Furuno CH-37 - Manual (Page 83)

7-9
7.8 Troubleshooting Table
The table below provides common symptoms of equipment
troubles and the means to rectify them. If normal operation
cannot be restored, do not check inside the system. Any repair
work is best left to a qualified technician.
Check Symptom
No picture Power supply.
Check ship’s mains voltage at the
power plug connected to the power
unit.
Fuse.
If blown, replace with 10A fuse. Call
service technician if it blows again.
NEVER use a fuse of a higher rating.
Bottom echo becomes
irregular Rough seas.
Distance to sea bottom changes due
to rolling and pitching.
Long range selected.
Since transmission period is a little
longer, ship’s rolling and pitching are
apt to effect detection of echo.
Weak echo TX OUTPUT POWER set to other than
"C."
Check the TX OUTPUT POWER
setting on the SONAR menu, and
set it to "C" for max. output power.
TVG effect is excessive.
Excessive TVG results in elimination
of useful echoes.
Note: Readjustment of TVG is
required whenever the GAIN
control is adjusted.
Somewhat strange color BRILL control set too low.
Increase the brightness.
MENU : SONAR BOTTOM/3D E/S
TX RATE : 10
TX PULSE LENGTH : LONG SHORT
TX OUTPUT POWER : A B C (MAX)
0 10
LEVEL
0 10
TIME
TVG
0 10
BRILL
FUSE
1 +
2 -
3 SHIELD
POWER CABLE
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