Nautel VS300 Manuel de programmation

VS300 Transmitter

Troubleshooting Manual

Document:NHB-VS300-TRB

Issue: 6.0 2014-11-01

Status: Standard

Nautel Limited

10089 Peggy’s Cove Road

Hackett’s Cove, NS Canada B3Z 3J4

Phone: +1.902.823.3900 or

Toll Free: +1.877.6NAUTEL (6628835) (Canada & USA only)

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. The reader is encouraged to consult the respective

manufacturer's most recent published data for verification.

VS300 Troubleshooting Manual Table of contents

Page v

Contents

Release control record vii

Responding to alarms 1-1

Corrective maintenance 1-1

Electrostatic protection 1-3

Identifying an alarm 1-4

Troubleshooting tips 1-23

Replacing a suspect PWB, power supply or fan 1-24

PA PWB replacement 1-26

Pre-amp PWB replacement 1-28

Power Supply Module Replacement 1-30

+48 V Power Supply Replacement 1-31

LVPS Replacement 1-32

Cooling fan replacement 1-33

Exciter/Control PWB Replacement 1-35

PS Distribution PWB Replacement 1-38

Output power probe PWB replacement 1-39

Detailed Circuit Descriptions 2-1

Exciter/control PWB (NAPE87A) 2-1

PS distribution PWB (NAPS40) 2-2

Pre-amplifier PWB (NAPA27A) 2-3

Power amplifier PWB (NAPA23/03) 2-3

Parts Lists 3-1

Parts information 3-1

Family tree 3-1

How to locate information about a specific part 3-1

VS300 Troubleshooting Manual Table of contents

Page vi Issue 6.0 2014-11-01

Column content 3-2

OEM code to manufacturer’s cross-reference 3-3

Common abbreviations/acronyms 3-4

Wiring/connector lists 4-1

Wiring lists provided 4-1

Wiring lists not provided 4-1

Connector mating information 4-1

Wire colours 4-1

Printed wiring board patterns 4-1

Reading Electrical Schematics 5-1

Component values 5-1

Graphic symbols 5-1

Logic symbols 5-1

Reference designations 5-1

Unique symbols 5-2

Identifying schematic diagrams 5-2

Structure of schematics 5-2

Locating schematic diagram(s) for a functional block 5-3

Locating a part or assembly on a schematic 5-3

Mechanical Drawings 6-1

Identifying mechanical drawings 6-1

Content of mechanical drawings 6-1

Locating a part or assembly on a mechanical drawing 6-1

List of terms 7-1

VS300 Troubleshooting Manual

Issue 6.0 2014-11-01 Page vii

Release control record

Issue Date Reason

6.0 2014-11-01 Hardware Release 6 (NARF64E and NARF64E/01).

Supports software version VS SW 4.2

VS300 Troubleshooting Manual

Page viii Issue 6.0 2014-11-01

VS300 Troubleshooting Manual Responding to alarms

Issue 6.0 2014-11-01 Page 1-1

Section 1: Responding to alarms

This section provides instructions you need when performing troubleshooting on the VS300

transmitter. This section includes the following topics:

•Corrective maintenance

•Electrostatic protection - see page 1-3

•Identifying an alarm - see page 1-4

•Troubleshooting tips - see page 1-23

–AUI lockup - see page 1-23

•Replacing a suspect PWB, power supply or fan - see page 1-24

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

for assistance. See “Technical support” on page ix.

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.

CAUTION:

The transmitter contains many solid state devices that may be damaged if

subjected to excessive heat or high voltage transients. Every effort must be taken

to ensure that circuits are not overdriven or disconnected from their loads while

turned on.

VS300 Troubleshooting Manual Responding to alarms

Page 1-2 Issue 6.0 2014-11-01

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 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 an alarm” on page 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 an alarm” on page 1-4 to

determine the remedial action required for a given fault.

The power amplifier stage contains an integral modular reserve (IMR) feature. This feature permits

the transmitter to operate at a reduced RF output level when a malfunction occurs in one of its power

modules. Station operating procedures will dictate whether a reduced RF output level is acceptable.

When a reduced RF output level can be tolerated, replacement of the defective RF components may

be deferred to a convenient time.

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 of 330 W) before starting off-air

troubleshooting procedures. If an appropriate dummy load is not available, troubleshooting for a

majority of faults can be performed with the RF power stage turned off. The transmitter may remain

connected to its antenna system for these procedures.

CAUTION:

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

transmitter. This is particularly important when the transmitter’s cover is

removed - where possible overheating could occur - or when the transmitter is

connected to the antenna system.

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