Nautel VS300 Manual de programación

VS300 Transmitter

Troubleshooting Manual

Document:NHB-VS300-TRB

Issue: 10.0 2019-01-18

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 and troubleshooting an alarm 1-4

Troubleshooting tips 1-27

Operating in FM+HD mode with SWR Foldback 1-28

Replacing a suspect PWB, power supply or fan 1-29

PA PWB replacement 1-31

Pre-amp PWB replacement 1-33

Power Supply Module Replacement 1-36

+48 V Power Supply Replacement 1-37

LVPS Replacement 1-38

Cooling fan replacement 1-39

Exciter/Control PWB Replacement 1-41

PS Distribution PWB Replacement 1-44

Output power probe PWB replacement 1-45

Detailed Circuit Descriptions 2-1

Exciter/control PWB (NAPE87B) 2-1

PS distribution PWB (NAPS40) 2-2

Pre-amplifier PWB (NAPA27A) 2-3

Power amplifier PWB (NAPA23/03) 2-3

VS300 Troubleshooting Manual Table of contents

Page vi Issue 10.0 2019-01-18

Parts Lists 3-1

Parts information 3-1

Family tree 3-1

How to locate information about a specific part 3-1

Column content 3-2

Common abbreviations/acronyms 3-3

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 5-3

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

Locating a part or assembly on a schematic 5-4

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 10.0 2019-01-18 Page vii

Release control record

Issue Date Reason

10.0 2019-01-18 Supports hardware NARF64I/02 and NARF64I/03.

Supports software version VS SW 5.2 and higher.

VS300 Troubleshooting Manual

Page viii Issue 10.0 2019-01-18

VS300 Troubleshooting Manual Responding to alarms

Issue 10.0 2019-01-18 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 and troubleshooting an alarm - see page 1-4

•Troubleshooting tips - see page 1-27

–AUI lockup - see page 1-27

•Replacing a suspect PWB, power supply or fan - see page 1-29

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 10.0 2019-01-18

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

and troubleshooting an alarm” on page 1-4 to determine the remedial action 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 1-4 to determine the remedial action 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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