contain procedures for you to perform. To keep
those instructions clear and consistent, t his manual uses the following
conventions:

H Names of front panel controls and menus appear in the same case (initial

capitals, all uppercase, and so forth) in the manual as is used on the
RTX130B front panel and menus.

H Instruction steps are numbered unless t here is only one step.

H Bold text refers to specific interface elements that you are instructed to

select, click, or clear.

Example: Press the Menu button to open the File menu.

H Italic text refers to document names or sections. Italics are also used in

NOTES, CAUTIONS, and W A RNINGS.

Modules

Safety

Throughout this manual, any replaceable component, assembly, or part of the
RTX130B is referred to generically as a module. In general, a module is an
assembly (like a circuit board), rather than a component (like a resistor or an
integrated circuit). Sometimes a single component is a m odule. For example, the
chassis of the RTX130B is a module.

Symbols and terms related to safety appear in the General Safety Summary and
Service Safety Summary near the beginning of this manual.

Finding Other Information

Other documentation for the RTX130B includes:

H The RTX130B QAM & VSB RF Signal Generator User Manual (Tektronix

Example: The Diagrams section, beginning on page 6-1, includes a block
diagram and an interconnect diagram.

part number 071-1933-00) contains a tutorial to quickly describe how to
operate the RTX130B. It also includes an in-depth discussion on how to use
the RTX130B features.

xiv

RTX130B QAM & VSB RF Signal Generator Service Manual

Introduction

This manual contains information needed to properly service the RTX130B
QAM & VSB RF Signal Generator, as well as general information critical to safe
and effective servicing.

To prevent personal injury or damage to the RTX130B, consider the following
before attempting service:

H The procedures in this manual should be performed only by a qualified

service person.

H Read the General Safety Summary and the Service Safety Summary,

beginning on page vii.

When using this manual for servicing, be sure to follow all warnings, cautions,
and notes.

Performance Check Interval

Generally, the performance check described in Section 3, Performance Verifica­tion, should be done every 12 months. In addition, a performance check is

recommended after module replacement.

Strategy for Servicing

If the RTX130B does not meet performance criteria, repair is necessary.

This manual contains all the information needed for periodic maintenance of the
RTX130B.

This manual also contains all information for corrective maintenance down to the
module level. To isolate a failure to a module, use the fault isolation procedures
found in Troubleshooting, part of Section 4, Maintenance. To remove and
replace any failed module, follow the instructions in Removal and Installation
Procedures, also part of Section 4. After isolating a faulty module, replace it
with a fully-tested module obtained from the factory. Section 7, Replaceable
Parts List, contains part number and ordering information for all replaceable
modules.

RTX130B QAM & VSB RF Signal Generator Service Manual

xv

Introduction

Tektronix Service Offerings

Tektronix provides service to cover repair under warranty as well as other
services that may provide a cost-effective answer to your service needs.

Whether providing warranty repair service or any of the other services listed
below, Tektronix service technicians are well trained to s ervice the RTX130B.
They have access to the latest information on improvements to the RTX130B as
well as the latest new options.

Warranty Repair Service

Self Service

Tektronix warrants this product for one year from date of purchase. The warranty
appears after the title page in this manual. Tektronix technicians provide
warranty service at most Tektronix service locations. The Tektronix product
catalog lists all worldwide service locations or you can visit our Web site for
service information: www.tektronix.com.

Tektronix supports repair to the module level by providing Module Exchange.

Module Exchange. This service reduces down-time for repair by allowing you to
exchange most modules for remanufactured ones. Each module comes with a
90-day service warranty.

For More Information. Contact your local Tektronix service center or sales
engineer for more information on any of these repair or adjustment services.

xvi

RTX130B QAM & VSB RF Signal Generator Service Manual

Specifications

Product Overview

The RTX130B QAM & VSB RF Signal Generator generates QAM and 8VSB
modulated signals that are compliant with the DVB-C/ITU-T J.83 Annex A/B/C
and ATSC standards. In addition to the RF signal output feature, the RTX130B
records and plays MPEG-2 transport streams that are compliant with ATSC,
DVB, and ARIB standards.

The RTX130B provides the following features:

H 16/64/256QAM and 8VSB modulation formats

H Modulation frequency range: 50 MHz to 860 MHz

H 44 MHz or 36 MHz IF output

H Support the following standards:

H DVB-C/ITU-T J.83 Annex A (Option M1)

H ITU-TJ.83AnnexB(OptionM2)

H ITU-TJ.83AnnexC(OptionM3)

H ATSC (Option M4)

H Data rate: 200 Mbps maximum (RAM mode); 256 Kbps minimum

H Hierarchy display of stored or captured transport streams

H 188, 204, 208 bytes packet size, S-TMCC, M-TMCC, non transport stream,

and partial transport stream output formats

H Real-time updating of stream parameters; continuity_counter, PCR/PTS/

DTS, TOT/TDT/STT, NPT, and Reed Solomon (ISDB-T only)

H Continuous recording of captured streams

H PCR jitter insertion

H Triggered stream capture

H Full remote control using Ethernet interface

H Scheduler application for automated stream playout and record (Option SC

only)

The RTX130B includes the R eMux application software that provides the
capability to create a transport stream of super frame structure defined in the
ISDB-S systems from an MPEG2 transport stream.

RTX130B QAM & VSB RF Signal Generator Service Manual

1-1

Product Overview

1-2

RTX130B QAM & VSB RF Signal Generator Service Manual

Specifications

Tables 1-1 through 1-4 list the functional, electrical, mechanical, and environ­mental characteristics of the RTX130B. Table 1-5 lists the national and
international standards to which the RTX130B complies.

All listed specifications are guaranteed unless labeled “typical”. Typical
specifications are provided for your convenience but are not guaranteed.

Performance Conditions

The electrical characteristics listed on the following pages are valid under the
following conditions:

H The RTX130B must be in an environment where the temperature, altitude,

H The RTX130B must have a warm-up period of at least 20 minutes.

H The RTX130B must be operating at an ambient temperature between

humidity, and vibration conditions are within the operating limits described
in Table 1-4 on page 1-12.

+5 _Cto+40_C, unless otherwise noted.

Functional Specifications

Table 1-1: Functional specifications

Characteristics Description

System configuration

System OS Windows XP Professional

CPU 1.3 GHz

System memory 1GB

Display 6.3 inch, XGA (1024 x 768), Windows Control Panel setting is SVGA (800 x 600)

Hard disk drive 160 GB

Expansion slot 1-PCIslot

RTX130B QAM & VSB RF Signal Generator Service Manual

1-3

Specifications

Electrical Specifications

Table 1-2: Mainframe

Characteristics Description

Maximum output rate

Hard disk

RAM

Maximum record rate

Hard disk

RAM

Internal reference clock For Output_clock, PCR/PTS/DTS, packet operation timing, and TDT/STT time.

Reference clock (on shipping) 27 MHz ± 1 ppm

Reference clock stability, typical ± 1 ppm/year

External reference/clock input

Connector type BNC

Input impedance, typical 50 Ω

Reference input

Frequency 8.129698 MHz, 10 MHz, and 27 MHz

Input level, typical Sine wave: 0 ± 6dBm

Clock input

Frequency 160 kHz to 25 MHz (parallel clock)

Input level, typical 0.5 V to 3.0 V

External trigger input/MISC output

Connector type BNC

Input impedance, typical 1kΩ

Threshold level Rising and falling edges are programmable.

High level

Low level

Output level

High level

Low level

Output impedance 50 Ω

≥120 Mbps

≥200 Mbps

≥120 Mbps (File size: < 4 GB, just after disk format operation)
≥90 Mbps (File size: 33 GB, just after disk format operation)

≥200 Mbps

± 1 ppm (5 _Cto40_C)

Square wave: 0.5 Vp-p to 3.0 Vp-p

1.28 MHz to 32 MHz (serial clock)

>3.5 V (maximum input voltage: 7 V)

<0.8 V

>2.2V(with50Ω termination)

<0.8V(with50Ω termination)

1-4

RTX130B QAM & VSB RF Signal Generator Service Manual

Table 1-2: Mainframe (Cont.)

Characteristics Description

PLL

Frequency 50 MHz to 100 MHz, locked to reference clock

Output clock 50 MHz maximum (serial clock)

26.75 MHz maximum (parallel clock)

Output rate 214 Mbps maximum

64 Kbps minimum

TS clock

TS clock = (X / (2 * Y * Z) ) * 27 MHz

Specifications

(Internal and external
reference, 27 MHz and 10 MHz)

(External parallel clock) TS clock = (X / (2 * Y * Z) ) * external parallel clock, 214 MHz maximum

(External serial clock) TS clock = (X / (2 * Y * Z) ) * external serial clock / 8,32 MHz maximum

P/N and Jitter (serial clock)

SPI interface

Connector type D-sub, 25 pin

Data rate 256 Kbps to 214 Mbps

Pin assignments 1 DCLK

15362 < X < 31248
1686 < Y < 3376
2 ≤ Z ≤ 65536

15632 < X < 31248
1 < Y < 16383
2 ≤ Z ≤ 65536

15632 < X < 31248
1 < Y < 16383
2 ≤ Z ≤ 65536

< --104 dBc/Hz at 21.455707 MHz +20 kHz (RBW=300 Hz)

2GND
3to10 DATA7toDATA0
11 DVALID
12 PSYNC
13 Shield
14 DCLK
15 GND
16 to 23 DATA 7
24 DVALID
25 PSYNC

to DATA 0

RTX130B QAM & VSB RF Signal Generator Service Manual

1-5

Specifications

Table 1-2: Mainframe (Cont.)

Characteristics Description

Output

Output level, typical 330 mV to 550 mV (termination: internal 100 Ω, external 100 Ω), bus LVDS with 50 Ω

termination

Offset 1.1 V to 1.5 V

Output resistance, typical 100 Ω, between differential outputs (output off)

Data delay , typical ± 5 ns from the falling edge of DCLK (see Figure 1-1 on page 1-11)

Input

Input level, typical

Input resistance, typical 100 Ω (between differential inputs)

Clock pulse width, typical T/2 ± T/10, T=1/f (f=byte clock frequency) (see Figure 1-1 on page 1-11)

Data hold time, typical T/2 ± T/10, T=1/f (f=byte clock frequency, data are latched on DCLK rising edge)

ASI/SMPTE310M interface

Connector type BNC

Impedance 75 Ω

Data rate 256 Kbps to 214 Mbps (ASI), 19.3 Mbps (SMPTE310M)

Output

Output voltage 800 mV ± 10%

Jitter (ASI)

Jitter (SMPTE310M)

Rise/fall time

Return loss

Input

Input voltage, typical 200 mV to 880 mV

Return loss

Data format Accepts both byte and packet modes.

> +100 mV, < --100 mV, (RI+)--(RI--) with 100 Ω termination

(see Figure 1-1 on page 1-11)

≤ 0.2 UI p--p

Past 1stedge < 1.4 ns

nd

Past 2
Prev 1

edge < 2ns

st

edge < 1.4 ns

ASI: ≤ 1.2 ns (20% to 80%)
SMPTE310M: 0.4 ns ≤ X ≤ 5 ns (20% to 80%)

ASI: < --17 dB (5 MHz to 270 MHz) into 75 Ω load
SMPTE310M: < --30 dB (5 MHz to 38.7 MHz) into 75 Ω load

ASI: < --17 dB (5 MHz to 270 MHz) into 75 Ω load
SMPTE310M: < --17 dB (5 MHz to 38.785316 MHz) into 75 Ω load

1-6

RTX130B QAM & VSB RF Signal Generator Service Manual

Table 1-2: Mainframe (Cont.)

Characteristics Description

RF/IF output

Connector type BNC

Output impedance, typical 75 Ω

Digital modulation standard

DVB-T/ITU-T J8.3 Annex A (Option M1)
The following parameters conform to the standard:

Symbol rate: 1 Msps to 6.9565 Msps (IF output)

Modulation: 16/64/256QAM
Outer cording: RS (204, 188)
Roll off: 0.15

ITU-T J.83 Annex B (Option M2)
The following parameters conform to the standard:

Symbol rate: 5.056941/5.360537 Msps
Modulation: 64/256QAM
Outer cording: RS (128, 122)
Roll off: 0.18/0.12
Interleaving: Level 1 (64 QAM only)

Specifications

5 Msps to 6.9565 Msps (RF output)

I=128, J=1

Level 2

I=128, J=1 (Control Word: 0001)
I=64, J=2 (0011)
I=32, J=4 (0101)
I=16, J=8 (0111)
I=8, J=16 (1001)
I=128, J=1 (0000)
I=128, J=2 (0010)
I=128, J=3 (0100)
I=128, J=4 (0110)
I=128, J=5 (1000)
I=128, J=6 (1010)
I=128, J=7 (1100)
I=128, J=8 (1110)

ITU-T J.83 Annex C (Option M3)
The following parameters conform to the standard:

Symbol rate: 1 Msps to 5.3097 Msps (IF output)

5 Msps to 5.3097 Msps (RF output)
Modulation: 64QAM
Outer cording: RS (204, 188)
Roll off: 0.13

ITU-T J.83 Annex C-JCTEA
The following parameters conform to the standard:

Symbol rate: 5.274 Msps
Modulation: 64QAM
Outer cording: RS (204, 188)
Roll off: 0.13

RTX130B QAM & VSB RF Signal Generator Service Manual

1-7

Specifications

Table 1-2: Mainframe (Cont.)

Characteristics Description

ATSC (Option M4)
The following parameters conform to the standard:

Symbol rate: 10.762238 Msps
Modulation: 8VSB
Outer cording: RS (187, 207)
Roll off: 0.1152

RF output

Frequency 50 MHz to 860 MHz (setting resolution: 12.5 kHz steps)

Output amplitude, typical 45 dBmV to 58 dBmV (setting resolution: 1 dB steps)

EVM (ITU-T J.83 Annex A) 256QAM

< 2.5% (RMS), 50 MHz to 750 MHz @ 45 dBmV to 52 dBmV
< 3.1% (RMS), 50 MHz to 860 MHz @ > 52 dBmV

64QAM

< 2.7% (RMS), 50 MHz to 750 MHz @ 45 dBmV to 52 dBmV
< 3.3% (RMS), 50 MHz to 860 MHz @ > 52 dBmV

16QAM

< 3.0% (RMS), 50 MHz to 750 MHz @ 45 dBmV to 52 dBmV
< 3.8% (RMS), 50 MHz to 860 MHz @ > 52 dBmV

EVM (ITU-T J.83 Annex B) 256QAM

< 2.5% (RMS), 50 MHz to 750 MHz @ 45 dBmV to 52 dBmV
< 3.1% (RMS), 50 MHz to 860 MHz @ > 52 dBmV

64QAM

< 2.7% (RMS), 50 MHz to 750 MHz @ 45 dBmV to 52 dBmV
< 3.3% (RMS), 50 MHz to 860 MHz @ > 52 dBmV

EVM (ITU-T J.83 Annex C
and Annex C for JCTEA)

SN (8VSB)

Return loss

IF output

Frequency 36 MHz, 44 MHz

Output amplitude 35 dBmV

EVM (ITU-T J.83 Annex A)

EVM (ITU-T J.83 Annex B)

64QAM

< 2.7% (RMS), 50 MHz to 750 MHz @ 45 dBmV to 52 dBmV
< 3.3% (RMS), 50 MHz to 860 MHz @ > 52 dBmV

> 27.0 dB, 190 MHz to 860 MHz @ 45 dBmV to 52 dB mV
> 25.0 dB, 190 MHz to 860 MHz @ > 52 dB mV
> 25.0 dB, < 190 MHz @ 45 dB mV to 58 dBmV

<--12 dB @ 50 MHz to 860 MHz

256QAM: <0.8% (RMS), 64QAM: <0.9% (RMS), 16QAM: <0.9% (RMS)
(symbol rate: ≥1 Msps, IF frequency: 36 MHz)

256QAM: <0.8% (RMS), 64QAM: <0.9% (RMS)
(IF frequency: 36 MHz)

1-8

RTX130B QAM & VSB RF Signal Generator Service Manual

Table 1-2: Mainframe (Cont.)

Characteristics Description

Specifications

EVM (ITU-T J.83 Annex C
and Annex C for JCTEA)

SN (8VSB)

Return loss

VGA output

Connector type D-sub, 15 pin

Pin assignments 1RED 9 NC

USB 2.0 interface

Number of connectors 2

Pin assignments 1VCC

LAN interface 10/100/1000 Base-T Ethernet interface

Connector type RJ45

Pin assignments 1 MDI_0+ 5 MDI_2--

64QAM: <0.9% (RMS)
(symbol rate: ≥1 Msps, IF frequency: 36 MHz)

> 34 dB
(IF frequency: 36 MHz)

< --20 dB @ 5 MHz to 44 MHz

2 GREEN 10 GND
3BLUE 11NC
4NC 12NC
5 GND 13 HSYNC
6 GND 14 VSYNC
7 GND 15 NC
8GND

2--DATA
3+DATA
4GND

2 MDI_0-- 6 MDI_1-­3 MDI_1+ 7 MDI_3+
4 MDI_2+ 8 MDI_3--

RTX130B QAM & VSB RF Signal Generator Service Manual

1-9

Specifications

Table 1-2: Mainframe (Cont.)

Characteristics Description

Printer port Supports SPP (Standard Parallel Port), EPP (Enhanced Parallel Port ), and ECP (Extended

Capabilities Port) modes.

Connector type D-sub, 25 pin

Pin assignments 1 STROBE 14 AUTOLF

2D0 15ERR
3D1 16INIT
4 D2 17 SELECT
5D3 18GND
6D4 19GND
7D5 20GND
8D6 21GND
9D7 22GND
10 ACK 23 GND
11 BUSY 24 GND
12 Paper Empty 25 GND
13 SELECT

Serial interface (Com) RS-232C

Connector type D-sub, 9 pin

Pin assignments 1 DCD 6 DSR

2RX 7 RTS
3TX 8 CTS
4DTR 9 RI
5GND

IEEE1394B interface

Compliant IEEE1394B--2002

Pin assignments 1TPB-- 6 VG

2 TPB+ 7 NC
3TPA-- 8 VP
4TPA+ 9 TPB(R)
5TPA(R)

AC line power

Rating Voltage 100 VAC to 240 VAC, CAT II

Voltage Range 90 VAC to 250 VAC

Frequency Range 50 Hz to 60 Hz

Maximum power 180 VA

Maximum current 1.3 A

Main fuse data 5 A Time--delayed, 250 V (not operator replaceable)

2 A Time--delayed, 250 V (not operator replaceable)

1-10

RTX130B QAM & VSB RF Signal Generator Service Manual

DATA 0--7

DCLK

PSYNC

Specifications

DVALID

DATA 0--7

DCLK*

DATA 0--7

188 bytes

5ns 5ns

Output data delay

T/2  T/10

T (1/f)

Transition period

T/2  T/10

Input clock pulse width

DCLK*

Input data hold time

Figure 1-1: Timing diagram of the SPI interface

RTX130B QAM & VSB RF Signal Generator Service Manual

1-11

Specifications

Mechanical (Physical) Characteristics

Table 1-3: Mechanical characteristics

Characteristics Description

Net weight

Standard Approximately 6 kg (13.2 lb)

Dimensions

Height 132 mm (5.2 in), without feet

Width 214 mm (8.4 in)

Length 435 mm (17.1 in)

Environmental Characteristics

Table 1-4: Environmental characteristics

Characteristics Description

Temperature

Operating +5 _Cto+40_C

Non-operating -- 2 0 _Cto+60_C

Relative humidity

Operating 20% to 80% (No condensation)

Maximum wet-bulb temperature 29 _C

Non-operating 5% to 90% (No condensation)

Maximum wet-bulb temperature 29 _C

Altitude

Operating Up to 3 km (approximately 10,000 feet)

Maximum operating temperature decreases 1 _C each 300 m above 1.5 km

Non-operating Up to 15 km (approximately 50,000 feet)

Dynamics

Vibration

Operating 2.65 m/s2rms (0.27 Grms), 5 Hz to 500 Hz, 10 min, three axes

Non-operating 22.3 m/s2rms (2.28 Grms), 5 Hz to 500 Hz, 10 min, three axes

Shock

Non-operating 294 m/s2(30 G), half-sine, 11 ms duration

Installation requirements

Power dissipation 100 W maximum. Maximum line current is 1.3 A

rms

at 50 Hz

1-12

RTX130B QAM & VSB RF Signal Generator Service Manual

Table 1-4: Environmental characteristics (Cont.)

Characteristics Description

Specifications

Surge current

Cooling clearance

Top clearance 5 cm (2 in)

Side clearance 5cm(2in)

Rear clearance 5cm(2in)

≦ 12 A peak for less than 5 line cycles at 25 _C after product has been off for at least 30
seconds

Certifications and Compliances

Table 1-5: Certifications and compliances

Category Standards or description

EC Declaration of Conformity Meets the intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance was

demonstrated to the following specifications as listed in the Official Journal of the European
Communities:

EMC Directive 89/336/EEC:

EN 55011 EMC requirement for Class A electrical equipment for

measurement, control and laboratory use

Australia/New Zealand Declaration
of Conformity -- EMC

EN 61000-3-2 AC Power Line Harmonic Emissions

IEC 61000-4-2 Electrostatic Discharge Immunity (Performance Criterion B)

IEC 61000-4-3 RF Electromagnetic Field Immunity (Performance Criterion A)

IEC 61000-4-4 Electrical Fast Transient / Burst Immunity (Performance Criterion B)

IEC 61000-4-5 Power Line Surge Immunity (Performance Criterion B)

IEC 61000-4-6 Conducted RF Immunity (Performance Criterion A)

IEC 61000-4-11 Voltage Dips and Interruptions Immunity (Performance Criterion B)

Low Voltage Directive 73/23/EEC: Amended by 93/68/EEC:

EN 61010-1: 2001 Safety Requirements for Electrical Equipment for Measurement,

Control, and Laboratory Use

Complies with EMC provision of Radio Communications Act per the following standard(s):

AS/NZS 2064.1/2 Industrial, Scientific, and Medical Equipment: 1992

RTX130B QAM & VSB RF Signal Generator Service Manual

1-13

Specifications

Table 1-5: Certifications and compliances (Cont.)

Category Standards or description

Safety Complies with the following safety standards/regulations:

UL 61010-1 Standard for Electrical Measuring and Test Equipment.

CAN/CSA C22.2 No.61010-1-04 Safety Requirements for Electrical Equipment for

Measurement, Control, and Laboratory Use.

EN 61010-1:2001 Safety Requirements for Electrical Equipment for

Measurement, Control, and Laboratory Use.

Installation (Overvoltage) Category T erminals on this product may have different installation (overvoltage) category designations. The

installation categories are:

CAT III Distribution-level mains (usually permanently connected). Equipment at this level is

typically in a fixed industrial location.

CAT II Local-level mains (wall sockets). Equipment at this level includes appliances,

portable tools, and similar products. Equipment is usually cord-connected.

CAT I Secondary (signal level) or battery operated circuits of electronic equipment.

Overvoltage Category Overvoltage Category II (as defined in IEC 61010-1)

Pollution Degree A measure of the contaminates that could occur in the environment around and within a product.

Typically the internal environment inside a product is considered to be the same as the external.
Products should be used only in the environment for which they are rated.

Pollution Degree 1 No pollution or only dry, nonconductive pollution occurs. Products in this

category are generally encapsulated, hermetically sealed, or located in
clean rooms.

Pollution Degree 2

Pollution Degree 2

Pollution Degree

IEC Characteristics Equipment type:

Pullution Degree 2 (as defined in IEC 61010-1). Note: Rated for indoor use only.

Normally only dry, nonconductive pollution occurs. Occasionally a
temporary conductivity that is caused by condensation must be expected.
This location is a typical office/home environment. Temporary
condensation occurs only when the product is out of service.

Conductive pollution, or dry, nonconductive pollution that becomes
conductive due to condensation. These are sheltered locations where
neither temperature nor humidity is controlled. The area is protected from
direct sunshine, rain, or direct wind.

1-14

Test and Measuring
Installation Category II (as defined in IEC 61010-1, Annex J)
Pollution Degree 2 (as defined in IEC 61010-1)
Safety Class I -- grounded product

RTX130B QAM & VSB RF Signal Generator Service Manual

Theory of Operation

Theory of Operation

This section describes the basic operation of the major circuit blocks or modules
in the RTX130B. The Diagrams section, beginning on page 6-1, includes a block
diagram and an interconnect diagram.

A12 Main Board

The A12 Main board consists of the following blocks:

PCI Interface

Mega FIFO

TS Controller

The PCI interface consists of a PCI target and a PCI master. The PCI target has
three base address register areas. The PCI master has two DMA controllers used
to transfer data from the A12 Main board to the system memory or from the
system memory to the A12 Main board.

The Mega FIFO has 32 MB for playing and 32 MB for recording a stream data.
It consists of two 256 megabit synchronous DRAM and FPGA. This FIFO is
used to compensate for non-realtime operation of Windows XP.

The TS controller consists of the following blocks:

TS Packet Type Controller. This controller sets a packet size of 188, 204, 208, and
Non TS (free length) as a TS packet type. For a Non TS format, the controller
also sets a packet length (16-255) and data length (16-255). The data length
shows an effective data length in one TS packet.

Data Valid Controller. This block generates a data valid signal that synchronizes
with the first byte of a TS packet when stream output is started.

Psync Controller. Psync is a signal to identify the sync byte i n a transport stream.
When the controller is not in the Psync Regeneration mode, Psync is recognized
as the first byte of a transport stream. In this case, Psync is output in the constant
interval even when the sync byte is rewritten in the value except for 47h. For the
Super Frame mode, Psync is output only once in 384 packets.

Psync Regenerator. This block becomes active when the P sync Regeneration
mode is set. The block detects the sync byte (47h) in a data stream and regener­ates a Psync signal. The psync generator supports 188, 204, 208 TS packets only.

RTX130B QAM & VSB RF Signal Generator Service Manual

2-1

Theory of Operation

PCR/DTS Updater. This block consists of a PCR counter and update logic. The
PCR counter is a complex counter, which consists of a 9-bit counter (range
0-299) and 33-bit counter. The counter counts the 27 MHz standard frequency.
The update logic replaces the PCR and PTS/DTS values in a transport stream
with the sum of the original value and the PCR counter value.

Receive Rate Counter. This 24-bit counter is used for receive-rate calculation on
recording process. When using a data valid signal (DVALID), the counter counts
byte data rate. When not using DVALID, the counter counts receive clock.

Transmit Byte Counter. This 32-bit counter counts transmitted bytes. This counter
can be read by the control software.

Interrupt Controller

TS Clock Generator

Reference Clocks

The interrupt controller sends the following interruption signals to the CPU: Play
FIFO empty, Record FIFO full, external trigger, 10 Hz, Playout DMA transfer
finished, and Record DMA transfer finished. These interruptions can be disabled
by the RTX130B application software. At power on, all interruptions are
disabled.

The TS clock generator consists of a VCO (Voltage Control Oscillator), phase
detector, frequency divider. The VCO is used for generating a TS clock, and it
covers frequencies of 400 MHz to 800 MHz. The frequency divider divides the
clock by 65536 to 1.

The reference clocks consist of 27 MHz TCXO and half-divided output of
54 MHz clock generator. These clocks are used to compare the frequency of the
TS Clock Generator.

2-2

RTX130B QAM & VSB RF Signal Generator Service Manual

A20 PCI Backplane Board

The A20 PCI Backplane board consists of the following connectors and
circuitries:

Theory of Operation

PCI and ISA Connectors

ATX Power Control C ircuit

Interconnect Circuit

The J100, J110, and J120 connectors are PCI slots for 5 V. The J130 connector is
a PCI slot for 3.3 V and is reserved in the future. The J100 connector is the
system slot and is used to install the CPU board (single board computer: SBC).
The J110 and J120 connectors are used to install the A12 Main board and the
A180 QAM Modulator board.

The PWR_Button line (Pins 9 and 10 of J310) of the SBC is connected to the
power switch on the Keypad board through the Front-Panel Processor board.
When the power switch is pressed, the SBC causes the PSON# signal to go low.
When the PSON# signal becomes low, Q10 turns on and +12 V main power is
also on. When the power switch is pressed again, its status is sent to BIOS and
the PSON# signal turns high. This circuit includes a +12 V to +5 V DC-DC
converter, a +12 V to +3.3 V converter, and a +12 V to --12 V converter.

There are four connectors in the interconnect circuit: J230, J240, J290, and J310.
J230 is used to connect the board to the LCD interface on the CPU board. J290
is used to connect the board to COM2 on the CPU board. J310 is used to connect
the board to the hard disk drive LED and reset/power button on t he CPU board.
J240 is used to connect the board to the Front-Panel P rocessor board. This circuit
also has an RS-232C level converter.

Fan Speed Control Circuit

IEEE1394b Interface

RTX130B QAM & VSB RF Signal Generator Service Manual

U700 (PIC Micro) controls the internal fan revolution. It gets the temperature
data from the sensors (U720 and U730) through 12C BUS and controls the
supply voltage to the fan (7 V to 11.5 V).

The IEEE1394 interface consists of the 1394b link-layer device (U110), cable
transcriver/arbiter (U120), oscillator (Y100), serial EEPROM (U140), regulators
(U130 and U230), and IEEE1394b connector (J140).

2-3

Theory of Operation

A180 QAM Modulator Board

Figure 2-1 shows the block diagram of the A180 QAM Modulator board.

Figure 2-1: Block diagram of the A180 QAM Modulator board

PCI Interface

Digital Modulator

SRAM

2-4

U3 (PLX PCI9030) is a PCI target device. The application software controls the
A180 board via PCI 9030. An EEPROM (U4) is connected to PCI 9030 and it
contains the PCI configuration data for the A180 board.

U37 (Xilinx Spartan-3 XC3S1500-4) is a re-configurable device that is config­ured via the PCI bus. The application software configures the device as an ITU-T
J.83 Annex A, B, C/C-JCTEA, or ATSC 8 VSB modulator.

U13 is a 128 K by 36 bit synchronous-pipelined burst SRAM. The J.83 Annex B
modulator uses the SRAM for interleave storage, but other modulators do not
use it.

RTX130B QAM & VSB RF Signal Generator Service Manual

Theory of Operation

Local Bus Interface

Base Clock Generator and

Symbol Clock Generator

Switching Regulator

Linear Voltage Regulator

Cable Equalizer and ASI

Receiver

SMPTE310M Receiver

The Local Bus interface consists of U5, U6, U7, and U8. U5 is a local bus data
driver/receiver, U6 is a control signal driver/receiver, U7 is an LVDS receiver,
andU8isanLVDSdriver.

U11 (symbol clock generator) and U12 (base clock generator) are programmable
clock generators. The application software can program these clock generators
via I2C interface in the digital modulator.

U35 is a switching regulator for the internal supply voltage of the digital
modulator. It converts +3.3 V to +1.2 V.

U36 is a linear voltage regulator for the auxiliary supply voltage of the digital
modulator. It converts +3.3 V to + 2.5 V.

U14 is a cable equalizer for an ASI/SMPTE310M signal. The ASI receiver
converts an 8B/10B signal to a parallel signal.

U15 is a programmable SMPTE receiver that can be reprogrammed via the J4
connector. There are an SMPTE310M decoder and PLL controller in U15.

ASI Transmitter

Output Selector

Cable Driver

SMPTE310M VCO Circuit

Quadrature Digital

Up-Converter and DAC

Low Pass Filter

U18 (CY7B9234) is an ASI transmitter. It converts parallel data to 8B/10B serial
data.

U20 (MC100EL57) is an output selector. It selects one of the four input status;
low level, loop-through signal, SMPTE310M signal and ASI output.

U21 (CLC007) is a cable driver. It can drive a 75 Ω coaxial cable.

M1 is a VCO for the SMPTE310M receiver. The frequency is controlled by an
SMPTE310M input signal.

U22 (AD9857) is a quadrature digital up-converter and DAC. It consists of
digital filters, quadrature modulator, DDS (direct digital synthesis), and 14-bit
DAC. The quadrature modulator converts I/Q data to real data. The 14-bit DAC
converts the digital output from the quadrature modulator to an analog signal.

The low pass filter is connected to the output of AD9857. It is a 7th order elliptic
filter and removes Nyquist images.

RTX130B QAM & VSB RF Signal Generator Service Manual

2-5

Theory of Operation

Buffer Driver and Cable

Driver

RF Up-Converter

Power Supply

U39 and U40 are buffer drivers (AD8131). U42 and U52 are the cable drivers
(AD8324). The cable driver is gain programmable over a range of 60 dB.

U44 (MT5100) is an RF up-converter. The converter has the output frequency
range of 50 MHz to 860 MHz and output level of 45 dBm to 58 dBm. The
output level is set using the cable drivers (described in the preceding paragraph).

The power supply consists of U38, U41 (LT1370), U43, U45 (LT1372), U47,
U49, and U50. U41 is a part of the +7 V switching power supply. U43 is a linear
voltage regulator that generates a +6 V from +7 V. The RF up-converter uses the
voltage. U 50 is a linear voltage regulator that generates +5 V from +7 V.
Maximum current of the +6 V regulator is +1.5 A and that of the +5 V regulator
is 0.5 A. U38 is a linear voltage regulator that converts +5 V to + 3.3 V. U45 is
a part of +14 V switching power supply. U47 is a linear voltage regulator that
generates + 12 V from + 14 V and it supplies + 12V to the SMPTE310M VCO.
U 49 is a negative regulator that generates --5 V from --12 V.

Front-Panel Processor Board

The Front-Panel Processor board consists of the following circuitries and
connectors:

Front-panel Keypad

Interface and LED Control

LVDS Data for LCD

Backlight Power Control

LCD Brightness Control

USB Ports

The state of the front-panel keys are read by the one chip processor on the board
and any setting changes are reported to the SBC through the COM2. The
processor also controls the LED on/off state of the front-panel LEDs.

The LVDS data from the SBC is routed through the board to the LCD.

When the Window OS puts the instrument into power saver mode, the LVDS
data from the SBC stops and the LCD backlight needs to be turned off or a
rainbow display will occur. When the LVDS data stops, the common mode
voltage of the data lines changes from the normal + 1.25 V to 0 V. The compara­tor U10 senses this voltage change and turns off the power MOSFET switch Q10
and the power to the backlight inverter board.

The potentiometer R301 could be used to dim the LCD backlight brightness. But
R302 is not installed, so the adjustment has no effect and the backlight is at
maximum brightness.

There are two USB connectors on the board that are connected through a cable to
the USB 2.0 interface connector on the CPU board.

2-6

RTX130B QAM & VSB RF Signal Generator Service Manual

Keypad Board

The Keypad board contains the switch patterns for the elastomer keys and the
front-panel LEDs. The board is connected to the Front-Panel Processor board by
the board-to-board connectors J10 and J11.

A40 AC Distributor Board

The A40 AC Distributor board supplies standby power (5VSB) to the SBC and
the ATX power control circuit on the A20 Backplane board.

Theory of Operation

RTX130B QAM & VSB RF Signal Generator Service Manual

2-7

Theory of Operation

2-8

RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

Performance Verification

This section provides procedures to verify the performance and functionality of
the RTX130B.

Equipment Required

Table 3-1 lists the test equipment required to perform all of the performance
verification procedures. The table identifies examples of recommended
equipment and lists the required precision where applicable. If you substitute
other test equipment for the examples listed, the equipment must meet or exceed
the listed tolerances.

Table 3-1: Equipment required for performance verification

Item Qty. Minimum requirements Recommended equipment

Frequency counter 1 ea. Frequency range: 27 MHz to 200 MHz

Precision: 8 digits or higher

MPEG analyzer 1 ea. Tektronix MTS430 or MTS400

Function generator 1 ea. Frequency: 40 M clock pattern

Amplitude: 3 V
Outputs: 2 channel

Oscilloscope 1 ea. Bandwidth: 1 GHz or higher Tektronix TDS5104B

MPEG transport stream monitor 1 ea. Tektronix MTM400 Option QA/QB2/QC/VS

PC 1 ea. Microsoft Internet Explorer (Version 5) and

Java Virtual Machine (Version 5) must be
installed

Probe 1 ea. Tektronix P5050

75 Ω signal adapter 1 ea. Bandwidth: 1 GHz

Amplitude precision: --3 dB

BNC(Fe)-to-F(Ma) adapter 1 ea. 75 Ω Tektronix part number 103-0158-00

20 dB attenuator 2 ea. 75 Ω Mini-Circuits HAT-20-75

50 Ω BNC cable 2 ea. Length: 42 inches Tektronix part number 012-0057-01

75 Ω BNC cable 1 ea. 5C-2V , 1 m Canare DH5C01-S-SA

Parallel interface cable 1 ea. 25-pin, D-type Tektronix part number 012-A220-00

IEEE1394b cable 1 ea. 9pin--9pin

Crossover Ethernet cable 1 ea.

Agilent Technologies 53181A

Tektronix AFG3102

Tektronix AMT75

(supplied with the RTX130B)

1

RTX130B QAM & VSB RF Signal Generator Service Manual

3-1

Performance Verification

Table 3-1: Equipment required for performance verification (Cont.)

Item Recommended equipmentMinimum requirementsQty.

IEEE1394b hard disk drive 1 ea. Novac NV-HD352WB and hard disk drive

(Tektronix part number 119-7146-00)

1

MTM400 option(s) required depends on the modulation option(s) installed in the instrument to be tested as follows:

RTX130B Option M1: Option QA
RTX130B Option M2: Option QB2
RTX130B Option M3: Option QC
RTX130B Option M4: Option VS

3-2

RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

RTX130B Test Record

Photocopy this page and use it to record the performance test result.

Table 3-2: RTX130B test record

Serial Number: Cal Date: Temperature: Humidity:

Performance Test Minimum Measured Maximum

Internal Clock Frequency 26.999973 MHZ MHz 27.000027 MHz

RTX130B QAM & VSB RF Signal Generator Service Manual

3-3

Performance Verification

Procedures

The following conventions are used in the performance verification procedures:

H Each test lists the characteristic that is being t ested and the equipment

required to perform the test.

H Each test contains complete setup instructions, which allows you to perform

each test individually or in order.

H The equipment connection illustrations are specific to the recommended

equipment (equipment nomenclature is labeled). If you are using substitute
equipment, the location of your signal connections may vary from those in
the illustrations.

NOTE. Before you begin the performance verification procedures, be sure that the

RTX130B is operating in an environment that is within the operating limits
described in Table 1-4 on page 1-12.

In addition, the RTX130B and the test equipment must be warmed up for at least
20 minutes to ensure accurate test results.

3-4

RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

q

p

Internal C lock Output

Level and Frequency

RTX130B rear panel

Accuracy

This test verifies the internal clock output level and frequency accuracy.

Equipment
required

Oscilloscope

Frequency counter

50 Ω BNC cable

1. Use the 50 Ω BNC cable to connect the Trig In/Out connector on the

RTX130B to the oscilloscope CH1 input. See Figure 3-1.

Oscilloscope (TDS5104B)

50 Ω BNC cable

Figure 3-1: Equipment connection for checking the internal clock output level

2. Select Play > Others on the RTX130B to open the Others dialog box.

3. In the dialog box, select the Ext Trigger BNC button to open t he Ext

Trigger BNC dialog box.

4. In the dialog box, set BNC IN/OUT to Output and BNC OUT Selection to
27MHz.

RTX130B QAM & VSB RF Signal Generator Service Manual

3-5

Performance Verification

5. Set t he oscilloscope as indicated below:

Vertical scale 1 V/div (CH1)........

Input impedance 50 Ω.....

Horizontal scale 10 ns/div.....

Trigger position 50%......

Acquire mode Average 16.......

Trigger mode Auto........

Trigger level 1.20 V........

Trigger source CH1.......

Trigger slope Rising Edge........

Input coupling DC.......

Measure High Level, Low level............

6. Verify that the measured values are as follows:

High Level: > 2.2 V
Low Level: < 0.8 V

7. Disconnect the 50 Ω BNC cable from the oscilloscope CH1 input, and then

connect the BNC cable to the CH1 connector on the frequency counter.
SeeFigure3-2.

RTX130B rear panel

Frequency counter (53181A)

50 Ω BNC cable

Figure 3-2: Equipment connection for checking the internal clock frequency

8. Set the frequency counter as indicated below:

MEASURE Frequency1.........

Gate Time: 0.20 s

CHANNEL1 Coupling: DC........

Impedance: 50
Trigger:AUTOTRIGON

9. Verify that the frequency counter reading falls within the range of

26.999973 MHz to 27.000027 MHz (< 1.0 ppm).

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RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

q

p

10. In the Ext Trigger BNC dialog box, change BNC IN/OUT to Input.

11. Disconnect the BNC cable from the RTX130B and frequency counter.

SPI Interface

RTX130B rear panel

This test verifies that transport stream data is correctly played from and recorded
through the SPI In/Out connector on the RTX130B.

Equipment
required

MPEG analyzer

Parallel interface cable

test40.TRP file

Checking the Play Operation.

1. Use t he parallel interface cable to connect the SPI In/Out connector on the
RTX130B to the DVB SPI In connector on the MPEG analyzer.
SeeFigure3-3.

MPEG analyzer rear panel (MTS430)

Parallel interface cable

Figure 3-3: Equipment connection for checking the play operation- SPI interface

2. Start the MPEG Player application on the MPEG analyzer.

3. Set the application to the Record mode.

RTX130B QAM & VSB RF Signal Generator Service Manual

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Performance Verification

4. Open the test40.TRP file on the RTX130B.

a. Select File > Open in the Play screen to open the Select File dialog box.

b. In the dialog box, select the test40.TRP file.

5. On the RTX130B, make the following settings:

Play menu

Data rate 214 Mbps....

Update Off......

Source RAM......

6. On the MPEG analyzer, make the following settings:

Record

Source SPI......

Target RAM, Size: 100 MB......

File

Save Mode Overwrite..

Save E:\MTXRTX_Test streams\Record_Files\........

SPI214Mbps

7. Press the Play/Pause button on the RTX130B to start playing the test40.TRP
file.

8. Verify that the hierarchic view is displayed on the MPEG analyzer screen. In
addition, verify that the bit rate is 214 Mbps and the packet size is

188 bytes.

9. Click the Record button on the MPEG Player application to record the file.

10. After recording is completed, press the Stop button on the RTX130B.

Checking the Record Operation.

11. Change the interface cable connection from DVB/SPI In connector to
DVB/SPI Out connector on the MPEG analyzer.

12. Press the Record button on the RTX130B to display t he Record screen.

13. On the RTX130B, m ake the following settings:

Record menu

Source SPI......

Target R AM......

Record Size 100 MB..

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RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

File menu

Save Mode Over Write..

Save D:\Record_Files\SPI214Mbps........

14. Change the MPEG analyzer to the Play mode.

15. Select File > Open on the MPEG analyzer to display the Open dialog box.

16. In the dialog box, navigate to the E:\MTXRTX_Test streams\
Record_Files, and then select the SPI214Mbp s .trp file.

17. On the MPEG analyzer, make the following settings:

Play menu

Data Rate 214 Mbps...

Update Off......

Source RAM......

18. Click the PLAY button on the MPEG Analyzer to start playing the
SPI214Mbps.trp file.

19. Verify that the hierarchic view is displayed on the RTX130B screen. In

addition, verify that the bit rate display is 214 Mbps and the packet size
display is 188 bytes.

20. Press the Record button on the RTX130B to record the file.

21. After recording is completed, click the Stop button on the MPEG analyzer.

22. Exit the MPEG Player application on the MPEG analyzer.

Checking the Recorded File.

23. Change the interface cable connection from DVB/SPI Out connector to
DVB/SPI In connector on the MPEG analyzer.

24. Start the TS Compliance Analyzer on the MPEG analyzer.

25. In the Open Transport Stream dialog box, select Real-time Analysis,and

then make the following settings:

Interfaces DVB Parallel...........

Interface Settings Time Stamping....

26. Click the OK button.

27. Press the Play/Pause button on the RTX130B to display the Play screen.

28. Select File > Open to open the Select File dialog box.

29. In the dialog box, navigate to the D:\ Record_Files directory, and then select

the SPI214Mbps.trp file.

RTX130B QAM & VSB RF Signal Generator Service Manual

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Performance Verification

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30. Select Play > Update > On on the RTX130B.

31. Press the Play/Pause button on the RTX130B to start playing the

SPI214Mbps.trp file.

32. Verify that the hierarchic view is displayed on the screen and that no error
messages appear. In addition, verify that the bit rate is 40 Mbps and that the
transport stream packet size is 188 bytes.

NOTE. Ignore Program 3 and PID 120 (0x78) errors in the hierarchical view

because these are caused by the original test40.TRP file.

33. Press the Stop button on the RTX130B.

34. Close the TS Compliance Analyzer window.

External Clock/Reference

and External Trigger

Inputs

This test confirms that the external clock/reference input (Clock/Ref In) and
external trigger input (Trig In/Out) on the RTX130B are functioning correctly.

Equipment
required

MPEG analyzer

Function generator

Two 50 Ω BNC cables

Parallel interface cable

test64.TRP file

1. Usea50Ω BNC cable to connect the Clock/Ref In connector on the
RTX130B to the Ch1 connector on the function generator. See Figure 3-4.

2. Use the 50 Ω BNC cable to connect the Trig In/Out connector on the
RTX130B to the Ch2 connector on the function generator. See Figure 3-4.

3. Use t he parallel interface cable to connect the SPI In/Out connector on the
RTX130B to the DVB/SPI In connector on the MPEG analyzer. See
Figure 3-4.

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RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

A

Function generator (

50 Ω BNC cable

RTX130B rear panel

FG3102)

MPEG analyzer (MTS430)

50 Ω BNC cable

Parallel interface cable

Figure 3-4: Equipment connections for checking the external clock/reference and trigger inputs

4. Set the function generator as indicated below:

Ch 1 output

Function Square...........

Run Mode Continuous..........

Frequency 10 MHz..........

Output Amplitude 0.5 V....

Output Offset 2.0 V.......

Ch 2 output

Function Arb (Edit: Point Number: 100,...........

All Data: 16382)

Run Mode Continuous..........

Output Menu Load Impedance: 1 kΩ........

Output Amplitude 1.75 V....

Output Offset 0.875 V.......

5. Press the On button of the Ch1 output on the function generator.

6. Open the test64.TRP file on the RTX130B.

a. Select File > Open in the Play screen to open the Select File dialog box.

b. In the dialog box, select the test64.TRP file.

RTX130B QAM & VSB RF Signal Generator Service Manual

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Performance Verification

7. Set Play > Update > On.

8. Select Play > Clock to open the Clock dialog box.

9. In the Clock dialog box, select ExtRef 10.

10. Press the Play/Pause button on the RTX130B to start playing the test64.TRP

file.

11. Verify that PLL unlock error does not occur on the RTX130B.

12. Start the TS Compliance Analyzer on the MPEG analyzer.

13. In the Open Transport Stream dialog box, select Real-time Analysis,and

then make the following settings:

Interfaces DVB Parallel...........

Interface Settings Time Stamping....

14. Click the OK button.

15. Verify that the hierarchic view is displayed on the MPEG analyzer screen

and that no error messages appear. In addition, verify that the bit rate is
64 Mbps and the packet size is 188 bytes.

NOTE. Ignore Program 3 and PID 120 (0x78) errors in the hierarchical view

because these are caused by the original test40.TRP file.

16. Change the clock source setting on the RTX130B and output frequency
setting on the function generator with the following and then repeat step 15.

Clock source setting (RTX130B) Output frequency setting (function generator)

ExtRef 27 27 MHz

Ext Ref 8.126984 MHz 8.126984 MHz

Ext P Clk 8MHz

17. Change the output frequency of the function generator to 32 MHz.

18. Select Play > Clock on the RTX130B to open the Clock dialog box.

19. In the dialog box, select Ext S Clk.

3-12

20. Repeat step 15 and verify that all items in the Priority 1 row are green.

NOTE. Ignore 2.3.a PCR Repetition and 2.5 PTS errors in the Priority 2 row.

RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

21. Press the Stop button on t he RTX130B to stop the stream output.

22. Select Play > Clock on the RTX130B to open the Clock dialog box.

23. In the dialog box, select Internal.

24. Press the On button of the Ch1 output on the function generator to stop the

signal output.

25. Press the On button of the Ch2 output on the function generator to start the
signal output.

26. Select Play > Others on the RTX130B to open the Others dialog box.

27. In the dialog box, set Ext Play Start to Rise.

28. Verify that the RTX130B starts playing when the Output menu is set to
Invert on the function generator.

29. Press the Stop button on t he RTX130B to stop the stream output.

30. Press the On button of the Ch2 output on the function generator to stop the

signal output.

31. Return Ext Play Start to Off on the RTX130B.

32. Disconnect all cables from the RTX130B, function generator, and MPEG

analyzer.

RTX130B QAM & VSB RF Signal Generator Service Manual

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ASI/SMPTE310M Interface

This test verifies that transport stream data is correctly played from and is
recorded through the ASI/SMP TE310M interface on the RTX130B.

Equipment
required

MPEG analyzer

Oscilloscope

75 Ω BNC cable

75 Ω signal adapter

test40.TRP file

Flower.trp file

Checking the Output Signal.

1. Use the 75 Ω BNC cable and the 75 Ω signal adapter to connect the

ASI/SMPTE Output connector on the RTX130B to the oscilloscope CH1
input. See Figure 3-5.

Oscilloscope (TDS5104B)

RTX130B rear panel

75 Ω BNC cable

Figure 3-5: Equipment connection for checking the output signal- ASI interface

75 Ω signal adapter

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RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

2. Set t he oscilloscope as indicated below:

Vertical scale 200 mV/div........

Input impedance 50 Ω.....

Horizontal scale 1.25 ns/div.....

Trigger position 50%......

Acquire mode Average 32.......

Trigger mode AUTO........

Trigger source CH1.......

Trigger level 0 V........

Trigger slope Rising Edge........

Input coupling DC.......

Measure Amplitude, Rise Time, Fall Time............

Ref Level High Ref 80%, Low Ref 20%..........

Gating Cursor Curs1 Pos1: --2.5 ns/Curs2: 2.75 ns.............

3. Open the test40.TRP file on the RTX130B.

a. Select File > Open in the Play screen to open the Select File dialog box.

b. In the dialog box, select the test40.TRP file.

4. Press the Play/Pause button to start playing the test40.TRP file.

5. Use the oscilloscope to measure that the amplitude, rise and fall times are as

follows:

Amplitude: 720 mV to 880 mV
Rise and fall time: ≤ 1.2 ns

RTX130B QAM & VSB RF Signal Generator Service Manual

3-15

Performance Verification

RTX130B rear panel

Checking the ASI Play Operation.

6. Disconnect the BNC cable from the 75 Ω signal adapter on the oscilloscope,

and then connect the cable to the ASI/SMPTE In connector on the MPEG
analyzer. See Figure 3-6.

MPEG analyzer rear panel (MTS430)

75 Ω BNC cable

Figure 3-6: Equipment connections for checking the ASI play operation

7. Start the MPEG Player application on the MPEG analyzer.

8. Set the application to the Record mode.

9. Set the MPEG analyzer as indicated below:

Record menu

Source SPI/ASI/310M......

Target RAM, Record Size: 100 MB......

SPI/ASI/310M menu

Input Port BNC...
BNC Port ASI...

File menu

Save Mode Over write..

Save E:\MTXRTX_Test streams\Record_Files\........

ASI214Mbps.trp

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RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

10. On the RTX130B, m ake the following settings:

Play menu

Clock Data Rate: 214 Mbps.......

Update Off......

Source RAM......

QAM/VSB menu

BNC Port ASI...
Through Out Off.

RF Out Off.....

11. Press the Play/Pause button on the RTX130B to start playing the
test40.TRP.

12. Verify that the hierarchic view is displayed on the MPEG analyzer screen.
In addition, verify that the bit rate is 214 Mbps and the packet size is

188 bytes.

13. Click the Record button on the MPEG Player application to record the file.

RTX130B rear panel

14. After recording is completed, press the Stop button on the RTX130B.

15. Disconnect the 75 Ω BNC cable from the RTX130B and MPEG analyzer.

Checking the ASI Record Operation.

16. Use the 75 Ω BNC cable to connect the ASI/SMPTE Input connector on the
RTX130B to the ASI/SMPTE Out connector on the MPEG analyzer.
SeeFigure3-7.

MPEG analyzer rear panel (MTS430)

75 Ω BNC cable

Figure 3-7: Equipment connection for checking the ASI record operation

RTX130B QAM & VSB RF Signal Generator Service Manual

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Performance Verification

17. Press the Record button on the RTX130B to display t he Record screen.

18. On the RTX130B, m ake the following settings:

Record menu

Source QAM/VSB.........

Record size 100 MB.....

Target RAM.........

QAM/VSB menu

BNC Port ASI......

File menu

Save Mode Over Write.....

Save D:\Record_Files\ASI214Mbps.trp...........

19. Set the MPEG analyzer to the Play mode.

20. Select File > Open on the MPEG analyzer to display the Open dialog box.

21. In the dialog box, navigate to the E:\MTXRTX_Test Streams\Re­cord_Files directory, and then select the ASI214Mbps.trp file.

22. On the MPEG player, make the following settings:

Play menu

Clock Data Rate: 214 Mbps..........

Update Off.........

Source RAM.........

SPI/ASI/310M menu

BNC Port ASI......

Through Out Off....

23. Click the PLAY button on the MPEG analyzer to start playing the
ASI214Mbps.trp file.

24. Verify that the hierarchic view is displayed on the RTX130B screen. In
addition, verify that the bit rate is 214 Mbps and packet size is 188 bytes.

25. Press the Record button on the RTX130B to record the file.

26. After recording is completed, click the Stop button on the MPEG analyzer.

27. Exit the MPEG Player application on the MPEG analyzer.

28. Disconnect the 75 Ω BNC cable from the RTX130B and MPEG analyzer.

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RTX130B QAM & VSB RF Signal Generator Service Manual

RTX130B rear panel

Performance Verification

Checking the Recorded File.

29. Use the 75 Ω BNC cable to connect the ASI/SMPTE Output connector on

the RTX130B to the ASI/SMPTE In connector on the MPEG analyzer.
SeeFigure3-8.

MPEG analyzer rear panel (MTS430)

75 Ω BNC cable

Figure 3-8: Equipment connection for checking the recorded file- ASI interface

30. Press the Play/Pause button on the RTX130B to display the Play screen.

31. Select Play > Update > On.

32. Open the ASI214Mbps file on the RTX130B.

a. Select File > Open to open the Select File dialog box.

b. In the dialog box, navigate to the D:\Record_Files directory, and then

select the ASI214Mbps.trp file.

33. Press the Play/Pause button to start playing the file.

34. Start the TS Compliance Analyzer on the MPEG analyzer.

35. In the Open Transport Stream dialog box, select Real-time Analysis,and

then make the following settings:

Interfaces ASI...........

Interface Settings Time Stamping....

36. Click the OK button.

RTX130B QAM & VSB RF Signal Generator Service Manual

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Performance Verification

37. Verify that the hierarchic view is displayed on the screen and that no error
messages appear. In addition, verify that the bit rate is 40 Mbps and that the
packet size is 188 bytes.

NOTE. Ignore Program 3 and PID 120 (0x78) errors in the hierarchical view

because these are caused by the original test40.TRP file.

38. Press the Stop button on t he RTX130B to stop the stream output.

39. Disconnect the 75 Ω BNC cable from the RTX130B and MPEG analyzer.

Checking the 8VSB Play Operation.

40. Use the 75 Ω BNC cable to connect the ASI/SMPTE Output connector on
the RTX130B to the ASI/SMPTE In connector on the MPEG analyzer.
SeeFigure3-9.

MPEG analyzer rear panel (MTS430)

RTX130B rear panel

75 Ω BNC cable

Figure 3-9: Equipment connection for verifying the 8VSB play operation

41. Start the MPEG Player application on the MPEG analyzer.

42. Set the application to the Record mode.

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RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

43. Set the MPEG analyzer as indicated bellow:

Record menu

Source SPI/ASI/310M.........

Target RAM, Record Size: 100 MB.........

SPI/ASI/310M menu

Input Port BNC......

BNC Port 310M......

File menu

Save Mode Over write.....

Save E:\MTXRTX_Test streams\Record_Files\...........

S310M.trp

44. Open the Flower.trp file on the RTX130B.

a. Select File > Open to open the Select File dialog box.

b. In the dialog box, navigate to the D:\525 directory, and then select the

Flower.trp file.

45. On the RTX130B, m ake the following settings:

Play menu

Clock Data Rate: 19. 392658 Mbps..........

Update Off.........

Source RAM.........

QAM/VSB menu

BNC Port 310M 8VSB......

Through Out Off....

RF Out Off........

46. Press the Play/Pause button on the RTX130B to start playing the Flower.trp
file.

47. Verify that the hierarchic view is displayed on the MPEG analyzer screen. In
addition, verify that the bit rate is 19.392 Mbps and packet size is 188 bytes.

48. Click the Record button on the MPEG Player application to record the file.

49. After recording is completed, press the Stop button on the RTX130B.

50. Disconnect the 75 Ω BNC cable from the RTX130B and MPEG analyzer.

RTX130B QAM & VSB RF Signal Generator Service Manual

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Performance Verification

RTX130B rear panel

Checking the 8VSB Record Operation.

51. Use the 75 Ω BNC cable to connect the ASI/SMPTE Input connector on the

RTX130B to the ASI/SMPTE Out connector on the MPEG analyzer.
See Figure 3-10.

MPEG analyzer rear panel (MTS430)

75 Ω BNC cable

Figure 3-10: Equipment connection for verifying the 8VSB record operat ion

52. Press the Record button on the RTX130B to display t he Record screen.

53. On the RTX130B, m ake the following settings:

Record menu

Source QAM/VSB.........

Record size 100 MB.....

Target RAM.........

QAM/VSB menu

BNC Port 310M 8VSB......

File menu

Save Mode Over Write.....

Save D:\Record_Files\S310M.trp...........

54. Set the MPEG analyzer to the Play mode.

55. Select File > Open on the MPEG analyzer to display the Open dialog box.

3-22

56. In the dialog box, navigate to the E:\MTXRTX_Test Streams\Re­cord_Files directory, and then select the S 310M.trp file.

RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

57. On the MPEG player, make the following settings:

Play menu

Update Off.........

Source RAM.........

SPI/ASI/310M menu

BNC Port 310M 8VSB......

Through Out Off....

58. Click the Play button on the MPEG analyzer to start playing the S310M.trp
file.

59. Verify that the hierarchic view is displayed on the RTX130B screen. In
addition, verify that the bit rate is 19.392 Mbps and packet size is 188 bytes.

60. Press the Record button on the RTX130B to record the file.

61. After recording is completed, click the Stop button on the MPEG analyzer.

62. Exit the MPEG Player application on the MPEG analyzer.

RTX130B rear panel

63. Disconnect the 75 Ω BNC cable from the RTX130B and MPEG analyzer.

Checking the Recorded File.

64. Use the 75 Ω BNC cable to connect the ASI/SMPTE Output connector on
the RTX130B to the ASI/SMPTE In connector on the MPEG analyzer.
See Figure 3-11.

MPEG analyzer rear panel (MTS430)

75 Ω BNC cable

Figure 3-11: Equipment connection for verifying the recorded file- SMPTE310M interface

RTX130B QAM & VSB RF Signal Generator Service Manual

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Performance Verification

65. Press the Play/Pause button on the RTX130B to display the Play screen.

66. Open the 310M.trp file on the RTX130B.

a. Select File > Open to open the Select File dialog box.

b. In the dialog box, navigate to the D:\Record_Files directory, and then

select the 310M.trp file.

67. Select Play > Update > On.

68. Press the Play/Pause button to start playing the file.

69. Start the TS Compliance Analyzer on the MPEG analyzer.

70. In the Open Transport Stream dialog box, select Real-time Analysis,and

then make the following settings:

Interfaces ASI...........

Interface Settings Time Stamping....

RF Output

71. Verify that the hierarchic view is displayed on the MPEG analyzer screen
and that no error messages appear. In addition, verify that the bit rate is

19.392 Mbps and that the packet size is 188 bytes.

NOTE. Ignore 3.4.a Unref PID error in the Priority 3 row.

72. Press the Stop button on t he RTX130B to stop the stream output.

73. Disconnect the 75 Ω BNC cable from the RTX130B and MPEG analyzer.

74. Delete the Record_Files folder on the D: drive of the RTX130B.

This test verifies the RF output. If the RTX130B has more than one modulation
option, then repeat this procedure for each option. The following equipment is
required for this test:

Equipment
required

MPEG transport stream monitor

PC (for controlling the MPEG transport stream monitor)

Two 20 dB attenuators (75 Ω)

BNC(Fe)-to-F(Ma) adapter

3-24

75 Ω BNC cable

Crossover Ethernet cable

Flower.trp file

RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

Initial Setup for the RTX130B.

1. Open the Flower.trp file on the RTX130B.

a. Select File > Open to open the Select File dialog box.

b. In the dialog box, navigate to the D:\525 directory, and then select the

Flower.trp file.

2. Select Play > Clock to open the Clock dialog box.

3. In the dialog box, select the Fixed ES Rate check box.

4. Select Play > Update > On.

5. Select Play > Other to open the Others dialog box.

a. Set Standard to MPEG2.

b. Select Update, and then set Update Method to Hardware in the Select

Update Item dialog box.

6. Select QAM/VSB > RF Output > On.

7. Select QAM/VSB > Modulation to open the Modulation dialog box.

8. In the dialog box, make the following settings:

Standard to match the standard to be tested..................

Modulation 64 QAM (except for the ATSC...............

standard)

Symbol Rate 5 M sps (for Annex A or C)..............

RF Center Frequency 200 MHz.......

RF Level 45 dBmV.................

Output RF...................

9. Press the Play/Pause button on the RTX130B to start playing the Flower.trp
file.

RTX130B QAM & VSB RF Signal Generator Service Manual

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Performance Verification

Checking the Output for Errors.

10. Use the 75 Ω BNC cable, two 20 dB attenuators, and BNC(Fe)-to-F(Ma)

adapter to connect the RF Out connector on the RTX130B to the RF input on
the MPEG transport stream monitor. See Figure 3-12.

NOTE. For the MTM400 Option QB2 and Option VS, use the RF cable (Tektronix

part number 174-5135-00) to connect the ASI/SMPTE OUT connector on the
interface card to the ASI/SMPT IN connector on the Transport Processor card.

11. Use the crossover Ethernet cable to connect the MPEG transport stream
monitor to a PC. See Figure 3-12.

PC

RTX130B rear panel

Crossover Ethernet cable

75 Ω BNC cable

Figure 3-12: Equipment connection for checking the output for errors

MPEG transport stream monitor rear panel (MTM400)

ٛ

ٛ
ٛ

BNC(Fe)-to-F(Ma) adapter

Two 20 dB attenuators

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RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

12. Set the MPEG transport stream monitor as indicated below by clicking the
item button:

Configuration screen:

Standard DVM (QAM module) or...............

MPEG (8 VSB module)

Region (or Type) Standard........

Interface QAM A/B/C or 8 VSB Interface...............

Stream Name don’t care...........

Template Checking unchecked......

Maintenance Mode unchecked......

QAMSettingsorInterfaceSettingsdialogbox:(click the Config... button
on the Configuration screen.)

H ForAnnexAandC:

Rx Frequency [MHz] 200.0.......

Symbol Rate [MS/s] 5.0........

Constellation 64..............

Inversion unchecked.................

PLL Bandwidth Normal............

AFG Range Normal...............

Analysis Mode MPEG............

H For Annex B:

Tuner Frequency 200000 kHz...........

Modulation Format auto.........

Interleaving Mode auto..........

Carrier Lock normal..............

Tuner Phase Noise high.........

Equalization Range normal.........

H For ATSC:

Tuner Frequency 200000 kHz...........

IF Spectrum normal..............

Channel State auto.............

NTSC Rejection Filter auto......

Carrier Lock normal..............

Tuner Phase Noise normal.........

Signal Detection VSB...........

RTX130B QAM & VSB RF Signal Generator Service Manual

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Performance Verification

TestsGroupedbyPriority123screen(see Figure 3-13):

All tests should be enabled with the following exceptions: 1. 6 PID and 2.2
CRC should be disabled. Any Table test that refers to a table other than PAT
or PMT should also be disabled. For example, disable any reference to NIT,
SDT, EIT, RST, and TDT. (These are Priority 3 tests.) Right click the state
icon for 2.3a PCR Repetition, select Properties, and then set the time value
to 50 ms.

3-28

Figure 3-13: Tests Grouped by Priority123screen(AnnexA)

NOTE. Some status icons may turn white by themselves. This is acceptable and

indicates that these tests do not apply.

PIDs screen: (only for the ATSC standard)

Unref PID test should be disabled.

13. When the status icon in the Tests screen have all turned yellow or green
(except for disabled or not applicable tests), right click the Transport
Stream Available status icon, and then select Reset. Within a minute, all
status icons turn green.

14. Click the Input Card button on the Configuration screen.

RTX130B QAM & VSB RF Signal Generator Service Manual

Performance Verification

15. Verify that the measurement values are as follows (wait few minutes until the
values become stable):

EVM (QAM A/B/C): < 2.7%
EVM (8 VSB): < 4.5%

16. Change RF Center Frequency to 450 MHz on the RTX130B.

a. Select QAM/VSB > Modulation to open the Modulation dialog box.

b. In the dialog box, set the RF Center Frequency to 450MHz.

c. Select the OK button.

d. Press the Play/Pause button t o output the RF signal.

17. Change Tuner Frequency in the Input Card dialog box to 450 MHz on the

MPEG transport stream monitor.

18. When the status icon in the Tests screen have all turned yellow or green
(except for disabled or not applicable tests), right click the Transport
Stream Available status icon, and then select Reset. Within a minute, all
status icons turn green.

19. Repeat steps 14 and 15.

20. Repeat steps 16 through 19 for the frequency of 750 MHz.

21. Disconnect the 75 Ω BNC cable from the RTX130B.

RTX130B QAM & VSB RF Signal Generator Service Manual

3-29

Performance Verification

q

p

IEEE1394b Interface

This test verifies that the IEEE1394b interface is functioning correctly.

Equipment
required

IEEE1394b hard disk drive

IEEE1394b cable (9 pin--9 pin))

test40.TRP file

1. Use the IEEE1394b cable to connect the IEEE1394b connector on the
RTX130B to the IEEE1394b hard disk drive. See Figure 3-14.

RTX130B rear panel

IEEE1394b hard disk drive

IEEE1394b cable

Figure 3-14: Equipment connection for checking the IEEE1394b interface

2. Select Play > Minimize to minimize the RTX130B application.

3. Po wer on the IEEE1394b hard disk drive.

4. Double-click the My Computer icon on the Windows desktop to open the

My Computer window.

5. In the Window, verify that the hard disk drive is recognized as the F: (or G:)
drive.

6. Use t he windows file copy operation to copy the test40.TRP file on the D:
drive to F: (or G:) drive.

7. Verify that the test40.TRP file is copied to the F : (or G:) drive correctly.

8. Delete the test40.TRP file from the F: (or G:) drive.

9. Power off the IEEE1394b hard disk drive.

This completes the RTX130B performance verification.

3-30

RTX130B QAM & VSB RF Signal Generator Service Manual

Maintenance

Maintenance

This section contains the information needed to do periodic and corrective
maintenance on the RTX130B. The following subsections are included:

H Preparation

H Inspection and Cleaning

H Removal and Installation Procedures

H Verifying the BIOS Configuration

H Troubleshooting

H System Software Recovery

H Using the Recovery Disc

Related Maintenance Procedures

The following sections contain information and procedures related to mainte­nance.

H Section 2, Theory of Operation, contains a circuit description at the module

or block level.

H Section 3, Performance Verification, contains procedures that may be useful

in isolating problems to modules by testing the RTX130B performance.

H Section 6, Diagrams, contains a block diagram using individual modules as

blocks and an interconnection diagram showing connections between the
modules.

H Section 7, Replaceable Parts List, lists all field replaceable modules by part

number.

RTX130B QAM & VSB RF Signal Generator Service Manual

4-1

Maintenance

Preparation

Before servicing this product, read the General Safety Summary, Safety
Summary, and Introduction at the front of the manual, and the following ESD

information.

CAUTION. Static discharge can damage any semiconductor component in the

RTX130B.

Preventing ESD

When performing any service that requires internal access to the RTX130B,
adhere to the following precautions to avoid damaging internal modules and their
components due to electrostatic discharge (ESD).

1. Minimize handling of static-sensitive modules.

2. Transport and store static-sensitive modules in their static protected

containers or on a metal rail. Label any package that contains static-sensitive
modules.

3. Discharge the static voltage from your body by wearing a grounded antistatic
wrist strap while handling these modules. Perform service of static-sensitive
modules only at a static-free work station.

4. Do not allow anything capable of generating or holding a static charge on the
work station surface.

5. Handle circuit boards by the edges when possible.

6. Do not slide the modules over any surface.

7. Avoid handling modules in areas that have a floor or work-surface covering

capable of generating a static charge.

4-2

RTX130B QAM & VSB RF Signal Generator Service Manual

Inspection and Cleaning

Inspection and Cleaning describes how to inspect for dirt and damage. It also
describes how to clean the exterior and interior of the RTX130B. Inspection and
cleaning are done as preventive maintenance. Preventive m aintenance, when
done regularly, may prevent the RTX130B from malfunctioning and enhance its
reliability.

Preventive maintenance consists of visually inspecting and cleaning the
RTX130B and using general care when operating it.

How often preventative maintenance should be performed depends on the
severity of the environment in which the RTX130B is used. A proper time to
perform preventive maintenance is just before the RTX130B adjustment.

Maintenance

General Care

Inspection and Cleaning

Procedures

The cabinet helps keep dust out of the RTX130B, and is needed to meet EMI and
cooling requirements. The cabinet should be in place when operating the
RTX130B. The front cover protects t he front panel and display from dust and
damage. Install the front cover when storing or transporting the RTX130B.

Inspect and clean the RTX130B as often as operating conditions require. The
collection of dirt on components inside can cause them to overheat and break­down. (Dirt acts like an insulating blanket, preventing efficient heat dissipation.)
Dirt also provides an electrical conduction path that could cause an RTX130B
failure, especially under high-humidity conditions.

CAUTION. Avoid the use of chemical cleaning agents that might damage the

plastics used in this RTX130B. Use only deionized water when cleaning the
menu buttons or front-panel buttons. Use an ethyl alcohol solution as a cleaner
and rinse with deionized water.

Inspection — Exterior. Inspect the outside of the RTX130B for damage, wear, and
missing parts, using Table 4-1 as a guide. An RTX130B that appears to have
been dropped or otherwise abused should be checked thoroughly to verify correct
operation and performance. Immediately repair defects that could cause personal
injury or lead to further damage to the RTX130B.

RTX130B QAM & VSB RF Signal Generator Service Manual

4-3

Maintenance

Table 4-1: External inspection check list

Item Inspect for Repair action

Cabinet, front panel,
and cover.

Cracks, scratches, deformations,
damaged hardware or gaskets.

Repair or replace defective
module.

Front-panel buttons Missing, damaged, or loose

buttons.

Connectors Broken shells, cracked insulation,

and deformed contacts. Dirt in
connectors.

Accessories Missing items or parts of items,

bent pins, broken or frayed
cables, and damaged connec­tors.

Repair or replace missing or
defective buttons.

Repair or replace defective
modules. Clear or wash out dirt.

Repair or replace damaged or
missing items, frayed cables, and
defective modules.

Cleaning Procedure — Exterior. To clean the RTX130B exterior, perform the
following steps:

1. Remove loose dust on t he outside of the RTX130B with a lint-free cloth.

2. Remove remaining dirt with a lint-free cloth dampened in a general purpose

detergent-and-water solution. Do not use abrasive cleaners.

3. Clean the light filter protecting the monitor screen with a lint-free cloth
dampened with a gentle, general purpose detergent-and-water solution.

CAUTION. To prevent getting moisture inside the RTX130B during external

cleaning, use only enough liquid to dampen the cloth or applicator.

4-4

RTX130B QAM & VSB RF Signal Generator Service Manual

Maintenance

Inspection — Interior. To access the inside of the RTX130B for inspection and
cleaning, refer to the Removal and Installation Procedures in this section.

Inspect the internal portions of the RTX130B for damage and wear, using
Table 4-2 as a guide. Defects found should be repaired immediately.

CAUTION. To prevent damage from electrical arcing, ensure that circuit boards

and components are dry before applying power to the RTX130B.

Table 4-2: Internal inspection check list

Item Inspect for Repair action

Circuit boards Loose, broken, or corroded

solder connections. Burned
circuit boards. Burned, broken, or
cracked circuit-run plating.

Remove failed module and
replace with a fresh module.

Resistors Burned, cracked, broken, blis-

tered condition.

Solder connections Cold solder or rosin joints. Resolder joint and clean with

Capacitors Damaged or leaking cases.

Corroded solder on leads or
terminals.

Semiconductors Loosely inserted in sockets.

Distorted pins.

Wiring and cables Loose plugs or connectors.

Burned, broken, or frayed wiring.

Chassis Dents, deformations, and dam-

aged hardware.

Remove failed module and
replace with a fresh module.

isopropyl alcohol.

Remove damaged module and
replace with a fresh module from
the factory.

Firmly seat loose semiconduc­tors. Remove devices that have
distorted pins. Carefully straight­en pins (as required to fit the
socket), using long-nose pliers,
and reinsert firmly. Ensure that
straightening action does not
crack pins, causing them to
break off.

Firmly seat connectors. Repair or
replace modules with defective
wires or cables.

Straighten, repair, or replace
defective hardware.

RTX130B QAM & VSB RF Signal Generator Service Manual

4-5

Maintenance

Cleaning Procedure — Interior. To clean the RTX130B interior, perform the
following steps:

1. Blow off dust with dry, low-pressure, deionized air (approximately 9 psi).

2. Remove any remaining dust with a lint-free cloth dampened in ethyl alcohol

and rinse with warm deionized water. (A cotton-tipped applicator is useful
for cleaning in narrow spaces and on circuit boards.)

STOP. If, after performing steps 1 and 2, a module is clean upon inspection, skip
the remaining steps.

3. If steps 1 and 2 do not remove all the dust or dirt, the RTX130B may be
spray washed using a solution of ethyl alcohol by performing steps
4 through 8.

4. Gain access to the parts to be cleaned by removing easily accessible shields
and panels (see Removal and Installation Procedures).

5. Spray wash dirty parts with the ethyl alcohol and wait 60 seconds for the
majority of the alcohol to evaporate.

6. Use hot (120 _F to 140 _F) deionized water to thoroughly rinse them.

7. Dry all parts with low-pressure, deionized air.

8. Dry all components and assemblies i n an oven or drying compartment using

low-temperature (125 _F to 150 _F) circulating air.

Lubrication. There is no periodic lubrication required for the RTX130B.

4-6

RTX130B QAM & VSB RF Signal Generator Service Manual

Removal and Installation Procedures

This section contains procedures for removal and installation of all mechanical
and electrical modules.

Preparation

WARNING. Before performing this or any other procedure in this manual, read
the Safety Summary found at the beginning of this manual. Also, to prevent
possible damage to components of the RTX130B, read Preventing ESD in this
section.

This subsection contains the following items:

H Preparatory information that you need to properly perform the procedures

that follow.

H List of tools required to remove and disassemble all modules.

H Three module locator diagrams for finding the External modules (see

Figure 4-2 on page 4-11), Board modules (see Figure 4-3 on page 4-12), and
Internal modules (see Fi gure 4-4 on page 4-13).

H Procedures for removal and reinstallation of the electrical and mechanical

modules.

H A disassembly procedure for removal of all the major modules from the

RTX130B at one time and for reassembly of those modules into the
RTX130B. Such a complete disassembly is normally only done when
completely cleaning the RTX130B. (Instructions for doing the actual
cleaning are found under Inspection and Cleaning at the beginning of this
section.)

WARNING. Before performing any procedure in this subsection, disconnect the
power cord from the line voltage source. Failure to do so could cause serious
injury or death.

RTX130B QAM & VSB RF Signal Generator Service Manual

4-7

Removal and Installation P rocedures

General Instructions

Summary of Procedures

Read these general instructions before removing a module.

First read over the Summary of Procedures that follows to understand how the
procedures are grouped. Then read Equipment Required for a list of the tools
needed to remove and i nstall modules in the RTX130B.

If you are removing a module for service, begin by performing the procedure
Access Procedure (page 4-14). By following the i nstructions in that procedure,
you remove the module to be serviced while removing the minimum number of
additional modules.

The procedures are described in the order in which they appear in this section. In
addition, you can look up any procedure for removal and reinstallation of any
module in the Table of Contents of this manual.

H The Access Procedure on page 4-14 first directs you to the procedure(s) (if

any) that are required to access the module to be serviced, then it directs you
to the procedure to remove that module.

Table 4-3: Summary of procedures

Procedure Module Page

Procedures for
External Modules

H Cabinet
H Right-side cover
H Left-side cover

H Front-panel unit
H Front-panel assembly

4-15

Procedures for Board
Modules

Procedures for Internal
Module

H A180 QAM Modulator

board

H A12 Main board
H CPU board

H Hard disk drive
H Internal and external

fans

H 12 V main power supply

H A20 PCI Backplane

board

H Printer connector

H A40 AC Distributor

board

H RFI filter

4-21

4-26

4-8

RTX130B QAM & VSB RF Signal Generator Service Manual

Removal and Installation P rocedures

Required Equipment. Most modules in this RTX130B can be removed with a
screwdriver handle mounted with a size T-10 Torx screwdriver tip. Use this tool

whenever a procedure step instructs you to remove or install a screw unless a
different size screwdriver is specified in that step. All equipment required to

remove and reinstall each module is listed in the first step of its procedure.

Table 4-4: Tools required for module removal

Item
No.

1 Screwdriver handle Accepts Torxr-driver bits

2 T-10 Torxr tip Tor x r- driver bit for T-10 size screw heads

3 T-15 Torxr tip Tor x r- driver bit for T-15 size screw heads

4 Nut driver,1/4inch Standard tool

Name Description

RTX130B QAM & VSB RF Signal Generator Service Manual

4-9

Removal and Installation P rocedures

RTX130B Orientation

In this manual, procedures refer to “front,” “rear,” and “top” of the RTX130B.
Figure 4-1 shows how the s ides are referenced. Figures 4-2 through 4-4 show the
modules that make up the RTX130B.

4-10

Figure 4-1: RTX130B orientation

RTX130B QAM & VSB RF Signal Generator Service Manual

Removal and Installation P rocedures

Left-side cover

Right-side cover

Cabinet

Emat

(Play/Stop/Record)

Front panel

Figure 4-2: External modules

Emat (all others)

Front cover

LCD glass
shield

Keypad board
insulator

Keypad board

LCD inverter
board

Front-panel
Processor board

Front-panel bracket

LCD module

RTX130B QAM & VSB RF Signal Generator Service Manual

4-11

Removal and Installation P rocedures

A20 PCI Backplane board

A180 QAM Modulator board

Printer connector

Blank panel

Figure 4-3: Board modules

A12 Main board

CPU board

4-12

RTX130B QAM & VSB RF Signal Generator Service Manual

Hard disk drive
retainer

Removal and Installation P rocedures

12 V main power supply

RFI filter

External fan

A40 AC Distributor board

Hard disk drive

Figure 4-4: Internal modules

Internal fan

RTX130B QAM & VSB RF Signal Generator Service Manual

4-13

Removal and Installation P rocedures

Access Procedure

When you have identified the module to be removed for service, read General
Instructions found on page 4-8. Then use the flowchart in Figure 4-5 to

determine which procedures to use for removing the module. The removal
procedures end with installation instructions.

Locate the module to

be removed in

Figure 4-2 to 4-4.

Procedures for External Modules

Is

the module

in Figure

4-2?

No

Yes

Cabinet p.4-15
Right-side cover p.4-16
Left-side cover p.4-16
Front-panel unit p.4-18
Front-panel assembly p.4-19

Is

the module

in Figure

4-4?

Procedures for Internal Modules

Hard disk drive p.4-26

Yes

Internal and external fans p.4-28
12 V main power supply p.4-30
A40 AC Distributor board p.4-30
RFI filter p.4-31

Do the procedures,

Cabinet and Right and Left

Covers on page 4-15.

Procedures for Board Modules

Is

the module

in Figure

4-3 ?

No

Yes

A180 QAM Modulator board p.4-23
A12 Main board p.4-23
CPU board p.4-23
A20 PCI Backplane board p.4-24
Printer connector p.4-25

Figure 4-5: Guide to removal procedures

4-14

RTX130B QAM & VSB RF Signal Generator Service Manual

Procedures for External Modules

Perform the Access Procedure (page 4-14) before performing any procedure in
this group. This group contains the following procedures:

H Cabinet

H Right-side cover

H Left-side cover

H Front-panel unit

H Front-panel assembly

Removal and Installation P rocedures

Cabinet

1. Assemble equipment and locate module to be removed:

a. You need a screwdriver with a T-15 Torx tip.

b. Locate the cabinet in the locator diagram External modules, Figure 4-2,

page 4-11.

2. Orient the instrument: Set the RTX130B so its bottom is down on the work
surface and its rear is facing you.

3. Use a screwdriver with a T-15 Torx tip to remove the two screws securing
the cabinet to the RTX130B. See Figure 4-6 on page 4-16.

4. Grasp the right and left edges of the cabinet toward the back. Push the
chassis rear panel toward the front of the RTX130B to separate it from the
cabinet.

5. Slide the cabinet off t he RTX130B.

6. Reinstallation: Perform steps 3 through 5 in reverse order to reinstall the

cabinet.

RTX130B QAM & VSB RF Signal Generator Service Manual

4-15

Removal and Installation P rocedures

Right-Side Cover

Left-Side Cover

Figure 4-6: Cabinet removal

1. Assemble equipment and locate module to be removed:

a. You need a screwdriver with a T-10 Torx tip.

b. Locate the right-side cover in the locator diagram External modules,

Figure 4-2, page 4-11.

2. Orient the instrument: Set the RTX130B so its left side is down on the work
surface and its front is facing you.

3. Use a screwdriver with a T-10 Torx tip to remove the seven screws securing
the right-side cover to the top and bottom of the chassis. See Figure 4-7.

4. Remove the right-side cover from the chassis.

5. Reinstallation: Perform steps 3 and 4 in reverse order to reinstall the

right-side cover.

1. Assemble equipment and locate module to be removed:

a. You need a screwdriver with a T-10 Torx tip.

4-16

RTX130B QAM & VSB RF Signal Generator Service Manual

Removal and Installation P rocedures

b. Locate the left-side cover in the locator diagram External modules,

Figure 4-2, page 4-11.

2. Orient the instrument: Set the RTX130B so its right side is down on the
work surface and its front is facing you.

3. Use a screwdriver with a T-10 Torx tip to remove the six screws securing the
left-side cover to the top and bottom of the chassis. See Figure 4-7.

4. Remove the left-side cover from the chassis.

5. Reinstallation: Perform steps 3 and 4 in reverse order to reinstall the left-side

cover.

Figure 4-7: Right-side and left-side cover removal

RTX130B QAM & VSB RF Signal Generator Service Manual

4-17

Removal and Installation P rocedures

Front-Panel Unit

1. Assemble equipment and locate module to be removed:

a. You need a screwdriver with a T-10 Torx tip.

b. Locate the front-panel unit in the locator diagram External modules,

Figure 4-2, page 4-11.

2. Orient instrument: Set the RTX130B so its bottom is down on the work
surface and its front is facing you.

3. Remove front-panel unit: SeeFigure4-8.

a. Use a screwdriver with a T-10 Torx tip to remove the four screws

securing the front-panel unit t o the chassis.

b. Grasp the front-panel unit and pull it forward.

c. Disconnect the cable from J100 on the Front-Panel Processor board.

d. Disconnect the cable from J105 on the Front-Panel Processor board.

4. Reinstallation: Perform step 3 in reverse order to reinstall the front-panel

unit.

4-18

Figure 4-8: Front-panel unit removal

RTX130B QAM & VSB RF Signal Generator Service Manual

Removal and Installation P rocedures

Front-Panel Assembly

1. Assemble equipment and locate modules to be removed:

a. You need a screwdriver with a T-10 Torx tip.

b. Locate the front-panel assembly in the locator diagram External

modules, Figure 4-2, page 4-11.

2. Remove the front cover: See Figure 4-9 on page 4-20.

a. Press the two latches at the bottom of the front cover to release it from

the front cover bracket.

b. Pull the front cover forward, away from the front-panel bracket.

3. Remove the Front-Panel Processor board: See Figure 4-9 on page 4-20.

a. Disconnect the cables from J11, J301, and J321 on the Front-Panel

Processor board.

b. Use a screwdriver with with a T-10 Torx tip to remove the four screws

securing the Front-Panel Processor board to the front-panel bracket.

c. Lift the board away.

4. Remove the Keypad board: See Figure 4-9 on page 4-20.

a. Use a screwdriver with a T-10 Torx tip to remove the three screw

securing the Keypad board to the front-panel bracket.

b. Lift the board away.

5. Remove the LCD module: See Figure 4-9 on page 4-20.

a. Use a screwdriver with with a T-10 Torx tip to remove the four screws

securing the LCD module to the front-panel bracket.

b. Lift the LCD module away.

6. Now manually disassemble the front-panel assembly components using

Figure 4-9 as a guide. Reverse the procedure to reassemble.

7. Reinstallation: Perform steps 2 through 6 in reverse order to reinstall the
front-panel assembly.

RTX130B QAM & VSB RF Signal Generator Service Manual

4-19

Removal and Installation P rocedures

Emat

(Play/Stop/Record)

Front-Panel

Processor board

Keypad board
insulator

LCD inverter board

Front-panel bracket

LCD module

Emat (all others)

Front cover

Figure 4-9: Disassembly of front-panel assembly

LCD glass

Keypad board

shield

4-20

RTX130B QAM & VSB RF Signal Generator Service Manual