Raymarine ST40 Owner's Handbook Manual page 18

Chapter 2: Maintenance and Fault Finding
Low battery
Display blank
No heading
information
SeaTalk
information
not being
transferred
between
instruments
D4755-2
ST40 COMPASS
ST40 COMPASS
For example,
backlighting level
changes implemented at
one instrument do not
affect other instruments
Action
Recharge your vessel's battery as
soon as possible
Action
Check fuse/circuit breaker.
Check power supply.
Check SeaTalk cabling and
D4777-2
connector security.
Action
Check the condition of the fluxgate
compass transducer cable and the
security of the connections.
D4778-2
Action
Check security of SeaTalk
connections between instruments.
Check condition of SeaTalk cables.
Isolate faulty instrument by
disconnecting instruments one by one.
9