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KitchenAid KAC-48 Technical Education

Microwave oven / hood combination
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KAC-48
TECHNICAL EDUCATION

MICROWAVE OVEN /

HOOD COMBINATION
MODEL: KHMS1850S
JOB AID 4317414

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  Summary of Contents for KitchenAid KAC-48

  • Page 1: Microwave Oven

    KAC-48 TECHNICAL EDUCATION MICROWAVE OVEN / HOOD COMBINATION MODEL: KHMS1850S JOB AID 4317414...
  • Page 2 FORWARD This KitchenAid Job Aid, “Microwave Oven / Hood Combination” (Part No. 4317414) provides the In-Home Service Professional with information on the installation, operation, and service of the Microwave Hood Combination. For specific information on the model being serviced, refer to the Use and Care Guide or Tech Sheet provided with the Microwave Oven / Hood Combina- tion.
  • Page 3: Table Of Contents

    TABLE OF CONTENTS Page GENERAL ............. . 1-1 Microwave Oven Safety.
  • Page 4 Page COMPONENT TESTING ........... 5-1 Thermostats .
  • Page 5: General

    GENERAL MICROWAVE OVEN SAFETY Your safety and the safety of others are very important. We have provided many important safety messages in this manual and on your appliance. Always read and obey all safety messages. This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and others.
  • Page 6: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure 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: 1.
  • Page 7: Model And Serial Number Designations

    MODEL NUMBER HM S 18 5 0 S BL 0 MODEL NUMBER PRODUCT GROUP K = KITCHENAID BRAND PRODUCT IDENTIFICATION BH = BUILT-IN HIGH SPEED OVEN BM = BUILT-IN MICROWAVE CM = COUNTERTOP MICROWAVE HM = MICROWAVE HOOD HS = HIGH SPEED...
  • Page 8: Model And Serial Number Label And Tech Sheet Locations

    MODEL AND SERIAL NUMBER LABEL AND TECH SHEET LOCATIONS The Model/Serial Number label and Tech Sheet locations are shown below. Model/Serial Number Label WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock.
  • Page 9: Specifications

    SPECIFICATIONS Model KHMS1850SBL/WH/SS Control System Timer Electronic Limits 99 min. 99 sec. Scale Linear (Digital) Operation Touch Control, Pads TBD Display 5 + 2 Digit - Blue-Green Clock Independent Minute Timer Stage Cooking Yes (3) In-Use Reprogramming More/Less Function Yes - Hidden “Cook Power” Button Keypad Disable/Control Lockout Mode Yes - Press “OFF/Cancel”...
  • Page 10 Ventilation System Type Convertible Recirculation or Exhaust Vertical/Horizontal Recirculation CFM Out Exhaust CFM Out Touch Control 4-Speed Auto On/High Speed Yes: 140°F / 60°C Damper Grease Filter Yes (2) Charcoal Filter Yes - Behind Mesh Filter Under Unit Blower Type Twin Squirrel Cage Shipped Recirculation Mode...
  • Page 11: Installation Information

    INSTALLATION INFORMATION INSTALLATION REQUIREMENTS INSTALLATION DIMENSIONS PRODUCT DIMENSIONS NOTE: The grounded 3 prong outlet must be inside the upper cabinet. See “Electrical Re- quirements,” page 2-2. 30" (76.2 cm) min. 30" (76.2 cm) typical* 12" (30.5 cm) min. 14" (35.6 cm) max. 66"...
  • Page 12: Electrical Requirements

    ELECTRICAL REQUIREMENTS GROUNDING INSTRUCTIONS WARNING • For all cord connected appliances: The microwave oven must be grounded. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current. The microwave oven is equipped with a cord having a ground- Electrical Shock Hazard ing wire with a grounding plug.
  • Page 13: Installation Instructions

    INSTALLATION INSTRUCTIONS ROTATE BLOWER MOTOR Rotate blower motor end over end. The microwave oven is set for recirculation installation. For wall or roof venting, changes must be made to the venting system. NOTE: Skip this section if you are using recir- culation installation.
  • Page 14: Install The Microwave Oven

    Roof Venting Installation Only Reattach damper plate. Make sure tabs at top and back of damper plate are in- Repeat Step 1 from “Wall Venting Instal- serted fully into their respective slots in lation Only on page 13.” the microwave oven. Repeat Step 2 from “Wall Venting Instal- lation Only.”...
  • Page 15 Rotate the microwave oven up toward upper cabinet. NOTE: If venting through the wall, make sure the damper assembly fits easily into the vent in the wall cutout. Push the microwave oven against mount- ing plate and hold in place. NOTE: If microwave oven does not need to be adjusted, skip steps 7-9.
  • Page 16 ACCESSORIES For Roof Venting Installation Only Insert damper assembly through the Filler Panel Kits are available from your cabinet cutout so that the long tab of the dealer to use when installing this microwave damper assembly slides under the raised oven in a 36˝...
  • Page 17: Product Operation

    PRODUCT OPERATION PARTS AND FEATURES This manual may cover several different mod- The appearance of your particular model els. The model you have purchased may have may differ slightly from the illustrations in this some or all of the features shown here. manual.
  • Page 18: Microwave Oven Control

    MICROWAVE OVEN CONTROL When the microwave oven is in use, the dis- play shows cooking power, quantities, weights and/or prompts. When the microwave oven is SENSOR AUTO REHEAT not in use, the display shows the time of day DEFROST 1 2 3 ENTER COOK TIMER...
  • Page 19 To Remove: To Set: Touch Clock. Touch Timer. Touch 0. If no action is taken after 1 minute, the dis- Touch Clock. play will return to the time-of-day mode. The time will disappear, and “:” will appear on Touch the number pads to set the length the display.
  • Page 20 To Turn Vent Fan On/Off: Repeatedly touch DEMO MODE the Vent Fan 4 Speeds pad to cycle through The Demo Mode is ideal for learning how to the four speeds, and then turn the fan off. use the microwave oven. When set, functions can be entered without actually turning on the COOKTOP LIGHT magnetron.
  • Page 21: Component Access

    COMPONENT ACCESS This section instructs you on how to service each component inside the Microwave Oven/Hood Combination. The components and their locations are shown below. COMPONENT LOCATIONS A. Cavity Thermostat #3—opens @ 329ºF I. Magnetron Thermostat—opens @ S. Touch Panel (165ºC), closes at –31ºF (–35ºC) 257ºF (125ºC), closes @ 185ºF (85ºC) T.
  • Page 22: Removing A Hood Lamp Socket And Bottom Cover

    REMOVING A HOOD LAMP SOCKET AND BOTTOM COVER WARNING Screw Lamp Plate Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. Unplug microwave oven or disconnect Lamp Holders power.
  • Page 23 To remove the bottom cover: a) Disconnect the wire connector from the turntable motor terminals. b) Unlatch and disconnect the 6-hole power connector from the microwave oven and unclip the wires from the standoff. c) Unhook the bottom cover assembly from the microwave oven and remove Turntable Motor Connector...
  • Page 24: Removing The Cabinet

    REMOVING THE CABINET Remove the five flat-head screws from WARNING the top of the cabinet. 5 Top Cabinet Screws Electrical Shock Hazard Disconnect power before servicing. Remove the following screws from the cabinet: Replace all parts and panels before operating. a) One right side screw.
  • Page 25: Removing Cavity Thermostat #3 And The Humidity Sensor

    REMOVING CAVITY THERMOSTAT # AND THE HUMIDITY SENSOR WARNING 2 BU Cavity Thermostat #3 Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. Locking Tabs To remove the humidity sensor: Unplug microwave oven or disconnect power.
  • Page 26 b) Unhook and lift the locking arm on the e) Disconnect the 3-wire humidity sen- cavity thermostat and humidity sensor sor cable (red, white and black) from holder from the slot in the oven. humidity sensor connector P1. c) Unhook the cavity thermostat and hu- midity sensor holder from the left side of the top cover, and move the holder to the left.
  • Page 27 g) Remove the two screws and the end REASSEMBLY NOTE: When you reinstall the of the green ground wire from the hu- humidity sensor, make sure that you position midity sensor. the sensor cable facing down and the green ground wire at the indicated screw. h) Pull the end of the humidity sensor cable from under the top cover.
  • Page 28: Removing The Hood Exhaust Fan Motor

    REMOVING THE HOOD EXHAUST FAN MOTOR Remove the two hood exhaust fan motor WARNING screws from the rear panel. Unlatch and disconnect the hood exhaust fan motor wire connector from the oven. Wire Connector Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating.
  • Page 29: Removing The Cavity Lamp Holder, The Stirrer Motor And Cavity Thermostat #2

    REMOVING THE CAVITY LAMP HOLDER, THE STIRRER MOTOR, AND CAVITY THERMOSTAT # WARNING Top Subpanel Rear Screws Electrical Shock Hazard Disconnect power before servicing. Lift the right-rear air guide and unhook it Replace all parts and panels before from the right-front air guide. operating.
  • Page 30 Lift the rear of the top subpanel assembly, Lamp Holder Base pull it back slightly, raise the front, and re- move the wires from the three indicated clips. Connectors Bulb 3 Wire Clips Remove Silastic ™ 12. To remove the stirrer motor and cavity thermostat #: a) Remove the two screws from the stir- rer motor.
  • Page 31 d) Open the microwave oven door. REASSEMBLY NOTES: e) Using a putty knife, pry the stirrer mo- • Be sure to reinstall the stirrer fan blade tor cover, and the plastic nails, off the on the motor shaft before you reinstall the top of the oven cavity.
  • Page 32: Removing Cavity Thermostat #1, The Motor Capacitor, The Ac Line Filter And The Power Supply Cord

    REMOVING CAVITY THERMOSTAT #, THE MOTOR CAPACITOR, THE AC LINE FILTER AND THE POWER SUPPLY CORD To remove cavity thermostat #: WARNING a) Disconnect the two wire connectors from the cavity thermostat terminals. b) Remove the two cavity thermo- stat bracket nuts and remove the thermostat.
  • Page 33 To remove the AC line filter: To remove the power supply cord: a) Discharge the AC line filter by touch- a) Discharge the AC line filter by touching ing the leads of a 20,000 Ω resistor the leads of a 20,000 Ω resistor from from each of the filter leads to chassis each of the filter leads to the chassis ground.
  • Page 34: Removing The Electronic Control Board And The Touch Control Assembly

    REMOVING THE ELECTRONIC CONTROL BOARD AND THE TOUCH CONTROL ASSEMBLY Disconnect the 3-wire humidity sen- WARNING sor cable (red, white and black) from humidity sensor connector P1. Electrical Shock Hazard Disconnect power before servicing. Humidity Sensor Connector P1 Replace all parts and panels before operating.
  • Page 35 10. To remove the electronic control board: 11. To remove the touch control assembly: a) Lift the locking arm on ribbon cable a) Remove the electronic control board connector P5 and pull the cable out of (see step 10). the connector. b) Release the two locking tabs and remove b) Remove the four screws from the elec- the metal shield from the control panel.
  • Page 36: Removing The Primary, Secondary And Monitor Interlock Switches

    REMOVING THE PRIMARY, SECONDARY, AND MONITOR INTERLOCK SWITCHES WARNING c) While pulling out on the switch, pry up on the locking tab so that it clears the switch. d) Repeat the previous step for the other pin and locking tab, and slide the switch off the holder pins.
  • Page 37 To remove the primary or secondary interlock switch: a) Open the microwave oven door. Orange (NC2) b) Remove the screw from the front of Brown and White the chassis for the switch you are re- moving. Black (C1) c) Depending on the switch you are re- moving, rotate the switch holder lock- ing cam in the direction of the arrow.
  • Page 38: Removing The Line Fuse Holder And The Magnetron Thermostat

    REMOVING THE LINE FUSE HOLDER AND THE MAGNETRON THERMOSTAT To remove the line fuse holder: WARNING a) Remove the line fuse from the fuse holder. b) Disconnect the two wire connectors from the fuse holder terminals. Line Fuse Electrical Shock Hazard Disconnect power before servicing.
  • Page 39: Removing The Cooling Fan Motor And The Exhaust Fan Thermostat

    REMOVING THE COOLING FAN MOTOR AND THE EXHAUST FAN THERMOSTAT WARNING GY and WH WIres Pull Electrical Shock Hazard Disconnect power before servicing. Cooling Fan Motor Replace all parts and panels before Mounting Screws operating. Failure to do so can result in death or electrical shock.
  • Page 40: Removing High-Voltage Diode And The Power Resistor

    REMOVING THE HIGH-VOLTAGE DIODE AND THE POWER RESISTOR To remove the high voltage diode: WARNING a) Discharge the high voltage capacitor by touching the leads of a 20,000 Ω re- sistor from each of the capacitor leads to the chassis ground. b) Disconnect the high voltage diode con- nector from the high voltage capacitor Electrical Shock Hazard...
  • Page 41: Removing The High-Voltage Capacitor And The Magnetron

    REMOVING THE HIGH-VOLTAGE CAPACITOR AND THE MAGNETRON Remove the cooling fan motor from the WARNING oven (see page 4-19 for the procedure). Unclip the wiring from the front of the cool- ing fan motor shroud. Remove the two top, front, and bottom screws (6 total) from the fan shroud.
  • Page 42 Cut the foam tape at the three indicated 12. Slide the cooling fan motor shroud out of locations on the side of the cooling fan the oven. shroud. 13. To remove the high-voltage capaci- tor: Disconnect the red and white wires from the high-voltage transformer terminals.
  • Page 43 c) Disconnect the wire connectors from 14. To remove the magnetron: the high-voltage capacitor terminals. a) Discharge the high voltage capacitor d) Loosen the bracket screw, slide the high- by touching the leads of a 20,000 Ω re- voltage capacitor out of the bracket, and sistor from each of the capacitor leads remove the capacitor.
  • Page 44: Removing The High-Voltage Transformer

    REMOVING THE HIGH-VOLTAGE TRANSFORMER Discharge the high-voltage capacitor by WARNING touching the leads of a 20,000 Ω resistor from each of the capacitor leads to chas- sis ground. Disconnect the high-voltage transformer wires from the following locations: a) The red wire from the magnetron fila- ment terminal.
  • Page 45: Removing The Turntable Motor

    REMOVING THE TURNTABLE MOTOR Remove the ten screws from the bottom WARNING cover and lower the cover. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or Screw (1 of 10) Bottom Cover Assembly electrical shock.
  • Page 46: Removing The Oven Door And Components

    REMOVING THE OVEN DOOR AND COMPONENTS Place the oven door front side down on a WARNING padded surface. Remove the choke screws from the door frame. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before Choke Screws operating.
  • Page 47 Starting at the top edge of the door near To remove the door switch actuators from the center and working clockwise, use a the choke, remove the screw from each putty knife, and pry the latching tabs of actuator. the choke out of the door frame slots. Lift the choke as you release the tabs so they do not snap back into the slots.
  • Page 48 — NOTES — 4-...
  • Page 49: Component Testing

    COMPONENT TESTING IMPORTANT: Before performing any tests on • Conduct a microwave energy test af- the microwave oven, be sure to observe the ter performing any tests or repairs to the following: microwave oven. • Unplug microwave oven or disconnect •...
  • Page 50: Humidity Sensor

    WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. HOOD EXHAUST FAN MOTOR HUMIDITY SENSOR Refer to page 4-5 for the procedure for access- ing the humidity sensor.
  • Page 51: Stirrer Motor

    WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. STIRRER MOTOR MOTOR CAPACITOR Refer to page 4-12 for the procedure for ac- cessing the motor capacitor. Refer to page 4-9 for the procedure for access- ing the stirrer motor.
  • Page 52: Ac Line Filter

    WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. DOOR INTERLOCK SWITCHES AC LINE FILTER Refer to page 4-16 for the procedure for accessing the door interlock switches.
  • Page 53: Line Fuse

    WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. LINE FUSE COOLING FAN MOTOR Refer to page 4-18 for the procedure for ac- cessing the line fuse.
  • Page 54: High-Voltage Diode

    WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. POWER RESISTOR HIGH-VOLTAGE DIODE H.V. diode Refer to page 4-20 for the procedure for ac- Refer to page 4-20 for the procedure for ac- cessing the high-voltage (H.V.) diode.
  • Page 55: High-Voltage Capacitor

    WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. HIGH-VOLTAGE CAPACITOR MAGNETRON H.V. Capacitor Filament Terminals Refer to page 4-21 for the procedure for ac- Refer to page 4-21 for the procedure for ac- cessing the high-voltage capacitor.
  • Page 56: High-Voltage Transformer

    WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. HIGH-VOLTAGE TRANSFORMER TURNTABLE MOTOR Filament Wire (OR/RD) Primary Terminals Secondary Wires (WH and RD) Refer to page 4-25 for the procedure for ac- cessing the turntable motor.
  • Page 57: Diagnostics And Troubleshooting

    DIAGNOSTICS AND TROUBLESHOOTING PRIMARY, SECONDARY, AND MONITOR INTERLOCK SWITCH CHECKOUT PROCEDURE Switch Check By Door Open Door Closed Primary 1. Unplug microwave oven or disconnect power. Interlock 2. Disconnect the wires at the Primary Interlock Switch. 3. Check from the common terminal (black wire) to the normally open terminal (brown/white wires).
  • Page 58: Failure Code Indications

    FAILURE CODE INDICATIONS NOTE: Many of the problems listed in the After one minute, plug in microwave oven or chart below may be solved by power cycling: reconnect power. unplug microwave oven or disconnect power. Display Likely Failure Condition Recommended Repair Procedure Flashing Power failure After a power failure, the colon “:”...
  • Page 59: Touch Panel And Electronic Control Test

    TOUCH PANEL AND ELECTRONIC Release the CANCEL/OFF button and close the door. CONTROL TEST After pressing each button on the control The microwave hood combination is provided panel, “8” will appear in the display to in- with a self-diagnostic routine that can be ac- dicate that the circuits are complete and cessed through the touch keypad.
  • Page 60: Microwave Oven Power Output Test

    MICROWAVE OVEN POWER OUTPUT TEST Place 8 oz (250 mL) of lukewarm water in NOTE: If the water takes longer than 2 min- the center of the microwave oven. utes to heat, this may indicate either the oper- ating voltage is lower than 110 volts or there is Operate on HIGH power level for 2 min- a problem with the microwave oven.
  • Page 61: Wiring Diagram And Strip Circuits

    WIRING DIAGRAM AND STRIP CIRCUITS WIRING DIAGRAM R / W...
  • Page 62: Strip Circuits

    STRIP CIRCUITS MICROWAVE COOKING Electronic Control L.V. Transformer 5100 Fuse Magnetron 4201 Thermostat Secondary Fuse Cavity High Voltage MW Relay Interlock Thermostat 3 20 Amp System Filter Switch 4903 Cavity Primary Thermostat 2 Turntable Interlock TTM Relay Motor Switch 4906 Cavity Thermostat 1 Cooling...
  • Page 63 HOOD EXHAUST FAN TURNS ON (SPEEDS 4 AND 3 MANUALLY) Electronic Control Cavity Cavity Fuse Thermostat 1 Fuse L.V. Thermostat 3 Filter Filter 20 Amp 4201 Transformer 5100 Cavity Thermostat 2 HF Triac 7103 Hood Exhaust Motor Fan Motor HF Relay HF Relay Capacitor 4905...
  • Page 64: Cooktop Light On High

    DOOR OPEN—OVEN CAVITY LIGHT IS ON Electronic Control Fuse L.V. Cavity 20 Amp Filter Cavity Transformer Thermostat 1 Thermostat 3 5100 Filter Fuse Cavity 4201 Lamp CL Cavity CL/SM/CF Relay Thermostat 2 4901 Primary Interlock Switch COOKTOP LIGHT ON HIGH Electronic Control Fuse Fuse...
  • Page 65 — NOTES —...
  • Page 66 — NOTES —...
  • Page 67: Product Specifications

    WARRANTY INFORMATION SOURCES IN THE UNITED STATES: FOR PRODUCT SPECIFICATIONS AND WARRANTY INFORMATION, CALL: FOR WHIRLPOOL PRODUCTS: 1-800-253-1301 FOR KITCHENAID PRODUCTS: 1-800-422-1230 FOR ROPER PRODUCTS: 1-800-447-6737 FOR TECHNICAL ASSISTANCE WHILE AT THE CUSTOMER’S HOME, CALL: THE TECHNICAL ASSISTANCE LINE: 1-800-832-7174...