User`s manual
Operation 2011-09-30
19
8.
Troubleshooting
If the equipment does not seem to be working properly, the user should first try to inspect and adjust it
himself.
* If the user is unable to inspect the equipment himself or if the equipment fails to work properly after
being adjusted or after parts are replaced, contact your local dealer or the J. Morita Corp.
Problem Check Points Response
No power
Check battery installation.
Check battery power.
Install batteries properly.
Replace batteries.
Cannot make a
Measurement.
Check cord connections.
Check probe cord for broken wire.
Check that all connections are properly secured.
Touch the contrary electrode to the file holder to
check probe cord conductivity.
No alarm sound. Check if sound is turned off. Turn the sound on.
Cannot switch
memories.
Cannot change
memory settings.
Is a measurement being
performed?
Does the switch work?
The memory cannot be changed while the unit is
making a measurement.
Switch may be broken.
Display does not
appear.
Try replacing the dry cells. If new dry cells do not solve the problem, the
LCD may be malfunctioning.
Canal Length
Indicator is unstable.
Is contrary electrode making good
contact with oral mucosa?
Is the file holder dirty?
Make sure the contrary electrode makes good
contact with the oral mucosa.
Clean the file holder with Ethanol for
Disinfection (Ethanol 70~80 vol%).
Canal Length
Indicator overreacts
or is too sensitive.
(Measurements are
too short. Poor
accuracy. Erratic
results.)
Is blood or saliva overflowing from
the opening of the crown?
Is the canal filled with blood,
saliva or chemical solutions?
Is the tooth surface covered with
cutting debris or chemical
solutions?
Is the file touching the gingival
tissue?
Is there pulp tissue left inside the
root canal?
Is the file touching a metal
prosthesis?
Are proximal surfaces infected
with caries?
If blood or other fluids overflow the canal, the
current will leak to the gums and the meter will
jump to Apex. Clean the canal, canal opening
and tooth crown thoroughly.
The canal length indicator bar may suddenly
swing when it breaks the surface of fluids inside
the canal, but it will return to normal as the file
is advanced down toward the apex.
Clean entire tooth surface.
This will cause the canal length indicator bar to
suddenly jump all the way to the “APEX”.
Accurate measurements cannot be obtained if a
large amount of pulp tissue is left inside the root
canal.
Touching a metal prosthesis with the file allows
a flow of current to the gingival tissue or
periodontal pocket and will cause the meter to
jump to the “APEX”.
Current can flow through the caries infected area
to the gums and prevent an accurate
measurement from being made.