User guide

FS 20/25 Operators Manual 901-10037001/1.1
Maintenance and Troubleshooting Page 5.2
3
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
5.5.3.4 Housing Units (Heads, Sensor Modules and Egg Receivers)
The previous sections dealt with problems that would be considered hard failures.
The following section will discuss problems that appear more as erratic behavior and
intermittent faults.
Problem Action/Possible Cause
• Vertical Head Erratic Movement
-Fails Quadrant Calibration
• Remove Diaphragm Cover on Head
• If diaphragm bulging out, salt
water contamination in motor end
• Send head ashore for repair
• There will also be error message
codes that indicate this problem
• Vertical Head Erratic Behavior
-Stops, starts, error messages, but
will continue working
• Indicates problem with telemetry up
and down 3
rd
wire OR connectors
• Close inspection of 2-pin connector
and female inserts of 38” whip from
FS925 and Vertical 2-pin connector
• Ensure that no corrosion or
“burning” has taken place on
connectors (part of routine
maintenance)
• If connectors starting to degrade,
send unit(s) ashore for repair
• FS925 Erratic Behavior • Same logic with respect to connector
(2-pin to 3
rd
wire)
• Salt water contamination not an
issue (dome is a sealed unit)
• Both Heads Erratic Behavior • Error Messages will indicate both ID
256 and ID 512 error codes;
telemetry problems with both heads
• Observe cable gain numbers for
both (higher than normal?)
• Run full deployment package on
the Test Cable
• If problems not present using test
cable, do a thorough check on all
parts of the 3
rd
wire (including slip
rings)
• Sonar head operates but image
skewed or distorted
• Check calibration for errors in sonar
heads positioning (quadrant failure)
• If errors, then problem with sonar
head, otherwise check that sonar