Raymarine ST40 Speed Owner's Handbook Manual page 15

Chapter 2: Maintenance and Fault Finding
Low battery
Display blank
No speed or
water
temperature
information
No speed
information
but water
temperature
information is
present
SPEED
ST40
SPEED
D4639-2
ST40
ST40
ST40
ST40
Action
Recharge your vessel's battery as
soon as possible
D4638-1
Action
Check fuse/circuit breaker.
Check power supply.
Check SeaTalk cabling and
connector security.
Action
Check the condition of the transducer
cable and the security of the
connections.
SPEED
SPEED
D4640-2
Action
Transducer paddle wheel may be
fouled.
CAUTION
SPEED
If you need to remove the transducer
insert, have the transducer bung to
hand and secure it in the transducer
body immediately after the insert
has been removed, to prevent
SPEED
D4641-2
excessive ingress of water.
Clean the paddle wheel.
7