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KitchenAid KAC-24 Technical Education

Built-in microwave oven
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KAC-24
TECHNICAL EDUCATION
BUILT-IN

MICROWAVE OVEN

JOB AID 4317283

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  Summary of Contents for KitchenAid KAC-24

  • Page 1: Microwave Oven

    KAC-24 TECHNICAL EDUCATION BUILT-IN MICROWAVE OVEN JOB AID 4317283...
  • Page 2 This Job Aid, “KitchenAid Built-In Microwave Oven,” (Part No. 4317283), provides the technician with information on the installation and service of the KitchenAid Built-In Microwave Oven. It is to be used as a training Job Aid and Service Manual. For specific information on the model being serviced, refer to the “Use and Care Guide,”...
  • Page 3: Table Of Contents

    Table of Contents Page SPECIFICATIONS ........................1-1 COMPONENT ACCESS ......................2-1 Oven Cabinet Component Locations ................... 2-1 Microwave Oven Component Locations ................2-1 Removing The Microwave Oven Assembly ................. 2-2 Removing The Oven Control & Display Boards And The Touch Panel Assembly ..................2-3 Removing The Low Voltage Transformer, The Light Power Supply, &...
  • Page 4 KITCHENAID MODEL & SERIAL NUMBER DESIGNATIONS MODEL NUMBER MODEL NUMBER INTERNATIONAL SALES IND. OR MARKETING CHANNEL IF PRESENT PRODUCT GROUP K = KITCHENAID BRAND PRODUCT IDENTIFICATION BH = BUILT-IN HIGH-SPEED OVEN BM = BUILT-IN MICROWAVE CM = COUNTERTOP MICROWAVE HM = MICROWAVE HOOD...
  • Page 5 MODEL NUMBER MODEL NUMBER INTERNATIONAL SALES IND. OR MARKETING CHANNEL IF PRESENT PRODUCT GROUP K = KITCHENAID BRAND PRODUCT IDENTIFICATION BH = BUILT-IN HIGH-SPEED OVEN BM = BUILT-IN MICROWAVE CM = COUNTERTOP MICROWAVE HM = MICROWAVE HOOD MERCHANDISING SCHEME S = STANDARD...
  • Page 6 MODEL & SERIAL NUMBER LABEL AND TECH SHEET LOCATIONS The Model/Serial Number label and Tech Sheet locations are shown below. Model & Serial Number Location Tech Sheet Location (Below Top Front Cover) - vi -...
  • Page 7: Important Safety Information

    IMPORTANT SAFETY INFORMATION Your safety and the safety of others is very important. Important safety messages have been provided in this Job Aid. Always read and obey all safety messages. This is the safety alert symbol. This symbol alerts you to hazards that can kill or hurt you and others. All safety messages will be preceded by the safety alert symbol and the word “WARNING.”...
  • Page 8: Warning To Service Technicians

    • Untrained personnel should not attempt service without a thorough review of test procedures and safety information contained in this Job Aid. KitchenAid microwave ovens have a monitoring system designed to assure proper operation of the safety interlock systems. The interlock monitor switch will immediately cause the oven fuse to blow if the door is opened and the primary door interlock switch and/or the secondary interlock switch contacts fail in a closed position.
  • Page 9: To Excessive Microwave Energy

    Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy Do not operate or allow the oven to be operated with the door open. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary.
  • Page 10 WARNING CAUTION • Disconnect the oven from electrical sup- • High voltages are present during the cook ply before servicing. Failure to do so could cycle. Extreme caution should be ob- result in electrical shock or death. served at all times. •...
  • Page 11 R.F. LEAKAGE TEST EQUIPMENT NOTE: Enter leakage readings in space BE- FORE and AFTER on the service document. • Electromagnetic energy leakage monitor All microwave ovens exceeding the emission (NARDA 81 00B, HOLADAY H 1 501 ). level of 4 mw/cm must be reported to Dept.
  • Page 12 — NOTES — - xii -...
  • Page 13: Specifications

    SPECIFICATIONS KBMC140H KBMC147H Model Number Release Info Built In Microwave Built In Microwave Model Description 30" 27" Size-Configuration Crisp Convection Crisp Convection Feature Level/Series Dimensions/Specifications Exterior Dimensions 20 1/2" 20 1/2" Overall Height (in) 29 3/4" 26 3/4" Overall Width (in) 19 7/16"...
  • Page 14 Model Number KBHC179J KBHC109J Release Info Colors Black, White, Stainless, Biscuit Black, White, Stainless, Biscuit Model Model Description Built-In High Speed Built-In High Speed Size-Configuration 27" 30" Feature Level/Series Crisp Convection Crisp Convection Dimensions/Specifications Exterior Dimensions Overall Height (in) 20 1/2" 20 1/2"...
  • Page 15: Component Access

    COMPONENT ACCESS This section instructs you on how to service each component inside the Model KBMC147H Built- In Microwave Oven. The components and their locations are shown below. OVEN CABINET COMPONENT LOCATIONS Blower Motor Suppressor Board Light Power Supply Low Voltage Oven Control &...
  • Page 16: Removing The Microwave Oven Assembly

    REMOVING THE MICROWAVE OVEN ASSEMBLY To remove the side trim, pull the bottom WARNING out approximately 2˝ and slide the top down to disengage it from the front panel. Electrical Shock Hazard Slide Down Disconnect power before servicing. Replace all panels before operating. Failure to do so could result in death or electrical shock.
  • Page 17: Removing The Oven Control & Display Boards And The Touch Panel Assembly

    REMOVING THE OVEN CONTROL & DISPLAY BOARDS AND THE TOUCH PANEL ASSEMBLY To remove the oven control panel, pull it WARNING out at the bottom, and lift and unhook it from the oven cabinet support at the top. Electrical Shock Hazard Disconnect power before servicing.
  • Page 18 To remove the oven control & display To remove the touch panel assembly: boards: a) Remove the standoffs and spacers from a) Remove the seven mounting screws. over the mounting studs. b) Lift the ends of the locking arm and Touch Panel disconnect the ribbon cable from its Assembly...
  • Page 19: Removing The Low Voltage Transformer, The Light Power Supply, & Suppressor Board

    REMOVING THE LOW VOLTAGE TRANSFORMER, THE LIGHT POWER SUPPLY, & SUPPRESSOR BOARD To remove the low voltage transformer: WARNING a) Disconnect the 10-hole connector from the control board at P17. Electrical Shock Hazard b) Remove the mounting screw at the top Disconnect power before servicing.
  • Page 20 Suppressor Board To remove the suppressor board: White Wires Black Wires a) Remove the hex nuts from the black and white wires and remove the wires from the screw terminals. b) Remove the mounting screw holding the suppressor board to the terminal strip.
  • Page 21: Removing The Blower Motor Assembly

    REMOVING THE BLOWER MOTOR ASSEMBLY Remove the four screws from the blower WARNING cover and remove the cover. Electrical Shock Hazard Disconnect power before servicing. Replace all panels before operating. Failure to do so could result in death or electrical shock. 2 Screws Blower Cover 2 Screws...
  • Page 22: Removing The Microwave Oven From The Oven Cabinet

    REMOVING THE MICROWAVE OVEN FROM THE OVEN CABINET Remove the two screws from the lower WARNING microwave mounting brackets. Electrical Shock Hazard Disconnect power before servicing. Replace all panels before operating. Lower Microwave Bracket Screws Failure to do so could result in death or electrical shock.
  • Page 23 Slide the plastic grommet and the micro- REASSEMBLY NOTE: When you reinstall the wave oven out of the oven cabinet and set microwave oven in the oven cabinet, push it the oven on your work surface. straight in so that the two rear alignment screws fit into the holes in the rear of the microwave oven.
  • Page 24: Removing The Primary, Secondary, & Monitor Interlock Switches And The Air Pressure Relief Valve

    REMOVING THE PRIMARY, SECONDARY, & MONITOR INTERLOCK SWITCHES AND THE AIR PRESSURE RELIEF VALVE c) Remove the wires from the switch ter- WARNING minals. Electrical Shock Hazard Disconnect power before servicing. Replace all panels before operating. Air Pressure Failure to do so could result in death or Relief Valve electrical shock.
  • Page 25 To remove the primary and monitor d) Disconnect the wires from the primary interlock switches: and monitor switch terminals. A switch is mounted on both sides of the bracket. a) Pull the microwave oven out of the oven cabinet approximately 6˝ so you can access the interlock switches (see pages 2-8 &...
  • Page 26: Removing The Grill Thermal Fuse And The Grill Element Assembly

    REMOVING THE GRILL THERMAL FUSE AND THE GRILL ELEMENT ASSEMBLY To remove the grill thermal fuse: WARNING a) Disconnect the two wires from the ter- minals. Electrical Shock Hazard Grill Thermal Disconnect power before servicing. Fuse Screws Replace all panels before operating. Failure to do so could result in death or electrical shock.
  • Page 27 b) Remove the two T-10 torx screws from c) Slide the grill element assembly to the the bracket over the left end of the grill left and release the slots from the lock- element assembly and raise the bracket ing tabs. NOTE: It may take a moderate slightly.
  • Page 28: Removing The Convection Temperature Sensor, The Halogen Lamp, And The Cavity Thermal Fuse

    REMOVING THE CONVECTION TEMPERATURE SENSOR, THE HALOGEN LAMP, AND THE CAVITY THERMAL FUSE To remove the convection temperature WARNING sensor: a) Remove the two T-10 torx screws from Electrical Shock Hazard the plate over the left end of the grill element bracket and remove the plate.
  • Page 29 To remove the halogen lamp: To remove the cavity thermal fuse: a) Unclip the wire retainer and remove it. a) Disconnect the wires from the termi- nals. b) Remove the T-10 torx screw from the cavity thermal fuse. Cavity Thermal Fuse Screw Wire Retainer b) Remove the lamp from the holder and...
  • Page 30: Removing The Convection Thermal Fuse, Convection Element, And Convection Fan Motor

    REMOVING THE CONVECTION THERMAL FUSE, CONVECTION ELEMENT, AND CONVECTION FAN MOTOR To remove the convection element: WARNING a) Disconnect the wires from the termi- nals. Electrical Shock Hazard b) Remove the four T-10 torx screws from Disconnect power before servicing. the mounting cover.
  • Page 31 To remove the convection fan motor: d) Remove the three T-10 torx screws from the insulation cover and remove a) Remove the convection element (see the cover and insulation. step 5). NOTE: It is not necessary to Insulation remove the convection element to re- Insulation Cover move the fan motor.
  • Page 32: Removing The Cooling Fan Motor & Air Vent Solenoid

    REMOVING THE COOLING FAN MOTOR & AIR VENT SOLENOID Position the unit with the high voltage WARNING component side facing you. Pull the cooling fan assembly out of the Electrical Shock Hazard unit. Disconnect power before servicing. To remove the cooling fan motor: Replace all panels before operating.
  • Page 33 d) Remove the T-10 torx screws from the The microwave oven component described on fan motor and remove the motor from this page is shown below. the housing. Fan Motor Torx Screws Air Vent Solenoid 10. To remove the air vent solenoid: a) Disconnect the wires from the termi- nals.
  • Page 34: Removing The Magnetron Thermal Fuse And The Magnetron

    REMOVING THE MAGNETRON THERMAL FUSE AND THE MAGNETRON To remove the magnetron thermal fuse: WARNING a) Remove the wires from the thermal fuse cover clips. Electrical Shock Hazard b) Remove the T-10 torx screw from the Disconnect power before servicing. thermal fuse cover and remove the Replace all panels before operating.
  • Page 35 To remove the magnetron: d) Disconnect the two filament wires from the magnetron terminals. a) Remove the magnetron thermal fuse (see step 5). Filament Wires b) Remove the T-16 torx screws (1 each) from the left and right air ducts. Left Air Duct Screw Right Air Duct Screw Screw (1 of 4)
  • Page 36: Removing The High Voltage Transformer

    REMOVING THE HIGH VOLTAGE TRANSFORMER Remove the T-16 torx screw from the air WARNING duct, unclip the two wires, and remove the duct. Screw Air Duct Wire Clip Electrical Shock Hazard Disconnect power before servicing. Replace all panels before operating. Failure to do so could result in death or electrical shock.
  • Page 37 High Voltage Transformer Remove the two T-10 torx screws from the high voltage transformer, then pull the two base tabs out of the chassis, and remove the high voltage transformer. Base Tab Screws 2-23...
  • Page 38: Removing The Line Fuse & Fuseholder, The High Voltage Rectifier

    REMOVING THE LINE FUSE & FUSEHOLDER, THE HIGH VOLTAGE RECTIFIER, & HIGH VOLTAGE CAPACITOR To remove the line fuse and fuseholder: WARNING a) Remove the line fuse from the fuse- holder. Electrical Shock Hazard b) Remove the wires from the fuseholder Disconnect power before servicing.
  • Page 39 c) Unclip the wires from the mounting e) Remove the high voltage rectifier lead bracket clip. from the high voltage capacitor termi- nal. f) Remove the mounting screw from the capacitor clamp and remove the high voltage rectifier and capacitor from the Bracket Arm mounting bracket.
  • Page 40: Removing The Turntable Motor

    REMOVING THE TURNTABLE MOTOR Remove the T-10 torx screws from the WARNING turntable motor and remove the motor. Wires Electrical Shock Hazard Disconnect power before servicing. Replace all panels before operating. Failure to do so could result in death or electrical shock.
  • Page 41: Removing The Oven Door Handle & Front Door Glass

    REMOVING THE OVEN DOOR HANDLE & FRONT DOOR GLASS CAUTION: When you remove the front door WARNING glass and handle in the next step, be careful when you remove the two screws that hold the assembly together. Hold the door open while Electrical Shock Hazard you remove the screws;...
  • Page 42: Removing The Oven Door & The Inner Glass

    REMOVING THE OVEN DOOR & THE INNER GLASS Remove the T-10 torx shoulder screws WARNING from the door stops (1 on each side). T-10 Torx Electrical Shock Hazard Shoulder Screw Right Door Stop Disconnect power before servicing. Replace all panels before operating. Failure to do so could result in death or electrical shock.
  • Page 43 Remove the four indicated T-10 torx screws Pull the brackets out of the oven slots and from the bottom of the door brackets. remove the door assembly from the micro- wave. Door Brackets If you are replacing the oven door and inner glass assembly, remove the front door glass and the handle (see page 2-27 for the procedure).
  • Page 44 — NOTES — 2-30...
  • Page 45: Component Testing

    COMPONENT TESTING Before testing any of the components, perform • Check all connections before replacing com- the following checks: ponents, looking for broken or loose wires, failed terminals, or wires not pressed into • The most common cause for control failure is connectors far enough.
  • Page 46: The Low Voltage Transformer & Light Power Supply

    THE LOW VOLTAGE TRANSFORMER & LIGHT POWER SUPPLY WARNING WARNING Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all panels before operating. Replace all panels before operating. Failure to do so could result in death or Failure to do so could result in death or electrical shock.
  • Page 47: The Blower & Convection Fan Motors

    THE BLOWER & CONVECTION FAN MOTORS WARNING WARNING Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all panels before operating. Replace all panels before operating. Failure to do so could result in death or Failure to do so could result in death or electrical shock.
  • Page 48: The Convection Temperature Sensor

    THE CONVECTION TEMPERATURE SENSOR Refer to page 2-14 for the procedure for servic- WARNING ing the convection temperature sensor. Disconnect the electrical power to the Electrical Shock Hazard microwave oven. Disconnect power before servicing. Disconnect the convection temperature Replace all panels before operating. sensor connector from the oven control board.
  • Page 49: The Cavity, Grill, Convection, & Magnetron Thermal Fuses

    THE CAVITY, GRILL, CONVECTION, & MAGNETRON THERMAL FUSES Refer to the cavity thermal fuse (page 2-14), WARNING the grill thermal fuse (page 2-12), the convec- tion thermal fuse (page 2-16), and the magne- tron thermal fuse (page 2-20) for the servicing Electrical Shock Hazard procedures.
  • Page 50: The Convection Element & Grill Element Assembly

    THE CONVECTION ELEMENT & GRILL ELEMENT ASSEMBLY WARNING WARNING Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all panels before operating. Replace all panels before operating. Failure to do so could result in death or Failure to do so could result in death or electrical shock.
  • Page 51: The Line Fuse, High Voltage Rectifier, & High Voltage Capacitor

    THE LINE FUSE, HIGH VOLTAGE RECTIFIER, & HIGH VOLTAGE CAPACITOR b) Set the ohmmeter to the R x 1K scale. WARNING c) Touch the positive ohmmeter lead to the anode lead of the diode and the negative lead to the cathode. The meter Electrical Shock Hazard should indicate continuity.
  • Page 52: The Air Vent Solenoid & Interlock Switches

    THE AIR VENT SOLENOID & INTERLOCK SWITCHES WARNING WARNING Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all panels before operating. Replace all panels before operating. Failure to do so could result in death or Failure to do so could result in death or electrical shock.
  • Page 53: The High Voltage Transformer & Magnetron

    THE HIGH VOLTAGE TRANSFORMER & MAGNETRON WARNING WARNING Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all panels before operating. Replace all panels before operating. Failure to do so could result in death or Failure to do so could result in death or electrical shock.
  • Page 54: Control Panel Resistor

    CONTROL PANEL RESISTOR WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all panels before operating. Failure to do so could result in death or electrical shock. Disconnect the electrical power to the microwave oven. Remove the control panel from the micro- wave oven (see page 2-3 for the proce- Connector dure).
  • Page 55: Diagnosis & Troubleshooting

    DIAGNOSIS & TROUBLESHOOTING • The failure code is displayed on the side of FAILURE / ERROR DISPLAY CODES the control that is hidden behind the mem- • Always disconnect power before touching brane switch. The control will need to be any internal parts in the oven.
  • Page 56: Electronic Oven Control Pinouts

    ELECTRONIC OVEN CONTROL PINOUTS NOTE: The input and output pins for the lower oven functions are not used. FUNCTION COLOR FUNCTION COLOR FUNCTION COLOR CONTROL BOARD POWER 0.045˝ SQUARE POST LOWER OVEN CONVECTION RING AND P7-6 UPPER OVEN BLOWER INNER BROIL ELEMENT CONNECTOR P15-1 L1 >...
  • Page 57: Microwave Oven Power Output Test

    MICROWAVE OVEN NOTE: Less than a 20° F (11.1° C) tempera- ture rise may indicate an operating voltage of POWER OUTPUT TEST less than 110 volts or a low power output from The power output of the magnetron can be the magnetron.
  • Page 58: Troubleshooting Chart

    TROUBLESHOOTING CHART PROBLEM CAUSE • The door is not firmly closed and latched. The microwave oven will • The EASY MINUTE START keypad was not touched. not run. • The directions were not exactly performed. • An earlier programmed operation is still running. •...
  • Page 59: Wiring Diagrams & Strip Circuits

    WIRING DIAGRAMS & STRIP CIRCUITS WIRING DIAGRAM Models KBHC109J & KBHC179J WIRE HARNESS SCHEMATIC T.O.D. HEATING LIGHT (RESETTABLE) ELEMENT NOTES: DOTS INDICATE CONNECTIONS OR SPLICES. AC DRIVE THERMAL FUSE T.O.D. SOLENOID MOTOR (NON-RESETTABLE ONE TIME) CIRCUIT SHOWN IN STANDBY/OFF MODE WITH MICROWAVE OVEN DOOR OPEN.
  • Page 60: Wiring Diagram

    WIRING DIAGRAM Models KBMC140H & KBMC147H WIRE HARNESS SCHEMATIC T.O.D. HEATING (RESETTABLE) LIGHT ELEMENT NOTES: DOTS INDICATE CONNECTIONS OR SPLICES. AC DRIVE THERMAL FUSE T.O.D. SOLENOID MOTOR (NON-RESETTABLE ONE TIME) CIRCUIT SHOWN IN STANDBY/OFF MODE WITH MICROWAVE OVEN DOOR OPEN. GROUND (CHASSIS) ENCLOSED RELAY COIL...
  • Page 61: Strip Circuits

    STRIP CIRCUITS Models KBMC140H & KBMC147H MICROWAVE FULL POWER / MICROWAVE VARIABLE POWER LIGHT POWER SUPPLY HALOGEN P10-1 MICROWAVE J1-5 CAVITY LIGHT COOLING (MAG) FAN P10-4 P10-2 MONITOR TURNTABLE SWITCH J1-4 MAGNETRON AND PRIMARY COMPONENTS INTERLOCK CAVITY MAGNETRON 900W OUTPUT SWITCH FUSE T.O.D.
  • Page 62 MICROWAVE MANUAL CRISP LIGHT POWER SUPPLY HALOGEN P10-1 MICROWAVE J1-5 CAVITY LIGHT COOLING (MAG) FAN P10-4 P10-2 MONITOR TURNTABLE SWITCH J1-4 MAGNETRON AND PRIMARY COMPONENTS INTERLOCK CAVITY MAGNETRON 900W OUTPUT SWITCH FUSE T.O.D. T.0.D. J1-1 P8-1 P8-2 SECONDARY INTERLOCK SWITCH DOOR SHOWN IN CLOSED POSITION...
  • Page 63: Tech Tips

    These parts will fit right and work Call the KitchenAid Consumer Assistance Cen- right, because they are made with the same ter toll free, at precision used to build every new KitchenAid 1-800-422-1230 appliance. If you need assistance or service in Canada:...
  • Page 64 If you need assistance or service, first see the “Diagnosis & Troubleshooting” section of this book. After checking “Diagnosis & Troubleshooting,” additional help can be found by checking the “Requesting Assistance or Service” section. In the U.S.A., call our Consumer Assistance Center at: 1-800-422-1230. In Canada, call KitchenAid Canada at: 1-800-461-5681 or 1-800-807-6777.
  • Page 65 — NOTES —...
  • Page 66 — NOTES —...

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