Unit installation

Troubleshooting and Maintenance
974-24007001/4.1 85
Sonar head operates correctly but the
cable gain is higher than normal and
telemetry errors may be present.
Problem may be with the sonar head or the
TTM interface unit.
Replace sonar head and repeat the test. If
problem re-occur then the problem is with
the TTM/LF1 otherwise the problem is in the
previous sonar head.
No sensor module data.
Internal sensor module electronics is
defective.
No catch indication but Depth and
Temp are OK.
Ensure catch sensors are properly charged
and display of catch data is enabled.
Check unit on deck with catch sensor placed
1 meter from receive transducer. Connect
wire from “+” lug to metal lid on back of
catch sensor, wait a couple minutes and
verify display. If no indication or indication
is wrong, then fault is with the internal
sensor module.
NOTE: If the FS unit is diagnosed as being faulty, then the
unit(s) should be returned to an authorized Simrad service
centre. ALL system performance results and a complete
description of the problem should be supplied with the defective
unit to assist in its repair.
5.5 Catch sensors
Refer to your SIMRAD FA or PI Sensor Operator and Service
Manual.
5.6 Winch slip-rings and trawl cable
Refer to your Manufacturer Operator and Installation Manual.