Furuno 1933C - Manual (Page 219)

7-1
7. MAINTENANCE,
TROUBLESHOOTING
This chapter provides information necessary for keeping your unit in good
working order and remedying simple problems.
WARNING
Do not open the equipment.
Hazardous voltage which can
cause electrical shock exists
inside the equipment. Only
qualified personnel should
work inside the equipment.
7.1 Preventive Maintenance
Regular maintenance is important for optimum performance. A maintenance
program should be established and should at least include the items shown in
the table below.
Maintenance program
Item Check point Remedy
Display unit
connectors Check for tight connection. Tighten loosened connectors.
LCD The LCD will, in time,
accumulate a coating of
dust which tends to dim
the picture. Wipe LCD
lightly with soft cloth to
remove dust.
Wipe the LCD carefully to prevent scratching,
using tissue paper and an LCD cleaner. To
remove dirt or salt deposits, use an LCD
cleaner, wiping slowly with tissue paper so as
to dissolve the dirt or salt. Change paper
frequently so the salt or dirt will not scratch
the LCD. Do not use solvents such as thinner,
acetone or benzene for cleaning.
Ground
terminal Check for tight connection
and corrosion. Clean or replace ground wire as
necessary.
7.2 Replacement of Battery
A lithium battery (Type CR2450-F2 ST2L, Code No. 000-144-941) fitted on a
circuit board inside the display unit preserves data when the equipment is turned
off, and its life is about three years. When its voltage is low the battery icon (
)
appears at the top of the display. When the icon appears, contact your dealer to
request replacement of the battery.