Furuno FR-8122 EU - Manual (Page 104)

6. MAINTENANCE & TROUBLESHOOTING
6-5
6.6 Simple Troubleshooting
This section provides simple troubleshooting procedures which the user can follow to restore
normal operation. If you cannot restore normal operation do not attempt to check inside the unit.
Any trouble should be referred to a qualified technician.
Simple troubleshooting
If... But... Then...
you cannot turn on
the power • check for blown fuse.
• check that the power connector is firmly
fastened.
• check for corrosion on the power cable
connector.
• check for damaged power cable.
• check battery for proper voltage output
(10.8-31.2 V).
there is no response
when a key is
pressed turn off and on the power. If there still is no
response the key may be faulty. Contact your
dealer for advice.
if the power is on and
you operated the
STBY/TX key to
transmit nothing appears on the
display check that the antenna cable is firmly fastened.
marks and legends
appears no echo appears check that the antenna cable is firmly fastened.
tuning is properly
adjusted sensitivity is poor the magnetron may need to be replaced.
Contact your dealer.
the range is changed but radar picture does not
change
• try to hit the RANGE key again.
• turn the display unit off and on.
Poor discrimination
in range Try to adjust A/C SEA control.
the true motion
presentation is not
working properly • reselect the true motion mode.
• check if heading and speed are input.
the range rings are
not displayed check that the setting of Range Rings Brill in the
Brill/Color sub menu is set to other than Off.