Electrolux E30SO75ESS Service Manual
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Electrolux E30SO75ESS Service Manual

High speed convection microwave oven
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See also: Technical & Service Manual , Use and Care Manual
In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should
be used.
WARNING TO SERVICE PERSONNEL: 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. (High Voltage Capacitor,
High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)
BEFORE SERVICING .................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL .............................................................................................................. 1
MICROWAVE MEASUREMENT PROCEDURE .................................................................................................. 2
FOREWORD AND WARNING ............................................................................................................................. 3
PRODUCT SPECIFICATIONS ............................................................................................................................ 4
GENERAL INFORMATION ................................................................................................................................. 4
OPERATION ........................................................................................................................................................ 6
TROUBLESHOOTING GUIDE .......................................................................................................................... 13
TEST PROCEDURE .......................................................................................................................................... 15
TOUCH CONTROL PANEL ............................................................................................................................... 26
PRECAUTIONS FOR USING LEAD-FREE SOLDER ....................................................................................... 30
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .............................................................. 31
PICTORIAL DIAGRAM ...................................................................................................................................... 39
POWER UNIT CIRCUIT .................................................................................................................................... 40
CPU UNIT CIRCUIT .......................................................................................................................................... 41
PARTS LIST ...................................................................................................................................................... 42
PACKING AND ACCESSORIES ....................................................................................................................... 47
This document has been published to be used for after sales service only. The contents are subject to
change without notice.
Publication # 5995505426
ELECTROLUX
SERVICE MANUAL

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P. O. Box 212378, Augusta, GA, 30917
800•944•9044
HIGH SPEED CONVECTION
MICROWAVE OVEN
E30SO75ESS
MODEL
1
E30SO75ESS
S75M255E30SO7
Page
P/N 316439260

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  • Page 1: Table Of Contents

    PACKING AND ACCESSORIES ........................47 This document has been published to be used for after sales service only. The contents are subject to change without notice. ELECTROLUX HOME PRODUCTS, INC. P. O. Box 212378, Augusta, GA, 30917 800•944•9044 Publication # 5995505426...

  • Page 2: Precautions To Be Observed Before And During Service 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 3: Warning To Service Personnel

    E30SO75ESS WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High Voltage Harness etc..

  • Page 4: Microwave Measurement Procedure

    E30SO75ESS MICROWAVE MEASUREMENT PROCEDURE A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm at any point 5cm or more from the external surface of the oven, measured prior to acquisition...

  • Page 5: Foreword And Warning

    PRODUCT DESCRIPTION MICROWAVE OVEN E30SO75ESS GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Electrolux Home Products OPERATION Service Personnel with Operation and Service Information for the ELECTROLUX HIGH SPEED MICROWAVE OVEN, E30SO75ESS. TROUBLESHOOTING GUIDE It is recommended that service personnel carefully study the entire...

  • Page 6: Product Specifications

    E30SO75ESS SPECIFICATION ITEM DESCRIPTION Power Requirements 240 Volts 7.9 Amperes (Microwave) / 14.2 Amperes (Convection)/ 12.8 Amperes (Speed Cooking) 60 Hertz / Single phase, 3 wire grounded Power Output 1000 watts (IEC Test Procedure) Operating frequency of 2450MHz Top Heater Power Output...
  • Page 7 E30SO75ESS Electrical Requirements Receptacle Box Cover 3 Pronged Plug The electrical requirements are a 240 volt 60 Hz, AC only, 15 amp. protected electrical (6-15P) supply. It is recommended that a separate circuit serving only this appliance be provided. 3 Pronged Receptacle The 240 volt circuit is absolutely necessary for optimum cooking performance.

  • Page 8: Operation

    E30SO75ESS OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during are activated with the following results. The circuits to the oven operation. turntable motor, the cooling fan motor, and the high voltage components are de-energized, the oven lamp...
  • Page 9 E30SO75ESS motor and convection motor are turned on. start pad is touched, following operations occur; 2. The coil of relay (RY4) is energized by the control unit. (Figure O-3) The damper is moved to the closed position, closing the 1. The contacts of the relays RY1, RY3 and RY5 are damper switch contacts.

  • Page 10: Schematic Diagram

    E30SO75ESS time. And the oven will cook according to the special cooking measurement circuit is sampled by the LSI and twenty sequence. five (25) seconds after the thermistor is cut off the LSI turns on the convection fan for three (3) seconds.
  • Page 11 E30SO75ESS SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. NOTE: " " indicates components with potential above 250V. 2. COOKING TIME PROGRAMMED. 3. “START” PAD TOUCHED. LV TRANSFORMER TEMP. FUSE SIDE HEATER THERMAL CUT-OUT TOP HEATER FUSE THERMAL F10A CUT-OUT SOLID-STATE RELAY FUSE12.5A...
  • Page 12 E30SO75ESS SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. GRILL PAD TOUCHED. 3. COOKING TIME PROGRAMMED. NOTE: " " indicates components with potential above 250V. 4. “START” PAD TOUCHED. LV TRANSFORMER TEMP. FUSE SIDE HEATER THERMAL CUT-OUT TOP HEATER...

  • Page 13: Description And Function Of Components

    E30SO75ESS DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM secondary interlock switch contacts fail to open, the The door is opened by pulling the door handle down and monitor fuse blows simultaneously with closing of the forward, referring to the figure D-1. When the door handle is monitor switch contacts.
  • Page 14 E30SO75ESS within the side heating element unit, the thermal cut-out will at approximately the selected temperature. When the convec- ο ο open at 302 F (150 C) causing the oven to shut down. When tion time reaches 0, the heating elements are de-energized the thermal cut-out has cooled, the thermal cut-out closes and the convection fan stops operating and the oven shuts off.

  • Page 15: Troubleshooting Guide

    E30SO75ESS ing operation is selected by the control unit. 1-4. The signal from damper switch is re-sensed in the control unit and shut-off relay (RY4) is turned off. Microwave Cooking: 1-5. The 240 volts A.C. to the damper motor is removed Damper is in the open position, because a portion of cooling and the motor turns off.
  • Page 16 E30SO75ESS (CONVECTION, SPEED BAKE/ CONDITION OFF CONDITION COOKING CONDITION (MICROWAVE) GRILL/ROAST) POSSIBLE CAUSE DEFECTIVE PARTS MAGNETRON POWER TRANSFORMER H.V. RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR SECONDARY INTERLOCK SWITCH PRIMARY INTERLOCK SYSTEM MONITOR SWITCH MONITOR FUSE MAGNETRON TEMPERATURE FUSE THERMAL CUT-OUT (TOP)

  • Page 17: Test Procedure

    E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY TEST 1. Disconnect the power supply cord. 2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”. 3. Open the oven door and block it open. 4. Discharge the high voltage capacitor.
  • Page 18 E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER transformer because the primary coil (thermostat) has opened. An open primary coil (thermostat) indicates overheating of the power transformer. Check for restricted air flow to the power transformer, especially the fan motor (power transformer side).
  • Page 19 E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER PRIMARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH 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 the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch.
  • Page 20 E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY, SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONI- TOR SWITCH FOR PROPER OPERATION. If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must be replaced with "monitor fuse and monitor switch assembly", even if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch.
  • Page 21 E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERA- TURE, REPLACE THERMAL CUT-OUT. THERMAL CUT-OUT (SIDE HEATER) TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open.
  • Page 22 E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 3. Open the oven door and block it open. 4. Discharge the high voltage capacitor. 5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”. 6. Disconnect connector-E from the control unit. Measure the resistance of the thermistor with an ohmmeter.
  • Page 23 E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CONVECTION MOTOR CAPACITOR 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. Disconnect input leads and check for short or open between the terminals using an ohmmeter.
  • Page 24 E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER In this service manual, troubleshooting by unit replacement is described according to the symptoms indicated. Before testing, 1) Disconnect the power supply cord, and then remove outer case. 2) Open the door and block it open.
  • Page 25 E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY 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. Disconnect the leads to the primary of the power transformer.
  • Page 26 E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER arrows. And touch the number pad 5. And then touch the start pad. (3) The oven is in Defrost cooking condition. (4) The oven will operate as follows. WEIGHT 1ST STAGE 2ND STAGE...
  • Page 27 E30SO75ESS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER NOISE FILTER 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. Disconnect the leads to the primary of the power transformer.

  • Page 28: Touch Control Panel

    E30SO75ESS TOUCH CONTROL PANEL DIAGRAM The touch control section consists of the following units as shown in the touch control panel circuit. (1) Backlight LED function (2) LED function. (3) KEY function...
  • Page 29 E30SO75ESS...
  • Page 30 E30SO75ESS...
  • Page 31 E30SO75ESS TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components 4) Re-install the outer case (cabinet). This unit uses CMOS LSI in the integral part of the circuits. 5) Re-connect the power supply cord after the outer case When handling these parts, the following precautions should is installed.

  • Page 32: Precautions For Using Lead-Free Solder

    E30SO75ESS PRECAUTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder “Main PWB” of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.

  • Page 33: Component Replacement And Adjustment Procedure

    E30SO75ESS COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST 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) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
  • Page 34 E30SO75ESS CAUTION 1. DISCONNECT THE OVEN FROM THE POWER SUPPLY BEFORE REMOVING THE OUTER CASE CABINET. 2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR Special screw WIRING. Screw Driver NOTE (Type: TORX T20 H or When replacing the outer case cabinet, the two (2)
  • Page 35 E30SO75ESS 8. Remove the two (2) screws holding the transformer bottom plate. mounting angle to the bottom plate from under the 10.Remove the four (4) screws holding the power transformer bottom plate. to the transformer mounting angle. 9. Remove the two (2) screws holding the transformer 11.Now, the power transformer is free.
  • Page 36 E30SO75ESS SOLID-STATE RELAY (MAGNETRON SIDE) REMOVAL 1. Disconnect the power supply cord. 7. Release the main wire harness from the hole of the 2. Remove the outer case cabinet, referring to “OUTER magnetron separator. CASE CABINET REMOVAL”. 8. Remove the three (3) screws holding the magnetron 3.
  • Page 37 E30SO75ESS bottom plate. 32.Now, the convection duct assembly is free. 30.Remove the thirteen (13) screws holding the convection 33.Remove the nine (9) screws holding the heater duct duct to the oven cavity and the heater duct upper. upper to the oven cavity.

  • Page 38: Door Replacement And Adjustment

    E30SO75ESS 3. Open the oven door and block it open. 3. Reconnect the wire leads to the switch. 4. Discharge the high voltage capacitor. 4. Make sure that the monitor switch is operating properly 5. Disconnect the wire leads from the switch.

  • Page 39: Door Disassembly

    E30SO75ESS 5. Close the door. cavity front plate. 6. Remove the two (2) door springs from the door cam right, 3. Reinstall the outer case cabinet and check for microwave oven hinge right, door com left and oven hinge left.

  • Page 40: Cpu Unit Circuit

    E30SO75ESS CHOKE COVER 22.Pull out the two (2) handle pins from the two (2) handle levers. 8. Insert a putty knife (thickness of about 0.5 mm) into the 23.Remove the two (2) handle levers from the door panel. gap between the choke cover and the door panel assembly 24.Now, the door panel is free.

  • Page 41: Pictorial Diagram

    E30SO75ESS...

  • Page 42: Power Unit Circuit

    E30SO75ESS Figure S-2. Power Unitl Circuit...
  • Page 43 E30SO75ESS...

  • Page 44: Parts List

    E30SO75ESS PARTS LIST Note: The parts marked "Δ Δ Δ Δ Δ " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY ELECTRICAL PARTS QSW-MA085WRE0 Secondary interlock/door sensing/damper switch...
  • Page 45 E30SO75ESS REF. NO. PART NO. DESCRIPTION Q'TY PCUSUA601WREZ Cushion PCUSGA603WREZ Cushion PFPF-A225WRPZ Thermal insulation L PSKR-A377WRFZ Rear separator PFPF-A227WRPZ Thermal insulation Upper PFPF-A228WRPZ Thermal insulation Bottom PGLSPA579WRZZ Lamp glass PPACGA189WREZ Silcon packing PREFHA069WRPZ Thermal cover Upper PREFHA078WRWZ Thermal cover Left...
  • Page 46 E30SO75ESS REF. NO. PART NO. DESCRIPTION Q'TY TCAUAB048MRR0 DHHS caution label TCAUHB008MRR0 User caution label PZET-A011WRE0 Thermal insulator LHLDWA029WRE0 Cord holder LHLDWA013WRE0 Purse lock LL ************* Shipping side angel L (Not replaceable part) ************* Shipping side angel R (Not replaceable part)
  • Page 47 E30SO75ESS...
  • Page 48 E30SO75ESS CONTROL PANEL PARTS DOOR PARTS...

  • Page 49: Packing And Accessories

    E30SO75ESS MISCELLANEOUS Actual wire harness may be different than illustration. 20-pin wire harness 128 Pursu lock L Main wire harness Main wire harness transformer Power unit 134 Pursu lock LL POSITION OF PURSE LOCK PACKING AND ACCESSORIES 118 LOW RACK...
  • Page 50 E30SO75ESS NOTES:...
  • Page 51 E30SO75ESS NOTES:...

  • Page 52: Electrolux Home Products, Inc

    E30SO75ESS ELECTROLUX COPYRIGHT © 2005 BY ELECTROLUX HOME PRODUCTS, INC. ALL RIGHTS RESERVED. No part of this publication may be repro- duced, stored in retrieval systems, or trans- mitted in any form or by any means, elec- tronic, mechanical, photocopying, record- ing, or otherwise, without prior written per- mission of the publisher.

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