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SECTION FOUR Troubleshooting and servicing the 490
Contact Northstar Service to
upgrade to the latest version
of 961/962 software.
Configure NMEA Port 3 for
the 490. See the 490
Operations Manual (GM490)
for instructions.
1. Check fuses and circuit
breakers
2. Check power to 490 with
a voltmeter.
3. Verify that the data cable
between the 961/962 and
the 490 is properly wired
and connected.
The 490 and the 961/962
aren't communicating properly.
Check the wiring of the data
cable between the 961/962
and the 490.
Page 24
No echoes displayed when STAR key is pressed.
Is the
Advance
Speed set to
zero?
NO
Is the
961/962
NO
software
Version 3.0 or
greater?
YES
Has
NMEA Port 3
NO
been configured
for the 490?
YES
Check
OFF
the 490's STAT
indicator
FLASHING
ONCE
What
PER
is the flash
SECOND
rate of the STAT
indicator?
Figure 11: 961/962 echo sounder system troubleshooting
Change the Advance Speed
YES
setting.
1. Check transducer
connector for the
STEADY
proper wiring.
ON
2. If wiring is correct,check
transducer impedance
with an ohmmeter.
3. If the transducer is open
or shorted, replace it
FOUR
TIMES
PER
SECOND
There's a hardware problem
with the 490.
490 INSTALLATION MANUAL, Revision B2
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