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Page 53

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Wire Diagrams & Schematics

MW24-1100 MICROWAVE OVEN

7-5

#814888 - Revision A - May, 2009

LSI (Large Scale Integration) Unit Circuit

Содержание MW24-1100

Страница 1: ...ral Information 2 Installation Information 5 Controls Operation 6 Component Access Removal 28 Troubleshooting Guide 38 Wiring Diagrams 49 subzero com 800 222 7820 MW24 1100 Standard Microwave Service Manual ...

Страница 2: ... IMPORTANT SAFETY INFORMATION Below are Product Safety Labels used in this manual The Signal Words used are WARNING or CAUTION When reviewing this manual please note these differ ent Product Safety Labels placed at the beginning of certain sections of this manual You must follow the instructions given in the boxes of the Product Safety Labels in order to avoid personal injury and or product damage...

Страница 3: ...warranty parts and labor Limited Parts Only Warranty for the 3rd through 5th year on the following parts Transformer Magnetron Capacitor Rectifier Electronic Control System etc NOTE This warranty only applies to products installed for normal residential use in the United States or Canada NON RESIDENTIAL Warranty Summary Two year TOTAL PRODUCT warranty parts and labor NOTE This warranty only applie...

Страница 4: ...door is open 6 Oven Door with See through Window 7 Ventilation Openings Rear of unit 8 Touch Control Panel NOTE Also see Control Panel Layout on this page 9 Interactive Digital Display NOTE Maximum time dis play is 99 minutes 99 sec onds 10 Coupling a k a Turntable Motor Shaft 11 Waveguide Cover NOTE Do NOT remove 12 Power Supply Cord partial shown 13 Menu Label 1 6 5 4 2 10 11 12 9 7 8 3 13 Figur...

Страница 5: ...to the wall around the front of the microwave oven See Figure 2 4 NOTE Because of the decorative trim design the ductwork assembly and microwave oven need to be positioned toward the right side of the rough in opening For complete built in installation instructions refer to the installation guide and the instructions that accompany the trim kit Ductwork Assembly Decorative Trim Assembly Mounting S...

Страница 6: ...THE PLUG OF THE POWER SUPPLY CORD Free Standing Installation With the microwave free standing on the countertop it is recommended to have counter space on at least one side of the appliance At least 2 inches of clearance must be allowed on the sides top and at the rear of the appliance for air circulation See Figure 2 2 THE INSTALLATION SITE MUST BE EQUIPPED WITH A PROPERLY GROUNDED 3 SLOT RECEP T...

Страница 7: ...d At this time the primary interlock relay RY 2 and secondary interlock switch are in the OFF condition contacts open due to their being normally open contact switches 2 As the door goes to a closed position the monitor switch contacts are first opened and then the door sensing switch and the secondary interlock switch contacts close On opening the door each of these switches operate inversely 3 I...

Страница 8: ...es the 4600 volts in bursts to the magnetron See Figure 3 3 Rectifier Before the capacitor receives the 4600 volts AC the rectifier shunts the negative side of the two 2300 volt AC sine waves to ground so the capaci tor only receives the positive side of the sine waves See Figure 3 3 Magnetron The magnetron converts the high voltage from the volt age doubler circuit to microwave energy then feeds ...

Страница 9: ...initial state when power is supplied 2 Indicator Circuit This circuit consists of 40 segments and 16 com mon electrodes using a Liquid Crystal Display 3 Power Source Circuit This circuit generates voltages necessary in the control unit from the AC line voltage In addition the synchronizing signal is available in order to compose a basic standard time in the clock circuit Symbol Voltage Application...

Страница 10: ...ntrol board circuitry and the interlock switch es if the door is closed See Figure 3 5 If the door is open power will not flow through the interlock switches preventing the units operation If the interlock relay on the control board or one of the interlock switches is bad the oven will be deactivat ed In the event of an electrical short or overheating condition one or more of the fuses will open a...

Страница 11: ...shunts the negative side of the AC voltage to ground The 4600 Volts are then supplied by the capacitor to the mag netron in bursts See Figure 3 8 The magnetron converts the high voltage to microwave energy These microwaves are channeled through the wave guide on the magnetron into the oven cavity where they bounce off of the walls See Figure 3 9 As stat ed before the microwaves travel through the ...

Страница 12: ...N LAMP TURN TABLE MOTOR FAN MOTOR MONITOR SWITCH H V RECTIFIER MAGNETRON SECONDARY INTERLOCK SWITCH TTM OL FM MONITOR FUSE 20A CAVITY TEMP FUSE MAGNETRON TEMP FUSE A1 A2 COM COM COM N O N C N O DOOR SENSING SWITCH RY 1 RY 2 CONTROL UNIT PRIMARY INTERLOCK RELAY B1 B2 GRN POWER TRANSFORMER CAPACITOR 1 0µF AC 2300V AH SENSOR Indicates components with potential above 250 Volts NOTE F1 F2 F3 Figure 3 1...

Страница 13: ...omponents are de energized the oven lamp remains on and the digital read out displays the time still remaining in the cook cycle when the door was opened 7 The monitor switch electrically monitors the operation of the primary interlock switch and secondary interlock relay and is mechanically associated with the door so that it will function in the following sequence a When the door opens from the ...

Страница 14: ...e resistance reaches the value set according to the menu supplementary cooking is started The time of supplementary cooking was determined by experiment with each food category and inputted into the LSI Large Scale Integration circuit Example of how sensor cooking works Potatoes 1 Potatoes at room temperature Vapor is emitted very slowly 2 Heated Potatoes Moisture and humidity is emitted very rapi...

Страница 15: ... cooking When the unit is set to sensor cooking mode a 16 second clearing cycle occurs then the detector circuit begins to function and the LSI observes the initial voltage available at its AN1 terminal With this voltage given switches SW1 to SW5 in the LSI are turned on in such a way that it changes the resistance values in parallel with R107 R111 of IC2 Changing the resistance value creates the ...

Страница 16: ...cally enter Start up Mode Clock Set Mode To set the correct time on the clock follow the steps below 1 Press the TIMER CLOCK key and TO SET KITCHEN TIMER PRESS 1 TO SET CLOCK PRESS 2 will flash on the digital display See Figure 3 17 2 Press the number 2 key and enTer time of day will flash on the digital display See Figure 3 18 3 Enter the time of day by pressing the numbers in sequence For exampl...

Страница 17: ...icrowave oven without energizing the oven One example would be timing the boil of an egg on the stove To start the Timer Clock Mode follow the steps below 1 Press the TIMER CLOCK key and TO SET KITCHEN TIMER PRESS 1 TO SET CLOCK PRESS 2 will flash on the digital display See Figure 3 24 2 Press the number 1 key and enTer time will appear on the digital display See Figure 3 25 3 Enter amount of time...

Страница 18: ...tments would be performed if a recipe calls for a lower power level or if manually defrosting foods To cook at a lower power level follow the steps below 1 Enter desired cooking or defrost time duration For example 4 min utes press the number 4 key then the number 0 key twice See Figure 3 30 and the display will flash 4 00 PRESS START OR PRESS POWER LEVEL 2 Press the POWER LEVEL key in multiple ke...

Страница 19: ...d the microwave oven will automatical ly switch to Time Cook Mode at 100 power for one minute See Figure 3 33 At the end of the cooking time END will flash on the display and the alarm will beep If the microwave is already running in Time Cook Mode or Defrost Mode and the ADD MINUTE key is pressed one minute will be added to the cooking time for every key stroke of the ADD MINUTE key See Figure 3 ...

Страница 20: ... For exam ple 4 minutes press the number 4 key then the number 0 key twice See Figure 3 36 and the display will flash 4 00 PRESS START OR PRESS POWER LEVEL 2 Press the POWER LEVEL key eight times until the display shows 30 PERCENT See Figure 3 37 3 Press the QUICK ON START key to begin defrosting The oven will energize at 30 and the display will show the time as it counts down See Figure 3 38 At t...

Страница 21: ...l energize and the display will flash the time as it counts down along with KEEP WARM See Figure 3 41 At the end of Keep Warm Mode END will flash on the display and the alarm will beep NOTE To interrupt Keep Warm Mode before the countdown time has elapsed press the STOP CLEAR key or open the door If the keep warm process is interrupted the countdown will remain on the display until Keep Warm Mode ...

Страница 22: ...e 3 45 5 Press the KEEP WARM key and ENTER TIME will appear on the display See Figure 3 46 6 Enter desired keep warm time duration For example 30 minutes press the num ber 3 key then the number 0 key three times See Figure 3 47 and the display will flash PRESS start 30 00 7 Press the QUICK ON START key to begin The oven will energize the display will show the countdown starting with first input Se...

Страница 23: ...s press the number 4 key then the number 0 key twice See Figure 3 53 and the display will flash 4 00 PRESS START OR PRESS POWER LEVEL 6 Press the QUICK ON START key and the start time will be appear on the display along with the word START See Figure 3 54 The microwave will now be energized at the time of day specified for the amount of time specified and at the power level specified At the end of...

Страница 24: ... pounds See Figure 3 57 After the weight is entered the display will flash the weight entered along with the words PRESS START 4 Press the QUICK ON START key to start the auto defrost process and the display will show the time as it counts down along with the word DEFROST See Figure 3 58 The microwave oven will stop pause during the auto defrost process the alarm will beep and the display will fla...

Страница 25: ...t fresh soft vegetables or fresh hard vegetables is required before proceeding to step 2 below NOTE If the POULTRY key is pressed an addi tional key stroke to select boneless or bone in is required before proceeding to step 2 below 2 Press the QUICK ON START key In this example RICE SENSOR COOK flashes on the display and the microwave is energized See Figure 3 61 When the sensor in the oven senses...

Страница 26: ...Figure 3 64 3 Press the QUICK ON START key In this example HOT DOGS IN BUNS SENSOR COOK flashes on the display and the microwave is energized See Figure 3 65 NOTE If the STOP CLEAR key is pressed before an Auto Meal Beverage Recipe Cook Mode has finished the display will flash ERROR PRESS CLEAR requiring the STOP CLEAR key to be pressed again NOTE For some Auto Meal Beverage Recipe Cook Modes it i...

Страница 27: ... key is pressed initiating the Child Lock Feature The display will then show the time of day See Figure 3 69 With the Child Lock Feature on all keys on the control panel except the HELP key will be disabled If any of the keys are pressed except the HELP key CHILD LOCK will flash on the display 4 For this example to switch the Child Lock Feature off press the HELP key again and TO UNDO CHILD LOCK P...

Страница 28: ...e keys can be pressed and the display will show or flash the appropriate message If the QUICK ON START key is pressed the microwave oven will function in all respects except that microwave cook ing components will not be energized and the timer on the display will abbreviate the count down from minutes to seconds 3 To exit Demo Mode press the TIMER CLOCK again and TO SET KITCHEN TIMER PRESS 1 TO S...

Страница 29: ...BE DISCONNECTED WHENEVER ACCESS ING AND OR REMOVING COMPONENTS POWERED BY ELECTRICITY OR COMPONENTS NEAR OTHER ELECTRICAL COMPONENTS BEFORE SERVICING THE MICROWAVE OVEN THE CAPACITOR MUST BE DISCHARGED BY SHORTING THE CONNECTING LEAD OF THE RECTIFIER AGAINST THE CHASSIS WITH AN INSULATED SCREW DRIVER FAILURE TO FOLLOW THIS STEP COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH NOTE THE CAPACITOR RE...

Страница 30: ...ap between the choke cover and the door frame Then work the putty knife around the entire choke cover while prying it off of the door panel See Figure 4 2 Latch Head and Latch Spring The latch head spring is attached between a hook on the latch head and a hook on the backside of the door frame The pins on the latch head then fit down into tabs with holes on the backside of the door frame To remove...

Страница 31: ...nd the tabs of the door frame while prying the door panel from the frame See Figure 4 5 NOTE It may be necessary to wedge several putty knives between the door panel and the tabs of the door frame in order to release the panel from the frame Cabinet Case A channel under the front top and front sides of the cab inet case fits over the front flange of the oven cavity frame Tamperproof Torx head scre...

Страница 32: ...ly is slid down so that the hooks engage the frame To remove the control panel assembly the cabinet case must first be removed Then unplug all electrical leads from the back of the control panel assembly Slide the control panel assembly up and pull it away from the frame of the oven cavity See Figure 4 8 Switch Lever The switch lever is a molded plastic component with two pegs that fit into holes ...

Страница 33: ... the rear of the unit See Figure 4 11 Oven Lamp and Lamp Socket The oven lamp is screwed into the lamp socket The lamp socket is inserted down into the light socket mounting hole in the top of the magnetron duct and secured using a screw Oven Lamp To remove the lamp the cabinet case must first be removed Then remove the screw secur ing the lamp socket to the magnetron duct and pull straight up See...

Страница 34: ...rt is inserted into a slot in the back cover of the oven cavity A screw at the front of the support holds the support to a flange on the oven cavity frame There is also a screw inserted through the bottom flange of the support into the top of the magnetron There is also a ground wire attached to the support toward the front To remove the chassis support the cabinet case and magnetron fuse must fir...

Страница 35: ...r shaft it may be necessary to hold the edge of the fan motor rotor with pliers while pulling and rotat ing the fan blade Cooling Fan Motor To remove the fan motor first follow the steps listed above to remove the fan duct After the duct is removed disconnect the wire leads from the fan motor Extract the motor mounting screws from the back of the unit and lift the motor out See Figure 4 17 Magnetr...

Страница 36: ...d Rectifier To remove the rectifier follow the steps list ed above to dismount the capacitor band first Then extract the screw which holds the rectifier to the capaci tor band and cut off the wire connector at the capacitor end of the wire between the capacitor and the mag netron See Figure 4 22 Transformer Two corners of the transformer base fit into channels on the microwave oven base plate Scre...

Страница 37: ...ty into the top of the duct The AH sensor is attached to the AH sensor duct with a screw AH Sensor To remove the AH sensor the cabinet case must first be removed Then disconnect the AH sensor wire lead from the back of the control panel assembly Extract the sensor mounting screw and pull the sensor from the sensor duct See Figure 4 26 AH Sensor Duct To remove the AH sensor duct first follow the st...

Страница 38: ...ure 4 28 NOTE After removing the cover make sure all edges of cover that have become bent at the snip points are flattened before reinstalling Turntable Motor Cushion and Motor Packing To remove the turntable motor cushion and motor packing first follow the steps listed above to remove the motor cover After the cover is removed disconnect the elec trical leads from the motor Extract the motor moun...

Страница 39: ...TED BEFORE SERVICING THE MICROWAVE OVEN THE CAPACITOR MUST BE DISCHARGED BY SHORTING THE CONNECTING LEAD OF THE RECTIFIER AGAINST THE CHASSIS WITH AN INSULATED SCREW DRIVER FAILURE TO FOLLOW THIS STEP COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH NOTE THE CAPACITOR REMAINS CHARGED APPROXIMATELY 60 SECONDS AFTER THE OVEN IS SWITCHED OFF WAIT FOR 60 SECONDS THEN SHORT THE CAPACITOR TO THE CHASSIS...

Страница 40: ... receptacle Monitor fuse blows when power cord is plugged into wall receptacle Any letters or indicators do not appear in display when power cord is first plugged into wall outlet Display does not operate properly when STOP CLEAR key is touched Buzzer should sound and or time of day should appear in display Oven lamp does not light when door is opened Oven lamp does not go out when door is closed ...

Страница 41: ...erate oven at POWER 10 HIGH selecting more than 60 seconds cook time Allow the water to heat for 60 seconds measuring with a stop watch second hand of a watch or the digital read out countdown 3 Remove the cup from the oven and again measure the temperature making sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded 4 Subtract the cold water temp...

Страница 42: ...s CAVITY TEMPERATURE FUSE TEST 1 Disconnect power supply cord and remove outer cabinet case 2 Open door and block it open 3 Discharge high voltage capacitor 4 A continuity check across the cavity temperature fuse terminals should indicate a closed circuit unless the temperature of the cavity temperature fuse reaches approximately 302 F 150 C An open cavity tempera ture fuse indicates overheating o...

Страница 43: ... Check the state of the relay contacts with an ohmmeter contacts should be open If contacts are closed replace entire circuit board 5 Reconnect all leads removed from components during testing 6 Reinstall the outer cabinet case then reconnect power supply cord 7 Run the oven and check all functions MONITOR SWITCH TEST 1 Disconnect power supply cord and remove outer cabinet case 2 Open door and blo...

Страница 44: ...by using insulation tape 5 Re connect the power supply cord KEY UNIT 1 Disconnect power supply cord and remove outer cabinet case 2 Open door and block it open 3 Discharge high voltage capacitor 4 Check Key Unit ribbon connection before replacement 5 Reconnect all leads removed from components during testing 6 Reinstall the outer cabinet case then reconnect power supply cord 7 Run the oven and che...

Страница 45: ...le is mak ing good contact verify that the door sensing switch stop switch operates properly that is the contacts are closed when the door is closed and open when the door is open If the door sensing switch stop switch is good disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed either close the door or short the door sensi...

Страница 46: ...ontrol unit is defective 7 Disconnect power supply cord and remove outer cabinet case 8 Open door and block it open 9 Discharge high voltage capacitor 10 Reconnect all leads removed from components during testing 11 Reinstall the outer cabinet case then reconnect power supply cord 12 Run the oven and check all functions COMPU DEFROST TEST WARNING THE OVEN SHOULD BE FULLY ASSEMBLED BEFORE PERFORMIN...

Страница 47: ...ove outer cabinet case b Open door and block it open c Discharge high voltage capacitor d Disconnect the leads to the primary of the power transformer and ensure that these leads remain isolat ed from other components and oven chassis by using insulation tape e After that procedure re connect the power supply cord f Follow steps on troubleshooting table below for repair g Disconnect power supply c...

Страница 48: ...net should be installed and screws tightened 1 The oven should be plugged in at least two minutes before sensor cooking 2 Fill approximately 200 milliliters 7 2 oz of tap water in 1000 milliliters measuring cup 3 Place the container on center of tray in the oven cavity 4 Close the door 5 Touch the Timer Clock pad once the Power Level pad twice the Start pad once and the Number pad once The oven is...

Страница 49: ...g operation c After approximately 25 seconds push plunger of select switch for more than 3 seconds This condition is same as judgement by AH sensor d After approximately 3 seconds the display shows xx xx which is remaining cooking time and the dis play count down 1 If the above is not the case the control unit is probably defective 2 If the above is proper the AH sensor is probably defective 10 Di...

Страница 50: ... i v a c n e v O o t T H W T H W D E R K L B T H W T H W T H W D E R T H W E S U F P M E T Y T I V A C R O T O M N A F T H W 1 T H W Y R G Y R G N R G G R O A N C H N E T O N f o r o t c u d n o c g n i d n u o r g e h T s a h d r o c y l p p u s r e w o p e h t r e w o p y b d e d n u o r g n e e b w e r c s g n i x i f d r o c y l p p u s e b s y a w l a t s u m w e r c s e h T t h g i t t p e k...

Страница 51: ...TERLOCK SWITCH TURN TABLE MOTOR T H W A1 110 120V AC 60Hz N GND GRN C T FUSE COM SENSOR CONTROL UNIT BLK H A2 CAVITY TEMP FUSE HUMIDITY N O N C COM G R O N R B G R O T H W T H W F3 F2 F1 B2 B1 COM N O BLU PRIMARY INTERLOCK RELAY N O T H W N O T H W Y R G BLU RED COM BRN U L B G R O OL TTM FM Wire Diagrams Schematics MW24 1100 MICROWAVE OVEN 7 3 814888 Revision A May 2009 Wire Schematic ...

Страница 52: ...4 7k R2 680 1 2w R3 510 1 2w R6 3 3k Q2 2SB1238 SP1 PKM22EPT Q1 2SB1238 RY1 RY2 Q3 KRC243M CN C 12PIN LEAD WIRE HARNESS LED GND VC VA INT VR BUZZER MICRO NC NC DOOR SENSING SWITCH OVEN LAMP TURNTABLE MOTOR FAN MOTOR AC AC MICRO DOOR SENSING SWITCH OVEN LAMP TURNTABLE MOTOR FAN MOTOR C10 C 2 C 3 C 1 C 4 C 9 C 5 C 6 C 7 C 8 C11 C12 A 2 NO COM COM B 2 B 2 NO MW24 1100 MICROWAVE OVEN Wire Diagrams Sch...

Страница 53: ... A E H E R D D A E T U N I M N E Z O R F S E L B A T G E V E C I R 1 6 2 7 3 8 4 9 5 0 Y R T L U O P D N U O R G T A E M N E Z O R F S E E R T N E R E M I T K C O L C P O T S R A E L C C61 330p 50v C62 330p 50v C63 330p 50v C64 330p 50v C65 330p 50v R75 270k R60 15k R61 15k R62 15k R63 15k R64 15k R65 15k R66 15k R67 15k R76 270k R77 270k R78 270k R79 270k k 5 1 0 7 R k 5 1 1 7 R k 5 1 2 7 R k 5 1...

Страница 54: ...D U R2 R1 R6 R5 SP1 3 E B 6 D 5 D 2 Q 4 R 2 6 1 1 P S 2 Y R 1 T C A 1 S R V 5 7 D F I M O U D 9 8 7 E 1 Q B 4 E RY1 C A OL TTM FM B Q3 CN C CN C CN B CN A 1 1 9 12 1 1 2 1 A X H V 2 2 MW24 1100 MICROWAVE OVEN Wire Diagrams Schematics 7 6 814888 Revision A May 2009 PC Board of Power Unit ...

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