Bunn IMIX Service & Repair Manual
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Bunn IMIX Service & Repair Manual

Imix & imix-s+ series
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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

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  • Page 1 IMIX & ® IMIX ® 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...

  • Page 2: Warranty

    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.

  • Page 3: Table Of Contents

    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...

  • Page 4: Preventive Maintenance Recommended Cleaning

    CLEANING The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all sur- faces on Bunn-O-Matic equipment. Do NOT clean this equipment with a water jet device. 1 x 24h 1. Rinse out Whipper Chambers by placing RINSE/RUN 1.

  • Page 5: Preventive Maintenance Schedule

    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.

  • Page 6: Troubleshooting

    TROUBLESHOOTING A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encoun- tered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic Technical Service Department. • Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.
  • Page 7 TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Water is not hot 1. Limit thermostat Disconnect power and disconnect limit thermo- stat from wiring harness and test for continuity 2. Control thermostat (A) Check tank temperature setting in Program- ming menu (B) Check temperature probe function and cali- bration, see “CAL tank temp”...
  • Page 8 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 –...
  • Page 9 TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY LCD screen displays: Occurs when refill runs without dispens- (A) Test inlet solenoid valve, see “TEST REFIL ?” “FILL TIME TOO LONG”, es and without satisfying tank probe for under “DIAGNOSTIC ?” menu “CHECK WATER SUPPLY” more than 10 minutes (B) Check that unit is connected to water supply, and water supply is turned on.
  • Page 10 NOTES 42032 060109...

  • Page 11: Service

    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.

  • Page 12: Access Panels

    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.

  • Page 13: Audio Indicator

    SERVICE(CONT.) AUDIO INDICATOR (IMIX-3, 4 & 5 only) 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.

  • Page 14: Auger Drive Components

    SERVICE (CONT.) AUGER DRIVE COMPONENTS 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.
  • Page 15 SERVICE (CONT.) AUGER DRIVE COMPONENTS 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.
  • Page 16 SERVICE (CONT.) AUGER MOTOR PROXIMITY RPM SENSOR (IMIX-3, 4 & 5 only) MAGNET NUT & LOCKWASHER BLK - COMMON PROXIMITY GRN - SIGNAL SENSOR RED - +5VDC FIG. 7 AUGER MOTOR PROXIMITY SENSOR FIG. 8 PROXIMITY SENSOR TERMINALS Location: Removal and Replacement: The Proximity Sensor and Magnet are located on 1.

  • Page 17: Ballast

    SERVICE (cont.) BALLAST Removal and Replacement: 1. Disconnect the wires from the ballast. 2. Remove the two #8-32 screws securing the ballast to the component bracket. 3. Remove and discard ballast. 4. Install new ballast using two #8-32 screws to se- cure ballast to the component bracket.

  • Page 18: Control Board (Main)

    SERVICE (cont.) CONTROL BOARD (IMIX-3, 4 & 5 only) If voltage is present as described, proceed to step 9. If voltage is not present as described, refer to the Wir- ing Diagrams and check the dispenser wiring harness back to the power cord. Also check for an open float switch.
  • Page 19 SERVICE (cont.) CONTROL BOARD (cont.) Removal and Replacement: 1. Loosen the two #8-32 screws securing the com- ponent mounting bracket to the dispenser base. 2. Carefully pull the entire component bracket forward and rotate to gain access to the control board. 3.
  • Page 20 SERVICE (cont.) CONTROL BOARD (IMIX-3S+ & 5S+ only) If voltage is present as described, proceed to step 6. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring harness back to the power cord.
  • Page 21 SERVICE (cont.) CONTROL BOARD (cont.) Removal and Replacement: 1. Disconnect the three plugs on the main wiring har- ness from the connectors on the control board. 2. Remove the four #6-32 keps nuts securing the control board to the component bracket. 3.

  • Page 22: Programming Touchpad

    SERVICE (cont.) PROGRAMMING TOUCHPAD 6. Remove any excess adhesive from the door sur- face. 7. Remove the backing from the new touchpad. 8. Feed the seven pin harness through the openning and apply the new touchpad to the door. 9. Connect the touchpad harness to the display board.

  • Page 23: Programming Calibration & Diagnostics

    SERVICE (cont.) Calibration Diagnostics PROGRAMMING - CALIBRATION & DIAGNOSTICS TEST SWITCHES ? SELECT UNITS Use Switch To Test EXIT METRIC Adjust tank TANK TEMP XXX° EXIT temperature ENTER ASSET # ? EXIT CAL HOPPER 1 ? TEST HEATER ? EXIT Adjust minimum READY TEMP XXX°...

  • Page 24: Control Board (Memory, Early Models)

    SERVICE (cont.) MEMORY CLOCK BOARD (Early Models) (IMIX-3, 4 & 5 only) Removal and Replacement: 1. Disconnect the wiring harness from the memory board. 2. Remove the two #6-32 screws securing the mem- ory board to the component bracket. 3. Remove the two spacers from the memory board.

  • Page 25: Temperature Probe

    SERVICE (cont.) TEMPERATURE PROBE Removal and Replacement: 1. Disconnect the dispenser from the power source. 2. Remove the top rear cover. 3. Disconnct the two pin connector from the dis- penser main wiring harness. 4. Remove the temperature probe by firmly pulling- up on the tube at the tank lid.

  • Page 26: Dispense Switches

    7. Check for continuity across the terminals (top right to top left; bottom right to bottom left) of the dis- DISPENSE SWITCHES (IMIX-3S+ & 5S+ only) pense switch with the switch in the “ON” position. Continuity must not be present when the switch is in the “OFF”...
  • Page 27 SERVICE (cont.) DISPENSE SWITCHES PUSH BUTTON P3243 FIG.23 DISPENSE SWITCHES Location: The dispense buttons are located on the lower outside of the dispenser door and actuate switches on PORTION CONTROL the dispense switch board located on the inside of the door.

  • Page 28: Emi Filter

    SERVICE (cont.) EMI FILTER (230 Volt IMIX-3, 4 & 5 only) Removal and Replacement: 1. Disconnect the wires from the EMI Filter. 2. Remove the two #8-32 screws and nuts securing the EMI Filter. 3. Remove and discard EMI Filter.

  • Page 29: Vacuum Fan

    SERVICE (cont.) VACUUM FAN Removal and Replacement: 1. Disconnect the vacuum hose from the fan. 2. Remove the two #8-32 locking screws securing the fan to the dispenser housing base plate. 3. Disconnect the wires from the fan terminals and discard the fan 4.

  • Page 30: Frother & Whipper Motor

    SERVICE (cont.) 11 12 13 FROTHER AND WHIPPER MOTOR P1641.40 FIG. 29 FROTHER AND WHIPPER MOTOR Location: The frothers are located behind the dispenser door, 5 4 3 mounted on the whipper motor shaft inside the whipper P1630.35 chamber. FIG. 30 MIXING/WHIPPER CHAMBER The whipper motors are located on the back side COMPONENTS of the whipper motor mounting panel.
  • Page 31 SERVICE (cont.) FROTHER AND WHIPPER MOTOR (cont.) 20. Install whipper chamber (4) on the whipper chamber 6. Pull the frother (6) off the motor shaft. Notice the receptacle (8) by twisting counterclockwise until flat side on the shaft and the matching flat inside the tabs on the whipper chamber (4) lock with the the frother.

  • Page 32: Lamp Holder

    SERVICE (cont.) Removal and Replacement: LAMP AND LAMP HOLDER 1. Disconnect the dispenser from the power source. 2. Remove the outside window and display graphic. 3. Remove the two #4-40 screws securing the inside window to the door and remove window. 3.

  • Page 33: Limit Thermostat

    SERVICE (cont.) LIMIT THERMOSTAT If continuity is present as described, the limit thermostat is operating properly. If continuity is not present as described, replace the limit thermostat. Removal and Replacement: 1. Remove all wires from the limit thermostat termi- nals. 2.

  • Page 34: On/Off/Night Switch

    SERVICE (cont.) ON/OFF/NIGHT SWITCH Removal and Replacement: 1. Remove all wires from the switch terminals. 2. Compress the clipson the switch and gently push the switch through the opening in the panel. 3. Push the new switch into the opening of the panel so that the clips snap it securely into place.

  • Page 35: Normal/Program/Rinse Switch

    SERVICE (cont.) NORMAL/PROGRAM/RINSE SWITCH Removal and Replacement: 1. Remove all wires from the switch terminals. 2. Compress the clipson the switch and gently push the switch through the opening in the panel. 3. Push the new switch into the opening of the panel so that the clips snap it securely into place.

  • Page 36: Overflow Protection Switch

    SERVICE (cont.) Removal and Replacement: OVERFLOW PROTECTION SWITCH 1. Disconnect the red leads from the overflow protec- tion switch from the black wire and the blue wire from the main harness. 2. Remove the nut beneath the copper overflow cup. 3.

  • Page 37: Solenoid (Inlet)

    SERVICE (cont.) If the sound is heard as described and water will not SOLENOID VALVE (INLET) pass through the solenoid valve, there may be a block- age in the water line before the solenoid valve or, the solenoid valve may require inspection for wear, and removal of waterborne particles.

  • Page 38: Solenoid (Dispense)

    SERVICE (cont.) 6. Check the solenoid valve for coil action. Connect the dispenser to the power source. With “RUN/RINSE” SOLENOID VALVES (DISPENSE) switch in the “RINSE” (upper) position press the appropriate dispense switch and listen carefully in the vicinity of the solenoid valve for a “clicking” sound as the coil magnet attracts.

  • Page 39: Tank Heater

    SERVICE (cont.) Removal and Replacement: 1. Shut off water supply to the dispenser. TANK HEATER 2. Disconnect the water supply tube on the tank lid. 3. Disconnect the black wires on the limit thermo- stat. 4. Disconnect the black wire and the white or red wire from the tank heater terminals.

  • Page 40: Transformer

    SERVICE (cont.) TRANSFORMER If voltage is present as described the transformer is operating properly. If voltage is not present as described, replace the transformer. Removal and Replacement: 1. Loosen the two #8-32 screws securing the com- ponent bracket to the dispenser housing base. 2.

  • Page 41: Triac

    9. Refer to Schematic Wiring Diagrams for reconnect- Location: ing the wires. The triac is mounted on the right side of the tank mounting bracket for models IMIX-3,4 & 5. TAN to Main Harness Test Procedure: BLK to Terminal Block 1.

  • Page 42: Electrical Schematics

    I/O 37104.#### Application IMIX Type Values J1-1 J1-2 Heater Output 120 VAC Triac signal J1-3 Safety in Input Float switch IMIX and ICED J1-4 Neutral/L2 Input N or 120VAC Self explanatory J1-5 Input 120 VAC Self explanatory J1-6 Light...
  • Page 43 INPUT/OUTPUT CHART (Continued) for IMIX-3,4,5 J6-1 Auger 4 Output 0 to 24 VDC Adjustable to change dispense rate J6-2 RPM sensor Input Signal Hall Effect J6-3 RPM sensor Output 5 VDC + Power supply to Hall Effect J6-4 RPM sensor...
  • Page 44 INPUT/OUTPUT CHART (Continued) for IMIX-3,4,5 J12-1 Temp Sensor Input Varistor J12-2 J12-3 Level Probe signal Low AC Monitors tank level J12-4 Level Probe grnd Low AC Monitors tank level J12-5 Temp Sensor Input J12-6 J12-7 Run Position Input Signals run position from rinse run switch...
  • Page 45 SCHEMATIC WIRING DIAGRAM iMIX-3 LIMIT TRIAC THERMOSTAT TANK HEATER RED-16 (3-WIRE MODELS) BLK-16 BLU-16 BLK-16 WHI-16 (3-WIRE MODELS) REFILL VALVE OVERFLOW PROTECTION SW HOT WATER (OPTIONAL) RED/BLK BALLAST 1 AUGER #1 BRN/WHI GRN/BLK BALLAST 2 J3-1 AUGER MOTOR SPEED SENSOR...
  • Page 46 42032 060109...
  • Page 47 AUGER MOTOR BEEPER SPEED SENSOR WHIPPER #4 J6-5 DISPENSE VALVE #4 J12-1 HOPPER EMPTY DETECT SENSOR J6-10 J12-5 WHI/VIO NOT USED ON iMIX-4 MODELS J6-14 PROGRAM AUGER #5 PROBE WHI/BLU RINSE J7-1 J12-10 AUGER MOTOR SPEED SENSOR WHIPPER #5 WHI/YEL...
  • Page 48 42032 060109...
  • Page 49 INPUT/OUTPUT CHART for IMIX-3S+ & 5S+ iMIX-3S+/5S+ I/O 38831.#### Application IMIX Type Values J1-1 Program connector J1-2 Program connector J1-3 Program connector J1-4 Program connector J1-5 Program connector J1-6 Program connector J1-7 Program connector J1-8 Program connector J1-9 Program connector...
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This manual is also suitable for:

Imix-s+Imix-5Imix-3s+Imix-3Imix-4Imix-5s+

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