Raymarine ST40 Owner's Handbook Manual page 20

Chapter 2: Maintenance and Fault Finding
Display blank
D D D D D epth reading
flashes when
under way
No depth information
ST40 BIDATA
ST40
Action
Ensure that reading stabilises when clear of disturbed water,
e.g. boat wakes, propeller wash etc.
ST40
1 minute
ST40
Action
Check the condition of the depth transducer cable and the
security of the connections.
Could also be due to weed growing on the transducer face.
Action
Check fuse/circuit breaker.
Check power supply.
Check SeaTalk cabling and
D4738-2
connector security.
OR
BIDATA
OR
BIDATA
BIDATA
ST40 BIDATA
ST40 BIDATA
1 minute
ST40 BIDATA
11
D4739-2
D4740-2