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13. MAINTENANCE,
TROUBLESHOOTING
This chapter contains maintenance and troubleshooting instructions to help you keep
optimum performance and the longest possible life of the equipment. Before attempt-
ing any maintenance or troubleshooting procedure, please review the safety informa-
tion below. If you cannot restore normal operation after following the troubleshooting
procedures, do not attempt to check inside any unit; there are no operator-serviceable
parts inside. Refer any repair work to a qualified technician.
WARNING
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Only qualified personnel are
allowed to work inside the
equipment.
13.1
Maintenance
Check the items shown in the table below regularly to prevent unnecessary trouble.
Check item
Check point
Display unit
Dust or dirt on the dis-
play
Antenna unit Loosened and corroded
bolts
Antenna
Connection point water-
cable
tightness
Connector tightness
and corrosion
Cable damage
Display unit
Connector tightness
connectors
Ground
Connection tightness
terminal
and corrosion
Transducer
Transducer face clean-
liness
Do not apply paint, anti-corrosive
sealant or contact spray to coating or
plastic parts.
Those items contain organic solvents that
can damage coating and plastic parts,
especially plastic connectors.
Wipe it carefully to prevent scratching. For difficult to re-
move dirt or salt deposits, use a cloth made wet with water
and neutral detergent (less than 1% detergent). Squeeze
the cloth dry then clean the display. When the display is
clean, gently wipe the display with a clean, soft, dry cloth,
to prevent scratching.
Tighten loosened bolts. Replace heavily corroded bolts.
Replaced damaged parts.
Re-tighten if necessary.
Replaced if corroded.
Marine life on the transducer face can reduce sensitivity.
Check the transducer for marine life when the boat is put in
drydock. Use a piece of wood to remove any marine life.
NOTICE
Remedy
13-1
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Table of Contents
Troubleshooting
