Morita ROOT ZX II User manual

Dental root canal measurement and treatment unit
Low Speed Handpiece Module
Operation Instructions
* Low Speed Handpiece Module must be connected to Canal Measurement Module,
which is sold separately. This unit cannot be used as an independent unit.
USP. 5980248
USP. 5897315
USP. 5902105
USP. 5096419
USP. 5211556
USP. 5295833
DBP. PAT. 4126753
DBP. PAT. 4139424
DBP. PAT. 4232487
KOREA PAT. 159070
JAPAN PAT. 2873722
JAPAN PAT. 2873725
JAPAN PAT. 3071245
JAPAN PAT. 3071270
JAPAN PAT. 3113109
JAPAN PAT. 3113095
JAPAN PAT. 3213484
This manual is for Low Speed Handpiece Module.
To measure a root canal refer to the manual for Canal Measurement Module.

I
Operation 12. 21. ’04
Thank you for purchasing ROOT ZX II Low Speed Handpiece Module.
For optimum safety and performance, read this manual thoroughly before using the unit and pay
close attention to warnings and notes. Keep this manual in a readily accessible place for quick and
easy reference. This manual contains essential safety information.
CONTENTS
Page
1. Prevent Accidents.................................................................................................................... 1
2. Parts Identification................................................................................................................. 5
3. Assembling the Unit............................................................................................................... 6
4. Before Using the Unit............................................................................................................. 8
5. Operating the Unit ................................................................................................................11
6. After Using the Unit..............................................................................................................22
7. Sterilization, Replacement Parts and Storage....................................................................24
(1) Sterilization ................................................................................................................24
(2) Replacement Parts......................................................................................................26
(3) Storage ........................................................................................................................27
8. Maintenance and Inspection.................................................................................................28
9. Troubleshooting......................................................................................................................29
10. Replacement Parts List.........................................................................................................31
11. Technical Specifications ........................................................................................................32
12. Warranty.................................................................................................................................37

Page 1
Operation 12. 21. ’04
1. Prevent Accidents
Most operation and maintenance problems result from insufficient attention being paid to basic
safety precautions and not being able to foresee the possibilities of accidents.
Problems and accidents are best avoided by foreseeing the possibility of danger and operating the
unit in accordance with the manufacturer’s recommendations.
Note the meaning of the following symbols and expressions:
WARNING This warns that it may result serious injury of the patient or
operator if the instructions are not followed properly.
PROHIBITION The user can not use in such a way that may result in serious
injury of the patient or operator.
NOTE This alerts the user to the possibility of damage to the equipment,
potential injury of the patient or operator, or important points
concerning operation and performance.
The user ( e.g. the hospital, clinic etc. ) is the party responsible for the maintenance and proper
operation of ROOT ZX II Low Speed Handpiece Module.
ROOT ZX II Low Speed Handpiece Module must only be operated by dentists and other legally
licensed professionals.
Do not use this equipment for anything other than its specified purpose.

Page 2
Operation 12. 21. ’04
WARNING
• This unit must not be connected to or used in combination with any other apparatus or
system. It must not be used as an integral component of any other apparatus or system.
J. Morita Mfg. Corp. will not be responsible for accidents, equipment damage, bodily
injury or any other trouble which results from ignoring this prohibition.
• Do not injure your fingers when inserting or removing files.
• Do not use damaged file holders; an accurate measurement can not be made with a
damaged file holder.
• When continuous tone is heard while the main power switch is on and without any
operation, some electrical part may be malfunction. Do not use the unit and send the unit
to J. Morita office for repairing.
• This unit is for prescription use only.
• A rubber dam should be used when performing endodontic treatment.
•
Caution: US Federal law restricts this unit to sale by or on the order of a dentist in U.S.A.
• Do not use the unit when the AC adapter is connected. ( see page 7, 22 )
• Never operate the unit with an external power supply. ( see page 7, 23 )
• If an electrical storm occurs while the battery is being charged, do not touch the AC
adapter or the charger’s power supply cord as there would be a risk receiving an electric
shock. ( see page 7, 23 )
• After attaching contra angle to the micromotor, give the micromotor a light tug to confirm
it is securely attached. ( see page 8 )
•
After attaching the micromotor to handpiece cord, give the micromotor a light tug to
confirm it is securely attached. ( see page 8 )
•
Plastic sleeves must be replaced after each patient. ( see page 8 )
•
Never use stretched, deformed or damaged files. ( see page 9)
• Give the file a light tug to confirm it is securely held in place. If the file is not securely
placed, it could come out and injure the patient. ( see page 9)
• Take care to avoid the risk of a file being swallowed by the patient. ( see page 9)
• Check the unit’s operation before each patient. If the indicators in the display do not
appear normally, the unit may not be able to make an accurate measurement. In this
case, stop using the unit and have it repaired. ( see page 10)
• When measuring the length of a root canal, make sure that the file electrode does not
come into contact with an electric power source such as an electrical socket. This could
result in a severe electrical shock. ( see page 12)
• Before measuring length of a root canal, make sure that the rotation speed does not
appear on the display. If the rotation speed appears on the display, the unit is set for
root canal preparation mode, and the handpiece will operate. ( see page 12)
• When shaping a root canal, make sure that the file or contrary electrode does not come
into contact with an electric power source such as an electrical socket. This could result in
a severe electrical shock. ( see page 13)
• Check the settings on the display after selecting memories. ( see page 14 )
• In some cases such as a blocked root canal, a measurement can not be made.( see page 16 )
• Accurate measurement is not always possible, especially in cases of abnormal or unusual
root canal morphology; make sure to take an x-ray to check the measurement results.
( see page 16 )
• Stop using the unit immediately if it does not seem to be working properly. ( see page 16 )
• If the motor overheats, remove the micromotor from the patient’s mouth, wait until it
cools down to resume treatment. ( see page 18 )
• Electric noise could cause malfunction of the unit. Do not depend entirely on the unit
controlling itself; always watch the display, listen to the sound and be aware of tactile
feedback. ( see page 19 )

Page 3
Operation 12. 21. ’04
WARNING
• Accurate measurement is not always possible depending on the root canal condition.
Make sure to take an x-ray to check the results. Also Nickel-Titanium files can
sometimes wear out rather quickly depending on the shape and the degree of curvature of
the root canal. Stop using the unit immediately if it does not seem to be working properly.
( see page 19 )
• When shaping and cleaning a root canal, make sure that the file or contrary electrode
does not come in contact with an electrical power source such as an electrical socket.
This could result in a severe electrical shock. ( see page 19 )
• Nickel-Titanium files are more easily broken than stainless steel files by the amount of
torque applied to them. Do not try to force the file down the root canal. Also do not use
these files for the root canals that have a relatively sharp curve near the apical foramen.
( see page 19 )
• Nickel-Titanium files will eventually break due to metal fatigue and should be replaced
before they reach this point. ( see page 19 )
• Always examine files for separation and other deformities or damage before using them.
Any type of deformity could result in the file breaking. ( see page 19 )
• If the file touches the oral mucosa or a tooth, it will automatically start to rotate and
could injure the patient. ( see page 19 )
• Do not touch the oral mucosa with the metal part at the end of the contra angle. This
could result in injuring the patient. ( see page 19 )
• If the contra angle’s file release button is pressed against the teeth opposite the one being
treated, the file could come out and injure the patient. ( see page 19 )
• Never press the file release button while the micromotor is running. This could cause
the button to heat up and burn the patient or the file to come out and injure the patient.
( see page 19 )
• Be careful when using the foot switch; the motor may rotate regardless of the
measurement results. ( see page 20 )
• If [F.02] appears in the display, noise has been detected. Turn the unit off and then back
on again. If [F.02] still appears, stop using the unit and contact your local dealer or the
J. Morita regional office. ( see page 22 )
• Autoclave the contra angle after each patient. ( see page 24 )
• Replace the file electrode when it is worn to the
extent indicated in the illustration. It could
break if used after reaching this point.
( see page 26 )
Worn Area
File Electrode
Worn Area

Page 4
Operation 12. 21. ’04
PROHIBITION
• Do not use this unit in conjunction with an electric scalpel or on patients who have a
pacemaker.
• Do not use this unit in the medical operation room.
• Blocked canals cannot be accurately measured.
• This unit must not be connected to or used in combination with any other apparatus or
system. It must not be used as an integral component of any other apparatus or system.
J. Morita Mfg. Corp. will not be responsible for accidents, equipment damage, bodily
injury or any other trouble which results from ignoring this prohibition.
• Illumination devices such as fluorescent lights and the Film viewer which use an inverter
can cause ROOT ZX II to operate erratically. Do not use ROOT ZX II near devices such
as these.
• Electromagnetic wave interference could cause this unit to operate in an abnormal,
random and possibly dangerous manner. Cellular phone, transceivers, remote controls
and all other devices which transmit electromagnetic waves located inside the building
should be turned off.

Page 5
Operation 12. 21. ’04
2. Parts Identification
*Low Speed Handpiece Module must be connected to Canal Measurement Module.
*Low Speed Handpiece Module cannot be used as an independent unit.
*In this manual, root canal measurement unit is called Canal Measurement Module and root
canal treatment unit is called Low Speed Handpiece Module.
Accessories
Micromotor (1) Contra Angle (1) Handpiece Cord (1)
TR800-Blue Line
TR400-Green Line (Option)
Handpiece Rest (1) AR Oil (1) AC Adapter (1)
Battery (1) Foot Switch (1) Plastic Sleeve (20)
Foot Switch Low Speed Handpiece Module
Handpiece Cord
Canal Measurement Module
(Sold separately)
Liquid Crystal Display
Set Switch
Select Switch
Mode Switch
Power Switch
Micromotor
Contra Angle
Contrary Electrode
(Canal Measurement
Module accessory)
(Pre-installed)

Page 6
Operation 12. 21. ’04
3. Assembling the Unit
Attaching Low Speed Handpiece Module to
Canal Measurement Module
1. Hold the cover and slide the stopper on the bottom
towards the liquid crystal display.
2. Slide the cover in the direction indicated by the arrow in
the illustration and remove it from Canal Measurement
Module .
* The cover and batteries will not be used.
3. Line up the tabs on Low Speed Handpiece Module
with the notches in Canal Measurement Module and put
them together.
4. Slide Low Speed Handpiece Module all the way down
until it is securely attached.
NOTE
• If the catch on the bottom is not back in its original
place after attachment, push it in the direction shown
by the arrow in the illustration.
• After installation, give Low Speed Handpiece Module
a light tug to confirm it is securely attached.
Tabs
Notches
Canal Measurement
Module
Low Speed
Hand
p
iece Module
Stopper
Cover
Canal Measurement Module
Cover
Canal
Measurement
Module
Low Speed Handpiece Module

Page 7
Operation 12. 21. ’04
Charging Battery
The battery is built into Low Speed Handpiece Module.
NOTE
• The battery is not charged when the unit is shipped
from the factory and must be charged before using
the unit.
• If the plug for the AC adapter does not fit the socket,
it is the user’s responsibility to find a suitable plug
adapter.
1. Line up the arrow ( ) on the AC adapter’s connector with the triangle ( ◀ ) above its jack on
the left side of Low Speed Handpiece Module and plug it in. Then plug the adapter into the
electrical power receptacle.
WARNING
• Do not use the unit when the AC adapter is connected.
2. The Amber Charge LED on the back of Low Speed
Handpiece Module starts flashing on and off and then,
after a few seconds, it will stop flashing and stay on to
show that the battery is being charged. It takes
about 60 minutes to fully charge the battery.
3. Amber Charge LED goes out when the battery is fully charged.
4. Disconnect the AC adapter from Low Speed Handpiece Module and unplug it.
WARNING
•
Never operate the unit with an external power supply.
•
If an electrical storm occurs while the battery is being charged, do not touch the AC adapter or
the charger’s power supply cord as there would be a risk receiving an electric shock.
NOTE
• Do not pull or yank the cord when disconnecting the AC adapter.
Amber Charge LED On
Low Speed Handpiece Module
AC Adapter Plug

Page 8
Operation 12. 21. ’04
4. Before Using the Unit
Assembling Micromotor
* Contra angle must be lubricated with AR Oil before
using for the first time. Refer to “Lubricating the
Contra Angle” on page 25.
1. Line up the arrow ( ) on the handpiece cord
connector with the triangle (▼) above its jack on the left
side of Low Speed Handpiece Module and plug it in.
NOTE
•
Handle Low Speed Handpiece Module carefully; do not
drop, bump or expose it to other kinds of impacts or
shocks. Rough handling could cause damage.
• Make sure the plug is securely plugged into the jack.
A poor connection can cause malfunction.
• Do not drop anything on or bang the plug after it has
been inserted into the jack.
2. Line up the dots on the micromotor and contra angle
and slide the contra angle straight onto the micromotor
until it clicks securely into place. The contra angle has
a simple snap-on connection.
WARNING
• After attaching contra angle to the micromotor, give
the micromotor a light tug to confirm it is securely
attached.
3. Line up the triangle (▼) to connect the micromotor to
handpiece cord.
WARNING
• After attaching the micromotor to handpiece cord, give
the micromotor a light tug to confirm it is securely
attached.
4. Put a plastic sleeve on the micromotor portion.
WARNING
• Plastic sleeves must be replaced after each patient.
Micromotor
Handpiece
Cord
▲Triangle Marks
Contra Angle
Micromotor
●Dots
Handpiece Cord Plug
Low Speed Handpiece Module
Plug in until the tip of
the arrow reaches the
surface marked with
the small triangle (▼).

Page 9
Operation 12. 21. ’04
Assembling File and File Electrode
Use only nickel-titanium files for root canal preparation.
WARNING
• Never use stretched, deformed or damaged files.
1. Gently pull back the file electrode.
2. Hold down the file release button on the contra angle
and insert the file. Turn the file back and forth until it
is lined up with interior latch groove and slips into place.
Release the button to lock the file into the contra angle.
WARNING
• Give the file a light tug to confirm it is securely held in
place. If the file is not securely placed, it could come
out and injure the patient.
• Take care to avoid the risk of a file being swallowed by
the patient.
NOTE
•
Use caution when inserting and removing files to
avoid injury to fingers.
• Inserting and removing files without holding the file
release button may damage the chuck.
• Do not attach the file electrode to files with a shaft
diameter of 1.2mm or greater, or large shafted tools
such as Largo bur. The file electrode cannot be
attached to files and Gates-Glidden reamers that do
not have circular shafts. Set the unit for manual
mode when using these types of instruments.
3. Gently clip the file electrode securely onto the file.
NOTE
•
Do not clip the file electrode to the cutting part of the
file.
• The file electrode cannot be attached onto some files.
Attaching Contrary Electrode
Insert the contrary electrode (lip clip) into the connector of
the handpiece cord. (The contrary electrode is an accessory
provided with Canal Measurement Module.)
NOTE
•
Always hold the connector to connect or disconnect
cords.
File Release Button
File Electrode
Contrary
Electrode Connector

Page 10
Operation 12. 21. ’04
Attaching Foot Switch
Insert the foot switch plug all the way into its jack on the
left side of Low Speed Handpiece Module. [This jack is
marked with a triangle (▲) pointing up.]
NOTE
●
Always hold the connector to connect or disconnect
cords.
Checking the Function
1. Press the Power switch to turn the unit on. Display used
for root canal preparation will appear.
* The unit will automatically turn off after 5 minutes of
non-use.
2. Check that the handpiece cord is properly plugged into
the jack.
3. Check that the contra angle is securely attached to the
micromotor.
4. Check that the file is properly installed. Give it a light
tug to confirm.
5. Check that the file electrode is properly clipped onto the
file.
6. Check that the contrary electrode is attached to the
connector of the handpiece cord.
7. Contact the file with contrary electrode and check that
all the canal length indicator bars on the display are lit,
the word “APEX” flashes and audible beep becomes
continuous. Use caution when contacting the file with
contrary electrode as the file starts to rotate as soon as
the file touches the contrary electrode.
WARNING
● Check the unit’s operation before each patient. If the
indicators in the display do not appear normally, the
unit may not be able to make an accurate
measurement. In this case, stop using the unit and
have it repaired.
Power Switch
Foot Switch Plug
Contrary
Eelectrode
File Holder Contact

Page 11
Operation 12. 21. ’04
5. Operating the Unit
Overview of Features and Functions
The combination of Low Speed Handpiece Module with Canal Measurement Module allows the
micromotor to be controlled in a variety of ways. The root canal can be prepared with great
precision and delicacy.
* File Rotation Speed
9 speeds setting from 0 rpm to 800 rpm can be selected.
* Auto Start and Stop
The file automatically starts to rotate when it is inserted into a root canal and stops when it is
removed.
* Auto Apical Reverse and Auto Apical Stop
The file either reverses its rotation or stops when the file tip reaches the Apical Line.
* Auto Torque Reverse
The file automatically reverses its rotation
when the torque load reaches a specified preset
value.
Torque Setting for Auto Torque Reverse
There are 11 settings available for the value of
the torque that will trigger the Auto Torque
Reverse function. The Auto Torque Reverse
function can also be turned off. Please refer the
chart on the right.
*
These torque values vary somewhat depending
on the condition of the micromotor and the
gears.
* Auto Apical Slow Down
The file automatically slows down as it approaches the apex so that the region near the apical
foramen can be treated with a slow gentle rotation. This function can also be turned off.
The rate at which the file slows down depends on the speed setting. The chart below shows
how the file slows down when the speed is set for 800 rpm.
Position of file tip RPM
Beyond Apex 150
Apex – 0.5 200
0.5 – 1.0 250
1.0 – 1.5 300
1.5 – 2.0 400
2.0 – 2.5 500
2.5 – 3.0 600
3.0 800
* Setting Stopping Time before the File Reverses
When Auto Apical Reverse function is triggered, the interval between the file stopping
rotation and reversing can be set.
* Adjustable Sound Volume
Volume of audible signal can be adjusted.
* The unit will automatically go into the root canal measurement mode if it detects any
abnormality such as the one caused by electrical noise. However, it will return to the normal
mode when the file is taken out of the root canal.
To r q u e L i n e Torque (g·cm)
Approx.
To r q u e ( N · c m )
Approx.
1 30 0.3
2 60 0.6
3 90 0.9
4 120 1.2
5 150 1.5
6 180 1.8
7 250 2.5
8 300 3.0
9 350 3.4
10 400 3.9
11 500 4.9
ALL OFF OFF
* Setting the torque line level 10 or 11 could
result in the file engaging in the canal wall
and locking up.

Page 12
Operation 12. 21. ’04
Easy Operation
Press the Power switch to turn the unit on and press the Mode switch to select any one of three
memories.
Each memory can be set for different motor control parameters. The desired set of parameters can
be easily selected by pressing Mode switch button.
Manual Operation
Foot switch allows the file to rotate outside the root canal. The file can rotate manually even without
the foot switch when the unit is set in manual mode. The file rotation can also be reversed manually
when the file is engaged too deeply in the root canal. (Use caution when using this function as the
file reverses at a considerable rate of speed and torque.)
Root Canal Measurement (Two Methods)
Plug the probe cord into Canal Measurement Module and connect the file
holder and contrary electrode.
1. Leaving the micromotor connected and press the Mode
switch until the speed and memory displays disappear.
(Refer to the operation manual for Canal Measurement
Module.)
2. Detach the micromotor from handpiece cord. Select M1,
M2 or M3 with pressing the Mode switch and measure
length of a root canal. (Refer to the operation manual
for Canal Measurement Module.)
WARNING
• When measuring the length of a root canal, make sure that the file electrode does not come
into contact with an electric power source such as an electrical socket. This could result in a
severe electrical shock.
• Before measuring length of a root canal, make sure that the rotation speed does not appear on
the display. If the rotation speed appears on the display, the unit is set for root canal
preparation mode, and the handpiece will operate.
NOTE
•
It is best to disconnect the handpiece when measuring the root canal.
• Remove the file from the micromotor when taking a measurement.
Rotation speed is
not displayed.
Probe Cord Plug
Memories are not displayed.
Rotation speed is
not displayed.

Page 13
Operation 12. 21. ’04
Shaping the Root Canal
Plug the handpiece cord into Low Speed Handpiece Module and then
connect the handpiece and the contra angle.
Press the Mode switch to select M1, M2, or M3, and then
perform root canal shaping.
WARNING
• When shaping a root canal, make sure that the file
or contrary electrode does not come into contact with
an electric power source such as an electrical socket.
This could result in a severe electrical shock.
NOTE
• Make sure to remove a file from the micromotor
after completing root canal preparation.
Handpiece Cord Plug

Page 14
Operation 12. 21. ’04
Liquid Crystal Display and Switches Torque Settings
NOTE
• The torque settings must be changed depending on the root canal condition.
• When the torque is set on the torque line 10 or 11, the file could be engaged in the root canal wall
and lock up. When this happens, set the micromotor for reverse rotation ( see page 21, “2.
Reverse Rotation” ) to free the file.
• When the Auto Torque Reverse function is turned off, the file could be engaged in the root canal
and lock up. When this happens, set the micromotor for reverse rotation ( see page 21, “2.
Reverse Rotation” ) to free the file.
• When the Auto Torque Reverse seems to be triggered too frequently, increase the torque setting
by one line.
Setting and Changing Memory
Use the Mode Switch to select M1, M2 or M3. Use the Select switch to select rotation speed, Torque
Line or Apical Line. Use the Set Switch to set the memory contents.
Press Mode to select the
memory.
M1
(memory 1)
Root Canal Preparation
Mode 1
Torque Line selected.
Set Torque Line.
M2
(memory 2)
Root Canal Preparation
Mode 2
Apical Line selected.
Apical Line
The apical line can
be set between 2
and APEX.
M3
(memory 3)
Root Canal Preparation
Mode 3
Rotation Speed.
400 rpm
Speed can be set
for 0, 150, 200,
250, 300, 400, 500,
600 and 800 rpm.
No
display
Root canal
measurement mode
* All memory settings will be retained even after the unit is turned off. Simply select M1, M2, or
M3 to use those memory settings. If the micromotor is connected, M1 will be selected when the
unit is turned on. (If the micromotor is not connected, the memory selected will be the same as
when the unit was turned off.)
* If the memory display does not appear, the unit is set for root canal measurement.
WARNING
• Check the settings on the display after selecting memories.
Apical Reverse or Stop Control
Set the unit to reverse its rotation or stop
when the file tip reaches the position
specified by the Apical Line.
Apical Line
Use this line as an estimate of the root canal’s
working length. It is set anywhere between 2 and
Apex. The file automatically stops and reverses its
rotation when the file tip reaches this line (Auto
Apical Reverse function). A continuous beep will
also sound when the file reverses its rotation.
* Use this line as an estimate for a root canal
length measurement.
Sound Volume
Off, Low and High
Torque Line
11 settings for auto torque reverse.
This function may be turned off.
The motor automatically
reverses if the torque
exceeds the specified limit.
Refer to the NOTE
concerning the torque
setting on the right side of
this page.
If all torque lines are lit
up, the reverse torque
function is turned off.
NOTE
• If all the torque lines are
lit up, the motor will not
reverse itself no matter
how much torque is
applied. In this case,
make sure that the file
is not engaged in the
canal or it will break.
Rotation Speed
Speed is set for 0, 150,
200, 250, 300, 400, 500,
600 and 800 rpm. Refer
to “Setting and Changing
Memory” on the right
side of this page.
NOTE
• Make sure the speed is
not displayed when
measuring the length
of the root canal.
Motor Stopping Time for Apical Reverse
0, 0.25, 0.5, and 1 second
The file rotation stops for the specified period before it reverses.
Meter Gauge
* The numerals 1,
2, and 3 do not
represent length
in millimeters.
Battery Power
Indicator
This bar graph
shows how much
battery power is
left. Charge the
battery as soon as
this graph starts
flashing on and off.
NOTE
• Never use the
unit when the
battery power
display is
flashing. The
motor will not
operate when
this display is
flashing.
Memory (M1, M2, and M3)
Refer to the section "Setting and Changing
Memory" for details.
* These are not displayed when measuring
root canal with the micromotor connected.
When the micromotor is disconnected, M1,
M2, and M3 will represent the Root Canal
Measurement modes, not the Root Canal
Preparation modes. Refer to the operation
manual for Canal Measurement Module.
NOTE
• Each memory has its own unique
settings.
Manual Mode
Use the manual
mode to operate the
unit outside the
canal.
(See page 21 for
details.)
Canal Length
Indicator Bar
Flashes
Set the memory
content.
Select the function
(The display will briefly flash on and off.)
Flashes
Press Press
File Rotation Controls near the Apical Foramen
Slow Down：File rotation slows down as it
approaches the apical foramen for
safe treatment.
Normal ：File rotates at specified speed even
near the apical foramen.
* Reverse rotation speed is the same as
forward rotation speed except when
forward rotation is set for the
maximum, in which case, the reverse
speed is one level slower than the
forward speed.
Power
Switch
Mode
Switch
Select
Switch
Set
Switch
* Speed settings for the TR-400
handpiece (option) are 0, 50, 100,
150, 200, 250, 300, 350 and 400.

Page 15
Operation 12. 21. ’04
Setting Memories for Other Functions
1. Turn the power off.
2. Press the Select switch and turn the power back on without releasing the Select switch.
3. Release the Select switch and press the Mode switch to select M1, M2, or M3.
4. Press the Select switch 4 times to pass the Torque Line, Apical Line and Speed settings.
5. Press Set switch to enter the settings into the memory.
Select the item.
(Display will briefly flash on and
off.)
Set the memory content.
Turn sound off.
Set Sound Volume low
Sound volume selected
Flashes
Set Sound Volume high
Rotation control when file tip reaches
Apical Line.
Flashes
Set for Reverse.
Rotation control as file tip approaches
apical foramen.
Flashes
Set for Slow Down.
0 sec.
0.25 sec.
0.5 sec.
Apical reverse stop time.
Flashes
1 sec.
Press Press

Page 16
Operation 12. 21. ’04
Meter Display
* The position of the file tip is shown by the canal length
indicator bar on the display. The apical line flashes on
and off once file is inserted into the root canal.
NOTE
•
Occasionally the canal length indicator bar makes a
sudden and large movement as soon as the file is
inserted into the root canal, but it will return to
normal as the file is advanced down towards the apex.
WARNING
•
In some cases such as a blocked root canal, a
measurement can not be made.
• Accurate measurement is not always possible,
especially in cases of abnormal or unusual root canal
morphology; make sure to take an x-ray to check the
measurement results.
• Stop using the unit immediately if it does not seem to
be working properly.
* Refer to the separate manual for the root canal
measurement unit (Canal Measurement Module) for
instructions on how to measure a root canal.
•The meter’s 0.5 reading indicates that the tip of the file
is in the apical constriction.
* The numerals on the meter gauge do not represent
length in millimeters.
•If the file tip passes the point indicated by the apical
line, the alarm sound will change from beeping to solid
tone. If the file tip reaches the major foramen, the
word “APEX” and the triangle next to the apical line will
start to flash.
Flashes
Apical Line
Canal Length Indicator Bar
Flashes
Flashes

Page 17
Operation 12. 21. ’04
Operating the Micromotor
1. Turn the unit on.
2. Hook the contrary electrode in the corner of the patient's
mouth.
NOTE
•
The contrary electrode could cause an adverse
reaction if the patient has an allergy to metals. Ask
the patient about this before using the contrary
electrode.
• Take care that medicinal solutions such as formalin
cresol (FC) or sodium hypochlorite do not get on the
contrary electrode or the file holder. These could
cause an adverse reaction such as inflammation.
3. Press the Mode switch and select M1, M2, or M3.
* See page 15 for how to set the memory contents.
* During actual root canal preparation, none of the
switches except the Power switch will work.
* Before using the micromotor, use a small file, such as #10
or #15, to penetrate the root canal manually down to the
apex and then return to the apical constriction.
4. The file will automatically start to rotate when it is inserted into the root canal (Auto Start). If
the root canal is extremely dry, the Auto Start function may not operate.
NOTE
•
If the Auto Start function does not operate because the root canal is extremely dry, moisten
the root canal with a liquid such as hydrogen peroxide, sodium hypochlorite or saline solution.
Do not let the liquid overflow from the root canal opening.
• Applying excessive force could cause the file to be engaged in the root canal wall and lock up.
5. If the unit is set for Auto Apical reverse, the file will stop and reverse its rotation when the file
tip reaches the point specified by the reverse position setting (Auto Apical Reverse). Or if it is
set for Apical Stop, the file will stop when the file tip reaches the point specified by reverse
position setting. A single sustained beep will sound when this happens.
6. If more than the specified amount of the torque is applied to the file, the file will automatically
reverse its rotation (Auto Torque Reverse). A three-toned alarm will sound when this happens.
Corner of
mouth
Contrary
Electrode
Corner of mouth
Contrary
electrode
Mode Switch

Page 18
Operation 12. 21. ’04
* Motor Overheating
To protect the unit from serious internal damage, the micromotor stops running if the
temperature inside the motor exceeds about 125°C (257°F). In this case, the entire display
flashes on and off. The micromotor will not resume until the temperature inside the motor cools
down to about 100°C (212°F).
WARNING
•
If the motor overheats, remove the micromotor from the patient’s mouth, wait until it cools
down to resume treatment.
NOTE
•
The motor may overheat if an excessive force is applied.
• If the motor overheats, do not detach the micromotor from the handpiece cord.
• Even if the motor has cooled down enough to operate, it could still be rather hot and excessive
force should not be applied to it.
* While an overheated motor is cooling down, the power cannot be turned off. “O.H.” appears in
the display and the unit can not be turned off even with pressing the Power switch. The unit
will automatically turn off after the motor has cooled down. Simply press the Power switch to
turn it back on.
7. The file will stop to rotate when it is removed from the root canal (Auto Stop). Gradually
increase the size of the file until the root canal preparation is completed.
8. If necessary, prepare the apical seat.