AUTOHELM ST 50 plus - Troubleshooting and Maintenance; Fault Finding Guide

Chapter 2 : Fault Finding and Maintenance
2 .1 Fault Finding
All Autohelm products are, prior to packing and shipping, subjected to
comprehensive test and quality assurance programmes .
However, if a
fault arises with the ST50 Plus GPS/Navdata, the
following table will help
to identify the probable cause and
provide the most likely cure .
Fault Cause
Action
Instrument display
blank .
No supply . Check supply .
Check cabling
and
security of
SeaTalk
connectors .
Check fuse/breaker .
Return unit for repair .
Instrument displays
'CODELOCK set',
ENTER CODE
The 'Code Lock'
feature
has been set .
Enter correct code
number .
No navigation
information .
Loss off information
from position
transducer .
Check transducer
signal status .
Check
cabling between
transducer and
GPS/Navdata or
N a v ce nter
No exchange of
information between
SeaTalk instruments .
SeaTalk cabling
problem .
Check security of
SeaTalk
connectors
.
Disconnect instruments
one by one to isolate
faulty unit .
Failure of a group of
instruments in SeaTalk
chain .
SeaTalk
cabling/connector
problem .
Check security
of
SeaTalk connectors
and non-functioning
units .