Nautel VX150 Manuel utilisateur

3: TROUBLESHOOTING MANUAL

VX150 TO VX2

FM BROADCASTTRANSMITTER

Document ID: NHB-VX150-VX2-TRB

Version: 0.1

Issue Date: 2020-12-01

Status: Preliminary

VERSION 0.1 2020-12-01 PAGE III

VX150 TO VX2 TROUBLESHOOTING MANUAL

Contact Information

Nautel Limited

10089 Peggy’s Cove Road

Hackett’s Cove, NS Canada B3Z 3J4

Toll Free: +1.877.6NAUTEL (662.8835)

(Canada & USA only) or

Phone: +1.902.823.3900 or

Fax: +1.902.823.3183

Nautel Inc.

201 Target Industrial Circle

Bangor, Maine USA 04401

Phone: +1.207.947.8200

Fax: +1.207.947.3693

Customer Service (24-hour support)

+1.877.628.8353 (Canada & USA only)

+1.902.823.5100 (International)

Email: [email protected]

Web: www.nautel.com

The comparisons and other information provided in this document have

been prepared in good faith based on publicly available information.

For verification of materials, the reader is encouraged to consult the

respective manufacturer's most recent publication on the official

website or through contact with Customer Service.

VX150 TO VX2 TROUBLESHOOTING MANUAL TABLE OF CONTENTS

VERSION 0.1 2020-12-01 PAGE 3.V

CONTENTS

Contact Information 3.iii

Responding to alarms 3.1.1

Corrective Maintenance 3.1.1

Electrostatic Protection 3.1.3

Identifying and Troubleshooting an Alarm 3.1.4

Replacement Procedures 3.1.17

Pre-Amplifier/IPA PWB Replacement 3.1.18

Power Amplifier PWB Replacement 3.1.20

Power Supply Module Replacement 3.1.23

Parts Information 3.2.1

Family Tree 3.2.1

How to Locate Information About a Specific Part 3.2.1

Column Content 3.2.2

Reading Electrical Schematics 3.3.1

Component Values 3.3.1

Graphic and Logic Symbols 3.3.1

Reference Designations 3.3.1

Unique Symbols 3.3.2

Identifying Schematic Diagrams 3.3.2

Structure of Schematics 3.3.3

Locating Schematic Diagram(s) for a Functional Block 3.3.3

Locating a Part or Assembly on a Schematic 3.3.4

VX150 TO VX2 TROUBLESHOOTING MANUAL TABLE OF CONTENTS

PAGE 3.VI VERSION 0.1 2020-12-01

Mechanical Drawings 3.4.1

Identifying Mechanical Drawings 3.4.1

Content of Mechanical Drawings 3.4.1

Locating a Part or Assembly on a Mechanical Drawing 3.4.1

List of terms 3.5.1

VX150 TO VX2 TROUBLESHOOTING MANUAL

VERSION 0.1 2020-12-01 PAGE VII

RELEASE CONTROL RECORD

ISSUE DATE REASON

0.1 2020-12-01 Preliminary release for VX150 to VX2. Supports hardware

versions:

VX150, VX300, VX600 (NARF81)

VX1 (NARF79)

VX1.5. VX2 (NARF80)

Supports software version VX SW 1.0 and later.

VX150 TO VX2 TROUBLESHOOTING MANUAL

PAGE 3.VIII VERSION 0.1 2020-12-01

VX150 TO VX2 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

VERSION 0.1 2020-12-01 PAGE 3.1.1

SECTION 3.1: RESPONDING TO ALARMS

This section provides instructions you need when performing troubleshooting on the VX150 to VX2

transmitter. This section includes the following topics:

Corrective Maintenance

Electrostatic Protection - see page 3.1.3

Identifying and Troubleshooting an Alarm - see page 3.1.4

Replacement Procedures - see page 3.1.17

If none of the procedures and alarms described in this section address your problem, contact Nautel for

assistance. See “Technical Support” in the Installation Manual.

Corrective Maintenance

Corrective maintenance procedures consist of identifying and correcting defects or deficiencies that

arise during transmitter operation. Local and/or remote alarm signals are generated when a

malfunction occurs. If an alarm condition is caused by a malfunction in the RF power stage, the

transmitter may maintain operation at a reduced RF output level. The nature of the fault – and station

policy – will dictate whether an immediate maintenance response is necessary. Fault analysis and

rectification may be conducted from three different levels, with a different technical competence level

required for each: on-air troubleshooting, remote or local, and off-air troubleshooting.

On-Air Troubleshooting

On-air troubleshooting can be performed from a remote location, or locally at the transmitter site.

Remote Troubleshooting

Remote on-air troubleshooting consists of monitoring the transmitter's radiated signal using an on-air

monitor or via a LAN connection, and observing the status of each remote fault alarm indicator.

Information obtained from these sources should enable an operator to decide whether an alarm

response may be deferred to a more convenient time, an immediate corrective action must be taken, or

CAUTION! The transmitter contains many solid state devices that may be damaged

if subjected to excessive heat or high voltage transients. Take every effort to ensure

that circuits are not overdriven or disconnected from their loads while turned on.

VX150 TO VX2 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

PAGE 3.1.2 VERSION 0.1 2020-12-01

if a standby transmitter must be enabled (if one is available). It is recommended that the significance of

remote indications, and the appropriate responses, be incorporated into a station's standard operating

procedures. Refer to “Identifying and Troubleshooting an Alarm” on page 3.1.4 to determine the remedial

action required for a given fault.

Local Troubleshooting

Local on-air troubleshooting consists of monitoring the transmitter's integral meters and fault alarm

indicators. Analysis of this data will normally identify the type of fault, and in most cases will determine

what corrective action must be taken. Refer to “Identifying and Troubleshooting an Alarm” on page 3.1.4

to determine the remedial action required for a given fault.

Off-Air Troubleshooting

Off-air troubleshooting must be performed when routine on-air calibration adjustments will not restore

operation.

It is recommended that the transmitter’s output be connected to a precision 50 resistive dummy load

(rated for at least the maximum transmitter power rating) before starting off-air troubleshooting

procedures. If an appropriate dummy load is not available, troubleshooting for a majority of faults can

be performed with RF power turned off. The transmitter may remain connected to its antenna system

for these procedures.

NOTE:

Reduce the RF output level to a minimal value when troubleshooting faults in the power

amplifier stage while the transmitter’s RF output is connected to the antenna system

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