mcmurdo NAV-7 Manuel utilisateur
mcmurdo
NAV-7
GMDSS Tri
GMDSS TriGMDSS Tri
GMDSS Tri-
--
-channel NAVTEX Receiver
channel NAVTEX Receiverchannel NAVTEX Receiver
channel NAVTEX Receiver
Service Manual
Service ManualService Manual
Service Manual
Commercial in Confidence 35-506 Iss 1
NAV-7 Service Manual Page 1
Table of Contents
1. Introduction ..........................................................................................................3
1.1. Scope..............................................................................................................4
1.2. Applicability .....................................................................................................4
1.3. Servicing equipment .......................................................................................4
1.4. Safety notices .................................................................................................5
. Assessment ..........................................................................................................7
2.1. aintenance tasks..........................................................................................7
2.2. Routine testing ................................................................................................7
2.3. Assessment ....................................................................................................8
3. Maintenance procedures...................................................................................10
3.1. Inspection......................................................................................................10
3.2. Functional test...............................................................................................10
3.3. Disassembly..................................................................................................12
3.4. Reassembly ..................................................................................................18
3.5. Leak Testing .................................................................................................20
3.6. Factory Reset................................................................................................21
3.7. Receiver Set up ............................................................................................21
3.8. Software Download.......................................................................................22
4. Fault finding........................................................................................................ 3
4.1. NAVTEX Update — Optimising Reception...................................................23
4.2. Fault location.................................................................................................24
4.3. Service Bulletin 08 ........................................................................................25
5. Repair procedures ............................................................................................. 7
6. Spares ................................................................................................................. 8
Appendix 1 : Specification ....................................................................................... 9
This document is c urdo Limited copyright (©) and contains proprietary owned intellectual property rights and
confidential data. All rights are strictly reserved. The information must not be used except for the agreed purpose.
Unauthorised use, reproduction or issue to any third party is not permitted without the prior written authority of
c urdo Limited. This document is to be returned to c urdo Limited when the agreed purpose is fulfilled.
Commercial in confidence 35-506 Iss 1
NAV-7 service manual Page 2
Commercial in Confidence 35-506 Iss 1
NAV-7 Service Manual Page 3
1. INTRODUCTION
NAVTEX is a method of transmitting navigational warnings and weather forecasts
from designated coast radio stations. All English language transmissions are
made on 518 kHz. Each station is allocated several time ‘slots’ during the day,
when it is permitted to transmit; these are normally at four hourly intervals. The
only exceptions to this are gale warnings and search and rescue messages,
which may be transmitted at any time.
Reception of NAVTEX is normally limited to an area of 200 - 300 miles radius
around each transmitting station, although considerably greater ranges are
possible at night.
Subject to I O approval, additional local language transmissions may be made
on 490 kHz and on 4209.5 kHz.
The NAV-7 has been designed to the latest European and International
specifications to provide up to date weather and marine safety information to
commercial vessels. It meets I O requirements under G DSS and is designed
for simplicity of operation. It will display reliable information day after day within
designated NAVTEX coverage areas.
Installation is straightforward. Connect the NAV-7 to a 12 or 24 volt DC supply
and connect a suitable antenna. Switch it on, and it will start displaying and
storing NAVTEX messages without further manual intervention. Note that if there
are only a couple of NAVTEX stations within range it may be several hours before
the first message is received.
If you are within an area where you are able to receive from many NAVTEX
stations (particularly at night), the NAV-7 may overwhelm you with information. It
can therefore be set up to display only those stations and message categories
you want to receive and which are applicable to the area in which you are sailing.
Normally, routine messages are repeated at four hourly intervals. Provided that
the NAV-7 is left running, repeated messages are not displayed more than once.
Each message is retained for three days (72 hours) after its last reception before
being automatically deleted, unless the message has been marked as locked.
Permanent installation of the NAV-7 can be made with either the bulkhead-
mounting bracket or the flush panel mounting kit provided.
The NAV-7 has been designed to meet the requirements of I O SC.148 (77)
and IEC 61097-6 (Ed 2.0).
The NAV-7 contains 3 receiver channels, one each tuned to 490 kHz, 518 kHz
and 4209.5 kHz. The NAV-7 will receive on all 3 frequencies simultaneously in
those parts of the world where transmissions are available (refer to Appendix I
and to the c urdo website at www.mcmurdo.co.uk for latest information).
Commercial in confidence 35-506 Iss 1
NAV-7 service manual Page 4
The NAV-7 can be setup to filter out stations and/or message categories that are not
required by the User.
The NAV-7 is capable of being connected to an Integrated Bridge System (IBS),
transferring NAVTEX messages to other navigational aids if required. Note that the
IBS must be compliant with the serial port requirements of IEC61097-6 (Ed 2.0).
The NAV-7 will accept UTC time & date information from the IBS port if available.
UTC time & date will be used to timestamp received NAVTEX messages.
1.1. Scope
This manual provides the instructions to enable routine and emergency servicing of
the NAVTEX equipment listed below. This manual represents the original equipment
manufacturer’s (OE ) service documentation applicable to these products.
1. . Applicability
This manual applies to the following NAVTEX equipment:
• c urdo NAV-7 Part number 35-850-001
1.3. Servicing equipment
The following tools and equipment is required to carry out the servicing detailed in
this procedure.
Equipment:
Active antenna (ACT-1)
Power supply (12-24V)
Handtools:
Calibrated torque driver (40-50cNm) with attachments:
5mm A/F socket
Small cross-headed screwdriver
Antistatic precautions
The electronics section of the NAV-7 is sensitive to electrostatic discharge (ESD)
which can cause immediate or hidden long term damage. It is important that the PCB
is only handled under suitable antistatic conditions.
Ideally, a fully grounded workstation, which has conductive
surfaces to avoid the build up of static charge, should be
used.
As a minimum, the operator must be connected to a good
earth point through a resistance of 1 ohm. This is usually
achieved by wearing a suitable wrist strap.
Commercial in Confidence 35-506 Iss 1
NAV-7 Service Manual Page 5
1.4. Safety notices
Please read the following information for your safety:
This product has been assessed as presenting negligible hazard in a sealed
serviceable state.
Safety analysis
The following table summarises the nature of the hazard which may be present when
the unit is opened or serviced; each hazard is discussed at greater length in the
detailed sections.
Hazard cause Hazard identification Precautions
High Voltage Risk of shock Handle appropriately, avoid
contact
General precautions for chemical agents (adhesives,
greases, IPA)
Observe all safety precautions relevant to the country of operation. As
a general rule, protective overalls, gloves and goggles should be worn
when handling these chemical agents, but different countries may have additional
requirements which must be observed.
Ensure that all chemical agents are handled in accordance with the manufacturer's
instructions, and that suitable protective clothing is worn.
ake sure that the working area is well ventilated, and that chemical substances are
not left exposed. Observe good hygiene practices; do not eat, drink or smoke when
handling chemicals.
Read the manufacturer's instructions before using any chemical agent.
Wear goggles Wear overalls Wash hands Wear gloves
Commercial in confidence 35-506 Iss 1
NAV-7 service manual Page 6
Commercial in Confidence 35-506 Iss 1
NAV-7 Service Manual Page 7
. ASSESSMENT
.1. Maintenance tasks
Service providers are reminded that it is their responsibility to ensure that the
procedures herein are followed, that only c urdo approved parts are fitted, and that
good practice is observed.
The functions which can be performed by service providers are:
• Routine testing
• Software download
• System set up
• Fault diagnosis
• Repair
. . Routine testing
NAV-7 has automatic Built In Test Equipment (BITE).
BITE runs all the time in the back ground and monitors for correct operation of the
receiver sub systems including the monitoring of antenna supply current.
In the event of an error being detected;
A fault indication icon may be displayed on screen
Front panel LED may flash (according to menu set up option)
Buzzer may sound (according to menu set up option)
Detail of the alarm event is displayed under the Alarm mode, current alarms
page.
Alarm events are sent over the data interface output port(s) using the ALR
sentence format.
Whatever the reason for the return the NAV-7 must be subjected to a full
assessment before any other action is taken. The agent has a responsibility to
ensure the NAV-7 is completely serviceable and is fit for its purpose.
Included in the user handbook are full details on:
• Installation
• Set up
• Operation
Therefore these items are not repeated in this manual.
Commercial in confidence 35-506 Iss 1
NAV-7 service manual Page 8
.3. Assessment
Every NAV-7 returned for servicing, of whatever nature, must be fully assessed to
determine its operational status.
Assessment form
The assessment form, shown on the next page, is an essential tool in performing
diagnosis. It may be used to support customer billing and must accompany any
warranty return to the manufacturer.
Autres manuels pour NAV-7
2
Table des matières
Autres manuels mcmurdo Récepteur
