Aseptico AEU-25 User manual

SERVICE MANUAL
& PARTS LIST
AEU-25 Endo DTC

TABLE OF CONTENTS
General Service Information . . . . . . . . . . . .1
Inspection & Verification . . . . . . . . . . . . . . .1
Cleaning & Lubrication . . . . . . . . . . . . . . . .1
ONBOARD TEST PROGRAM
Test Program Access . . . . . . . . . . . . . . . . . . .2
Tests #1 thru #8 (Figs. 1 thru 14) . . . . . . . .2-6
Troubleshooting Guide/Final Test (Fig. 15) . .6
POWER PCB TESTING
PCB Testing Flowchart (Fig. 16) . . . . . . . . . .7
PCB Test Points (Fig. 17) . . . . . . . . . . . . . . . .9
MOTOR TESTING
Motor Calibration Error Testing (Fig. 18) . . .10
Motor Field Testing (Figs. 19 & 20) . . . . . . .11
REPROGRAMMING
Reprogramming the Unit (Figs. 21 thru 24) .12
HI-POT TEST
Hi-Pot Setup & Testing (Figs. 25 & 26) . . . .13
SYSTEM DISASSEMBLY
Chassis & Internals (Figs. 27 thru 29) . .14-15
STERILIZATION & MAINTENANCE
Handpieces & Motors (Fig. 30) . . . . . . . . . .16
FUSES
Changing the Fuse/Voltage (Figs. 31 & 32) .17
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . .18
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . .19
SYMBOL DEFINITIONS . . . . . . . . . . . . . . .19
SYSTEM TROUBLESHOOTING
• Troubleshooting Chart . . . . . . . . . . . . .20
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . .21
To prevent injury to people and damage
to property, please heed relevant
warnings and remarks. They are marked
as follows:
WARNING: Serious injury or death
may result if ignored.
CAUTION: Damage to property or
the environment may
result if ignored.
NOTE: Important additional
information and hints.
P.O. Box 1548
Woodinville, WA 98072
[phone] [phone]
www.aseptico.com

1
GENERAL SERVICE INFORMATION
This service and parts manual offers
information and parts lists not available in the
AEU-25 Endo DTC Operation and
Maintenance Instruction Manual. It will help
you better understand how the Endo DTC Unit
works, thereby reducing service time. Parts are
listed and referenced to callouts in the Parts
List. Use the information in the Parts List when
ordering replacement parts.
Inspection & Operation Verification
To verify that the Endo DTC unit is functioning
properly, follow the set-up procedure in the
Operation & Maintenance manual. First, check
that the voltage selector is set to the proper
voltage. Turn the fuseholder until the white
lettering with the proper voltage is right side
up. Use 115V for 110-120V 60 Hz voltages,
and the 230V for 220-250V 50Hz voltages.
Attach the power cord to the back of the
console and plug into a grounded electrical
outlet. Connect the AE-4B-30 motor to the
receptacle on the lower front panel of the
console. Attach the ‘E’ Type handpiece to the
motor. Attach the supplied AE-7P On/Off foot
switch to the connector on the back of the unit
marked “Foot Switch”. Turn the power switch
on the rear panel of the console ‘On’ (-)
position. The console LCD display should light
up and the startup screen will be displayed for
a few seconds. The screen should display the
software version onboard your Endo DTC:
ASEPTICO AEU-25
Software Rev. (-Revision Number-)
Press, hold, and release the “CAL” button to
enter the System Setup Menu. Follow the
menu commands displayed on the screen to
select appropriate menu options (refer to
Operation and Maintenance Instruction
Manual). Insert an endodontic rotary file into
the handpiece. Use the calibration function
(“CAL” button) to calibrate the Endo DTC
(refer to “FILE LIBRARY” and “OPERATION”
chapters in the Operation Manual for complete
file library selection and calibration
instructions).
The above procedures describe basic
inspection and verification of the Endo DTC. If
the unit still does not perform as required,
further diagnosis of components in the system
may require service. Use the Troubleshooting
section as a guide to symptoms and
appropriate procedures to fix various
problems.
Cleaning and Lubrication
When servicing the Endo DTC unit, a hot
detergent solution or alcohol are effective
cleaners on all non-electrical parts. Abrasive
cleaners have the potential to damage surface
finishes and should be avoided. Any wiping
should be done with a soft lint-free cloth.
Electrical parts should be cleaned with an
appropriate electrical parts cleaner or air.
Use a silicone base lubricating grease, such
as Dow Corning No. 103 to lubricate O-rings
and seals on handpieces. Before performing
any reassembly of parts that contain O-rings or
seals, apply a light coat of silicone grease.
This will make installation easier and prevent
the O-rings or seals from being damaged.

2
ONBOARD TEST PROGRAM
The Endo DTC provides a series of onboard tests that allows a technician to test/troubleshoot the
following functions and components:
•LEDs
•Console control buttons
•Console output speeds and currents to the motor
•LCD and console case
•Sleep mode
1. Set up the Endo DTC as described in the
Operation Manual, page 2.
2. Turn the Power Switch on the rear panel of
the console to the ‘ON’ (-) position. The
Console LCD Display will light up and the
Startup Screen will be displayed for a few
seconds and then default to the file system
information. The Startup Screen displays
the installed software version (Fig. 1).
3. Press, hold, and release the “CAL’ button
until two beeps are heard. This will access
the system setup menu (shown on the
right) -IMPORTANT: Ignore this setup
menu prompt and go directly to Step 4.
4. Press and hold the FWD/REV button until
one beep is heard. Then release the
button to access the Onboard Test
Program. The first test menu (LED Test)
will be displayed (see picture above).
Test Program Access:
Test #1 – LED Test:
1. Once the Onboard Test Program has been
accessed, the LED displays the “LEDs
Menu” (Fig. 2). This test confirms the
polarity of the LEDs by repeatedly
illuminating all three LEDs through a
sequence of green/orange/red colors.
2. Press the ‘1’
button to access
the next test
menu (Button
Test).
Figure 2
NOTE: The Onboard Test Program may be canceled at any time during this testing procedure by
rebooting the unit (turning power Off, then On again). This will not harm the Unit or its software,
however, the test will be interrupted and the entire procedure will have to be restarted.
NOTE: A handpiece does not have
to be attached to the system when
performing these tests.
Figure 1
(Step #3...) (...Step #4)

3
3. Press the ‘2’ button to access the next
test (10,000 RPM Test). A single beep
will be heard.
Test #2 – Button Test:
1. This test menu prompts the technician to
press each button (Fig. 3), to confirm that
each button switch is functioning properly.
As each button is pushed, the ‘0’ digit on
the menu turns to an ‘X’ digit (Fig. 4) and a
single beep is heard for each button.
2. Once each button has been tested and all
the ‘X’ digits are displayed, the unit
automatically accesses the next motor run
test menu (5,000 RPM Test).
NOTE: All
buttons must be
pressed before
moving on to
the next test.
Test #3 – 5,000 RPM Test:
1. This test menu displays the actual output
speed and current of the motor/handpiece
at 5,000 RPM. The first menu screen
displays the preset speed setting and
milliamps on the top line (Fig. 5).
2. Depress the footswitch pedal to operate
the motor/handpiece. The actual RPM and
current load (see Note) will be displayed on
the second line, in real time (Fig. 6).
Figure 5
Figure 4
Figure 3
Figure 6
NOTE:
When performing motor speed test, actual
current output may vary from preset mA
value, depending upon type of motor used.

4
ONBOARD TEST PROGRAM
- Cont’d
Test #4 – 10,000 RPM Test:
1. This test menu displays the actual output
speed and current to the motor/handpiece
at 10,000 RPM. The first menu screen
displays the preset speed setting and
milliamps on the top line (Fig. 7).
2. Depress the footswitch pedal to operate
the motor/handpiece. The actual RPM and
current load (see Note) will be displayed on
the second line, in real time (Fig. 8).
3. Press the ‘3’
button to access
the next test
(20,000 RPM
Test). A single
beep will be
heard.
Figure 7
Test #5 – 20,000 RPM Test:
1. This test menu displays the actual output
speed and current of the motor/handpiece
at 20,000 RPM. The first menu screen
displays the preset speed setting and
milliamps on the top line (Fig. 9).
2. Depress the footswitch pedal to operate
the motor/handpiece. The actual RPM and
current load (see Note) will be displayed
on the second line, in real time (Fig. 10)
3. Press the ‘4’
button to
access the next
test (30,000
RPM Test). A
single beep will
be heard.
Figure 8
Figure 10
Figure 9
NOTE:
When performing motor speed test, actual
current output may vary from preset mA
value, depending upon type of motor used.
NOTE:
When performing motor speed test, actual
current output may vary from preset mA
value, depending upon type of motor used.

5
paint; check the fit between the upper and
lower case halves; and, check the integrity
and luminance of each LCD character/digit,
and the background
intensity.
2. Press the ‘1’ button
to access the next
test (Sleep Mode
Test). A single beep
will be heard.
Test #6 – 30,000 RPM Test:
1. This test menu displays the actual output
speed and current of the motor/handpiece
at 30,000 RPM. The first menu screen
displays the preset speed setting and
milliamps on the top line (Fig. 11).
2. Depress the footswitch pedal to operate the
motor/handpiece. The actual RPM and
current load (see Note) will be displayed on
the second line, in real time (Fig. 12)
3. Press the ‘5’ button
to access the next
test (LCD and
Console Check). A
single beep will be
heard.
Figure 11
Test #7 – LCD & Console Check:
1. This test menu prompts the technician to
visually check the status of the console
paint finish, case seams, and the LCD
display (Fig. 13).
Check for scratches and/or flaking in the
Figure 13
Test #8 – Sleep Mode Test:
1. This final test of the onboard test program
puts the Endo DTC professional into a
sleep mode until reactivated (Fig. 14).
2. Press the ‘1’ button
to invoke the Sleep
Mode. The LCD will
turn off and all three
LEDs will continually
flash green.
3. Press the footswitch
or any button to reactivate the unit. This
will exit the onboard test program and reset
the unit’s LCD to the initial Startup Screen.
A single beep will be heard.
Figure 14
Figure 12
NOTE:
When performing motor speed test, actual
current output may vary from preset mA
value, depending upon type of motor used.

6
Figure 15 - Troubleshooting Guide/Final Test
ONBOARD TEST PROGRAM
- Cont’d
*Acceptable RPM Range: ±10% preset indicated
NOTE:
All RPM tests
require that the
motor/cable
assembly and
footswitch be
connected and
functional.

7
POWER PCB TESTING FLOWCHART
NOTE: If the test procedure on page 6 fails
to start properly, use this troubleshooting
guide to pinpoint the problem. This flow-
chart provides additional troubleshooting
procedures for the Endo DTC main power
printed circuit board (PCB). NOTE: If the
Figure 16 - Power PCB Troubleshooting Guide
power PCB or transformer is replaced, the
unit software must be reprogrammed and a
hi-pot test performed on the new board
(refer to pages 12 &13). For troubleshooting
procedures specific to the handpiece motor,
refer to the motor testing chart on page 10.
(*)Refer to Endo DTC Operation and Maintenance Manual

8
POWER PCB TESTING POINTS
1. Turn Endo DTC power switch ‘Off’.
Disconnect motor/cable and footswitch.
Disassemble top half of console chassis
from bottom half (refer to page 12). Turn top
half over and place on work bench to expose
internal components.
2. 115V or 220V AC Check: This test verifies
that the fuses are good and that proper AC
voltage is being provided to the PCB main
power circuit. Connect voltmeter test leads
to contacts as indicated in AC Voltage Ref.
‘A’, Fig. 17. Turn Endo DTC power switch
‘On’.
CAUTION: High voltages present - only
qualified technicians should perform
test. Use extreme caution to avoid
severe electric shock.
If 115V or 220 AC volts minimum are not
present, check power switch and fuses first,
then if proper voltage is still not present,
replace fuseholder assembly.
3. 30-35V DC Check: This test verifies that
proper DC voltage is being provided to the
board circuit. Connect voltmeter test leads
to contacts as indicated in DC Voltage
Reference ‘B’, Fig. 17. Turn Endo DTC
power switch ‘On’.
CAUTION: High voltages present -- only
qualified technicians should perform
test. Use extreme caution to avoid severe
electric shock.
Replace PCB board if minimum 30 volts
are not present.
4. 4.7-5V DC Check: This test verifies that
proper DC voltage is being provided to the
reprogramming circuit. Connect voltmeter
test leads to contacts as indicated in DC
Voltage Reference ‘C’, Fig. 17. Turn Endo
DTC power switch ‘On’.
CAUTION: High voltages present - only
qualified technicians should perform
test. Use extreme caution to avoid
severe electric shock.
Replace PCB board if minimum of 4.7 volts
are not present.
Dangerous voltages are present during the
following board testing. Severe electric shock can
result and could prove fatal. Only qualified
technicians should perform these tests.
WARNING

9
Figure 17 - PCB Test Points
(115VAC Ref.) (220VAC Ref.)

10
MOTOR CALIBRATION ERROR TESTING & FLOWCHART
Figure 18 - Motor Troubleshooting
NOTE: This section provides
troubleshooting procedures for the “Failed,
Check Motor” error message which
displays if the Endo DTC motor fails during
a handpiece calibration test (refer to
Operation Manual for complete handpiece
calibration instructions). In the event that
the troubleshooting information on Page 6
does not adequately pinpoint the problem,
this information will help determine if the
source of the problem is in the motor or the
unit console.
1. Remove handpiece from motor. Turn Endo
unit ‘On’. The Startup screen will appear.
2. Press ‘CAL’ button to enter the calibration
test. If the motor is malfunctioning, jammed
or disconnected, the message “Failed,
Check Motor And Retest” will be displayed.
If the motor is functioning properly, the
message “Testing In Progress - Please
Wait” will display and the unit will
automatically run through its calibration
program. The Endo DTC power PCB board
may be the source of the problem. For
troubleshooting procedures specific to the
PCB board, refer to the PCB testing chart
on page 7.

11
MOTOR FIELD TESTING
NOTE: Endo DTC motor testing in the field
is limited to simple manual and visual tests
that help to determine the source of the
problem. We recommend that the
motor/cord assembly be returned to
Aseptico for all repairs. Do not attempt to
disassemble the motor assembly.
1. Motor Rotation Test: This test can be
performed manually using a simple turning
tool that can be improvised in the field or
procured from Aseptico. The tool needs to
be able to grasp the motor’s internal
rotor/magnet assembly and rotate it to
determine if the assembly is damaged.
Insert tool into motor tip and engage rotor
shaft as shown in Figs. 19A & 19B. Turn
tool back and forth to determine if rotor
assembly moves freely (Fig. 19C). If
resistance is felt, return motor/cord
assembly to Aseptico for repair.
2. Connector Pin Test: This test consists of
a simple visual check of the pin condition
of the motor/cable connector socket on the
lower front of the Endo DTC console.
Refer to Figs. 20A, -B, and -C to determine
if pins appear damaged. If pins cannot be
repaired or the connector wiring assembly
replaced in the field, return the unit to
Aseptico for repairs.
Figure 19A - Motor Rotation Tool
Figure 19B - Motor Internals
Figure 19C - Rotor Rotation Test
Figure 20A - Pins Normal Figure 20B - Recessed Pin Figure 20C - Bent Pin
....Pin
Pushed In
...Pin
Bent Over
Rotate
Test Tool
Pin
Properly Aligned

12
REPROGRAMMING THE UNIT
The Endo DTC provides a Field
Programming tool (Ref PN AEU-25FP) that
enables a technician to reprogram the
Endo DTC software in the event the
existing software is accidentally erased or
corrupted. To reprogram the unit, follow the
steps below:
1. Install a standard 9 Volt battery onto the
Programmer (Fig. 21). The red and green
LEDs will illuminate for approximately 30
seconds and then turn off.
2. Turn the Endo DTC unit over to expose the
chassis bottom. Locate and remove the
plastic hole plug with a slot-head
screwdriver or other thin-edged tool. (Fig.
22).
3. Carefully insert the Programmer into the
hole as shown in Fig. 23 and plug 4-pin
socket into 4-pin connector port located on
printed circuit board below. NOTE: The
PCB includes a pin guide which prevents
misalignment of the Programmer socket to
the 4-pin connector (See inset in Fig. 23).
4. Press the small button switch located at the
top end of the Programmer to initiate
software download into the Endo DTC unit.
(Fig. 24 The red and green LEDs will flash
rapidly as the program downloads. If
reprogramming was successful, the green
LED will illuminate after the flashing stops,
or if unsuccessful, the red LED will light.
5. Once reprogramming is completed, remove
Field Programming tool, reinstall
programming port plug, and place Endo
DTC unit upright on its base. Turn unit
power ‘On’ and ensure that the proper
software level is shown on the startup
screen.
Figure 24
Figure 23
Figure 22
Figure 21
FRONT
OF UNIT
‘
Flashing
LEDs
Pin Guide On PCB
Board

13
HI-POT TEST (DIELECTRIC WITHSTAND VOLTAGE TEST)
The Hi-Pot (High Potential) test should be
performed each time a new power PCB
board or transformer are installed in the DTC
unit. Hi-Pot testing consists of two separate
test routines, typically performed in tandem
via two Hi-Pot test/measurement devices:
1. Dielectric Withstand Voltage Test -
This test stresses the Endo DTC unit’s
insulating material beyond what it will
encounter duing normal operation. It
assures that the unit will withstand higher
than normal voltage potentials before
flashover or breakdown. To test the Endo
DTC, set up the unit and test equipment as
shown in Figures 25 & 26.
NOTE: Test equipment shown in example
is the Associated Research, Inc. Model
3665 AC/DC Withstand Voltage Tester and
Model 3130 Ground Bond Tester.
Configure the hi-pot tester to apply 3000
VAC for one second across the mains
(appliance inlet) and the applied part
(motor shaft), with the leakage trip level at
the applied part set at 1.0mA.
NOTE: Ensure that the above test
parameters are set up correctly before
operating the test.
2. Ground Bond Test - This test is
performed between the earth terminal on
the appliance inlet and the applied part.
Configure the ground tester to apply
25Amps at 6VAC for two seconds, with a
limit of 0.1 Ohm.
NOTE: Ensure that the above test
parameters are set up correctly before
operating the test. Also, it may be
necessary to offset the resistance of the
power cord to achieve accurate readings.
IMPORTANT: Any system that fails
either of the above tests must be
removed from service and thoroughly
examined, repaired and retested by a
qualified technician.
Dangerous voltages are present during the
following Hi-Pot testing. Severe electric shock can
result and could prove fatal. Only qualified
technicians should perform these tests.
WARNING
Figure 25 - Example of Hi-Pot Equipment Set Up Figure 26 - Test Schematic
Hi-Pot & Ground Bond Test Units
Applied Part
Mains Power
Cord

14
Console Chassis:
1. Turn Endo DTC power switch ‘Off”.
Disconnect main power and footswitch
cables from back of console. Disconnect
motor/cable assembly from front of
console. (Fig. 27) NOTE: When removing
cables from unit, grasp connector at end of
cable. Do not pull on cords.
2. Remove lower front overlay from console
to expose two flat-head mounting screws.
Remove screws with a #2 Phillips head
screwdriver. (Fig. 28)
3. Remove the two mounting screws on the
back of the console with a 5/64-inch Allen
(hexagonal tip) wrench.
4. Turn Endo DTC console over and rest on
top side (place protective material under
top, to prevent scratches). Carefully pull
the bottom half of the chassis straight up
and off top half to expose internal
components. (Fig. 29)
Power Printed Circuit Board (PCB):
5. Disconnect footswitch 5-wire socket from
5-pin connector on power PCB. Take note
of the alignment of socket to connector pin
guide. (Fig. 29)
6. Disconnect motor 8-wire socket from 8-pin
connector on power PCB. Take note of the
alignment of socket to connector pin guide.
(Fig. 29)
7. Disconnect the two ribbon cable sockets
from their respective connectors on power
PCB. Take note of the orientation of red
stripe on each cable to their respective
connectors. (Fig. 29)
8. Locate the four jumper wires underneath
SYSTEM DISASSEMBLY
POWER CORD
CONSOLE
MOTOR
FOOT
SWITCH
MOTOR
HOLDER
Figure 27
HANDPIECE (Not Included)
Figure 28
Front Panel Screws
(Beneath Overlay)
LOWER
HALF
UPPER
HALF
the power PCB and disconnect their four
terminals at the power/fuse box. Take note
of the termination of each jumper wire from
power board to its respective fuse
connector on the box.
9. Locate the four holes on the PCB which
provide access to the transformer mounting
hardware (Fig. 29). Remove the four
screws (and lockwashers) with a #2
Phillips head screwdriver. Carefully lift
PCB/transformer assembly off the four
standoffs and remove from chassis.
IMPORTANT: Ensure that the Endo DTC power
is turned ‘Off’ and power disconnected before
disassembling unit.
OVERLAY

15
REASSEMBLY
Reassemble Control PCB, LCD Display IC,
Power PCB and Console Chassis in the
reverse order. Ensure all cable connectors
are properly aligned and securely connected.
When reattaching motor and footswitch
cables, take note of keyways on connectors.
LCD Display Integrated Circuit (IC):
10. Disconnect ribbon cable from IC board
connector. Note orientation of red stripe on
cable with connector.
11. Remove the three mounting nuts,
lockwashers, and insulators with a 3/16-
inch wrench.
12. Carefully remove IC board from chassis.
Remove the three spacers.
Control Printed Circuit Board (PCB):
13. Disconnect ribbon cable from connector on
control PCB. Note orientation of red stripe
on cable with connector.
14. Remove the four mounting nuts and
lockwashers with a 3/16-inch wrench.
15. Carefully remove the PCB from chassis.
Ribbon Cables
Access Holes
(4)
Figure 29 - Internal Components
Motor Connector
Wire Set
LCD Display IC
Footswitch
Wire Set
Chassis
Top
Control Panel PCB
Power PCB
(Red Stripe)
(Red Stripe)
(Red
Wire)
Footswitch Connector
(Red Wire)
Motor 8-Pin Connector
PCB-to-Fuseholder Jumper Wire Termination
(Jumper ‘A’)
(Jumper ‘B’)
(Jumper ‘C’)
(Jumper ‘D’)
(Terminal ‘A’)
(Terminal ‘B’)
(Terminal ‘C’)
(Terminal ‘D’)

16
STERILIZATION:
WARNING - Sterilize the motor
between each patient use.
WARNING - Use of a sterilization
method or temperatures other than what
are prescribed may damage the motor
or present a risk of cross-contamination
between patients.
CAUTION - Do not soak or submerge
the motor in any liquid.
STERILIZATION PROCEDURE:
Pre-clean
1) Thoroughly brush off any visible signs of
debris from the motor and cord.
2) Thoroughly clean the device with a moist
cloth or towel to remove any remaining signs
of debris.
Sterilize
3) Select one of the three following
sterilization methods (A. B. or C.):
Wrapped Sterilization – Place in an
appropriately sized sterilization pouch and
seal it.
A. Gravity Wrapped:
• Minimum Temperature:
132° C (270° F)
• Full Cycle Time: 20 minutes
• Minimum Dry time: 30 minutes
B. Prevacuum Wrapped:
• Preconditioning Pulses: 3
• Minimum Temperature:
132° C (270° F)
• Full Cycle Time: 4 minutes
• Minimum Dry time: 40 minutes
Flash Sterilization – For immediate use
only.
C. Gravity Unwrapped:
• Minimum Temperature:
132° C (270° F)
• Full Cycle Time: 10 minutes
No dry time is required for flash
sterilization.
MOTOR & CORD ASSEMBLY:
•The entire motor and cord assembly is fully
autoclavable. Before autoclaving the
assembly, remove any handpiece from motor
and install autoclaving plugs into the end of
the motor and motor cord connector as
shown below. The plugs are supplied with the
motor and cord.
• Loosely coil the motor cord when auto-
claving. Avoid sharply bending the cord when
autoclaving.
• Always install the autoclaving plugs into motor
and motor connector before autoclaving.
• If the autoclaving plug for the motor becomes
difficult to remove or install, apply silicone grease
or similar lubricant to the O-rings.
Turn black connector ring only
HANDPIECES - Thorough cleaning and
lubrication of handpieces after each use and
before sterilization is very important to ensure
proper operation and service life of the
handpiece. Follow the instructions provided with
the handpiece purchased for complete
maintenance instructions.
CONSOLE MAINTENANCE - The exterior of
the console may be cleaned by wiping with a
soft cloth moistened with mild detergent or
disinfecting solution.
MAINTENANCE & CLEANING:
• Do not attempt to disassemble the motor or motor connector.
• Do not oil or lubricate the motor.
• Do not attach a handpiece to the motor while motor is running.
• Do not bend motor cord sharply.
WARNING
Failure to comply with any of the above instructions may
void your warranty
NOTE: A handpiece does not have to be attached
to the system when performing the tests provided
in this service manual.
“E” TYPE
HANDPIECE
MOTOR
Figure 30 - Connecting Handpiece & Motor

17
1. Use a small flathead screwdriver to open
the Fuse/Voltage Selector Panel on the
back of the unit.
2. Remove the red Fuseholder from the unit.
3. Changing the fuse:
Replace the blown fuses on either side
of the Fuseholder.
Replacement Fuses:
115V: 1.0A/250V slo-blo fuse
220/230V: 0.5A/250V slo-blo fuse
4. Changing the voltage:
The proper fuses for the country of use are
sent in the unit. When changing voltage,
replace the fuses with fuses that are rated
for the new voltage.
Turn the Fuseholder until the white lettering
with the proper voltage is right side up.
5. Replace the Fuseholder and close the
Fuse/Voltage Selector Panel.
Turn the power off and unplug the
unit before following the steps below.
WARNING
1.
2.
4.
3.
Follow the corresponding steps to change
the voltage:
Do not attempt to operate the Endo DTC
professional while configured in the
115V mode with a 220/230V power
source. This could damage the electrical
components and will void the warranty.
CAUTION
CHANGING THE FUSE OR VOLTAGE
6. CHECKING THE FUSE & CONTACTS:
- Remove the Fuseholder from the unit as
described in steps #1 & #2 and remove the
cylindrical fuse (Fig. 31). Visually inspect
the fuse for a blown (burnt) element.
Replace fuse if necessary with properly
rated fuse.
- The cylindrical fuse snaps into a spring-
loaded contact in the fuseholder to ensure
positive contact (Fig. 31). Check position of
fuse/spring in holder (Fig. 32A). If fuse sits
too low (Fig.32B), spring contact could be
bent or broken. Carefully bend spring
outward until proper fuse height is achieved.
If spring is broken, replace entire
fuseholder block.
- Check fuseholder block for bent or broken
terminals. Replace block if necessary.
Figure 31
Figure 32A - Correct Fuse/Spring Position
Contact
Spring
Figure 32B - Wrong Fuse/Spring Position
Wrong Position
Fuseholder
Terminals
Fuse

18
PARTS LIST
Final Assy, AEU-25 . . . . . . . . . . . . . .120258 . . . . . . .1
Motor/Cable Assy, AE-4B 30K . . . . . .AE-4B-30 . . . . .1
Footswitch, On/Off 8 Pin . . . . . . . . . .AE-7P . . . . . . .1
Holder, Bench Mount, Mini Gry . . . . .AE-5FG . . . . . .1
Linecord, Remote US Hosp Gry . . . .840001 . . . . . . .1
Overlay, AEU-25 Control Panel . . . . .420289 . . . . . . .1
Overlay, AEU-25 Front Panel . . . . . .420290 . . . . . . .1
Chassis, AEU-25 Base Cmpl . . . . . .460987-08 . . . .1
Hole Plug, 1/2'' Nylon Blk Snap . . . .510512 . . . . . . .1
Foot Bumper, .5 x .14 Cylin Blk . . . .850008 . . . . . . .1
Screw, M/S Steel FlaPhl 6-32x3/8 . .510071 . . . . . . .2
Chassis, AEU-25 Top Cmpl Wht . . . .460988-08 . . . .1
PCB Assy, AEU-25 Power Complete 330329-01 . . . .1
PCB Assy, AEU-25 Control . . . . . . . .330328 . . . . . . .1
IC, LCM-S02002DSF LCD Display . .880117 . . . . . . .1
1
ITEM PART NO QTY
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16 Power Inlet, Fused Dual-V Snap In . .840062 . . . . . . .1
Cable Ribbon, 16 Pin x 8'' . . . . . . . . .870241 . . . . . . .2
Wire Set, AEU-17BE Foot Switch . . .875009 . . . . . . .1
Wire Set, AEU-17BE Motor Conn . . .875008 . . . . . . .1
Spacer, Alum 10-32x1Lx5/16 Hex . . .510480 . . . . . . .4
Spacer, Nyl 1/4Rndx.210Lx.14ID . . .510022 . . . . . . .4
Spacer, Nyl 1/4ODx.14IDx.285 . . . . .460993 . . . . . . .3
Nut, Hex 4-40 Sml Ptn Pltd . . . . . . . .510005 . . . . . . .11
Insulator, PPS Shld/Washer #4 . . . . .850011 . . . . . . .3
Washer, Split Pltd #4 . . . . . . . . . . . . .510004 . . . . . . .11
ITEM PART NO QTY
25
17
18
19
20
21
22
23
24
Not Shown, Washer, Split Stnls #10 . . . .510559 . . . . . . .4
Not Shown, Nut, Keps Pltd 6-32 . . . . . . .510006 . . . . . . .2
Not Shown, Screw, PanPhl 10-32x1-1/2 .510558 . . . . . . .4
Not Shown, Screw, BtnSoc 6-32x1/4 . . .510037 . . . . . . .2
Not Shown, Software, AEU-25 . . . . . . . .890001 . . . . . . .1
9
11
18
19
13
6
12
14
23
25
22
5
7
21
15
24
17
20
16
10
8
1
3
2
HANDPIECE
(Not Included)
4