Electrolux EI30MH55GBA Technical & Service Manual
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Electrolux EI30MH55GBA Technical & Service Manual

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Models
EI30MH55GBA
EI30MH55GSA
EI30MH55GWA
EI30MH55GZA
EI30MH55GBB
EI30MH55GSB
EI30MH55GWB
EI30MH55GZB
Publication #5995524377
September 2008
P/N 316439261

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Summary of Contents for Electrolux EI30MH55GBA

  • Page 1 Models EI30MH55GBA EI30MH55GSA EI30MH55GWA EI30MH55GZA EI30MH55GBB EI30MH55GSB EI30MH55GWB EI30MH55GZB Publication #5995524377 September 2008 P/N 316439261...
  • Page 3 Basic Information Section 1 Basic Information...

  • Page 4: Table Of Contents

    Basic Information This Manual has been prepared to provide Electrolux Service Personnel with Operation and Service Information for following Electrolux Microwave Ovens: EI30MH55GBA, EI30MH55GSA, EI30MH55GWA, EI30MH55GBB, EI30MH55GSB & EI30MH55GWB Table of Contents Section 1 Basic Information ........Stirrer Motors Replacement ........

  • Page 5: Section 1 Basic Information

    • All non-insulated electrical terminals, connectors, heaters, etc. are adequately spaced away from all metal parts and panels. • All safety grounds (both internal and external) are correctly and securely connected. • All panels are properly and securely reassembled. © 2008 Electrolux Home Products, Inc.
  • Page 6 THIS SERVICE MANUAL IS INTENDED FOR USE BY PERSONS HAVING ELECTRICAL AND MECHANICAL TRAINING AND A LEVEL OF KNOWLEDGE OF THESE SUBJECTS GENERALLY CONSIDERED ACCEPTABLE IN THE APPLIANCE REPAIR TRADE. ELECTROLUX HOME PRODUCTS CANNOT BE RESPONSIBLE, NOR ASSUME ANY LIABILITY, FOR INJURY OR DAMAGE OF ANY KIND ARISING FROM THE USE OF THIS MANUAL.

  • Page 7: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    Before servicing an operative unit, perform a microwave emission 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.

  • Page 8: Before Servicing

    Basic Information WARNING MICROWAVE OVENS CONTAIN CIRCUITRY CAPABLE OF PRODUCING VERY HIGH VOLTAGE AND CURRENT, CONTACT WITH FOLLOWING PARTS MAY RESULT IN A SEVERE, POSSIBLY FATAL, ELECTRICAL SHOCK. (EXAMPLE) INVERTER UNIT THAT INCLUDES HIGH VOLTAGE POWER TRANSFORMER, HIGH VOLTAGE RECTIFIER, HEAT SINK ETC., AND MAGNETRON, HIGH VOLTAGE HARNESS ETC..

  • Page 9: Servicing The Inverter Unit

    Basic Information Servicing the Inverter Unit WARNING THIS INVERTER UNIT CONTAINS CIRCUITRY CAPABLE OF PRODUCING HIGH VOLTAGE AND HIGH CURRENT. CONTACT WITH ANY PART OF THE HIGH VOLTAGE WILL RESULT IN ELECTROCUTION. DO NOT ACCESS ANY PARTS OF INVERTER UNIT WITH POWER SUPPLY CONNECTED. DO NOT OPERATE INVERTER UNIT ITSELF.

  • Page 10: Product Specification

    Basic Information Product Specification Item Description Power Requirements 120 Volts / 12 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1200 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 29-15/16" Height 17" Depth 15- 9/16" Cooking Cavity Dimensions Width 22-9/16"...

  • Page 11: Grounding Instructions

    Basic Information Grounding Instructions This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current.

  • Page 12: Oven Diagram

    Basic Information Oven Diagram 1. Oven door with see-through window. 2. Door hinges. 3. Oven lamp. It will light when oven is operating or door is open. 4. Door latches. The oven will not operate unless the door is securely closed. 5.

  • Page 13: Section 2 Operation

    Operation Section 2 Operation...

  • Page 14: Operating Sequence Description

    Operation Operating Sequence 6. When the door is opened during a cook cycle, the monitor switch, stop switch, secondary Description interlock switch and primary interlock switch are activated with the following results.The circuits to The following is a description of component functions the stirrer motor, the cooling fan motor, the during oven operation.
  • Page 15 Operation VARIABLE COOKING An example of how the sensor works: When Variable Cooking Power is programmed, the (BAKED POTATOES) 120 volts A.C. is supplied to the inverter unit which is operated by the control unit. Microwave power operation is as follows: The oven can be set for any of 11 power levels: 0% to 100%(HIGH).

  • Page 16: Hot Air Exhaust Ventilation Methods

    Operation 4. When the sensor detects the vapor emitted from the food, the display switches over to the remaining cooking time and the timer counts down to zero. At this time, the door may be opened to stir, turn, or season food. 5.

  • Page 17: Oven Schematic-Off Condition

    Operation SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED SECONDARY 2. CLOCK APPEARS ON DISPLAY INTERLOCK SWITCH N.O. N.O. PRIMARY INTERLOCK SWITCH FUSE OVEN LAMP MOTOR WITH TEMP. FUSE STIRRER MOTOR STOP SWITCH HOOD FAN 120VAC 60Hz. THERMAL CUT OUT High OVEN LAMP...

  • Page 18: Component Descriptions

    Operation Component Descriptions their being normally open contact switches. And the contacts of relay (RY1) are in the ON condition (contacts close). DOOR OPEN MECHANISM 2. As the door goes to a closed position, the The door is opened by pushing the open button on monitor switch contacts are first opened and the the control panel, refer to the Figure D-1.

  • Page 19: Touch Control Panel Operation

    Operation HOOD FAN MOTOR Control Unit The hood fan motor is a two-speed, single-phase, Control unit consists of LSI, power source circuit, syn- double pole induction type, requiring a hood fan chronizing signal circuit, reset circuit, buzzer circuit, capacitor. It is located outside the upper rear part of relay circuit indicator circuit, back light circuit and the oven cavity, is to remove, from around the oven, humidity sensor circuit.

  • Page 20: Description Of Lsi

    Operation Description of LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description VL2-VL1 Power source voltage input terminal. Standard voltage for LCD. AN7-AN5 Terminal to change cooking input according to the Model. By using the A/D converter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant.
  • Page 21 Operation Pin No. Signal Description Terminal not used. Connected to GND through the pull-downresistor. RESET Auto clear terminal. Signal is input to reset the LSI to the initial state when power is applied. Clock signal is output to a memory IC (IC3). Data signal is output to a memory IC (IC3).
  • Page 22 Operation Pin No. Signal Description SEG25 Terminal not used. 48-72 SEG24-SEG0 Segment data signal. Connected to LCD. The relation between signals are as follows: LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.) SEG 24 (48) ---------------SEG 24 (29) SEG 11 (61) ---------------- SEG 11 (16) SEG 23 (49) ---------------SEG 23 (28) SEG 10 (62) ---------------- SEG 10 (15)

  • Page 23: Humidity Sensor Circuit

    Operation Humidity Sensor Circuit (3) Detector Circuit of Humidity Sensor Circuit This detector circuit is used to detect the output voltage of the humidity circuit to allow the LSI to (1) Structure of Humidity Sensor control sensor cooking of the unit. When the unit The humidity sensor includes two thermistors as is set in the sensor cooking mode, 16 seconds shown in the illustration.
  • Page 24 Operation Notes 2-12...

  • Page 25: Troubleshooting Guide

    Troubleshooting Section 3 Troubleshooting Guide...

  • Page 26: Troubleshooting Guide Chart

    Troubleshooting Troubleshooting Guide When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the "Test Procedure "section. IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, relay (RY1) primary interlock switch and secondary interlock switch before replacing the monitor fuse.
  • Page 27 Troubleshooting CK = Check / RE = Replace NOISE FILTER LOW VOLTAGE CK NO POWER AT OUTLET RE SHORTED IN POWER CORD CK OPENED OR SHORTED WIRING CK HOOD MOTOR CAPACITOR RE HOOD LAMP OR SOCKET RE STIRRER MOTOR RE FAN MOTOR RE OVEN LAMP OR SOCKET HUMIDITY SENSOR (R2120J) FOIL PATTERN ON P.W.B.

  • Page 28: Test Procedures

    Troubleshooting Test Procedures Procedure Component Test Letter MAGNETRON ASSEMBLY TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.
  • Page 29 Troubleshooting Procedure Component Test Letter INVERTER UNIT TEST WARNING: DO NOT TOUCH THE COMPONENTS OF THE INVERTER UNIT WHILE INVERTER UNIT IS ENERGIZED. IT IS DANGEROUS BECAUSE THIS HAS HIGH VOLTAGE COMPONENTS. CAUTION: Do not operate inverter unit by itself . CAUTION: Do not connect the oven to wall outlet without the outer case installed.
  • Page 30 Troubleshooting Procedure Component Test Letter PRIMARY INTERLOCK SWITCH AND SECONDARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch.
  • Page 31 Troubleshooting Procedure Component Test Letter BLOWN MONITOR FUSE TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. If the monitor fuse is blown when the door is opened, check the primary interlock switch, secondary interlock switch and monitor switch according to the "TEST PROCEDURE"...
  • Page 32 Troubleshooting Procedure Component Test Letter HOOD FAN MOTOR TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. If the motor does not turn, touch the FAN HI/LO pad once (set hood fan motor power "HIGH") and check voltage between pins "1"...
  • Page 33 Troubleshooting Procedure Component Test Letter 1. Key Unit. NOTE: 1. Check key unit ribbon connection before replacement. 2. Re-install the hood intake duct R with seven (7) screws. 3. Re-install the outer case (cabinet). 4. Reconnect the power supply cord after the outer case is installed. 5.
  • Page 34 Troubleshooting Procedure Component Test Letter KEY UNIT TEST 1. Disconnect the power supply cord. 2. Open the door and block it open. 3. Remove the control panel assembly. 4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is making good contact, verify that the stop switch operates properly;...
  • Page 35 Troubleshooting Procedure Component Test Letter 8. Check voltage between the Pin No. 3 of the 3 pin connector (C) and the normal open terminal of the relay RY1 on the control unit with an A.C. voltmeter. The meter should indicate 120 volts, if not check oven circuit. RY1, RY3, RY4, RY5 and RY6 Relay Test: These relays are operated by D.C.
  • Page 36 Troubleshooting Procedure Component Test Letter FOIL PATTERN ON THE PRINTED WIRING BOARD TEST To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse. 1.
  • Page 37 Troubleshooting Procedure Component Test Letter Disconnect the power supply cord. 10) Open the door and block it open. 11) Reconnect all leads removed from components during testing. 12) Re-install the hood intake duct R. 13) Re-install the outer case (cabinet). 14) Reconnect the power supply cord after the outer case is installed.
  • Page 38 Troubleshooting Procedure Component Test Letter TESTING METHOD FOR HUMIDITY SENSOR AND/OR CONTROL UNIT To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor. (1) Disconnect the power supply cord, and then remove outer case.Refer to procedure of “HOOD LOUVER REMOVAL”, “REMOVAL OF OVEN FROM wall ”...
  • Page 39 Troubleshooting Procedure Component Test Letter (10) Disconnect the power supply cord, and then remove outer case. (11) Open the door and block it open. (12) Disconnect the dummy resistor circuit from the sensor connector of control panel. (13) Carry out necessary repair. (14) Reconnect all leads removed from components during testing and repairing.
  • Page 40 Troubleshooting Notes 3-16...

  • Page 41: Section 4 Component Teardown

    Component Teardown Section 4 Component Teardown...

  • Page 42: Servicing

    Component Teardown Servicing After checking the performance of the touch control panel, 1) Disconnect the power supply cord. 1. Precautions for Handling Electronic 2) Open the door and block it open. Components 3) Re-connect the leads to the primary of the This unit uses CMOS LSI in the integral part of inverter unit.

  • Page 43: Precautions For Using Lead-Free Solder

    Component Teardown 3. Servicing Tools 3. Soldering Tools required to service the touch control panel As the melting point of lead-free solder (Sn-Ag- assembly. Cu) is higher and has poorer wettability, (flow), to 1) Soldering iron: 30W prevent damage to the land of the PWB, extreme (It is recommended to use a soldering iron with a care should be taken not to leave the bit in con- grounding terminal.)

  • Page 44: Warnings

    Component Teardown WARNING HIGH VOLTAGE MICROWAVE OVENS CONTAIN CIRCUITRY CAPABLE OF PRODUCING VERY HIGH VOLTAGE AND CURRENT, CONTACT WITH FOLLOWING PARTS MAY RESULT IN SEVERE, POSSIBLY FATAL, ELECTRIC SHOCK. (EXAMPLE) MAGNETRON, INVERTER UNIT, HIGH VOLTAGE HARNESS ETC.. WARNING AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY. PLEASE FOLLOW THE INSTRUCTIONS BELOW BEFORE OPERATING THE OVEN.
  • Page 45 Component Teardown WARNING TO PREVENT AN ELECTRIC SHOCK, TAKE THE FOLLOWING PRECAUTIONS. 1. BEFORE WIRING, 1) DISCONNECT THE POWER SUPPLY CORD. 2) OPEN THE DOOR BLOCK IT OPEN. 2. DON’T LET THE WIRE LEADS TOUCH TO THE FOLLOWING PARTS; 1) HIGH VOLTAGE PARTS: MAGNETRON AND INVERTER UNIT.

  • Page 46: Hood Louver Removal

    Component Teardown Hood Louver Removal Outer Case Removal 1. Disconnect the power supply cord. Remove the oven from the wall, referring to "Removal 2. Open the door and block it open. of oven from wall " and proceed as follows: 3.

  • Page 47: Magnetron Removal

    Component Teardown Magnetron Removal Hood Fan Thermal Cut-out Removal 1. Disconnect the power supply cord and remove 1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall"...

  • Page 48: Inverter Unit And Fan Motor Replacement

    Component Teardown Inverter Unit and Fan Motor Reinstallation Replacement 1. Install the fan motor to the fan duct with the two (2) screws. Removal 2. Install the fan blade to the fan motor shaft. Refer 1. Disconnect the power supply cord and remove to “METHOD FOR INSTALLING FAN BLADE”.

  • Page 49: Method For Removing Fan Blade

    Component Teardown Method for Removing Fan Blade Method for Installing Fan Blade 1. Hold the edge of the rotor of the fan motor by 1. Hold the center of the bracket which supports the using a pair of groove joint pliers. shaft of the fan motor on the flat table.

  • Page 50: Stirrer Motors Replacement

    Component Teardown Stirrer Motors Replacement Stirrer Fan Assembly Installation Removal 1. Make sure that the stirrer fan faces upside, as 1. Disconnect the power supply cord. shown in the following figure. The upside of the 2. Open the door and block it open. stirrer fan is engraved with the part number.

  • Page 51: Oven Lamp And Lamp Socket Removal

    Component Teardown Oven Lamp and Lamp Socket Control Panel Assembly, Control Removal Unit and Key Unit Removal 1. Disconnect the power supply cord. 1. Disconnect the power supply cord. 2. Open the door and block it open. 2. Open the door and block it open. 3.

  • Page 52: Humidity Sensor Removal

    Component Teardown Humidity Sensor Removal Noise Filter Removal 1. Disconnect the power supply cord and remove 1. Disconnect the power supply cord and remove the oven from wall and remove outer case. the oven from wall and remove outer case. (Refer 2.

  • Page 53: Stop Switch, Primary Interlock Switch, Secondary Interlock Switch And Monitor Switch

    Component Teardown Reinstallation Stop Switch, Primary Interlock 1. Remove the two (2) stirrer fans. Switch, Secondary Interlock Switch 2. Clean the oven cavity bottom plate and /or under and Monitor Switch the antenna plate assembly by a vacuum cleaner. 3. Reinstall the two (2) stirrer fans to the stirrer 1.

  • Page 54: Stop Switch, Primary Interlock Switch, Secondary Interlock Switch And Monitor Switch Adjustment

    Component Teardown Stop Switch, Primary Interlock After adjustment, check the following: Switch, Secondary Interlock Switch 1. In and out play of door remains less than 0.5mm and Monitor Switch Adjustment when in the latched position. First check upper position of latch hook, pushing and pulling upper 1.

  • Page 55: Door Replacement

    Component Teardown Door Replacement After any servicing, make sure of the following : 1. Door latch heads smoothly catch latch hook 1. Disconnect the power supply cord. through latch holes and that latch head goes 2. Open the door and block it open. through center of latch hole.
  • Page 56 Component Teardown Notes 4-16...

  • Page 57: Wiring Diagrams

    Wiring Diagrams Section 5 Wiring Diagrams...

  • Page 58: Pictorial Diagram

    Wiring Diagrams Figure S-1. Pictorial Diagram...

  • Page 59: Power Unit Circuit

    Wiring Diagrams Figure S-2b. Power Unit Circuit...

  • Page 60: Lsi Unit Circuit

    Wiring Diagrams Figure S-3b. LSI Unit Circuit...

  • Page 61: Printed Wiring Board

    Wiring Diagrams Figure S-4. Printed Wiring Board...
  • Page 62 Wiring Diagrams Notes...

  • Page 63: Section 6 Parts List

    Parts List Section 6 Parts List...
  • Page 64 Parts List Note: The parts marked “ ∆" may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. Q'TY REF. NO. DESCRIPTION ELECTRIC PARTS Inverter unit DPWBFC398WRUZ Magnetron RV-MZA328WRZZ ∆ Power supply cord FACCDB011MRE0 Stirrer motor RMOTDA276WRZZ Thermal cut-out (Oven) Open at 145...
  • Page 65 Parts List LANG-B006MRP0 ************* Part no longer used DPLT-B001MRK0 Distribution plate assembly PDUC-B133MRF0 Hood duct R PDUC-B134MRF0 PDUC-B137MRP0 Fan duct PDUC-B117MRF0A Ori ce NSFTPB011MRF0 Left stirrer shaft Stirrer motor gear NGERHB001MRF0 LANGTB065MRP0 Motor mounting angle FSFTTB001MRE0 Stirrer shaft assembly LHLD-B024MRF0 Rack holder front LHLD-B025MRF0 Left rear rack holder...

  • Page 66: Parts List

    Parts List Oven Parts OVEN PARTS...
  • Page 67 Parts List Cabinet Parts CABINET PARTS...
  • Page 68 Parts List Door Parts DOOR PARTS CONTROL PANEL PARTS MISCELLANEOUS Attached to Red & Blue wires @ Inverter unit Attached to HV wire @ Mag Terminals...

  • Page 69: Packing And Accessories

    Parts List Packing and Accessories PACKING AND ACCESSORIES GREASE FILTER (x 2) Rack TOP PAD TOP AND WALL TEMPLATE OPERATION MANUAL INSTALL MATERIAL ASSEMBLY DOOR PROTECTOR INSTALATION INSTRUCTIONS WRAP COVER EXHAUST DAMPER ASSEMBLY ACCESSORY PACK DOOR PAD BOTTOM PAD Non-replaceable items PACKING CASE...
  • Page 70 Parts List Notes...

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