Troubleshooting - JRC JFE-680 Instruction Manual

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
The screen doesn't appear
even if power switch
(PWR) is pressed.
The depth value is not
displayed.
Only the oscillation line is
displayed in the image of a
standard mode.
The depth value is not
displayed.
The sea bottom echo is
slightly recorded by the
image of a standard mode.
The depth value is not
correct.
The depth value is not
correct.
In the image of a standard
mode, the record mistaken
in a middle layer as sea
bottom appears.
There are a lot of records
of the noise.
Cause
The breaker of AC100-230V of the
ship is "OFF".
The disconnection of the power supply
AC inboard cable or the screw in the
connecting terminal has loosened.
Blowing the fuse.
Actual sea bottom is deeper than the
setting of range.
(out of range)
The transducer cable has been
disconnected.
The sensitivity setting is too weak.
Sea bottom is mud (weak stratum).
The oyster and the barnacle adhere to
the transducer.
The cable disconnection
transducer or the screw in the
connecting terminal has loosened.
A set value of the draft adjustment is
not correct.
The sensitivity setting is too strong.
Noise generated from dynamo.
The main unit earth is imperfect.
External interference noise.
Measurements
Make the breaker of AC100-230V of the
ship "ON".
Repair the cable.
Tighten the screw in the connecting
terminal surely.
Replace fuses.
Make the range setting AUTO.
Or, change the range setting manually
and adjust it.
Repair the cable.
Make the sensitivity setting AUTO.
Or, raise sensitivity.
Make the sensitivity setting AUTO.
Or, raise sensitivity.
Remove the adhesion thing of the
transducer at dry-dock.
of the Check whether for be disconnected of
the one side of the transducer.
Tighten the screw in the connecting
terminal surely.
Set a correct value.
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.
Check the dynamo.
Check the main unit earth.
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.
6. Maintenance & Check 59