Japan Radio Co. JLN-740A, Instruction Manual

Page: 155 / 232

10-5 Chapter 10 Maintenance and Inspection
10
Fault symptom
JLN-
740A
JLN-
740N
JLN-
741A
JLN-
741N
Assumed cause Countermeasure
Alert “OVER SPEED
STW” is displayed.
   
Ship speed through
water exceeded the
speed limit setting
range.
Check the speed limit
setting. (Refer to
4.1.3.8 and 6.1.3.4.)
The date and time
that are displayed on
alert are incorrect.
  
The data is not
corrected from the
input from the GPS
sensor.
Check the
communication line
with the GPS sensor.
 
The power supply is
left in the Off state for
one week or longer.
Since the CQD-7040
super capacitor has
discharged, reset it
manually. When the
power supply is turned
on again, charging
starts.
 
The power supply is
left in the Off state for
one week or longer.
Since the
NWZ-510SDW super
capacitor has
discharged, reset it
manually. When the
power supply is turned
on again, charging
starts.
Although an alert is
displayed in the alert
list, the alert icon
remains in the normal
state.
 
The NWZ-510SDW
alert is set to OFF.
Contact JRC Sales
Department, or your
nearest branch, sales
office, or our
distributor.
The ship speed that is
displayed by the
analog display seems
to be incorrect.
 
The analog full scale
setting is incorrect.
Contact JRC Sales
Department, or your
nearest branch, sales
office, or our
distributor.
The ship speed
changes significantly
or cannot be
measured, or missing
data occurs during
sailing.
   
Influence of the
bubbles accumulated
around the transducer
radiation face.
Bubble entrainment
due to sailing over the
trail of another ship.
When the function is
not recovered during
sailing, contact JRC
Sales Department, or
your nearest branch,
sales office, or our
distributor.
   
Influence of the
bubbles accumulated
around the transducer
radiation face.
The bubbles produced
at pier docking are
accumulated at the
bottom of the ship
When the function is
not recovered after
leaving the port,
contact JRC Sales
Department, or your
nearest branch, sales
office, or our
distributor.