JRC JFE-380 - 6.5 Troubleshooting; Troubleshooting Common Issues

6. Maintenance & Check 53
6.5 Troubleshooting
The table below shows the principal symptom, the cause, and measurements. As a result, request the repair
to our company or our agency when it is not possible to recover to normal operational condition.
Symptom Cause Measurements
The screen doesn't appear
even if power switch
(PWR) is pressed.
The breaker of AC100-230V of the
ship is "OFF".
Make the breaker of AC100-230V of the
ship "ON".
The disconnection of the power supply
AC inboard cable or the screw in the
connecting terminal has loosened.
Repair the cable.
Tighten the screw in the connecting
terminal surely.
Blowing the fuse. Replace fuses.
The depth value is not
displayed.
Only the oscillation line is
displayed in the image of a
standard mode.
Actual sea bottom is deeper than the
setting of range.
(out of range)
Make the range setting AUTO.
Or, change the range setting manually
and adjust it.
The transducer cable has been
disconnected.
Repair the cable.
The depth value is not
displayed.
The sea bottom echo is
slightly recorded by the
image of a standard mode.
The sensitivity setting is too weak. Make the sensitivity setting AUTO.
Or, raise sensitivity.
Sea bottom is mud (weak stratum). Make the sensitivity setting AUTO.
Or, raise sensitivity.
The oyster and the barnacle adhere to
the transducer.
Remove the adhesion thing of the
transducer at dry-dock.
The cable disconnection of the
transducer or the screw in the
connecting terminal has loosened.
Check whether for be disconnected of
the one side of the transducer.
Tighten the screw in the connecting
terminal surely.
The depth value is not
correct.
A set value of the draft adjustment is
not correct.
Set a correct value.
The depth value is not
correct.
In the image of a standard
mode, the record mistaken
in a middle layer as sea
bottom appears.
The sensitivity setting is too strong. It is recorded to garbage in water, dirt,
and plankton's layers that sensitivity is
too high, and recognizes sea bottom
this.
Make the sensitivity setting AUTO.
Or, lower sensitivity.
There are a lot of records
of the noise.
Noise generated from dynamo. Check the dynamo.
The main unit earth is imperfect. Check the main unit earth.
External interference noise. The influence of the underwater sonic
prospecting equipment of another ship
has been received.
This symptom is not a trouble of this
equipment and originates in an external
factor.