Maintenance; Simple Troubleshooting - Furuno FM-8900S Operator's Manual

7. MAINTENANCE & TROUBLESHOOTING
7.2

Maintenance

Regular maintenance helps to keep your equipment in good condition and prevents
future problems. Check the items shown in the table below.
Item
Antenna Check for physical damage and corrosion.
Transceiver • Check ground connection.
unit • Check connection at signal cable, coaxial
cable, control cable, power cable and ex-
ternal equipment (including navigator).
• Confirm that there are no objects on the
top of the transceiver unit.
• Remove dust from transceiver unit with
soft cloth.
Note: Do not use chemical cleaners to
clean the transceiver unit; they can remove
paint or markings and deform the equip-
ment.
Power Check that the supply voltage at transmis-
supply sion is within the rated range (21.6 to 31.2
VDC at the power connector).
Power fuse Check if a power fuse (7A) has blown.
7.3

Simple Troubleshooting

The table below provides possible problems and the means with which to restore nor-
mal operation. If normal operation cannot be restored, do not attempt to check inside
the equipment. Any servicing should be referred to a qualified technician.
Problem
Power cannot be
turned on.
Display indications
do not appear.
Power is on but no
sound from the main
speaker.
Output power re-
duced to LOW
7-2
Check point
Probable cause
• Mains switchboard is off.
• (DC) voltage is too high or too low.
• Battery has discharged, or poor
contact at terminals.
Display brilliance is too low.
Main speaker is off.
Power is automatically reduced to pro-
tect against overheating due to contin-
uous transmission.
Remedy/Remarks
Replace damaged parts.
• Tighten the loosened connections;
remove foreign materials from con-
nectors.
• Remove any objects.
• 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 dis-
solve the dirt or salt. Change paper
frequently so the salt or dirt does not
scratch the LCD.
If not within the range, check power
source. Low voltage may cause erratic
operation.
If the fuse has blown, find out the cause
before replacing it (Type: FGBO 125V
7A PBF). If it blows after replacement,
contact your dealer.
Remedy
• Turn on the mains switchboard.
• Check supply voltage.
• Recharge the battery and tighten
the battery terminals.
Press the BRILL key to adjust the
display brilliance.
Press the key to turn on the main
speaker.
Wait until the unit cools.