Furuno FR-8251 Manual De Usuario
3-2
3.1 Periodic Maintenance Schedule
Interval
Check point
Check measures
Remarks
Weekly
Display unit
Periodically clean the exterior of
display unit using dry soft clean. Use
display unit using dry soft clean. Use
of commercially available CRT cleaner
(spray) having antistatic effect is
(spray) having antistatic effect is
recommended.
CRT screen produces static charge
which would attract dust. DO NOT
which would attract dust. DO NOT
use strong solvent like paint thinner
or abrasive cleaners for cleaning.
or abrasive cleaners for cleaning.
Dust and dirt on CRT creates
symptoms similar to poor sensitivity.
symptoms similar to poor sensitivity.
Exposed nuts
and bolts on
and bolts on
antenna unit
Check for corroded or loosened nuts
and bolts, If necessary, clean and
and bolts, If necessary, clean and
repaint them thickly. Replace them if
heavily corroded.
heavily corroded.
Sealing compound may be used-
Instead of paint. Apply a small
Instead of paint. Apply a small
amount of grease between nuts and
bolts for easy removal in future.
bolts for easy removal in future.
Antenna radiator
Check for dirt and cracks on radiator
surface. Thick dirt should be wiped off
surface. Thick dirt should be wiped off
with soft cloth dampened with fresh
water. If a crack is found, apply a
water. If a crack is found, apply a
slight amount of sealing compound or
adhesive as a temporary remedy, then
adhesive as a temporary remedy, then
call for repair.
Do not use plastic solvent (acetone)
for cleaning. If you need to remove
for cleaning. If you need to remove
ice from antenna unit, use a wooden
hammer or plastic. Crack on the unit
hammer or plastic. Crack on the unit
may cause water ingress, causing
serious damages to internal circuits.
serious damages to internal circuits.
3 to 6
months
months
Terminal strips
and plugs in
and plugs in
antenna unit
Open antenna cover to check terminal
strip and plug connections inside. Also
strip and plug connections inside. Also
check the rubber gasket of antenna
covers for deterioration.
covers for deterioration.
When closing antenna covers in
position, be careful not to catch loose
position, be careful not to catch loose
wires between covers and unit.
CRT and
surrounding
surrounding
components
High voltage at CRT and surrounding
components attract dust in
components attract dust in
environment which will cause poor
insulation. Ask your nearest FURUNO
insulation. Ask your nearest FURUNO
representative or dealer to clean
internal high-voltage components.
internal high-voltage components.
If CRT anode rubber cap or wire
sheath is cracked, ask your dealer to
sheath is cracked, ask your dealer to
replace it. Wait for at least 3 minutes
until high voltage components (CRT
until high voltage components (CRT
and HV capacitors) discharge their
residual charges before accessing
residual charges before accessing
them.
6 months
to one
to one
year
Terminal strips,
sockets, earth
terminal
terminal
Check for loose connections. Check
contacts and plugs for proper seating,
etc.
etc.
3.2
Life Expectancy of Major Parts
Parts
Type
Life expectancy
Remarks
Antenna motor
D8G-516 (24 rpm)
D8G-570 (36 rpm)
Gear more than 10,000
hours
Wind load 100 knots
Magnetron
MAF1422B (6kW)
MAF1425B (10kW)
MAF1425B (10kW)
9M752/M5187F (25kW)
2,000-3,000 hours