Silva NX2 User manual

Latest update: 17 Feb -03
SERVICE MANUAL
Art. No: 20972-03
Edition No: 1

INTRODUCNX2.DOC Page 1 Latest update: 17 Feb. -03
INTRODUCTION
This service manual will give you the basic information how to perform faultfinding
and testing on the SILVA NX2 navigation system.
Silva have used a new double moulding technology and high precision
assembling procedure with a new gluing robot, hereby reaching the IP68/IP66
standard for all instruments.
This means that the NX2 instruments are sealed and can not be opened.
When finding a fault in a NX2 Instrument it has to be replaced and returned to
Silva according to the NX2 exchange system.
As faults and male function in the electronics of the NX2 System is very rare it is
essential to start checking wiring and connections on board the boat.
Also the settings in Set up and calibration have to be checked before judging the
instrument as faulty.
Faultfinding on instruments and transducers connected in a complete NX2
system, on board a vessel is well supported by signal sensors on all transducer
inputs of the Server.
With our NX2 exchange system, it is possible to obtain effective service without
much effort regarding time and tools.
In order to handle returns and warranty claims in a quick and safe way Silva
Sweden ask you to complete a NX2 Return Form for every returned unit.
This service manual will be upgraded with complementary information when
necessary and questions concerning service matters are always welcome to and
answered by undersigned.
Sollentuna, 17 February 2003
SILVA Sweden AB
Kjell Sahlberg
Service Manager

RegB-NX2.doc Page 1 Latest update: 17 Feb -03
Introduction Table of contents
1 General Information
Related NX2/Nexus Documents, Operation Manuals
and Product Type Numbers
2 NX2 Network – Brief Introduction
2.1 Protocol
2.2 NX2/Nexus User Policy
2.3 NX2/Nexus Product type with Possible Categories
2.4 Network start up and Initialisation
3 NX2 Network Error Message with Cause and
Remedy
4 NX2 Replacement system of defect transducer and
instrument
5 NX2 Faultfinding and test on board
5.1 – 5.5 On board tests
5.6 NX2 Fault finding guide
5.7 Server NMEA communication test
5.8 Using Multi Center to find reasons of Network faults
5.9 Return of faulty NX2 units to Agent or Silva
6 NX2 Server
6.1 Block circuit diagram
6.2 Trouble Shooting – Test wave forms Server
6.3 PCB Layout with test points
6.4 Circuit Diagram
7 Log Transducer
8 Depth Transducer and System
9 Wind Transducer
9.1 Service Measures
9.2 Replacing plug connector
10 Compass Transducer
11 Multi, Speed and Autopilot Instrument
12 Wind Data and Compass Data Instrument
13 Analogue Instrument - All
14 Multi XL Instrument
15 -
16 Remote Control Instrument
17 -
18 GPS Navigator Instrument
19 GPS Antenna
20 Multi Center Instrument
21 NX2/Nexus NMEA
22 -
23 NX2 Mechanical Spare Parts and Accessories

10geninfNX2.doc Page 1 Latest update: 17 Feb - 03
1. GENERAL INFORMATION
The Silva NX2 system is based round a central network manager, i.e. the Server,
see § 2.3. All transducers are connected to the Server which transmits data on a
Bus to all connected instruments.
In a limited system also the Wind Data, Compass Data and AUTOPILOT servo
can be the network manager.
The communication is of bus type, which means that information is transmitted
constantly and that each instrument reads the bus to collect data. The bus is RS
485. See § 2.
Silva NX2 can have a maximum of 32 communicating units, such as instruments,
Autopilot etc.
The NX2 Speed instrument can also work stand-alone, in this case the Log
transducer is connected direct to the instrument.
When upgrading with a Server the connection of the Log transducer should be
moved to the Server.
Silva NX2 instrument series is build according to IP68/IP66 standard which
means that the instruments are sealed and can not be opened.
Before starting a service procedure, check that the customer has all basic
settings correct.
Remedy in a NX2 system with customer claim should always start with a
thorough check according to the checkpoint list, see § 5.5 NX2 Faultfinding
Guide.
In most instances, repair is effected by replacing the defective unit with SILVA
NX2 exchange system. The Server and Wind, Compass and GPS transducers
can be repaired.
The water moisture, which all marine equipment are exposed to, have been
closely investigated. The following details will prevent moisture problem:
• Instrument front and window are produced as one pies in a new double
moulding technology giving no possibility for water intrude of the front.
• Push buttons are made out of a new silicone material.
• The Instrument front and the back cover are integrated in a new gluing robot
• No mounting screws through the front eliminates water ingress of the
instrument.
• The absence of an instrument gasket eliminates any possibility for water
ingress of the front.
• A Gore-texmembrane, covers a venting hole in the back cover. This will give
possibility for pressure balancing and air to circulate in a slow tempo, avoiding
sudden changes with the risk of moisture in the instrument.

10geninfNX2.doc Page 2 Latest update: 17 Feb - 03
• The air volume inside the instrument is kept to a minimum.
The contact points on the digital PCB are
gold plated which will avoid oxide from
developing with weak display segments
as a result.
Fault solving - NX2 Exchange System
The NEXUS NX2 System is adapted to an Exchange system of Instruments that
easily can be replaced if a fault is detected according to §5: NX2 FAULTFINDING
AND TESTS ON BOARD.
The national SILVA distributor keeps stock of NX2 Instruments to give the
customer a fast, safe and quick service.
Equipment for trouble shooting on board
§5: NX2 FAULTFINDING AND TESTS
ON BOARD and Digital multi-meter.
Repair of faulty Instruments
A faulty NX2 Instrument can only be repaired by Silva due to the high precision
re-assembling procedure and the special routines in the gluing robot.
Software Version
On every SILVA Instrument the software version is shown on the display during
the starting up procedure.
Moreover the software version is marked on the Type label on the back cover.

11RELDOCNX2.DOC Page 1 Latest update 9 December 2002
1.1 RELATED NX2 DOCUMENTS, OPERATION MANUALS
AND PRODUCT TYPE NUMBERS
APPENDIX
A. NEXUS Network Specification
B. Full Duplex NEXUS specification version 1.07
C. NEXUS NMEA 0183 Input/Output, version 1.1
D. NEXUS Network Software Versions
E. NMEA Standard 0183
GB = English, D = German, F = French, S = Swedish
User Manual
Art. No. NX2 Product & Product Art. No. Language
22172-1 Server
(
22120-1
)
GB
22172-2 Server
(
22120-1
)
S
22172-3 Server
(
22120-1
)
D
22172-4 Server
(
22120-1
)
F
22133-1 Multi Control
(
22117-3
)
GB
22133-2 Multi Control
(
22117-3
)
S
22133-3 Multi Control
(
22117-3
)
D
22133-4 Multi Control
(
22117-3
)
F
22131-1 S
p
eed Lo
g
(
22117-1
)
GB
22131-2 S
p
eed Lo
g
(
22117-1
)
S
22131-3 S
p
eed Lo
g
(
22117-1
)
D
22131-4 S
p
eed Lo
g
(
22117-1
)
F
22137-1
A
uto
p
ilot Inst.
,
Servo
,
RAT
(
22117-7
)
GB
22137-2
A
uto
p
ilot Inst.
,
Servo
,
RAT
(
22117-7
)
S
22137-3
A
uto
p
ilot Inst.
,
Servo
,
RAT
(
22117-7
)
D
22137-4
A
uto
p
ilot Inst.
,
Servo
,
RAT
(
22117-7
)
F
22134-1 Wind Data
(
22117-4
)
GB
22134-2 Wind Data
(
22117-4
)
S
22134-3 Wind Data
(
22117-4
)
D
22134-4 Wind Data
(
22117-4
)
F
22135-1 Com
p
ass Data
(
22117-5
)
GB
22135-2 Com
p
ass Data
(
22117-5
)
S
22135-3 Com
p
ass Data
(
22117-5
)
D
22135-4 Com
p
ass Data
(
22117-5
)
F
22136-1 GPS Navi
g
ator
(
22117-6
)
GB
22136-2 GPS Navi
g
ator
(
22117-6
)
S
22136-3 GPS Navi
g
ator
(
22117-6
)
D
22136-4 GPS Navi
g
ator
(
22117-6
)
F
22002-12 GPS Antenna
(
21970
)
GB
,
S
22002-34 GPS Antenna
(
21970
)
D
,
F
221
38
-1 Instrument Analo
g
ue
(
2217-
0
1 to 22117-1
3)
G
B
221
38
-2 Instrument Analo
g
ue
(
2217-
0
1 to 22117-1
3)
S
221
38
-
3
Instrument Analo
g
ue
(
2217-
0
1 to 22117-1
3)
D
221
38
-4 Instrument Analo
g
ue
(
2217-
0
1 to 22117-1
3)
F
Remote Control Instrument
(
21210-903
)
GB
Remote Control Instrument
(
21210-903
)
S
Remote Control Instrument
(
21210-903
)
D
Remote Control Instrument
(
21210-903
)
F

11RELDOCNX2.DOC Page 2 Latest update 9 December 2002
Multi XL
(
22308-1
)
GB
Multi XL
(
22308-1
)
S
Multi XL
(
22308-1
)
D
Multi XL
(
22308-1
)
F
User Manual
Art. No. Product & Product Art. No. Language
21646-1 Multi Center
(
21621
)
GB
21646-2 Multi Center
(
21621
)
S
21646-3 Multi Center
(
21621
)
D
21646-4 Multi Center
(
21621
)
F
67701-2 Pum
p
set PF-0.3 / S
(
21341+21341-24
)
GB
Pum
p
set PF-0.3 / S
(
21341+21341-24
)
S
Pum
p
set PF-0.3 / S
(
21341+21341-24
)
D
Pum
p
set PF-0.3 / S
(
21341+21341-24
)
F
67703-1 Linear Drive AN-23
(
21136
)
GB
Linear Drive AN-23
(
21136
)
S
Linear Drive AN-23
(
21136
)
D
Linear Drive AN-23
(
21136
)
F
67705-1 Linear Drive SP-20
(
21136-2
)
GB
Linear Drive SP-20
(
21136-2
)
S
Linear Drive SP-20
(
21136-2
)
D
Linear Drive SP-20
(
21136-2
)
F
67704-1 Inte
g
rated Drive HP-40
(
69991-12
)
GB
Inte
g
rated Drive HP-40
(
69991-12
)
S
Inte
g
rated Drive HP-40
(
69991-12
)
D
Inte
g
rated Drive HP-40
(
69991-12
)
F
Connection Box NX2/Nexus Bus
(
21456
)
GB
67705 Connection Box Wind/Com
p
ass Data
(
21453
)
GB
67706 MTC box
(
21721
)
GB
21730 Server Simulator
(
20592-2
)
GB
Mounting instructions
2
0
7
06
-1 Lo
g
/
Tem
p
transducer
(
2
0
7
0
7
)
G
B
2
0
7
06
-2 Lo
g
/
Tem
p
transducer
(
2
0
7
0
7
)
S
2
0
7
06
-
3
Lo
g
/
Tem
p
transducer
(
2
0
7
0
7
)
D
2
0
7
06
-4 Lo
g
/
Tem
p
transducer
(
2
0
7
0
7
)
F
2
0
72
8
-1 Wind transducer
(
2
0
721
)
G
B
2
0
72
8
-2 Wind transducer
(
2
0
721
)
S
2
0
72
8
-
3
Wind transducer
(
2
0
721
)
D
2
0
72
8
-4 Wind transducer
(
2
0
721
)
F
2
086
7-1
C
om
p
ass transducer 4
5
°
(
2
0860)
G
B
,
S,
D
,
F
217
5
1
C
om
p
ass transducer
35
°
(
217
3
1
)
G
B
,
S,
D
,
F
2
086
7-1
C
om
p
ass transducer
35
°
(
217
3
1
)
G
B
2
086
7-2
C
om
p
ass transducer
35
°
(
217
3
1
)
S
2
086
7-
3
C
om
p
ass transducer
35
°
(
217
3
1
)
D
2
086
7-4
C
om
p
ass transducer
35
°
(
217
3
1
)
F
Other
2
09
17 Warrant
y
C
ard
G
B
2
09
1
9
Re
p
resentative Marine El.

20-3SYSTNX2.DOC Page 1 Latest update: 27. Februar 2003
2. NX2/NEXUS NETWORK - BRIEF INTRODUCTION
For full information see Appendix A
For practical understanding see § 6 Server
The NX2/NEXUS Network is a high performance, non collision Multi talker Multi
receiver databus especially designed to be used for marine and navigational
applications.
The most important features are the high update rate, fast response times, very
low data latency (25 ms) and very high data security even at very long distances.
Another important feature is that Data transfer efficiency will not degrade even
when used in large and complex systems. It utilises the RS485 standard with up
to 32 senders and/or receivers to form a Local Area Network.
Data is transmitted asynchronously with 1 start-bit, 8-data-bits, 1 parity-bit, two
stop-bits in 9600 baud.
Start Stop
0 d7 d6 d5 d4 d3
d2d1 d0 P 1 1
2.1 PROTOCOL
All data is exchanged in PACKETS. There are two main types of PACKETS:
Data-Packets and New-Sender-Packets.
The Data-Packet consists of a ”header byte” followed by 1, up to max. 24 bytes of
data, ended with a checksum byte. The Data packets ”header byte” is identified by
having the parity bit = 1 and bit d7 = 0. The remaining 7 bits are identifying the
type of data that will follow (0-127). The bytes that follows the ”header byte” is the
usable data. There is no length-field included, but the receiver will know by the pre-
defined field length from the packet-ID (bit d6-d0 in the ”header byte”). The last byte
is the checksum, equals the XOR-summation of packet-ID and all data bytes.
The New-Sender-Packet consists of just one byte and has no checksum. When
this packet have been sent, the receiving unit switches over to transmit mode,
and the ”old” sender switches over to receiver mode. The sending rights have
been ”handed-over” to the New-Sender.
New-Sender-Packet format:
d7 d6 d5 d4 d3 d2 d1 d0 P
1 Sender ID 1
N.B. the parity bit is not used for error detection, just to identify the ”header byte”
and ”next sender ID” from the data.

20-3SYSTNX2.DOC Page 2 Latest update: 27. Februar 2003
2.2 NX2/NEXUS USER POLICY
The NX2/NEXUS network is open for new users/applications without the need of
a license or license fee.
Silva Sweden AB will support PC applications under DOS and WINDOWS™
when using the PC-Interface FD, art. no 21248. The PC-interface will convert the
NX2/NEXUS half-duplex data to Full-Duplex data suitable for WINDOWS™
applications.
The PC-interface comes with software and is supplied with a 9-pole D-sub
connector cable for the RS232 PC port. The PC interface will be a very useful tool
to control and monitor real time data, or when editing Waypoints to/from PC-file or
to/from NX2 GPS or Server.

23PROTYPNX2.DOC Page 1 Latest update: 27. Februar 2003
2.3 NX2/NEXUS PRODUCT TYPE WITH POSSIBLE
CATEGORIES
Product
There are basically 4 different Marine electronic product types, where some of the
product types also include NMEA 0183 input & output.
• NEXUS Network-Manager
• NEXUS Network-Repeater (talk & listen)
• NEXUS Network-Repeater (listen only)
• Standalone instruments with no NEXUS Network
Product Type
The most advanced type is the NEXUS Network-Manager, which is needed to
establish and operate a NEXUS Network. The Server will automatically be the
NEXUS Network-Manager when installed, but other units may be used as a
NEXUS Network-Manager. See further details in the NEXUS Network
specification, appendix A.
Possible Category
Each category represents one or more core functions given from a transducer
(i.e. wind- speed wind angle) or calculated by an instrument (GPS navigational
data). Only one category may be activated as a category master even if multiple
category instruments are available in the NEXUS Network.
Example 1: The Server may give away the Wind category to the Wind Data
instrument on request from the configuration set-up. It is therefore very important
to configure the Network so it corresponds to where the transducers or the
”category’s” are connected or used.
Example 2: Where two Wind Data instruments are installed, only one may be
set-up to be the Wind category master, the other must be set to Repeater mode.
Also, if the Server is missing, the Wind Data instrument with category Wind will
become the NEXUS Network Manager. For further information, read the NEXUS
Network specification, appendix A.

23PROTYPNX2.DOC Page 2 Latest update: 27. Februar 2003
Product Product Type Possible
Category/Masters
NX2 Server NEXUS Network-Manager *
NMEA 0183 input & output Log & temp, Depth, Compass,
Wind.
NX2 Wind Data and
Compass Data instruments NEXUS Network-Manager
or NEXUS Network Repeater
(talk & listen)
Wind and / or Log & temp
Compass and / or Log & temp
NX2 GPS Antenna.
New P/N 21970 NMEA 0183 output None
Nexus GPS Antenna.
Old P/N 21000 NEXUS Network-Manager Position
GPS Compass XL1000/ XL300 NEXUS Network-Manager (limited) Position
NX2 Autopilot Servo Unit NEXUS Network-Manager (limited) Autopilot, Compass
NX2 Multi Control, Speed Log and
Autopilot instruments NEXUS Network Repeater (talk & listen) None
NX2 Multi XL instrument NEXUS Network Repeater (talk & listen) None
NX2 Multi Center NEXUS Network Repeater (talk & listen)
or NMEA 0183 input & output Nav-Master incl. WP-bank or Nav-Repeater
NX2 Remote Control instrument NEXUS Network Repeater (talk & listen) None
NX2 GPS Navigator instrument NEXUS Network Repeater (talk & listen)
and NMEA 0183 input & output Nav-Master incl. WP-bank or Nav-Repeater
All NX2 Analog instruments Network Repeater (listen only) None
*) Can also be named ”Master” or ”Bus-Master” in some Silva Information material.
Stand alone products with no NX2/NEXUS Network!
NX2 standalone connected Speed
Log instrument
STAR Sea Data instrument No network possibility
STAR Nav Repeater instrument NMEA 0183 input

24StartInitNX2.DOC Page 1Latest update: 30 Jan -03
2.4 NETWORK START UP AND INITIALISATION
When the NX2 Network gets 12 V power on, the System will perform a Network
initialisation and a system and instrument self test. The display on all digital
instruments first show all segments, then the software version number and the
Nexus Network ID number.
At first power on after installation you will be asked to press any KEY (PrESkey).
This will give each instrument a logical ID number on the Nexus Network. This
(PrESkey) can also come up when a change has been done in the system.
To initialise the instrument, press SET on all installed digital instruments, one at
the time.
Note: Always wait for the text ”Init OK”
to be displayed, before you press SET
on the next instrument!
The Server automatically gives the first unit ID number 16, then 17 and so on.
The order in which you press SET is the same order as the instruments will be
given a logical ID number on the Nexus Network.
The example shows that the instrument version number is 2.0 and the given
logical ID number is 16.
The bottom line will write SILVA when the NX2 Multi Control is of version 3.7 or
lower, the same as for Nexus Classic.
On NX2 Multi Control >4.1, Multi XL >1.4 and Autopilot >2.11 Instruments the
bottom line will show the Server ver. no: e.g. 4.7 and the last smaller digit the ID
number of the Network Master/Manager e.g. 0=NX2 Server.
Where 0=Server, 3=AP Servo, 8=Compass Data, 9=Wind Data,
Re-initialising the instrument
If two instruments by mistake have the same ID number, this can cause
disturbance and block the information on the Nexus data bus.
To re-initialise the instrument, press CLEAR during the power up sequence
when version and ID numbers are displayed.
The display self test is then re-started on all instruments and you will be
asked to press KEY on each instrument as explained above.
Note! If you do not succeed to re-initialise, we suggest you disconnect all but
one instrument with the same ID number, then repeat the above procedure.
4.7 0

24StartInitNX2.DOC Page 2Latest update: 30 Jan -03
2.41 Locking the network for unauthorised change of set up
and calibration.
The Locking function gives the owner the possibility to prevent unauthorised users to enter the
Set up, Calibration or to move and select sub functions for the whole NX2 System.
To lock, long (2 sec.) on “Set” to enter Set up mode.
Press “Set” and “Page” simultaneously .
Enter the code324135 by+ and –button and press Set to lock.
To unlock, press “Set” and “Page” simultaneously while “LOCKEd” is displayed when entering
the Set up.
Then, enter the code324135 by+ and –button and press Set to unlock.
Note! To lock or unlock from the Wind Data or Compass Data “Set” has to be pressed after
entering three digits 324 and then again after 135 as well.
Note! GPS Navigator Instrument can not be used to lock or unlock.

30errorNX2.doc Page 1 Latest update: 18 Nov -02
3. NX2/NEXUS NETWORK ERROR MESSAGE WITH CAUSE
AND REMEDY
If an error message [Err #] is displayed on any instrument, an error has been
detected by NX2/NEXUS Network.
The message can assist you to diagnose the cause and remedy the error.
To escape from an error message, press any push-button. If not possible to escape,
reset power (turn off and on again), then make the remedy if suggested below.
Note! For errors marked with [*], most probably the unit needs a rectification.
Errors marked with [¤] is only relevant for old products, GPS Antenna
21000, and GPS Compass /XL1000.
No. Message and cause * Remedy
01 Activated watchdog timeout.
Stack error * Reset power.
02 NEXUS Network data frames are
missing. Check connections and set-up.
03 No data received within approx. 10 sec. Check connections and power voltages.
04 EEPROM read error. * Reset power.
05 EEPROM write error. * Reset power.
06 RAM memory Read-error. * Reset power.
07 Autolog full in GPS Compass. Clear Autolog memory.
08 Break reset. * Reset power.
09 EEPROM auto initalisation, or
NMEA transmit fail. (NX2/NEXUS
Server only).
* Reset power.
10 Range error, depending on wrong
input e.g. 17°70' = too many minutes. Correct input format.
11 Remote control calibration error.
Command can not be executed . Check connections and settings.
12 No response from navigator. Check navigator connection and settings.
13 Waypoint not defined. Define a waypoint.
14 Impossible command when used
with an external NMEA navigator. Use only possible command.
15 Impossible command when in
autopilot mode. Use only possible commands.
16 Auto-deviation is not possible.
NMEA Compass selected? Check for extreme magnetic field, upside down mounting of transducer or wrong
transducer type setting. NMEA Compass?
17 Auto-deviation check failed. 1¼ turn not completed or extreme magnetic
disturbance.
18 Auto-deviation. Function denied. Function denied since compass is busy with
the auto-deviation routine.
19 Auto-deviation failure. Error larger than 1.5°. The boat probably hit a
wave during the turn.
20 GPS to CPU communication error. *¤ Reset power.
21 GPS aqusitition failure (time out). ¤ Maximum allowed time for searching
satellites. E.g. when try to navigate indoors.
Check GPS antenna location.
22 CPU to GPS communication error. *¤ Reset power.

30errorNX2.doc Page 2 Latest update: 18 Nov -02
No. Message and cause * Remedy
23 DGPS (RTCM) data ignored. ¤ Change the DGPS (RTCM) setting.
24 GPS bad fix, no fix position (time
expired at one-fix). ¤ Check GPS antenna location.
25 No autopilot response. Object is not
connected. Check wiring connections and fuse.
26 The unit is not allowed to power up
because there is too high input
voltage.
* Check input voltage.
27 Extended object server busy or error. Set one GPS Navigator instrument to master.
28 Route command error. The
waypoint bank memory is full. Clear waypoint bank for new space.
29 DGPS mode is interrupted. ¤ Check the DGPS receiver.
30-
41 Reserved for NEXUS Autopilot Servo Unit. See NEXUS Autopilot manual.
42 Bad transducer input / bad
measurement. * Reset power.
Reserved for NEXUS Autopilot
Servo Unit.
30 General autopilot failure * Reset power.
31 Autopilot compass input failure in
autopilot standalone connection. Check compass connection at autopilot Servo Unit.
32 Autopilot compass input failure in
autopilot NEXUS Network connection. Check compass at NEXUS Server or at the Compass Data instrument
33 Received wind data input failure. Check wind wire connection.
34 Autopilot calibration failure. Check for air in the system and make APC
routine again in calm water at crousing speed.
35 Navigation data not available in
autopilot stand alone connection. Check NMEA input connections and settings in the navigator.
36 Navigation data not available in
autopilot NEXUS Network connection. Check connections and navigator settings.
37 Autopilot Network re-initialisation. Check connections, wire dimensions and
Battery charge and quality.
38 Autopilot Rudder transmitter failure * Check Rudder transmitter, connection and
wireing.
41 Failure to initialise EEPROM. * Reset power.

4REPLACENX2.doc Page 1 Latest update: 18 Nov -02
4 NX2 REPLACEMENT SYSTEM OF
DEFECT TRANSDUCER AND INSTRUMENT
The Silva NX2 System is designed and adapted to a replacement system of
Transducer and Instruments, giving the customer fast and accurate service.
The NX2 replacement system handled by Authorised Service Agents, mean that
the Service Agent stocks NX2 Transducer and Instruments for immediate
replacement.
4.1 REPAIR BY FAULTFINDING AND REPLACEMENT OF
DEFECT TRANSDUCER OR INSTRUMENT
If faultfinding according to §5 leads to the conclusion that any unit is defect it should
be replaced in accordance to SILVA NX2 replacement system if the unit is under
warranty. Wind, Compass and GPS transducers can be repaired.
If the unit is outside the warranty period the customer should be offered a restored
instrument.
4.2 RETURN OF FAULTY NX2 UNITS TO AGENT/SILVA
The SILVA NX2 exchange system is a replacement system handled by
Authorised Service Agents, mean that the Service Agent stocks NX2 Transducer
and Instruments for immediate replacement, giving the customer fast and accurate
service.
When returning NX2 Instruments to a Service Agent or Silva Sweden each unit
should be followed by a NX2 Return Form, filled in as complete as possible to
secure high quality on all NX2 products.
NX2 instruments followed by a complete Return Form will also pass the Silva
administration fast with quick handling and return shipment without any delay.

5FAULTFINDNX2.doc Page 1 Latest update: 24 Feb -03
5 NX2 FAULTFINDING AND TESTS ON BOARD
The Silva NX2 System can easily be tested on board a vessel. Always start by
confirming that the “Maintenance and fault finding” in the Operation Manuals has
been checked by the customer. Also be convinced that all system and calibration
settings are not causing the problems.
5.1 BLANC DISPLAY - POWER TEST
Check connection terminal at the back of the Instrument: Green(+) to Screen(-) you
should have 12 Volt (10-16 V), if not: check wires, fuse and battery. If the
Instrument do not run the starting up procedure in spit of 12V OK power, it has to be
replaced and sent to Silva for further tests.
5.2 NO OR WRONG VALUE ON NX2 INSTRUMENTS
Al transducer inputs on the NX2 Server are equipped with signal sensors indicating
incoming signals by blinking LED’s.
Log transducer will shift the LED on log input from on to off and vice versa for every
half turn on the impeller.
Depth LED will blink on every received Echo.
Compass LED’s will blink on each channel receiving signal, with constant frequency.
Wind LED’s will blink on each channel receiving signal, with a frequency related to
the actual wind speed.
If lack of signal indication on LED’s, check wires, connections and transducer.
5.3 ERR 03 – BUS COMMUNICATION TEST
Log sensor
Depth sensor
Wind sensors
Compass sensors

5FAULTFINDNX2.doc Page 2 Latest update: 24 Feb -03
If the instrument shows Err 03 it means brake in the communication (time out is
10 sec.).
Test 1: Check connection and signal at the 4-pole jack plug the back of the
Instrument: Between Yellow and White you should have ~4,3 Volt AC (varying).
If ~4,3V OK do test 2. If only ~1,8 V AC, check Yellow to Screen and White to
Screen, the one with 0 V is interrupted.
Check connections, wires, lose ends, mix white-yellow etc.
If no fault on the installation is found remove Yellow and White wires connected to
term. 6 and 7 on the Server, do Test 1 on the Server output terminal 6 and 7.
If not ~4,3 Volt AC (varying) there is a fault in the Server.
If the Instrument does not start in spit of correct signal level, do test 2.
Test 2: If possible, check the same 4-pole jack plug with another working Digital
NX2/Nexus instrument to see if there is a correct Bus-signal from the plug. If this
Instrument works well there is fault in the first instrument, and it has to be replaced
and sent to Silva for further tests.
5.4 ERR 02 – BUS COMMUNICATION TEST
If the instrument show Err 02 it means that there is ”some” signal on the Bus but it is
in-correct, disturbed or of wrong type, (e.g. NMEA). Check connections, Set-up
and that white-yellow wires isn’t mixed.
5.5 NO OR WRONG VALUE ON ANALOGUE INSTRUMENT
If an Analogue instrument connected to a working NX2 bus do not show relevant
value: Check Set-up, calibration, connections, wires, lose ends and that white-
yellow wires isn’t mixed.
If customer have claim on other function, please check to confirm.
5.6 NX2 FAULTFINDING GUIDE
Multi Center can be used to find reason to system faults, see 5.8
Function Display Cause Action Set-up/ Remedy
Start Blank Display No Power Check back of Instrument Green+12V,
Screen 0 V. See §5.1 Wires, Fuse, Battery
Err 03 No Bus signal Check back of Instrument Yellow-White
4.3 V AC. See §5.3 If no signal to Instrument check wires, connections,
Bus-signal out fr. Server
Err 03 No Bus signal Check back of Instrument Yellow-White
4.3 V AC. See §5.3 If signal to instrument, Fault is in Instrument. Replace
Err 02 Fault or disturbance in Bus
signal Check system and that Yellow-White wire isn’t reversed. See § 5.4 Correct wires. Remove spurious signal source
LCD segments
missing LCD segments missing Check if all segments are present during Start up. Fault in Instrument Replace
Speed/Depth/Wind/
Compass Wrong or No Speed/Depth/
Wind or Compass
No signal from transducer? Check signal indicators on server. see
§5.2 If No signal check wires connections and
transducer
Speed/Depth/Wind/
Compass Wrong or No Speed/Depth/
Wind or Compass
Check settings per below
check list. Correct settings! Correct settings!
Analogue
Instrument value Wrong or No value on Analogue Instru Connections, wires, calibration, Set-up Check accordingly, see § 5.5 If fault in Instrument Replace
Instrument Light Not all turn ON. Same ID-No on two
Instruments Make a Re-Initialisation so that every Instrument get its own ID-No.
BTW no values No waypoint selected Select way point
Calibration Not available/
Can’t be changed Same ID-No on two Instruments Make a Re-Initialisation so that every Instrument get its own ID-No.
Function Display Cause Action Set-up
Compass no heading [- - -] Wrong setting of COG: COG
set to ON but no navigator
connected
Set COG to OFF C94
Compass no values [- - -] Nexus com
p
ass transducer Set C75 to OFF C75

5FAULTFINDNX2.doc Page 3 Latest update: 24 Feb -03
and C75 set to ON
Compass no values [- - -] NMEA compass transducer
and C75 set to OFF Set C75 to ON C75
Compass wrong COG-
values Incorrect setting of damping Correct setting of damping C72
Compass wrong values Incorrect setting of magnetic
variation Correct setting of magnetic variation C33
Compass wrong values Auto deviation not performed Run the Auto deviation C34
Compass wrong values Auto deviation not successful Check Auto deviation Run the Auto
deviation C34, C35
Compass wrong values Incorrect setting of compass
transducer misalignment Correct setting of compass transducer misalignment C37
Compass wrong values Wrong selection of
magnetic/true Correct setting C40
Compass wrong values Wrong mounting of the
transducer Check that transducer is not mounted upside down. Mount correct
Compass wrong values Magnetic disturbance Check that there are no ferrurinous
items close to the transducer.
Compass wrong values Incorrect setting of damping Correct setting of damping Sub-function NAV-page
Compass no values [- - -]
Compass Data C71 incorrect set to [ON] (Compass Data) Correct setting to [OFF] C71 in Compass Data
Compass Compass func-
tion not available
in Multi Control
Incorrect setting of Page Auto
C31 Set C31 to PAGE ATO or PAGE ON C31
Depth wrong values Wrong units Correct setting of units C21
Depth wrong values Incorrect calibration of the
depth transducer position Correct calibration of the depth transducer position C22
Depth no values [- - -] Deep water outside the range
of the transducer
Depth no values [- - -] Deep water and soft bottom
Depth no values [- - -] The boat is heeling heavily
Depth no values [- - -] In propeller stream, where air
bubbles are created
Depth wrong values In propeller stream, where air
bubbles are created
Depth no values [- - -] Poor connection or reversed
connectors at the amplifier box Check connections
Depth no values [- - -] Internal mount: poor signal
penetration due to thick hull Use through hull fitting
Depth no values [- - -] Internal mount: air between
transducer and hull re-install the transducer
Depth wrong values Going over shallow water, with
uneven and high bottom
vegetation
Depth wrong values Heavy layers of salt or
noticeable ranges of water
temperature
Depth wrong values Heavily agitated water
containing particles of sand or
some other contamination
Depth wrong values at
anchor in harbour Disturbances from other depth transducers
Depth wrong values (in
harbour/at anchor) Disturbances from chains or mooring equipment
DTW no values No waypoint selected Select waypoint
MEM setting Not possible.
Err 02 Same ID-No on two Instruments Make a Re-Initialisation so that every Instrument get its own ID-No.
Multi Center Loading Waypoint
Please be patient Same ID-No on two Instruments Make a Re-Initialisation so that every Instrument get its own ID-No.
Display Blanc or
Black Contrast to low or to high Contrast can be adjusted during start up. Push cursor button up or down.
Multi Center Err 03 Check connections i.e. on connector
back of MCe
Multi Center Can not pass
Warning text page Check wires on MCe – wires with open ends have to be isolated.
Multi Center Course line
poins only North. Seting of Course Line not correct Set Course Line to COG for GPS and HDC for Compass transducer.
Function Display Cause Action Set-up
NMEA out no values on
NMEA-unit Incorrect selection of NMEA out sentences Select desired NMEA sentences C77 to C93
NMEA out wrong / no values Poor NMEA-out connection Check connections
NMEA out no values on
NMEA-unit No NMEA output Check NMEA output, see §5.7 If no NMEA output replace Server
NMEA in wrong / no
values Poor NMEA-in connection Check connections

5FAULTFINDNX2.doc Page 4 Latest update: 24 Feb -03
NMEA in No values Wrong NMEA sentences
transmitted Check set-up in the transmitting unit
Position no values Incorrect selection of position
source Correct selection of position source Config Nexus / NMEA position in GPS Navigator
Position wrong values Incorrect setting of
minutes/seconds, C38 Correct setting of C38 C38
Push button No sound Wrong setting of C71=OFF
Set to C71= ON C71/Set C71 = ON
Push button No sound If correct setting of C71
Fault in Instrument Fault in Instrument Replace
REM
Remote Control Two Instruments react on comands Same ID-No on two Instruments Make a Re-Initialisation so that every Instrument get its own ID-No.
Speed no speed [- - -] Wrong setting of SOG, set to
ON but no navigator
connected
Set SOG to OFF C95/ Set C95 = OFF
(SOG)
Speed Speed value is
0.00 Impeller is not rotating? take up the transducer and turn the impeller. Log diode should blink and
speed value on instrument.
Blinking diod indicate OK
Log transducer.
Speed no speed [0.00] Impeller is not rotating Clean the impeller
Speed no speed [0.00] Impeller is not rotating, due to
remaining antifouling inside
the through hull fitting
Clean the through-hull fitting
Speed wrong values Wrong units Correct setting of units C11
Speed wrong values Incorrect calibration value Correct calibration C12
Speed wrong values Incorrect setting of damping Correct setting of damping C13
Speed wrong SOG-
values Incorrect setting of damping Correct setting of damping C72
Temperature No Temp. (- - -) Connections, wires, lose end Correct connect. Check. White to ground ~1,8 V White to ground
Temperature Wrong Temp.
value Incorrect calibration value Correct calibration C23, C24
Wind no values [- - -] Nexus wind transducer but
C76 set to ON Set C76 to OFF C76
Wind no values [- - -] NMEA wind transducer and
C76 set to OFF Set C76 to ON C76
Wind wrong speed
values Wrong units Correct setting of units C53
Wind wrong wind
angle Wrong selection of wind angle Correct selection of wind angle C52
Wind wrong wind
angle Incorrect setting of mast top unit misalignment Correct setting of mast top unit misalignment C55
Wind wrong wind
angle Incorrect setting of wind calibration values Correct setting of wind calibration values C56 to C63
Wind wrong values Poor cable connection Check connections wind transducer /
cable through deck connectors
Wind wrong values Incorrect setting of damping Correct setting of damping C65
Wind no values [- - -]
Wind Data C71 incorrect set to [ON] (Wind Data) Correct setting to [OFF] C71 Wind Data
Wind Wind function
not available in
Multi Control
Incorrect setting of Page Auto
C51 Set C51 to PAGE ATO or PAGE ON C51