Electrolux EI30BM55HB - 30" Microwave Oven Technical & Service Manual Download

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Section 5

Wiring Diagrams

Summary of Contents for EI30BM55HB - 30" Microwave Oven

Page 1: ... 5995524393 October 2008 Technical Service Manual Over The Range Microwave Oven ...

Page 2: ......

Page 3: ...1 1 Section 1 Basic Information Basic Information ...

Page 4: ...leshooting Guide 3 2 Troubleshooting Guide Chart 3 3 Test Procedures 3 4 Section 4 Component Teardown 4 1 Servicing 4 2 Precautions for Using Lead Free Solder 4 3 Warnings 4 4 Removal of Oven From Wall 4 6 Hood Louver Removal 4 6 Outer Case Removal 4 6 Hood Fan Motor Removal 4 6 Magnetron Removal 4 7 High Voltage Rectifier High Voltage Capacitor 4 7 Hood Fan Motor Hood Duct Oven Lamp Socket and Hu...

Page 5: ...ation of any safety device 5 Use ONLY REPLACEMENT PARTS CATALOGED FOR THIS APPLIANCE Substitutions may defeat com pliance with Safety Standards Set For Home Appliances 6 GROUNDING The standard color coding for safety ground wires is GREEN or GREEN with YELLOW STRIPES Ground leads are not to be used as current carrying conductors It is EXTREMELY important that the service technician reestablish all...

Page 6: ... OTHER VISIBLE DAMAGE WITH THE OVEN SERVICING AND REPAIR WORK MUST BE CARRIED OUT ONLY BY TRAINED SERVICE PERSONNEL WARNING CERTAIN INITIAL PARTS ARE INTENTIONALLY NOT GROUNDED AND PRESENT A RISK OF ELECTRI CAL SHOCK ONLY DURING SERVICING SERVICE PERSONNEL DO NOT CONTACT THE FOLLOWING PARTS WHILE THE APPLIANCE IS ENERGIZED INVERTER UNIT THAT INCLUDES HIGH VOLTAGE CAPACITOR HIGH VOLTAGE POWER TRANS...

Page 7: ...mission check as per the Microwave Measurement Procedure outlined in this service manual If microwave emissions level is in excess of the specified limit contact Electrolux HOME PRODUCTS INC immediately If the unit operates with the door open service person should 1 tell the user not to operate the oven and 2 contact Electrolux HOME PRODUCTS INC and Food and Drug Administration s Center for Device...

Page 8: ...s removed from components during testing 2 Reinstall the outer case cabinet 3 Reconnect the power supply cord after the outer case is installed 4 Run the oven and check all functions Microwave ovens should not be run empty To test for the presence of microwave energy within a cavity place a cupof cold water on the oven turntable close the door and set the power to HIGH and set the microwave timer ...

Page 9: ...ater container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx 8 5 cm 3 1 2 in and made of an electrically nonconductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately 4 Set the cooking control on Full Power Cooking Mode 5 Close the door...

Page 10: ...ate P HIFull power throughout the cooking time P 90approx 90 of Full Power P 80approx 80 of Full Power P 70approx 70 of Full Power P 60approx 60 of Full Power P 50approx 50 of Full Power P 40approx 40 of Full Power P 30approx 30 of Full Power P 20approx 20 of Full Power P 10approx 10 of Full Power P 0No power throughout the cooking time Quick Breakfast Express Lunch Dinner Recipes Popcorn Reheat S...

Page 11: ...the electric current Electrical Requirements The oven is equipped with a 3 prong grounding plug DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG The power supply cord and plug must be connected to a separate 1 20 Volt AC 60 Hz 1 5 Amp or more dedicated line using a grounded receptacle The receptacle should be located inside the cabinet directly above the Microwave Oven ...

Page 12: ...for medium three times for low and four times to turn off the light 10 Fan pad Touch the fan pad once for high speed twice for medium speed three times for low speed and for four times to turn off the fun 11 Auto Touch control panel 12 Time display Digital display 99 minutes 99 seconds 13 Ventilation openings 14 Removable turntable The turntable will rotate clockwise or counter clockwise Only remo...

Page 13: ...2 1 Section 2 Operation Operation ...

Page 14: ... where the food is placed to be cooked 5 Upon completion of the cooking time the power transformer oven lamp etc are turned off and the generation of microwave energy is stopped The oven will revert to the OFF condition 6 When the door is opened during a cook cycle monitor switch door sensing switch secondary interlock switch and primary interlock relay are activated with the following results The...

Page 15: ...er operation is as follows Vari Mode ON TIME OFF TIME Power 10 High 100 Power 32 sec 0 sec Power9 P 90 Approx 90 30 sec 2 sec Power8 P 80 Approx 80 26 sec 6 sec Power7 P 70 Approx 70 24 sec 8 sec Power6 P 60 Approx 60 22 sec 10 sec Power5 P 50 Approx 50 18 sec 14 sec Power4 P 40 Approx 40 16 sec 16 sec Power3 P 30 Approx 30 12 sec 20 sec Power2 P 20 Approx 20 8 sec 24 sec Power1 P 10 Approx 10 r 6...

Page 16: ...ers at the right and left sides of the base cover up through the right and left sides of the oven cavity then discharged vertically at rear center top of the oven into the customer s vent system 2 HORIZONTAL VENTING The air handing is the same as VERTICAL VENTING except that the final air discharge is directed horizontally out from the top rear of the oven into the customer s vent system 3 RE CIRC...

Page 17: ...the power transformer primary winding 3 Only certain models use the humidity sensor 1 Circuits subject to change without notice 2 The neutral wire White or Gray wire must be connected to the prescribed tab terminal of the lamp socket NOTES BLK RED BLK BRN MAGNETRON TEMP FUSE WHT 2 1 3 6 3 2 4 5 1 RY5 C1 HOOD FAN MOTOR WHT RY6 RY7 RY9 BLK WHT BRN BRN BRN WHT WHT OVEN LAMP RELAY GRY GRY GRY GRY CONT...

Page 18: ...e door sensing switch and the secondary interlock switch contacts close On opening the door each of these switches operate inversely 3 If the door is opened and the primary interlock relay RY2 and secondary interlock switch contacts fail to open the monitor fuse blows simultaneously with closing of the monitor switch contacts CAUTION Before replacing a blown monitor fuse test the door sensing prim...

Page 19: ...e stirrer fans to stir the microwave radiation from the waveguide COOK TOP LAMP The cook top lamp is mounted at the lamp mounting angle on the base cover Touch the Light pad once for high twice for medium three times for low and four times to turn off the light Touch Control Panel Operation The touch control section consists of the following units as shown in the touch control panel circuit 1 Key ...

Page 20: ...fied by the operational amplifier Ventilation Opening Sensing part Open vessel Sensing part Closed vessel Thermistors for Sensing C S R3 R1 R2 Operational amplifier Output voltage S Thermistor open vessel C Thermistor closed vessel 2 Absolute humidity g m O e g a t l o v t u p t u Absolute humidity vs output voltage characteristic Operation 2 8 6 Power Source Circuit This circuit generates voltage...

Page 21: ... generate moisture by which the resistance balance of the bridge circuit is deviated to increase the voltage available at AN1 terminal of the LSI Then the LSI observes that voltage at AN1 terminal and compares it with its initial value and when the comparison rate reaches the preset value fixed for each menu to be cooked the LSI causes the unit to stop sensor cooking thereafter the unit goes in th...

Page 22: ...Operation 2 10 Notes ...

Page 23: ...3 1 Section 3 Troubleshooting Guide Troubleshooting ...

Page 24: ...with the power supply cord disconnected It may in some cases be necessary to connect the power supply cord after the outer case has been removed in this event 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 To discharge high voltage capacitor wait for 60 seconds 4 Disconnect the leads to the primary of the inverter unit 5 Ensure that the leads rema...

Page 25: ...ook s e o d t i t u B e l c y c s i r o o d n e h w t h g i l o d e n e p F e o d r o t o m n a n e v O e t a r e p o t o n s m a l p r o t o m e l b a t n r u t d n a e t a r e p o Tur r o t o m e l b a t n e o d O e t a r e p o t o n s s t h g i l p m a l n e v f d n a a m n o r o t e t a r e p o o d n e v O o n s e o g t in o c o t y c k o w e l c hen ST d a p T R A s i u o t ched n e v O seem ...

Page 26: ...urate mercury thermometer or thermocouple type tempera ture tester For accurate results the following procedure must be followed carefully 1 Fill the measuring cup with 1 6 oz 453cc of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester Stir the thermometer or thermocouple through the water until the temperature stabilizes Record the temperature...

Page 27: ... should be less than 1 ohm 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions HIGH VOLTAGE RECTIFIER TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Isolate t...

Page 28: ... closed circuit unless the temperature of the thermal cut out reaches approximately 293 F 145 C An open thermal cut out indicates overheating of the oven exchange the oven thermal cut out and check inside of oven cavity and for improper setting of cooking time or operation of control unit Check for restricted air flow through the vent holes of the oven cavity especially the cooling fan and air gui...

Page 29: ...l of the switch The meter should indicate an open circuit with the door open and a closed circuit with the door closed If improper operation is indicated replace the door sensing switch 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions NOTE If the...

Page 30: ...einstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions BLOWN MONITOR FUSE TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 If the monitor fuse is blown when the door is opened check the secondary interlock switch primary interl...

Page 31: ...tacts will open The thermal cut out closes automatically at approximately 131 F 55 C 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions HOOD FAN MOTOR TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it o...

Page 32: ... the covers 4 Reconnect the power supply cord after the covers are installed 5 Run the oven and check all functions The following symptoms indicate a defective keyboard unit a When touching the pads a certain pad produces no signal at all b When touching a number pad two figures or more are displayed c When touching the pads sometimes a pad produces no signal If the keyboard unit is defective 1 Di...

Page 33: ...n and check all functions KEYBOARD GLASS UNIT TEST 1 Disconnect the power supply cord and then reconnect power supply cord Display should show the word ENJOY YOUR OVEN PRESS CLEAR AND PRESS CLOCK in either one or both displays 2 Immediately press the following keys within 20 seconds Power Level then Set Clock then Start add 30 sec then Stop Clear Test mode should start checking each digit 3 After ...

Page 34: ...meter during the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective 8 f any abnormal condition is defected replace the control unit 9 Disconnect the power supply cord and then remove outer case 10 Open the door and block it open 11 Discharge high voltage capacitor 12 R...

Page 35: ...ter above check and repairs are finished 1 Disconnect the power supply cord 2 Remove the covers 3 Open the door and block it open 4 Discharge high voltage capacitor 5 Disconnect the leads to the primary of the power transformer 6 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape 7 After that procedure re connect the power supply cord 8 Follow t...

Page 36: ...ll shut off Water load cooking test WARNING The oven should be fully assembled before following procedure Make sure the oven has been plugged in at least two minutes before checking sensor cook operation The cabinet should be installed and screws tightened 1 Fill approximately 200 milliliters of tap water in a 1000 milliliter measuring cup 2 Place the container on the center of tray in the oven ca...

Page 37: ...e re connect the power supply cord 9 Check the sensor cook operation proceed as follows a Close the door Touch the SET CLOCK pad once the POWER LEVEL pad twice and the START pad once And touch the number pads 1 once and the number pad 2 once b The control panel is in the sensor cooking operation c After approximately 41 seconds push plunger of select switch for more than 3 seconds This condition i...

Page 38: ...ings are obtained replace the noise filter 6 Reconnect all leads removed from components during testing 7 Reinstall the outer case cabinet 8 Reconnect the power supply cord after the outer case is installed 9 Run the oven and check all functions MEASURING POINT INDICATION OF OHMMETER Between N and H Approx 470 KΩ Between terminal N and LOAD Short circuit Between terminal L and LOAD Short circuit M...

Page 39: ...4 1 Section 4 Component Teardown Component Teardown ...

Page 40: ...ter checking the performance of the touch control panel 1 Disconnect the power supply cord 2 Open the door and block it open 3 Re connect the leads to the primary of the inverter unit 4 Re install the outer case cabinet 5 Re connect the power supply cord after the outer case is installed 6 Run the oven and check all functions A On some models the power supply cord between the touch control panel a...

Page 41: ...alloy type of the solder Example 2 Using lead free wire solder When repairing a PWB with the LF symbol only lead free solder should be used Using normal tin lead alloy solder may result in cold sol dered joints and damage to printed patterns As the melting point of lead free solder is approxi mately 40 C higher than tin lead alloy solder it is recommend that a dedicated bit is used and that the ir...

Page 42: ...S THE LATCH LEADS TO RISE IT IS THEN POSSIBLE TO HEAR A CLICK AS THE DOOR SWITCHES OPERATE 3 VISUALLY CHECK THE DOOR AND CAVITY FACE PLATE FOR DAMAGE DENTS CRACKS SIGNS OF ARCING ETC CARRY OUT ANY REMEDIAL WORK THAT IS NECESSARY BEFORE OPERATING THE OVEN DO NOT OPERATE THE OVEN IF ANY OF THE FOLLOWING CONDITIONS EXIST 1 DOOR DOES NOT CLOSE FIRMLY 2 DOOR HINGE SUPPORT OR LATCH HOOK IS DAMAGED 3 THE...

Page 43: ...TO PREVENT A FAULT FAN BLADE FAN MOTOR SWITCH SWITCH LEVER OPEN BUTTON 3 DO NOT CATCH THE WIRE LEADS IN THE OUTER CASE CABINET 4 INSERT THE POSITIVE LOCK CONNECTOR UNTIL ITS PIN IS LOCKED AND MAKE SURE THAT THE WIRE LEADS DO NOT COME OFF EVEN IF THE WIRE LEADS ARE PULLED 5 TO PREVENT AN ERROR FUNCTION CONNECT THE WIRE LEADS CORRECTLY REFERRING TO THE PICTORIAL DIAGRAM Please refer to OVEN PARTS CA...

Page 44: ...od louver to the oven cavity 5 Remove the hood louver from the over by pushing the right and left tabs of the hood louver 6 Now the hood louver is free Component Teardown 4 6 Hood louver Screw Outer case cabinet Screw Screw Outer Case Removal Remove the oven from the wall and proceed as follows 1 Disconnect the power supply cord 2 Open the door and block it open 3 Remove the one 1 screw holding th...

Page 45: ...e screws hold the magnetron to prevent it from falling 13 Remove the magnetron from the unit with care so the magnetron tube should not be hit by any metal object around the tube High Voltage Rectifier and High Voltage Capacitor Removal 1 Disconnect the power supply cord and remove the oven from wall and remove outer case Refer to procedure of Removal of Oven from Wall and Outer Case Removal 2 Ope...

Page 46: ...hassis support left 11 Now the hood fan motor is free 12 Remove the one 1 screw holding the noise filter assembly to the fan duct 13 Disconnect the connector CN F and CN D from the control unit 14 Remove one 1 screw holding the hood duct to the oven cavity top plate 15 Remove the one 1 screw holding the hood duct to the fan duct 16 Release the 6 pin connector and the 3 pin connector of the main ha...

Page 47: ...ron and high voltage capacitor Refer to PICTORIAL DIAGRAM 4 Re install the capacitor 5 Re install the base cover and the deflector 6 Re install the outer case and check that oven is operating properly Hood Fan Thermostat 60ºC ON and 70ºC Off Removal 1 Disconnect the power supply cord remove the oven from wall and remove outer case Refer to procedure of Removal of Oven from Wall and Outer Case Remo...

Page 48: ... of the fan motor because the coil may be cut or damaged Do not disfigure the bracket by touching with the pliers CAUTION Do not reuse the removed fan blade because the hole for shaft may be larger than normal 2 INSTALLATION 1 Install the fan motor to the fan duct with the two 2 screws 2 Install the fan blade to the fan motor shaft accord ing to the following procedure 3 Hold the center of the bra...

Page 49: ... the lamp mounting angle from the oven cavity face plate 7 Disconnect the wire leads from the lamp socket 8 Remove the two 2 screws holding the lamp socket from the lamp mounting angle 9 Now the lamp socket is free Stirrer Antenna Motor Removal 1 Disconnect the power supply cord and remove the oven from wall and remove outer case Refer to procedure of Removal of Oven from Wall and Outer Case Remov...

Page 50: ...ght panel 11 Now the power unit is free Door Sensing Switch Secondary Interlock Switch and Monitor Switch Removal 1 REMOVAL 1 Disconnect the power supply cord and remove the oven from wall and remove outer case Refer to procedure of Removal of Oven from Wall and Outer case Removal 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Remove the control panel assembly referring to ...

Page 51: ... of the latch hook should be adjusted so that the monitor switch is activated with the door closed 7 Secure the screws with washers firmly 8 Check all of the switches operation If any switch has not activated with the door closed loosen screw and adjust the latch hook position 2 After adjustment check the following 1 In and out play of door remains less than 0 5mm when in the latched position Firs...

Page 52: ...oor assembly 7 Re install the hood louver to the oven cavity front face plate NOTE After any service to the door A Make sure that stop switch primary interlock switch secondary interlock switch and monitor switch are operating properly Refer to chapter Test Procedures B An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standa...

Page 53: ... of about 0 5mm into the gap A between the choke cover and door stopper and between the choke cover and the door frame as shown Figure C 3 to free engaging parts 8 Pry the choke cover by inserting a putty knife in order shown in Figure C 3 9 Now choke cover is free from door panel and door frame LATCH SPRING LATCH HEAD AND DOOR PANEL 10 Release the latch spring from the tab of the latch head and t...

Page 54: ...Component Teardown 4 16 Notes ...

Page 55: ...5 1 Section 5 Wiring Diagrams Wiring Diagrams ...

Page 56: ...CONDARY INTERLOCK SWITCH OVEN LAMP TURNTABLE MOTOR TTM FM ATM OL CL HM COM HIGH VOLTAGE RECTIFIER HIGH VOLTAGE CAPACITOR POWER TRANSFORMER 4 The neutral wire White Gray wire must be connected to the winding start tab terminal of the power transformer primary winding 3 Only certain models use the humidity sensor 1 Circuits subject to change without notice 2 The neutral wire White or Gray wire must ...

Page 57: ...DD TEST XOUT XIN VSS P74 P73 P72 P71 P70 P67 P66 P65 P64 P63 P62 P61 P60 AVDD VAREF P07 C62 C63 0 1u 50V 4MHz 10K 10K 4 7K x5 Q29 Q28 Q27 Q26 Q25 Q24 Q23 Q22 Q20 C20 Q21 R51 R31 R32 Q31 KTA1046Y 2SA1037 2SA1037 10K 10K Q32 2SA1037 IC 2 R54 R7 Q10 R3 R2 R4 8 2 47u 16V 1W Q1 C6 D5 D1 D4 D3 D2 1 D1 4 1N4002 x4 _ _ _ IN COM OUT Q5 680 1 2W 680 1 2W KIA79L05BP D1 D3 D2 D9 D11 D10 VP F2 F1 GND 0V GND 0V...

Page 58: ...1 42 43 44 Y4A Y4B Y5A Y5B VDD VSS LED DRDY VREF SYNC SS R223 P03 P07 1 3 4 5 2 6 G 6 J11 J9 J10 VP F1 F2 F2 F2 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 21 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P16 1G 2G 3G 4G 5G 6G 7G 8G 23 24 25 26 27 28 29 30 33 34 F1 F1 G 1 G 3 G 4 G 5 G 2 CN J IC 4 CN G CN K S11B PASK 2 BM06B XASS QT60326 WH A VFD B6B XH A VC TEST TXD RXD RST VS 1 2 3 4 5 6 0V...

Page 59: ... 6 5 RY5 7 1 CN B 1 11 JP15 SP JP16 CN D JP23 JP30 JP29 JP31 JP26 CN E RY2 C21 Q21 C100 JP22 JP21 DIP JP32 C10 JP2 CN F 1 3 JP1 JP6 R3 Q5 JP18 JP19 JP17 JP20 JP24 JP25 JP27 JP28 C E C B E C B E C B 1 2 R2 R1 Q1 I O CF1 6 1 1 5 RY4 RY1 RY3 RY9 RY8 RY7 RY6 R100 1 9 CN C D29 CN A VRS1 FUSE 2 5A Figure 5 4 Printed Wiring Board ...

Page 60: ...Wiring Diagrams 5 6 Notes ...

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