Electrolux EI30BM55HB - 30" Microwave Oven Operating manual

#5995524393 October 2008
Technical Service Manual
Over The Range Microwave Oven

1-1
Section 1
Basic Information
Basic Information

This Manual has been prepared to provide Electrolux Service Personnel
with Operation and Service Information for ELECTROLUX MICROWAVE
OVENS, EI30BM55HB, EI30BM55HS, EI30BM55HW and EI30BM55HZ.
Table of Contents
Basic Information
1-2
Section 1 Basic Information .................................. 1-1
Table of Contents .................................................... 1-2
Safe Servicing Practices ........................................ 1-3
Warnings and Safety Information .......................... 1-4
Precautions To Be Observed Before And During
Servicing To Avoid Possible Exposure To Excessive
Microwave Energy .................................................. 1-5
Before Servicing ...................................................... 1-5
Danger Caution High Voltage ................................ 1-5
Before Servicing ...................................................... 1-6
Microwave Measurement Procedure .................... 1-7
Product Specification.............................................. 1-8
Grounding Instructions .......................................... 1-9
Oven Diagram .......................................................... 1-10
Section 2 Operation ................................................ 2-1
Operating Sequence Description .......................... 2-2
Hot Air Exhaust Ventilation Methods .................... 2-4
Oven Schematic-Off Condition .............................. 2-5
Oven Schematic-Cooking Condition .................... 2-5
Component Descriptions........................................ 2-6
Touch Control Panel Operation.............................. 2-7
Humidity Sensor Circuit.......................................... 2-8
Section 3 Troubleshooting and Testing ................ 3-1
Troubleshooting 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 Humidity Sensor
Replacement ............................................................ 4-8
Power Transformer Removal .................................. 4-9
Hood Fan Thermostat (60ºC ON and
70ºC Off) Removal .................................................. 4-9
Turntable Motor Removal........................................ 4-9
Cooling Fan Motor Removal .................................. 4-10
Positive Lock ® Connector (No-Case Type).......... 4-11
Oven Lamp Removal .............................................. 4-11
Cook Top Lamp Socket .......................................... 4-11
Stirrer Antenna Motor Removal ............................ 4-11
Stirrer Cover and Stirrer Antenna
Installation................................................................ 4-12
Right Panel Assembly and Power Unit
Removal.................................................................... 4-12
Door Sensing Switch, Secondary Interlock Switch
and Monitor Switch Removal ................................ 4-12
Door Sensing Switch, Secondary Interlock Switch
and Monitor Switch Adjustment ............................ 4-13
Door Replacement .................................................. 4-14
Door Disassembly .................................................. 4-15
Section 5 Wire Diagrams ........................................ 5-1
Pictorial Diagram .................................................... 5-2
Power Unit Circuit.................................................... 5-3
Glass Touch Key Unit and Display Unit Circuit .... 5-4
Printed Wiring Board .............................................. 5-5

Basic Information
1-3
Safe Servicing Practices
Avoid personal injury and/or property damage by observing important Safe Servicing Practices.
Following are some limited examples of safe practices:
1. DO NOT attempt a product repair if you have any doubts as to your ability to complete the repair in a safe
and satisfactory manner.
2. Always Use The Correct Replacement Parts as indicated in the parts documentation. Substitutions may
defeat compliance with Safety Standards Set For Home Appliances. Do not exceed maximum recom-
mended wattage on light bulb replacements. Doing so could blow fuses and/or damage transformers.
3. Before servicing or moving an appliance:
• Remove power cord from the electrical outlet, trip circuit breaker to the OFF position, or remove fuse.
4. Never interfere with the proper operation 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 safety grounds prior to completion of service. Failure to do so will
create a hazard.
7. Prior to returning the product to service, ensure that:
• All electrical connections are correct and secure.
• All electrical leads are properly dressed and secured away from sharp edges, high- temperature
components, and moving parts.
• 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.

Basic Information
1-4
WARNING
THIS SERVICE MANUAL IS INTENDED FOR USE BY PERSONS HAVING ELECTRICAL AND
MECHNICAL 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.
WARNING
NEVER OPERATE THE OVEN UNTIL THE FOLLOWING POINTS ARE ENSURED.
(A) THE DOOR IS TIGHTLY CLOSED.
(B) THE DOOR BRACKETS AND HINGES ARE NOT DEFECTIVE.
(C) THE DOOR PACKING IS NOT DAMAGED.
(D) THE DOOR IS NOT DEFORMED OR WARPED.
(E) THERE IS NO 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
TRANSFORMER, HIGH VOLTAGE RECTIFIER, HEAT SINK, ETC., AND MAGNETRON, HIGH VOLTAGE
HARNESS ETC.;
IF PROVIDED, VENT HOOD, FAN ASSEMBLY, COOLING FAN MOTOR.
ALL THE PARTS MARKED “*” ON PARTS LIST ARE USED AT VOLTAGES MORE THAN 250V.
REMOVAL OF THE OUTER WRAPPER GIVES ACCESS TO VOLTAGE ABOVE 250V.
ALL THE PARTS MARKED “Ä” ON PARTS LIST MAY CAUSE UNDUE MICROWAVE EXPOSURE, BY
THEMSELVES, OR WHEN THEY ARE DAMAGED, LOOSENED OR REMOVED.

Basic Information
1-5
Precautions To Be Observed Before And During Servicing To
Avoid Possible Exposure To Excessive Microwave Energy
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal
and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches,
(5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission 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 adjusted by procedures described in this manual
before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be per
formed on each oven prior to release to the owner.
Before Servicing
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. and Food and Drug Administration's Center for
Devices and Radiological Health immediately.
Service personnel should inform Electrolux HOME PRODUCTS, INC. of any certified unit found with
emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit until the
oven has been brought into compliance.
Danger Caution HIGH VOLTAGE
Do not energize a microwave oven with the outer case cabinet removed, because a microwave oven
generates High Voltage in the circuit.
If you intend to operate the oven employing the high frequency switching power converter circuit, you should
take special precautions to avoid an electrical shock hazard.
The high voltage transformer, high voltage capacitor and high voltage diode have energized high voltage
potential approx. 8 KV.
The aluminium heat sink is connected to the switching power transistor Collector pole, and has an energized
high voltage potential approx. 650V peak.
DO NOT ACCESS THE HIGH VOLTAGE TRANSFORMER , HIGH VOLTAGE CAPACITOR , HIGH VOLTAGE
DIODE AND HEAT SINK WHEN THE POWER SUPPLY IS CONNECTED TO AN ELECTRICAL OUTLET.

Basic Information
1-6
Before Servicing
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.
Whenever troubleshooting is performed the power
supply must be disconnected. It may in, some cases,
be necessary to connect the power supply 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 these leads remain isolated from
other components and oven chassis by using
insulation tape.
6. After that procedure, reconnect the power supply
cord.
When the testing is completed,
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. Reconnect the leads to the primary of the
inverter unit.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer
case is installed.
7. Run the oven and check all functions.
After repairing
1. Reconnect all leads 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 for two (2)
minutes. When the two minutes has elapsed
(timer at zero) carefully check that the water is
now hot. If the water remains cold carry out
Before Servicing procedure and re-examine
the connections to the component being tested.
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 CAPACITOR,
HIGH VOLTAGE POWER TRANSFORMER, HIGH VOLTAGE
RECTIFIER, HEAT SINK ETC., AND MAGNETRON, HIGH VOLTAGE
HARNESS ETC..
READ THE SERVICE MANUAL CAREFULLY AND FOLLOW ALL
INSTRUCTIONS.
WARNING
THE HIGH-VOLTAGE CAPACITOR REMAINS
CHARGED ABOUT 60 SECONDS AFTER THE
OVEN HAS BEEN SWITCHED OFF. WAIT FOR
60 SECONDS AND THEN SHORT-CIRCUIT THE
CONNECTION OF THE HIGH-VOLTAGE
CAPACITOR (THAT IS THE CONNECTING LEAD
OF THE HIGH-VOLTAGE RECTIFIER) AGAINST
THE CHASSIS WITH THE USE OF AN
INSULATED SCREWDRIVER.
Don't Touch !
Danger High Voltage

Basic Information
1-7
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 1 mW/cm2 at any point 5cm or more from the external surface of
the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the
oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
2) Safety interlock switches: Primary interlock switch shall prevent microwave radiation emission in
excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave
radiation emission in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the
oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the
performance standard for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20o±5C (68oF) in the center of the oven
cavity. The water 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 and select a cook cycle of several minutes. If the water begins to boil before the
survey is completed, replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and
the body of the oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the
maximum indication on the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the
continuity of the metal has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is
permitted by the closed latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater
than 4mW/cm2, and that the primary interlock switch and secondary interlock switch do turn the oven
OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.

Basic Information
1-8
Product Specification
Item Description
Power Requirements 120 Volts / 14.2 Amperes
60 Hertz
Single phase, 3 wire grounded
Power Output 1000 watts (IEC TEST PROCEDURE)
Operating frequency of 2450MHz
Case Dimensions Width 29-15/16"
Height 17-1/16"
Depth 14- 31/32"
Cooking Cavity Dimensions Width 22-1/2"
Height 10-1/16"
2.1 Cubic Feet Depth 14-31/32"
Hood lamp 40W x 1, Krypton light bulb
Hood fan Approx. High - 300 C.F.M. / Low - 270 C.F.M.
Control Complement Touch Control System
Clock ( 1:00 - 12:59 )
Timer (0 - 99 min. 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
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,
Soften, Melt, Warm, Keep Warm, Cook, Defrost, Power Level,
Numer selection pads, Power Level pad, Timer/Clock pad,
Stop/Clear pad, User Pref, Start Add a Minute pad, Light, Fan
Oven Cavity Light 40W x 1, Krypton light bulb
Safety Standard UL Listed FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
Canadian Standards Association
Health CANADA, Industry Canada
Weight Approx. 61 lbs.