User Manual
MAINTENANCE 
20221081 / F  45 
5.3  Repairs and modifications 
Repair of the HS50 units is limited to replacement of damaged 
cables, Sensor unit, Processing unit, or Display unit. 
Replacing damaged cables 
Power off the Processing unit and dismount the damaged cable. 
If the connector is not damaged it may be re-used, else a new 
connector has to be made available. 
Assemble the connector to the new cable as described in the 
wiring information for the damaged cable. Refer the 
INSTALLATION section, page 9 onwards. 
Terminate the cable to the Processing unit as described in Cable 
connections, page 19. 
Replacing damaged units 
No HS50 units are designed for service in the field, and a 
damaged unit has to be shipped back to Simrad for repair. 
Caution!  Opening the Sensor unit housing may result in permanent 
damage to the unit! 
Install the new unit according to procedures described in the 
INSTALLATION section, page 9 onwards. 
5.4  Troubleshooting 
A GPS compass is a complex system and performance is 
dependent of a proper installation and a successful sea trial. 
In case of a failure, the user will be helped by the Display unit, 
which contains several test features that will assist you in 
isolating a probable fault. 
Pressing any button resets the audible alarm. The visual alarm 
will remain and alternate with the operating display until the 
fault has been rectified. Refer to the table below for hints and try 
to solve the problem yourself, or consult your nearest Simrad 
dealer for assistance. 
The next sections contain some hints for troubleshooting. 










