Kongsberg Simrad ST90, Reference Manual

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• Do not step on the transducer cables.
• Do not damage the transducer cables. Avoid exposure to sharp objects.
Procedure
1 Make sure that all power to the hull unit is disconnected.
2 Make sure that you have sufficient height between the hull and the dry dock floor.
3 Lowering the transducer
a Use a spanner to open the door on the Motor Control Unit.
WARNING
High voltages are used. This equipment must be serviced only by qualified
personnel familiar with high-voltage equipment and the potential hazards
involved. Failure to observe this precaution could result in bodily injury.
You may be exposed to electric shock. Read and understand the applicable
first aid instructions related to electric shock.
b Locate the
Motor Protecting Switch
(S301).
c Deactivate the
Motor Protecting Switch
(S301) by pressing the operating handle
to OFF .
d Locate the hand crank inside the Motor Control Unit.
e Remove the hand crank from its storage position.
f Remove the plastic plug on the top cover of the hull unit.
g Mount the hand crank onto the stub shaft through the hole in the top cover.
h Locate the brake release screw on the motor.
i Use an 4 mm Allen key to rotate the screw clockwise until the motor brake is
released.
j Turn the crank until the transducer is fully lowered.
4 Allow for sufficient access to clean and inspect the entire surface of the transducer.
5 Remove biological fouling carefully using a plastic brush, a suitable synthetic detergent
and fresh water.
Biological material which is strongly rooted in the substrate can be removed carefully
with a piece of wood or plastic. If required, you can also use citric acid. Apply, leave it
working for several hours, and rinse thoroughly with fresh water.
Be careful so that you do not accidentally make cuts or inflict other physical damage to
the transducer face.
Maintenance procedures