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Configure the navigatorʼs
Aux Port for the 491. See
the "Initial checkout"
section of this manual.
1. Check fuses and circuit
breakers.
2. Check power to 491 with
a voltmeter.
3. Verify that the data cable
between the navigator and
the 491 is properly wired
and connected.
The 491 and the navigator
aren't communicating properly.
Check the wiring of the data
cable between the navigator
and the 491.
491 INSTALLATION MANUAL Revision A
No echoes displayed on sounder screen.
NO
OFF
FLASHING
GREEN
Figure 13: 957/958/6000i echo sounder system troubleshooting
SECTION FOUR — Troubleshooting and servicing the
Is the
Advance
YES
Speed set to
zero?
NO
Has the
navigatorʼs
Aux Port been
configured
for the
491?
YES
STEADY
Check
GREEN
the 491's STAT
indicator
RED
Change the Advance Speed
setting.
491 is communicating with
the navigator.
1. Check transducer
connector for the
proper wiring.
2. If wiring is correct,check
transducer impedance
with an ohmmeter.
3. If the transducer is open
or shorted, replace it
There's a hardware problem
with the 491.
PAGE 23
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