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SECTION ONE — Introduction
PAGE 2 491 INSTALLATION MANUAL Revision A
•
connecting the 491 to a transducer (see also the
Transducer Connec-
tor Instructions
—GM492)
•
troubleshooting and testing the system
•
technical specifications for the 491
For information about obtaining technical support and returning the 491
for factory service,
“SECTION FOUR — Troubleshooting and servicing the
491”
beginning on page 21.
For details about operating the 491, see the
Northstar 491 Echo Sounder
Operations Manual
(GM494) or Northstar 6000i’s Reference Manual, for
that product.
Installation
considerations
1. Check the shipping carton for any damage, and immediately report
any damage to the carrier. Save all packing material in case you have
to return the 491 to the factory for repair or evaluation.
2. Unpack the carton, and check its contents. You should have
received:
•
the Northstar 491 Echo Sounder
•
10-foot (3-meter) data cable to connect the 491 to the navigator
•
10-foot (3-meter) power cable for the 491
•
491 parts kit (containing transducer cable end connector, back-
shell, heatshrink tubing, and the
Transducer Connector Instruc-
tions
—GM492)
•
Northstar 491 Echo Sounder Installation Manual
(GM495)
•
Northstar 491 Echo Sounder Operations Manual
(GM494)
•
owner registration card
3. Fill out the owner registration card and mail it to Northstar.
4. Review all of the installation requirements as outlined in Sections
Two and Three.
5. Install the transducer, then terminate the cable (see ”Connecting the
491 to a transducer” starting on page 18).
6. Mount the 491. For instructions, see ”Mounting the 491” beginning
on page 14.
7. Connect the 491 to ship’s power and to the navigator. Connection
information begins on page 15.
With the vessel in the water, turn on the system and verify proper opera-
tion.
CAUTION!
The following list of installation considerations isn’t
a substitute for all the details in Section Three. To
ensure that you meet all critical installation parame-
ters, be sure to read that entire section and follow
all of its recommendations.