Easy Troubleshooting - Furuno FAR21x7 & BB FAR28x7 Operator's Manual BB FAR28x7 Operator's Manual

6.6

Easy Troubleshooting

This paragraph provides troubleshooting procedures which the user may follow
to restore normal operation. If you cannot restore normal operation, do not
attempt to check inside any unit. Any repair work is best left to a qualified
technician.
Problem
Key beep inaudible
Picture not updated or
picture freeze-up
Marks, indications and
noise appear but no
echo
Range changed but
radar picture does not
change
Only 2 parallel index
lines when 6 lines are
wanted
Range rings are not
displayed
ARP target not
tracked correctly
Tuning adjusted but
poor sensitivity
Easy troubleshooting procedures
Cause
Key beep turned off Adjust key beep level on the OPERATION menu,
Video freeze-up
Blown fuse
Defective range key
or video freeze up
Incorrect setting of
index line intervals
Range rings turned
off
Poor definition of
targets in sea clutter
nd
2 trace echo
rejector on or dirt on
radiator face
6. MAINTENANCE, TROUBLESHOOTING
Remedy
referring to paragraph 1.42.
Turn the power off and on again to restore normal
operation.
Check for blown fuse in processor unit.
Try to hit RANGE [+] and [-] range keys (or
RANGE box) several times. (If unsuccessful,
replacement of keypad may be required in case of
the keyboard-type control unit.) If that does not
work try to turn the power off and on again to see
if the problem might be video freeze up.
Incorrect setting of index line intervals. Adjust
index line interval, referring to paragraph 1.29.2.
Also, the setting for number of index of lines to
display may be inappropriate. Check the menu
setting for number of index lines, referring to
paragraph 1.29.4.
Try turning on the range rings with 0 RINGS in the
MARK menu. If they do not appear, their brilliance
may be too low. Adjust their brilliance at page 1 of
the BRILL menu.
Adjust A/C SEA and A/C RAIN referring to
paragraph 1.17 and 1.18.
• Turn off the 2 nd
trace echo rejector, referring to
paragraph 1.37.
• Clean the radiator face.
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