KitchenAid KOMS155MBL Technical Education Download Page 48 | Manualshive

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5-6

Refer to page 4-10 for the procedure for servic-
ing the magnetron.

1.

Unplug microwave oven or disconnect
power.

2.

Discharge the high voltage capacitor
terminals with a 20,000

Ω

resistor to

chassis ground.

3.

Disconnect the wire connectors from the
filament terminals.

4.

Set the ohmmeter to the R x 1 scale.

5.

Touch the ohmmeter test leads to the
filament terminals. The meter should indi-
cate less than 1

Ω

.

6.

Touch one ohmmeter test lead to the
chassis, and the other test lead to each of
the filament terminals. The meter should
indicate infinity (

∞

).

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.

MAGNETRON

Filament Terminals

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Summary of Contents for KOMS155MBL

Page 1: ...TECHNICAL EDUCATION KAC 36 JOB AID 4317340 OVER THE COUNTER MICROWAVE OVEN Model KOMS155MBL ...

Page 2: ...d should be used for training purposes only Always use the Wiring Diagram supplied with the product when servicing the unit GOALS AND OBJECTIVES The goal of this Job Aid is to provide detailed information that will enable the service technician to properly diagnose malfunctions and repair the KitchenAid Over The Counter Microwave Oven The objectives of this Job Aid are to Understand and follow pro...

Page 3: ...en 2 1 THEORY OF OPERATION 3 1 Microwave Operating Sequence 3 1 The Absolute Humidity AH Sensor Circuit 3 4 COMPONENT ACCESS 4 1 Component Locations 4 1 Removing The Cabinet 4 2 Removing The Control Board 4 3 Removing The Door Interlock Switch Assembly 4 4 Removing The Line Fuse And Oven Lamp 4 6 Removing An Accent Or Task Lampholder And The Turntable Motor 4 7 Removing The Humidity Sensor Cavity ...

Page 4: ...ine Fuse 5 4 Cooling Fan Motor 5 4 High Voltage Transformer 5 5 High Voltage Diode 5 5 Magnetron 5 6 DIAGNOSIS TROUBLESHOOTING 6 1 Troubleshooting 6 1 Touch Control Panel Assembly Test 6 2 Key Unit Test 6 3 Relay Test 6 4 Defrost Center Test 6 5 Absolute Humidity AH Sensor 6 6 WIRING DIAGRAMS 7 1 Schematic Diagram 7 1 Wiring Diagram 7 2 Page ...

Page 5: ...portantsafetymessagesinthis JobAidandontheappliance 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 follow the safety alert symbol and either the word DANGER or WARNING These words mean All safety messages will tell you what the potential hazard is tell you how to reduce the cha...

Page 6: ...33A OF Secondary Interlock Switch SZM V01 FA 32 Interlock Monitor Switch SZM VI6 FA 62 or VP 532A OF Oven Lamp Switch SZM V6 FA 31 or VP 331 A OD It is neither necessary nor advisable to attempt measurement of high voltage Attaching the adaptor ground terminal to the wall receptacle cover screw does not ground the appliance unless the cover screw is metal and not insulated and the wall receptacle ...

Page 7: ...trap to a green ground connection point or unpainted metal in the appliance or touchyourfingerrepeatedlytoagreenground connection point or unpainted metal in the appliance Before removing the part from its package touch the antistatic bag to a green ground connection point or unpainted metal in the appliance Avoid touching electronic parts or terminal contacts Handle the electronic control as semb...

Page 8: ...etyproceduresshould be exercised at all times Untrained personnel should not attempt service without a thorough review of test procedures and safety information con tained in this Job Aid WARNING TO SERVICE TECHNICIANS KitchenAid microwave ovens have a monitor ing system designed to assure proper opera tion of the safety interlock systems The monitor switch will immediately cause the oven fuse to ...

Page 9: ...pping or Abuse C Before turning on the microwave power for any service test or inspection within the microwavegeneratingcomponents check the magnetron wave guide or transmis sion line and cavity for proper alignment integrity and connections D Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or a...

Page 10: ...mbly will normally register small emissions but they must be no greater than 4 mw cm2 to allow for measurement uncertainty NOTE Enter leakage readings in space BE FORE and AFTER on the service document All microwave ovens exceeding the emission level of 4 mw cm2 must be reported to Dept of Service for Microwave Ovens immediately and the owner should be told not to use the micro wave oven until it ...

Page 11: ...age high current appliance It is free from danger during ordinaryuse butextremecareshouldbetaken during repair CAUTION Service technicians should remove their watches whenever working close to or re placing the magnetron WARNING Never touch any circuit wiring with your hand or with an insulated tool during opera tion WARNING Never insert a wire nail or any other metal object through the lamp holes...

Page 12: ...NDARD C MICRO CONVECTION CAPACITY SIZE SERIES CONFIGURATION 05 0 5 CU FT 08 0 8 CU FT 10 1 0 CU FT 13 1 3 CU FT 15 1 5 CU FT FEATURES 2 PLUS FEATURES 5 DELUXE FEATURES 6 MICRO CONVECTION 7 MICRO CONVECTION WITH SENSOR S CARRY IN WARRANTY EFFECTIVE 02 96 X IN HOME WARRANTY EFFECTIVE 02 96 YEAR OF INTRODUCTION M 2003 COLOR CODE WH WHITE BL BLACK BT BISCUIT SS STAINLESS STEEL ENGINEERING CHANGE 0 1 2...

Page 13: ...SERIAL NUMBER LABEL AND WIRING DIAGRAM LOCATIONS The Model Serial Number label and Wiring Diagram locations are shown below Model Serial Number Label Location Wiring Diagram Location Inside Right Side Of Cabinet ...

Page 14: ...sor One Touch Yes 1 6 Similar in Size Fresh Vegetable Sensor One Touch Yes Sensor Reheat Yes Warm Hold Up to 30 Minutes Add a Minute Yes Convection Cooking Cycles No Combination Cooking Cycles No Custom Help Features Child Lock Yes Audible Signal Elimination Yes Auto Start Yes Language Weight Selection Yes Pause Door Open Clock Yes Independent Minute Timer Yes Stage Cooking Yes 4 Demo Mode Yes Mor...

Page 15: ...en Cavity 1 Hood EXTERIOR FEATURES Outside Dimensions 23 7 8 W X 14 1 16 H X 15 9 16 D Cabinet Finish Painted Smooth Construction Unitized Chassis with Wrapper Mounting Plate Bottom Finish Painted Steel Smooth Control Door and Grille Construction One Piece Molded Cooktop Light w Touch Control 2 Lamps 30 Watt Easy Access Power Cord Length 3 Feet OTHER SPECIFICATIONS 120V Single Phase 60 Hz 1530 Wat...

Page 16: ...roducts not approved by KitchenAid E Any labor costs during the limited warranty F Repairs to parts or systems resulting from unauthorized modifications made to the appliance G Replacement parts or repair labor costs for units operated outside the United States KITCHENAID OR KITCHENAID CANADA DO NOT ASSUME ANY RESPONSIBILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES Some states or provinces do not a...

Page 17: ... 1 Open the cabinet doors and unplug the power cord from the wall outlet 2 Removethetwocabinetmountingscrews 3 Remove the two screws from the latching arms 4 While supporting the microwave oven pull down on the two latching arms at the bottom of the oven to release them from the mounting panel hooks and remove the oven from the wall Screw Screw Power Plug Latching Arm Latching Arm Screw Screw Hook...

Page 18: ...2 2 NOTES ...

Page 19: ...ower 24 sec 8 sec P 60 60 power 22 sec 10 sec P 50 50 power 18 sec 14 sec P 40 40 power 16 sec 16 sec P 30 30 power 12sec 20 sec P 20 20 power 8 sec 24 sec P 10 10 power 6 sec 26 sec P 0 0 power 0 sec 32 sec NOTE The ON OFF time ratio does not corre spond with the percentage of microwave power because approximately 3 seconds are needed for heating of the magnetron filament Microwave power operatio...

Page 20: ...sistance gradually increases When the re sistance reaches the value set according to the menu supplementary cooking is started The time of supplementary cooking is determined by experimenting with each food category and then sent to the microcomputer for processing The following example shows how the sensor works baked potatoes 1 When baked potatoes are at room tem perature and begin cooking vapor...

Page 21: ...efore using the Sensor Cooking 2 The coil of shut off relay RY1 is energized see the illustration below the oven lamp turntableandcoolingfanmotorsareturned on butthepowertransformerisnotturned on 3 After approximately 16 seconds cook re lay RY2 is energized The power trans former is turned on microwave energy is produced and the first stage is started NOTE The 16 seconds is the cooling time requir...

Page 22: ...hile another in the open vessel Each sensor is provided with the pro tective cover made of metal mesh to protect it from the external airflow With this voltage given switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with resistors R53 R57 Changing the resistance values results in that there is the same poten tial at both the F 3 terminal of t...

Page 23: ...ts and their locations are shown below COMPONENT ACCESS Cavity Temperature Fuse Humidity Sensor Magnetron Temperature Fuse Magnetron Line Fuse Control Board Oven Lamp Cooling Fan Motor HV Diode HV Capacitor HV Transformer Control Panel Part Of Door Turntable Motor Accent Task Lamps Primary Monitor Secondary Door Sensing Interlock Switches ...

Page 24: ...g Replace all parts and panels before operating Failure to do so can result in death or electrical shock WARNING 4 Facing the rear of the unit remove the four rear cabinet screws Top Screw 3 Side Screws 5 Pull the cabinet back and unhook the slots from the chassis tabs at the top and sides Pull the cabinet back far enough to access the power cord connector 6 Unlock the power cord connector with a ...

Page 25: ...tor from CN C d 5 wire connector with red red brown wires from CN A e Connector with 2 gry 2 wht wires at relay RY1 f Connector with 2 blk 2 red wires at relay RY2 Screw 6 Remove the screw from the control board and unclip it from the decorative panel CN C 4 Lift the panel and unhook the side tabs then pull the panel forward as far as the wires will allow RY1 RY2 CN A CN B CN F Screw Locking Clip ...

Page 26: ... mounting screws and starwashersfromthedoorinterlockswitch bracket 6 Unlatch the door interlock switch bracket and remove the switch assembly just far enough to disconnect the following wires from the interlock switch terminals see the photo at the top of the next page a PrimaryInterlockSwitch Redwirefrom the normally closed NC terminal and greenwirefromthenormally open NO terminal b MonitorInterl...

Page 27: ...ch Monitor Interlock Switch Secondary Interlock Switch Red NC Green NO White NO Red NC Gray NO 2 White NC Primary Interlock Switch Monitor Interlock Switch Secondary Interlock Switch Press Down On Locking Arm Turn Switch On Pin And Remove Pin REASSEMBLY NOTE Reinstall the switch assembly bracket and then connect the wires to the switch terminals Use the photo to make sure of your connections ...

Page 28: ...lectrical Shock Hazard Disconnect power before servicing Replace all parts and panels before operating Failure to do so can result in death or electrical shock WARNING 4 To remove the line fuse unsnap it from its holder Line Fuse Oven Lamp 5 To remove the oven lamp a Turn the lampholder counterclockwise and remove it from the chassis b Unscrewthelampfromthelampholder Line Fuse Oven Lampholder Oven...

Page 29: ...ve the bulb from the lampholder c Cut the wires near the lampholder d Splice the wires from the new lampholder to the wiring harness with two twist on connectors Accent Task Lampholders Wiring Harness 4 To remove the turntable motor a Disconnect the 2 wire connector from the motor terminals b Remove the two screws and remove the motor from the bottom of the unit 2 Wire Connector Turntable Motor Re...

Page 30: ... in death or electrical shock WARNING 4 To remove the humidity sensor a Remove the decorative panel and tilt it forward see page 4 3 for the proce dure c Remove the two screws and the green ground wire from the humidity sensor and remove the sensor Left Brace Screw Cavity Temp Fuse Humidity Sensor b Disconnect the 3 wire sensor connec tor red black white wires from the control board at CN F Electr...

Page 31: ...crew and unhook the fuse from the unit b Disconnect the two wire connectors from the fuse terminals REASSEMBLY NOTE Reconnect the wires to the cavity temperature fuse terminals before mounting it to the unit Connector 1 of 2 Cavity Temperature Fuse Screw ...

Page 32: ...or electrical shock WARNING 5 To remove the magnetron temperature fuse a Disconnect the wire connectors from the fuse terminals b Remove the screw from the fuse un hook it from the chassis and remove it 3 Discharge the high voltage capacitor terminals with a 20 000 Ω resistor to chassis ground Magnetron Temperature Fuse Magnetron 4 Carefully lift the adhesive side of the foam pad off the top of th...

Page 33: ... shroud so you can access the left magnetron screws b Disconnect the two wire connectors from the magnetron terminals c Remove the one top and four side screws from the magnetron and re move the magnetron from the unit Top Magnetron Screw 4 Magnetron Screws Shroud Screw Locking Arm 2 Wire Connectors Oven Lamp Shroud ...

Page 34: ...acitor terminals with a 20 000 Ω resistor to chassis ground 4 Position the unit on its back panel 5 Remove the six screws from the bottom panel and tilt the panel down as far as the wiring will allow 6 Removethebottomscrewfromthemount ing bracket for the high voltage capacitor and diode and the cooling fan motor Screw 1 of 6 Bottom Panel 7 Close the bottom panel and hold it closed then position th...

Page 35: ...ew from the ca pacitorbracket andremovethecapacitor 13 To remove the high voltage diode a Remove the mounting screw from the capacitor bracket b Disconnect the diode wire from the magnetron terminal and remove the diode 11 Unhook the top and bottom of the mount ing bracket for the high voltage capacitor diode and the cooling fan motor from the unit and pull it out just far enough to access the cap...

Page 36: ...otor a Disconnect the 2 wire connector from the motor terminals b Pull the fan blade off the motor shaft c Remove the two screws from the motor and remove it from the bracket 2 Wire Connector Cooling Fan Motor Fan Blade Fan Motor Screws ...

Page 37: ...ect the three wires from the high voltage transformer terminals see the photo at the top of the right column 5 Disconnect the high voltage transformer wires from the magnetron and the high voltage capacitor terminals 6 Position the unit on its back panel 7 Remove the six screws from the bottom panel and tilt the panel down as far as the wiring will allow 8 Holdthehighvoltagetransformerinplace and ...

Page 38: ...nect power before servicing Replace all parts and panels before operating Failure to do so can result in death or electrical shock WARNING 11 Wire Connector At CN C 5 Remove the screw from each end of the front trim 6 Lay the unit on its back panel 7 Slide the front trim to the left and unhook it from the chassis then lift the trim off the unit and unhook the control panel cable from its clips 8 C...

Page 39: ... a small bladed screwdriver and pry the hinge covers out of the door Pry Out Top Hinge Cover Pry Out Bottom Hinge Cover 12 Lift the door so that the top and bottom pins are out of the hinge holes and re move the door and control panel Remove Pin From Hinge Remove Pin From Hinge ...

Page 40: ...ure to do so can result in death or electrical shock WARNING 4 Use a putty knife and pry along the bottom outer edge of the door choke to release the clips from the tabs Carefully pull out on the choke as you release the tabs Work counterclockwise around the choke until you are able to remove it Outer Door Panel Choke Inner Door Panel Door Latch Arms Choke Putty Knife 5 Lift the door latch arms an...

Page 41: ...Remove the four screws 2 at the top and 2 at the bottom from the inner door panel 7 Start at the bottom and press to release the locking tabs along the inner door panel while you pull out on the panel Continue around the door in a counterclockwise direction until you are able to remove the panel from the outer door panel 8 Lift the inner door panel off the hinges and remove it Top Inner Door Panel...

Page 42: ...4 20 NOTES ...

Page 43: ...with the microwave oven loaded with a minimum of 275 ml 9 3 oz of water in a microwave safe container Conduct a microwave energy test after per forming any tests or repairs to the micro wave Check that all wire leads are in the correct position before operating the microwave oven Grasp wire connectors when removing the wire leads from microwave parts 3 Set the ohmmeter to the R x 1 scale 4 Touch t...

Page 44: ...g microwave oven or disconnect power 2 Discharge the high voltage capacitor terminals with a 20 000 Ω resistor to chassis ground 3 Disconnect the wires from the capacitor terminals 4 Set the ohmmeter to the R x 1K scale 5 Touch one of the ohmmeter test leads to thechassis andtheothertestleadtoeach of the capacitor terminals The meter should briefly indicate a low resistance and then gradually retu...

Page 45: ...use is defective the ohmmeter will indicate an infinite circuit 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 Refer to page 4 8 for the procedure for servic ing the humidity sensor 1 Unplug microwave oven or disconnect power 2 Disconnect the 3 wire connector from the control b...

Page 46: ...crowave oven or disconnect power 2 Set the ohmmeter to the R x 1 scale 3 Touch the ohmmeter test leads to the ends of the fuse The meter should indi cate a closed circuit 0 Ω Refer to page 4 12 for the procedure for servic ing the cooling fan motor 1 Unplug microwave oven or disconnect power 2 Set the ohmmeter to the R x 1 scale 3 Touch the ohmmeter test leads to the cooling fan motor terminals Th...

Page 47: ...ls before operating Failure to do so can result in death or electrical shock HIGH VOLTAGE DIODE HIGH VOLTAGE TRANSFORMER Filament Terminals Refer to page 4 15 for the procedure for servic ing the high voltage transformer 1 Unplug microwave oven or disconnect power 2 Discharge the high voltage capacitor terminals with a 20 000 Ω resistor to chassis ground 3 Disconnect the filament wires and the wir...

Page 48: ...Set the ohmmeter to the R x 1 scale 5 Touch the ohmmeter test leads to the filament terminals The meter should indi cate less than 1 Ω 6 Touch one ohmmeter test lead to the chassis and the other test lead to each of the filament terminals The meter should indicate infinity WARNING Electrical Shock Hazard Disconnect power before servicing Replace all parts and panels before operating Failure to do ...

Page 49: ...cord and then remove the cabinet see page 4 2 2 Open the oven door and block it open 3 Use a 20 000 Ω 2 Watt resistor to ground and discharge the high voltage capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that the leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord When the ...

Page 50: ...ad produces no signal If the key unit is defective replace the key unit Control Unit The following symptoms indicate a defective control unit Before replacing the control unit perform the Key Unit test to determine if the control unit is faulty 1 In connection with pads a When touching the pads a certain group of pads do not produce a signal b When touching the pads no pads pro duce a signal 2 In ...

Page 51: ... a jumper wire between the pins that correspond to the STOP CLEAR keypad making momentary contact If the control unit responds by clearing with a beep the key unit is faulty and must be replaced If the control unit does not re spond it is faulty and must be replaced If a specific pad does not respond the above method may be used after clearing the control unit to determine if the control unit or a...

Page 52: ...se relays are operated by DC voltage Check the voltage at the relay coil with a DC voltmeter during the microwave cooking op eration If a DC voltage is indicated the relay is defec tive If a DC voltage is not indicated check the diode that is connected to the relay coil If the diode is good the control unit is defective 1 Disconnect the power supply cord 2 Open the oven door and block it 3 To disc...

Page 53: ...ater in the center of the turntable tray in the oven cavity 3 Close the oven door 4 Touch the DEFROST CENTER keypad 5 Touch the number 2 keypad and the num ber 5 keypad 6 Touch the START keypad The oven is now in the Defrost Center cooking mode 7 The oven will operate as follows 8 If the operation is not correct the control unit is probably defective ...

Page 54: ...ps after 5 minutes and ERROR is displayed the AH sensor is normal Check other parts except the AH sensor CHECKING THE INITIAL SENSOR COOKING CONDITION IMPORTANT The oven should be fully as sembled before performing the test procedure 1 The oven should be plugged in at least two minutes before sensor cooking 2 Room temperature should not exceed 95 F 35 C 3 The unit should not be installed in any ar...

Page 55: ...e problem is with the control unit refer to the following section CHECKING THE CONTROL UNIT 1 Disconnect the power supply cord 2 Remove the cabinet see page 4 2 3 Open the door and block it open 4 To discharge the high voltage capacitor wait for 60 seconds 5 Disconnect the sensor connector from the control panel 6 Connectthedummyresistorcircuit seethe illustration on the next page to the sensor co...

Page 56: ... capacitor wait for 60 seconds 14 Disconnect the dummy resistor circuit from the sensor connector of control panel 15 Perform the necessary repairs 16 Reconnect all of the leads that were re movedfromcomponentsduringtestingand repairing 17 Reinstall the cabinet 18 Reconnect the power supply cord 19 Run the oven and check all of the functions 20 Repeat the Water Load Cooking Test on page 6 6 and ma...

Page 57: ... NOTE IF NOT SPECIFIED 1 4W 5 CN B CN F CN A CN C D1 D4 1N4002 RY1 RY2 RY3 RY4 D20 1SS270A D40 1SS270A C21 10 35v SP1 PKM22EPT Q21 KRC243M Q22 KRA101M 1 5 6 4 7 8 a b c d 5 D3 D4 D2 D1 3 8 C1 0 1 50v C51 0 1 50v C2 1000 35v VRS1 10G471K J1 D21 1SS270A D22 1SS270A A 3 A 1 D23 1SS270A A5 D24 1SS270A R4 3 3k R5 680 1w R1 680 1w Q1 2SB1238 C3 10 35v ZD1 HZ16 1 R3 2 4k C 7 C 8 R52 3 57kD 1 4w R51 3 32k...

Page 58: ...M COM MONITOR SWITCH N O N O GRN RED GRN GRN GRN BLK RED N O COM DOOR SENSING SWITCH CN C CN A CN B 1 11 1 1 3 2 1 5 SECONDARY INTERLOCK RELAY POWER UNIT RY1 RY3 RY2 RY4 T1 1 2 RED GRN 1 2 3 4 5 ORG RED BRN CN A TURNTABLE MOTOR FUSE HOLDER WHT BLK GRY BLK RED RED BLK BLK GRY GRY to Base Plate Right COM COM RY2 WHT BLK BLK RED R E D RED RED RED WHT MAGNETRON RED WHT WHT WHT RED ORG RED BRN YLW GRN ...

Page 59: ...R READY TO IDENTIFY YOU AS AN AUTHORIZED SERVICER FOR LITERATURE ORDERS PHONE 1 800 851 4605 IN CANADA FOR PRODUCT SPECIFICATIONS AND WARRANTY INFORMATION CALL 1 800 461 5681 FOR TECHNICAL ASSISTANCE WHILE AT THE CUSTOMER S HOME CALL THE TECHNICAL ASSISTANCE LINE 1 800 488 4791 HAVE YOUR STORE NUMBER READY TO IDENTIFY YOU AS AN AUTHORIZED SERVICER FOR WHIRLPOOL PRODUCTS 1 800 253 1301 FOR KITCHENA...

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