Bunn Coffee Maker iMIX-3 Service Manual
IMIX® &
IMIX®-S+
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
42032.0000A 06/09 ©2009 Bunn-O-Matic Corporation
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
(Excluding regular maintenance items)
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) All equipment other than as specified below: 2 years parts and 1 year labor.
2) Electronic circuit and/or control boards: parts and labor for 3 years.
3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.
4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis:
parts and labor for 3 years or 30,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by
it will be commercially free of defects in material and workmanship existing at the time of manufacture and
appearing within the applicable warranty period. This warranty does not apply to any equipment, component or
part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect,
alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is
conditioned on the Buyer 1) giving BUNN prompt notice of any claim to be made under this warranty by telephone
at (217) 529-6601 or by writing to Post Office Box 3227, Springfield, Illinois 62708-3227; 2) if requested by
BUNN, shipping the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior
authorization from BUNN that the defective equipment is under warranty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of BUNN
are not authorized to make modifications to this warranty or to make additional warranties that are binding on
BUNN. Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and
should not be relied upon.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its
exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts
and/or labor (during the applicable parts and labor warranty periods specified above) to repair the defective
components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall replace
the equipment or refund the purchase price for the equipment.
THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF
THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S
SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales,
loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute
equipment, facilities or services, or any other special, incidental or consequential damages.
BrewWISE, BrewLOGIC, BrewMETER, BrewWIZARD, Bunn Gourmet, BUNN Gourmet Ice, BUNN Pour-O-Matic, BUNN,
Bunn-OMatic, Bunn-O-Matic, BUNNlink, BUNNserve, BUNNSERVE, BUNN Espress, Cool Froth, DBC, Dr. Brew, Dual, EasyClear, EasyGard, Easy Pour, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, IMIX, Infusion Series, Intellisteam,
Quality Beverage Equipment Worldwide, The Mark of Quality in Beverage Equipment Worldwide, My Café, PowerLogic,
Safety-Fresh, Scale-Pro, Silver Series, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, System
III, ThermoFresh, 392, AutoPOD, AXIOM, Beverage Profit Calculator, Beverage Bar Creator, BUNNsource, Coffee At Its
Best, Digital Brewer Control, Nothing Brews Like a BUNN, Pouring Profits, Pulse Wave, Signature Series, Smart Heat,
Tea At Its Best, The Horizontal Red Line, Titan, Ultra, are either trademarks or registered trademarks of Bunn-O-Matic
Corporation.
2
42032 012609
INTRODUCTION
Safety first!
To avoid electrical shock, unplug dispenser from power source before servicing inside.
Basic Maintenance
In order to maintain proper machine operation, a Preventative Maintenance schedule must be performed on a
regular basis.
The following procedures pretain to all versions in the IMIX family of machines unless otherwise noted.
CONTENTS
Warranty ...................................................................................................................................2
User Notices .............................................................................................................................3
Site Preparation .......................................................................................................................3
Preventive Maintenance
Recommended Cleaning ....................................................................................................4
Preventive Maintenance Schedule .......................................................................................5
Troubleshooting ........................................................................................................................6
Service ....................................................................................................................................11
Electrical Schematics ..............................................................................................................42
USER NOTICES
All notices on this equipment are written for your protection. All notices are to be kept in good condition.
Replace any unreadable or damaged labels.
SITE PREPARATION
A minimal clearance is required between the dispenser sides and the wall or another appliances. Leave some
space so the dispenser can be moved for cleaning.
3
42032 060109
CLEANING
1 x 24h
37254.0000A 07/04 © 2004 BUNN-O-MATIC CORPORATION
NOTICE
The cleaning instructions noted above are for non-dairy sugar based food products. When dispensing any other food product,
the cleaning cycle for the whipping chamber assembly and ejector elbow must be performed daily.
NOTA:
Las instrucciones de limpieza descritas anteriormente excluyen productos lacteos azucarados. La limpieza de las camaras
de mezcla y de los codos de salida de cada tolva deberá realizarse diariamente.
1 x 7d
1
2
3
4
5
a. Wash
b. Rinse
c. Sanitize
d. Dry
a. Lave
b. Enjuague
c. Desinfecte
d. Seque
7
8
6
a
b
c
9
7
Replace Light Bulbs
as required.
1. Para limpiar las camaras de mezcla, coloque el interruptor en la
posicón ENJUAGUE/MARCHA (”RINSE/RUN”) y pulse el boton
para espumar y distribuir la bebida (”DISPENSE”).
2. Gire el codo hacia arriba, remueva las tolvas, llene las tolvas con
producto y coloque las tolvas nuevamente en la maquina.
3. Vacie la bandeja de goteo y limpiela con un detergente liquido
suave no abrasivo.
1. Rinse out Whipper Chambers by placing RINSE/RUN
switch in the "RINSE" position and activating DISPENSE
switches.
2. Turn elbow up, remove Hoppers, refill with product and
replace hoppers into dispenser
.
3. Empty Drip Tray and wash in a solution of dish detergent.
Cambie los bombillos
quemados cuando
sea necesario.
The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all surfaces on Bunn-O-Matic equipment. Do NOT clean this equipment with a water jet device.
4
42032 060109
REQUIRED REGULAR MAINTENANCE:
When performing Daily-Weekly Cleaning procedures, inspect o-rings, seals, and bushings for signs of wear or
damage and replace immediately.
Rinse once or twice daily or as required. On models IMIX-3, 4, 5, 3S+, & 5S+ a rinse reminder can be set using
the Rinse Alarm.
Check and/or replace every 6 months or as required:
32906.0001 Mixing Chamber Kit (Includes items indented below)
25732.0000 Steam Collector
25733.0003 Mixing Chamber
25734.0000 Whipper Chamber
25736.0000 Dispense Tip
24733.0010 O-ring
25902.0000 Frother
26356.0000 Shaft Seal
28866.0000 Receptacle
25903.0000 Elbow
Check and/or replace every 3 months or as required:
26356.1000 Whipper Shaft Seal Kit (Contains 6 Seals)
5
42032 060109
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic Technical Service
Department.
• Inspection,testing,andrepairofelectricalequipmentshouldbeperformedonlybyqualiedservicepersonnel.
• Allelectroniccomponentshave120voltacand/orlowvoltagedcpotentialontheirterminals.Shortingofterminalsor
the application of external voltages may result in board failure.
• Intermittentoperationofelectroniccircuitboardsisunlikely.Boardfailurewillnormallybepermanent.Ifanintermittent
condition is encountered, the cause will likely be a switch contact or a loose connection at a terminal or crimp.
• Keepawayfromcombustibles.
WARNING – • Exerciseextremecautionwhenservicingelectricalequipment.
• Unplugthedispenserwhenservicing,exceptwhenelectricaltestsarespecied.
• Followrecommendedserviceprocedures
• Replaceallprotectiveshieldsorsafetynotices
PROBLEM PROBABLE CAUSE REMEDY
Product will not dispense:
-no water and no powder (#2,3,7,11)
-yes water and no powder (#6,9,10,12)
-no water and yes powder (#1,4,5,8)
1. No water
2. No power or incorrect voltage to the
dispenser
3. Dispense switch
Water lines and valves to the dispenser must be
open. Read display for error.
Check for 120 volts at the terminal block across
the black and white wires on a two wire 120 volt
dispenser
Test dispense switch circuit, see “TEST SWITCHES ?” under “DIAGNOSTICS ?” menu.
4. Dispense solenoid valve
5. Solenoid valve (inlet)
6. Auger drive
7. Overflow protection Switch
8. Lime build-up
9. Hopper not seated on panel
10. Hopper out of product
11. Rinse cycle not run within programmed time frame
Test dispense solenoid valve circuit, see “TEST
DISPENSE HEAD ?” under “DIAGNOSTICS ?”
menu.
Test inlet solenoid valve, see “TEST REFIL ?”
under “DIAGNOSTIC ?” menu. Read display for
error.
Test auger motor circuit, see “TEST DISPENSE
HEAD ?” under “DIAGNOSTICS ?” menu.
Check for water in overflow cup. Read display
for error.
Inspect tank assembly for excessive lime deposits. Delime as required.
Seat hopper so that front leg engages metal tab
on hopper panel.
Refill hopper with correct product
Refer to Operations – Rinse Timer
12. Low product detect on and low powder.
6
Remove hopper to check level or calibrate hopper
42032 060109
TROUBLESHOOTING (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Water is not hot
1. Limit thermostat
Disconnect power and disconnect limit thermostat from wiring harness and test for continuity
Spitting or excessive steaming
Dripping from dispense tip
2. Control thermostat
3. Triac
4. Tank heater
1. Lime build up
2. Control thermostat
1. Lime build up
2. Dispense Solenoid Valve
(A) Check tank temperature setting in Programming menu
(B) Check temperature probe function and calibration, see “CAL tank temp” under “CALIBRATION ?” menu
Test triac, use “TANK HEATER ?” under “DIAGNOSTICS ?” menu
Disconnect wire leads from tank heater, check
for continuity across tank heater leads.
Inspect tank assembly for excessive lime deposits. Delime as required.
(A) Check tank temperature setting in Programming menu
(B) Check temperature probe function and calibration, see “CAL tank temp” under “CALIBRATION ?” menu
Inspect tank assembly for excessive lime deposits. Delime as required.
Remove the dispense solenoid valve and clear
any obstructions. Rebuild or replace valve as
necessary.
Water flows into tank continuously
Product overflows mixing chamber
1. Level probe
2. Solenoid valve (inlet)
3. Control board
1. Dispense tip
2. Dispense solenoid valve
3. Vacuum fan
Check for lime buildup on level probe. Clean as
required.
Test inlet solenoid valve, see “TEST REFIL ?” under “DIAGNOSTIC ?” menu
Test inlet solenoid valve circuit, see “TEST REFIL
?” under “DIAGNOSTIC ?” menu
Check dispense tip for obstructions.
Check valve flow rate.
Check vacuum fan operation.
7
42032 060109
TROUBLESHOOTING (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Weak product
1. Water temperature
Place an empty container beneath the dispense
tip. Initiate a dispense cycle and check water
temperature immediately below the dispense
tip with a thermometer. Repeat until maximum
temperature is reached. Reading should be 185
– 190°F. Adjust tank temperature setting using
programming menus.
2. Whipper motor
3. Frother
4. Dispense solenoid valve
5. Auger motor
6. Auger spring
7. NORMAL/PROGRAM/RINSE switch
8. Hopper out of product
9. Incorrect throw weight
Test whipper motor circuit, see “TEST DISPENSE
HEAD ?” under “DIAGNOSTICS ?” menu.
Check that frother is properly installed; refer to
cleaning decal inside front door.
Test dispense solenoid valve flow rate. In the
“RINSE” mode, momentarily press dispense
switch, and catch water in calibrated container.
Unit should dispense 12±.5 oz during 10 second
rinse cycle.
Test auger motor circuit, see “TEST DISPENSE
HEAD ?” under “DIAGNOSTICS ?” menu
Check that auger spring is properly installed, refer to cleaning decal inside of front door.
Check that switch is set in the “NORMAL” position.
Refill hopper with correct product
Check throw weight
Dispenser making unusual noises
Excessive dust
Display not lit
1. Plumbing lines
2. Water Supply
3. Tank heater
4. Frother
1. Fan
1. Lamp
2. Ballast
3. Night Mode
Plumbing lines should not be resting on the
counter top.
Water pressure to the dispenser not to exceed
90 psi (620 kPa) Install a regulator if necessary
to lower the working pressure to approximately
50 psi (345kPa).
Remove and clean lime off tank heater
Check for cleanliness and correct installation of
chamber and frother
(A) remove powder tray and clean as required
(B) check that air is blowing from slots in dispenser bottom panel.
Replace lamp if required
Disconnect ballast from power supply, check for
continuity between two black leads.
Check Night Mode Switch
8
42032 060109
TROUBLESHOOTING (cont.)
PROBLEM PROBABLE CAUSE REMEDY
LCD screen displays:
“FILL TIME TOO LONG”,
“CHECK WATER SUPPLY”
Occurs when refill runs without dispenses and without satisfying tank probe for
more than 10 minutes
(A) Test inlet solenoid valve, see “TEST REFIL ?”
under “DIAGNOSTIC ?” menu
(B) Check that unit is connected to water supply,
and water supply is turned on.
LCD screen displays;
“HEATING TIME”
“TOO LONG”
“CHECK HEATING” “CIRCUIT”
LCD screen displays: “OVERFLOW
CUP”
“FULL, EMPTY CUP”
“CHECK REFILL”
“CIRCUIT”
LCD screen displays:
“TANK TEMP SENSOR”
“OUT OF RANGE”,
“CHECK FOR BAD” “CONNECTIONS”
LCD screen displays:
“TANK TEMP SENSOR”
“OUT OF RANGE”,
“CHECK WIRE FOR” “SHORTS”
LCD screen displays:
“AUGER 1 FAULT!”
“CHECK MOTOR WIRING”,
“CHK RPM SENSOR”
“CHK MOTOR WIRING”
LCD screen displays:
“DISPLAY BOARD”
“COMM FAULT!”
“CHECK DISPLAY”
“ WIRING CONNECTS”
LCD screen displays:
“HOPPER 1 EMPTY?”
“MUST FILL HOPPER”
Occurs when heater runs for more than
120 minutes, refill does not come on , and
tank is still below target temperature.
Occurs when overflow cup is full of water
Occurs when tank sensor is disconnected
or resistance to high
Occurs when tank temperature sensor
wires are shorted together, or resistance
is to low.
Occurs when auger motor should be running, but no pulses are detected from the
RPM sensor
Occurs if display communication lost
Not applicable on (S+)
Occurs when low powder sensor returns
a value lower than threshold
Not applicable on (S+)
See “water is not hot” in PROBLEM section
above.
(A) Empty overflow cup of water
(B) Check for lime on level probe
(C) Test inlet solenoid valve, see “TEST REFIL ?”
under “DIAGNOSTIC ?” menu
(D) Check float switch for continuity
(A) Check that tank temp sensor is connected to
main wiring harness.
(B) Test tank temp sensor, see “CAL tank temp”
under “CALIBRATION ?” menu
(C) Verify wiring
(A) Disconnect tank temperature from main wire
harness, check for zero resistance across leads.
(B) Test tank temp sensor, see “CAL tank temp”
under “CALIBRATION ?” menu
(C) Verify wiring
Test auger motor circuit, see “TEST DISPENSE
HEAD ?” under “DIAGNOSTICS ?” menu
(A) Check wiring between main control board
and display
(B) Replace display board
(A) fill hopper with correct product
LCD screen displays:
“DISPNSE TO LONG”
“CHECK SWITCHES”,
“CHECK WIRE FOR”
“SHORTS”
LCD screen displays:
“RINSE REQUIRED!”
PLEASE RINSE NOW”
“TO OPERATE”
LCD screen displays:
“ENTER SETUP MODE”
“TO CLEAR FAULT”
Occurs when hot water is dispensed for
more than 2 minutes
Occurs when a rinse has not been performed within the specified time period
and the rinse alarm is enabled.
All fault messages show this for the last
of 3 alternating screens.
9
(B) Calibrate hopper level sensor, see “CAL HOPPER 1 ?” under “CALIBRATION ?” menu
Test dispense switch circuit, see “TEST SWITCHES ?” under “DIAGNOSTICS ?” menu.
Refer to Operations – Rinse Timer
Enter “SETUP” mode to clear fault after problem
has been corrected.
42032 060109
NOTES
10
42032 060109
SERVICE
This section provides procedures for testing and replacing various major components used in this dispenser
should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any
problem.
WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service
personnel. The dispenser should be disconnected from the power source when servicing, except when electrical
tests are required and the test procedure specifically states to connect the dispenser to the power source.
COMPONENT ACCESS
WARNING - Disconnect the dispenser from the power source before the removal of any panel or the replacement
of any component.
All components are accessible by opening the door, removal of the door panels, dispenser top covers,
hopper(s), hopper support plate, splash guard, splash panel w/drip tray, lower front access panel and rear access cover.
Refer to the contents listing for component location.
INDEX
Access Panels ..................................................................................................................................12
Audio Indicator ................................................................................................................................13
Auger Drive Components .................................................................................................................14
Ballast ..............................................................................................................................................17
Control Board (Main) .......................................................................................................................18
Programming Touchpad...................................................................................................................22
Programming Calibration & Diagnostics ..........................................................................................23
Control Board (Memory, Early Models) ............................................................................................24
Temperature Probe...........................................................................................................................25
Dispense Switches ...........................................................................................................................26
EMI Filter ..........................................................................................................................................28
Vacuum Fan .....................................................................................................................................29
Frother & Whipper Motor .................................................................................................................30
Lamp Holder ....................................................................................................................................32
Lamp ................................................................................................................................................32
Limit Thermostat ..............................................................................................................................33
ON/OFF/NIGHT Switch .....................................................................................................................34
NORMAL/PROGRAM/RINSE Switch ................................................................................................35
Overflow Protection Switch ..............................................................................................................37
Solenoid (Inlet) ................................................................................................................................37
Solenoid (Dispense) .........................................................................................................................38
Tank Heater ......................................................................................................................................39
Transformer .....................................................................................................................................40
Triac .................................................................................................................................................41
11
42032 060109
SERVICE(CONT.)
ACCESS PANELS
Location:
All access panels are similar through the whole IMIX family (IMIX-5 shown). Before removing panels, make
sure power is OFF to the machine and water is disconnected accept where indicated in testing procedures. Retain
all screws and other attaching hardware for re-assembly.
FIG. 1 ACCESS PANELS
12
42032 060109
SERVICE(CONT.)
AUDIO INDICATOR (IMIX-3, 4 & 5 only)
FIG. 2 AUDIO INDICATOR
BEEPER
Location:
The BEEPER is located on the back side of the
component bracket assembly.
P3250.25
Removal and Replacement:
1. Disconnect the dispenser from power.
2. Disconnect the two pin connector from J8 of the
main control board.
3. Loosen two screws from underneath and remove
the component mounting bracket.
4. Remove the two #6-32 screws attaching the Audio
Indicator to the component mounting bracket.
5. Remove and discard the audio indicator.
6. Install new audio indicator using two #8-32 screws
to secure indicator to the component bracket.
7. Refer to Fig. 3 when reconnecting the wires.
Test Procedures:
1. Enter Programming to verify the “Audible Alarm”
is activated. It will always beep when pressing
switches during program modes.
AUDIBLE ALARM ?
NO EXIT YES
If activated, verify it is plugged correctly into J8 on the
control board.
BLK to J8-1
on Control Board
RED to J8-2
on Control Board
P3250.25
FIG. 3 AUDIO INDICATOR
BEEPER
Specifications:
SOUND PRESSURE LEVEL 90 dBA
RESONANT FREQUENCY 2800 Hz
RATED CURRENT 7 mA
RATED VOLTAGE 12 VDC
OPERATING VOLTAGE 3 - 28 VDC
13
42032 060109
SERVICE (CONT.)
AUGER DRIVE COMPONENTS
P1341
FIG. 4 AUGER DRIVE COMPONENTS
Location:
The auger components are located inside the bottom
part of the hopper except for the auger drive bracket,
washer and locknut, which are located on the outside
bottom rear of the hopper. The auger motors are located
on the rear of the auger motor mounting panel. Refer
to Fig. 5 for disassembly and assembly.
Test Procedures - Auger Motors without Proximity
Sensor
1. Disconnect the dispenser from the power source.
2. Remove hoppers. Turn elbow up.
3. Back probe check the voltage across the positive
and negative wire with a voltmeter. Connect the
dispenser to the power supply. With the rinse/run
switch in the run position press the appropriate
dispense switch. After a .6 second delay the indication must be 4.0 to 24.5 volts dc.
4. Disconnect the dispenser from the power supply.
If voltage is present as described and the auger motor
does not rotate, replace the auger motor.
If voltage is not present as described, refer to the wiring diagrams and check the dispenser wiring harness
back to control board. Also verify 24 vac is supplied
to control board from transformer - Refer to Control
Board Testing.
Test Procedures - Auger Motors with Proximity Sensor.
(IMIX only)
1. Open door and flip switch into PROGRAM mode.
2. Scroll to Diagnostics and select YES.
3. Scroll to Test Augers.
4. Press the appropriate dispense switch to activate
motor. Refer to Diagnostics for further direction.
Removal, Cleaning and Replacement:
Hopper & Auger:
1. Open the dispenser door and turn elbow up.
2. Lift the front edge of hopper assy over the tab on
hopper support plate (16) and slide hopper assembly out the front of the dispenser.
3. Remove hopper lid (1) and empty product.
4. Pull off the ejector elbow (10).
5. Remove agitator disk assy (2) by pushing out on
the side of the hopper, rotating the agitator disk
assy out of the mounting hubs and lifting the
agitator disk assy from the hopper. Remove the
mixing blades (4) from the agitator disk by tugging
sharply.
6. Remove auger (9) by pulling it out the front of the
hopper (8).
7. Remove the auger drive bracket by turning it clockwise while holding the auger drive shaft firmly.
8. Slide auger drive shaft (5) from auger drive shaft
bushing (3) and remove from hopper (8).
9. Remove locknut (7) from auger drive shaft bushing (3) and remove auger drive shaft bushing from
hopper (8).
10. Wash components in a mild solution of dish detergent using a bristle brush when needed.
11. Rinse and dry each item thoroughly.
12. Check for damaged or broken components, replace
any if necessary and reassemble hopper assembly.
13. Install hopper assy in the dispenser by sliding
hopper assy in the guides on the hopper support
plate (16) until the slot in the bottom rear the hopper seats against the shoulder screw (15) in the
hopper support plate.
14
42032 060109
SERVICE (CONT.)
AUGER DRIVE COMPONENTS
6 17
18
12 7
11
15
13 14
FIG. 5 AUGER DRIVE & HOPPER DISASSEMBLY
1
4
2
3
5
8
16
9
10
P2210.30
3. Remove the #8-32 locking screws, located inside
the dispenser housing on the front of the auger
motor mounting panel (11), securing auger motor
(13) to the rear of the auger motor mounting panel
(11).
4. Disconnect the wires from the auger motor (13) to
be removed.
5. Disconnect RPM sensor plug.
6. Remove auger motor (13) and dust seal (14) as an
assembly.
7. Remove dust seal (14) from auger motor (13).
8. Remove the #8-32 screws securing the auger motor
to the auger motor mounting bracket.
9. Remove auger motor and discard.
10. Using #8-32 screws, install new auger motor (13)
on mounting bracket (11).
11. Install dust seal (14) on auger motor shaft.
12. Using #8-32 locking screws install auger motor and
dust seal to the rear of the auger motor mounting
panel (11)
13. Reconnect the wires to the terminals on the auger
motor.
14. Reconnect RPM sensor plug.
15. Install hopper support plate (16) and all hopper
assemblies.
16. Refer to Fig. 6 when reconnecting wires.
1. Hopper Lid
2. Agitator Disk Assy
3. Auger Drive Shaft
Bushing
4. Mixing Blade
5. Auger Drive Shaft
6. Auger Shaft Coupling
7. Locknut
8. Hopper
9. Auger Wire
10. Ejector Elbow
11. Auger Motor Mounting Panel
12. Auger Drive Coupling
13. Auger Motor
14. Dust Seal
15. Shoulder Screw
16. Hopper Support plate
17. Coupling Spring
18. Hex Coupling
Auger Drive Motor (Refer to Figs. 5 thru 9)
1. Remove all hopper assemblies and set aside for
reassembly.
2. Remove the four #8-32 screws securing the hopper
support plate (16) and set aside for reassembly.
15
BLK (-)
4-24 VDC
RED (+)
FIG. 6 AUGER MOTOR TERMINALS
P1639
42032 060109
SERVICE (CONT.)
AUGER MOTOR PROXIMITY RPM SENSOR (IMIX-3, 4 & 5 only)
MAGNET
NUT &
LOCKWASHER
PROXIMITY
SENSOR
FIG. 7 AUGER MOTOR PROXIMITY SENSOR
Location:
The Proximity Sensor and Magnet are located on
the back side of the Auger Motor assembly.
Test Procedures:
1. Ensure the the nut and lockwasher are tightened
securely to prevent the Magnet from slipping, which
causes a false reading when testing.
2. With a voltmeter, back probe the RED and BLK
wires. The indication should be +5VDC.
3. Back probe the BLK and GRN wires. The indication
should be an alternating reading of 5-0-5-0VDC.
With power ON, the reading will actually fluctuate
in the 3VDC range.
If voltage is present as described, the Proximity RPM
Sensor is operating properly.
BLK - COMMON
GRN - SIGNAL
RED - +5VDC
FIG. 8 PROXIMITY SENSOR TERMINALS
Removal and Replacement:
1. Disconnect the dispenser from the power source.
2. Disconnect the three pin connector from the main
wirring harnes of the motor being serviced.
3. Remove the #10 nut and lockwasher securing the
magnet hub to the auger motor shaft.
4. Remove the two #4-40 screws securing the sensor
to the auger motor housing.
5. Remove and discard faulty parts.
6. Install a new sensor to the motor housing using
the two #4-40 screws.
7. Install a new magnet hub using the #10 lockwasher
and nut. Tighten the nut securely to prevent the
magnet from slipping.
8. Connect the three pin connector to the dispenser
main wiring harness.
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