Bertazzoni MO30STANE User Manual

BERTAZZONI SERVICE MANUAL

S31M332MO30ST

MICROWAVE OVEN

MO30 STA NE

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 the following parts may result in a severe, possibly fatal, electrical shock. (Inverter unit that includes High Voltage Capacitor, High Voltage Power Transformer, High Voltage Rectiﬁer and Heat sink etc., and Magnetron, High Voltage Harness etc..)

TABLE OF CONTENTS

Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO

AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY .......................................................... 2

BEFORE SERVICING ............................................................................................................................................ 2

WARNING TO SERVICE PERSONNEL ................................................................................................................. 4

MICROWAVE MEASUREMENT PROCEDURE ..................................................................................................... 5

FOREWORD AND WARNING ............................................................................................................................... 7

PRODUCT SPECIFICATIONS ...............................................................................................................................8

GENERAL INFORMATION.................................................................................................................................... 8

OPERATION ......................................................................................................................................................... 10

TROUBLESHOOTING GUIDE ............................................................................................................................. 14

TEST PROCEDURE ............................................................................................................................................ 15

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE.................................................................26

PICTORIAL DIAGRAM ......................................................................................................................................... 32

PARTS LIST ........................................................................................................................................................ 33

PACKING AND ACCESSORIES ..........................................................................................................................37

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

MO30 STA NE

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.

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 performed

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 BERTAZZONI immediately @ (English/Spanish) 1-866-905-0010 or (French) 1-800561-7625.

If the unit operates with the door open, service person should 1) tell the user not to operate the oven and 2) contact BERTAZZONI and Food and Drug Administration's Center for Devices and Radiological Health immediately.

Service personnel should inform BERTAZZONI 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.

Notes

MO30 STA NE

WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts fatal, electrical shock.

(Example) High Voltage Capacitor, High Voltage Power

Transformer, Magnetron, High Voltage Rectiﬁer Assembly, High Voltage Harness etc..

Read the Service Manual carefully and follow all instructions.

may result in a severe, possibly

Don't Touch ! Danger High Voltage

Before Servicing

1. Disconnect the power supply cord , and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

WARNING: RISK OF ELECTRIC SHOCK.

DISCHARGE THE HIGH-VOLTAGE CAPACITOR BEFORE SERVICING.

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.

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. Discharge high voltage capacitor.

4. Disconnect the leads to the primary of the power transformer.

5. Ensure that the 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. Discharge high voltage capacitor.

4. Reconnect the leads to the primary of the power transformer.

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 cup of 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.

When all service work is completed and the oven is fully assembled, the microwave power output should be checked and a microwave leakage test should be carried out.

MO30 STA NE

MICROWAVE MEASUREMENT PROCEDURE (CANADA)

After adjustment of the door switches are completed individually or collectively, switch test and microwave leakage test must be performed with survey instrument and test result must be conﬁrmed to meet the requirement of the performance standard for microwave ovens as undermentioned.

A. Requirements:

Every microwave oven shall function in such a manner that when the oven is fully assembled and operating with its service controls and user controls adjusted to yield the maximum output, the leakage radiation, at all points at least 5 cm. from the external surface of the oven, does not exceed:

1) 1.0mW/cm2 with the test load of 275 ± 15 ml of water at an initial temperature 20 ±5oC.

2) 5.0mW/cm

when the outer enclosure is removed with a test load of 275 ± 15 ml of water at an initial temperature

20±5oC.

3) 5.0mW/cm

without a test load.

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 CSA and NHW performance standard for microwave ovens must be used for testing recommended instruments are , NARDA 8100 and NARDA 8200.

2) Place the oven tray in the oven cavity.

3) Place the load of 275±15 ml of tap water initially at 20±5oC in the center of the oven cavity. The water container shall be a low form of 600 ml 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, 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 with enclosure installed :

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 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 secondary interlock switch does turn the oven OFF before any door movement.

C. Leakage test without enclosure:

1) Remove the enclosure (cabinet).

2) Grasp the probe of the survey instrument and hold it perpendicular to all mechanical and electric parts of the oven that is accessible to the user of the oven including, but not limited to, the waveguide, cavity seams, magnetron gap between the door and the body of the oven.

3) Move the probe slowly, not faster than 2.5 cm/sec. along the gap, watching for the maximum indication on the meter.

4) Measure carefully at the point of highest leakage and make sure that the highest leakage is under 5mW/cm2.

CAUTION: Special attention should be given to avoid electrical shock because HIGH VOLTAGE is generated during this

test

No Load test

1) Operate the oven without a load and measure the leakage by the same method as the above test procedure " Leakage test with enclosure installed"

2. Make sure that the highest leakage should not exceed 5mW/cm2.

NOTE: After servicing, record data on service invoice and microwave leakage report.

MO30 STA NE

MICROWAVE MEASUREMENT PROCEDURE (USA)

A. Requirements:

1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/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 relay switch shall prevent microwave radiation emission in excess of the requirement as above mentioned. Secondary interlock relay and door sensing switch shall prevent microwave radiation emission in excess

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 20±5

C (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/secondary interlock relay does turn the oven OFF before any door movement.

NOTE: After servicing, record data on service invoice and microwave leakage report.

SERVICE MANUAL

BERTAZZONI

MO30 STA NE

MICROWAVE OVEN

MO30 STA NE

FOREWORD

This Manual has been prepared to provide BERTAZZONI Service Personnel with Operation and Service Information for the BERTAZZONI MICROWAVE OVEN.

It is recommended that service personnel carefully study the entire text of this manual so that they will be qualiﬁed to render satisfactory customer service.

Check the interlock switches and the door seal carefully. Special attention should be given to avoid electrical shock and microwave radiation hazard.

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.

DANGER

Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing. Service personnel - Do not contact the following parts while the appliance is energized; High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectiﬁer Assembly, High Voltage Harness; If provided, Vent Hood, Fan assembly, Cooling Fan Motor.

PRODUCT DESCRIPTION

GENERAL INFORMATION

OPERATION

TROUBLESHOOTING GUIDE AND TEST PROCEDURE

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WIRING DIAGRAM

PARTS LIST

All the parts marked “*” on parts list are used at voltages more than 250V.

Removal of the outer wrap gives access to voltage above 250V.

All the parts marked “∆” on parts list may cause undue microwave exposure, by themselves, or when they are damaged, loosened or removed.

1503 South Coast Drive, Suite 320

Costa Mesa, CA 92626

MO30 STA NE

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 120 Volts / 13.0 Amperes/1500Watts 60 Hertz Single phase, 3 wire grounded

Power Output 1100 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz

Case Dimensions Width 24" Height 13-3/8" Depth 19-1/4"

Cooking Cavity Dimensions Width 17-3/8"

2.0 Cubic Feet Height 10-1/2" Depth 18-5/8" Tray Size 15"

Control Complement Touch Control System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min. 99 seconds)

Microwave Power for Variable Cooking

Repetition Rate;

P-HI .................................................. Full power throughout the cooking time

P-90 ..................................................................... approx. 90% of Full Power

P-80 ..................................................................... approx. 80% of Full Power

P-70 ..................................................................... approx. 70% of Full Power

P-60 ..................................................................... approx. 60% of Full Power

P-50 ..................................................................... approx. 50% of Full Power

P-40 ..................................................................... approx. 40% of Full Power

P-30 .................................................................... approx. 30% of Full Power

P-20 ..................................................................... approx. 20% of Full Power

P-10 ..................................................................... approx. 10% of Full Power

P-0 ..................................................... No power throughout the cooking time

Sensor Cooking Pads: Popcorn, Reheat, Help, Fresh Vegetables, Rice, Baked Potatoes, Ground Meat, Poultry, Fish Seafood.

Frozen Foods: Entrees, Snacks, Vegetables. Menu Options: Breakfast, Lunch, 15 Minute Recipes, Defrost, From the

Pantry, Beverages. Standard Options: Number pads, Timer Clock, Keep Warm, Add a

Cavity Light Yes

Safety Standard CUL Listed FCC Authorized

DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J and Canadian Standards Association. Health CANADA.

Minute, Power Level, Stop/Clear.

GENERAL 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.

WARNING: Improper use of the grounding plug can result in a risk of electric shock.

Electrical Requirements The electrical requirements are a 120 volt 60 Hz, AC only, 15 or 20 amp. fused electrical supply. It is recommended that a separate circuit serving only this appliance be provided.

MO30 STA NE

When installing this appliance, observe all applicable codes and ordinances. A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord. Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to contact a qualiﬁed electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding adapter properly grounded and polarized. If the extension cord must be used, it should be a 3-wire, 15 amp. or higher rated cord. Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally.

CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM

1. One touch door open button. Push to open door.

2. Door latches. The oven will not operate unless the

door is securely closed.

3. Removable turntable support.

4. Removable turntable. The turntable will rotate clockwise or

counterclockwise.

5. Oven lamp. It will light when oven is operating or

door is opened.

6. Oven door with see-through window.

7. Ventilation openings. (Rear)

8. Auto-Touch control panel.

9. Time display: Digital display, 99 minutes 99 seconds.

OVEN DIAGRAM

10. Turn table motor shaft

11. Wave guide cover.

12. Power supply cord

TOUCH CONTROL PANEL

NOTE: The directed features are disabled after one minute when the oven is not in use. These features are automatically enabled when the door is opened and closed or the STOP/ CLEAR pad is pressed.

MO30 STA NE

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

The following is a description of component functions during oven operation.

OFF CONDITION

Closing the door activates the door sensing switch and secondary interlock switch. (In this condition, the monitor switch contacts are opened.) When oven is plugged in, 120 volts A.C. is supplied to the control unit. (Figure O-1).

1. The display will show ﬂashing"WELCOME, PRESS CLEAR and PRESS CLOCK" To set any program or set the clock, you must ﬁrst touch

the STOP/CLEAR pad. The display will clear, and " : " will appear.

COOKING CONDITION

Program desired cooking time by touching the NUMBER pads. Program the power level by touching the POWER LEVEL pad and then a Number pad. When the START pad is touched, the following operations occur:

1. The contacts of relays are closed and components connected to the relays are turned on as follows.

(For details, refer to Figure O-2)

7. The monitor switch electrically monitors the operation of the primary switch and primary and is mechanically associated with the door so that it will function in the following sequence.

1) When the door opens from the closed position, the primary switch, secondary switch, door sensing switch, and secondary interlock relay open their contacts and the monitor switch contacts close.

(2) When the door is closed from the open position, the

monitor switch contacts open ﬁrst. Then the contacts of the primary switch and door secondary switch close.

If the primary switch and the secondary switch primary contacts are closed when the door is opened, the monitor switch contacts form a short circuit through the monitor fuse, primary switch and secondary switch causing the monitor fuse to blow.

POWER LEVEL 0% TO 100% COOKING

When Variable Cooking Power is programmed, the 120 volts A.C. is supplied to the power transformer intermittently through the contacts of relay (RY-2) which is operated by the control unit within a 32 second time base. Microwave power operation is as follows:

RELAY CONNECTED COMPONENTS

RY-1 oven lamp/turntable motor/fan motor

RY-2 power transformer

2. 120 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3.3 volts A.C. output on the ﬁlament winding, and approximately 2370 volts A.C. on the high voltage winding.

3. The ﬁlament winding voltage heats the magnetron ﬁlament and the H.V. winding voltage is sent to a voltage doubler circuit.

4. The microwave energy produced by the magnetron is channelled through the waveguide into the cavity feedbox, and then into the cavity 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, the monitor switch, secondary switch, door sensing switch, primary switch and secondary interlock relay are activated with the following results. The circuits to the turntable motor, the cooling fan motor, and the high voltage components 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.

VARI-MODE ON TIME OFF TIME

100% power 32 sec. 0 sec.

approx. 90% power 30 sec. 2 sec.

approx. 80% power 26 sec. 6 sec.

approx. 70% power 24 sec. 8 sec.

approx. 60% power 22 sec. 10 sec.

approx. 50% power 18 sec. 14 sec.

approx. 40% power 16 sec. 16 sec.

approx. 30% power 12 sec. 20 sec.

approx. 20% power 8 sec. 24 sec.

approx. 10% power 6 sec. 26 sec.

0% power

0 sec. 32 sec.

Note: The ON/OFF time ratio does not correspond with the

percentage of microwave power, because approx. 2 seconds are needed for heating of the magnetron ﬁlament.

SENSOR COOKING CONDITION

MICROWAVE

AH SENSOR

Using the SENSOR function, the food is cooked without ﬁguring time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best results. When the food is cooked, water vapor is developed. The sensor “senses” the vapor and its resistance increases gradually. When the resistance reaches the value set according to the menu, supplementary cooking is started.

The time of supplementary cooking is determined by experiment with each food category and inputted into the LSI. An example of how sensor works: (BAKED POTATOES)

1. Potatoes at room temperature. Vapor is emitted very slowly.

MO30 STA NE

Cooking Sequence.

1. Touch one of the SENSOR pads and then touch the Start pad.

NOTE: The oven should not be operated on SENSOR

immediately after plugging in the unit. Wait two minutes before cooking on SENSOR.

2. The coil of shut-off relay (RY-1) is energized, the turntable motor, oven lamp and cooling fan motor are turned on, but the power transformer is not turned on.

3. After about 16 seconds, the cook relay (RY-2) is energized. The power transformer is turned on, microwave energy is produced and ﬁrst stage is started.

The 16 seconds is the cooling time required to remove

any vapor from the oven cavity and sensor.

NOTE: During this ﬁrst stage, do not open the door or touch

STOP/CLEAR pad.

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. When the timer reaches zero, an audible signal sounds. The shut-off relay and cook relay are de-energized and the power transformer, oven lamp, etc. are turned off.

6. Opening the door or touching the STOP/CLEAR pad, the time of day will reappear on the display and the oven will revert to an OFF condition.

2. Heat Potatoes. Moisture and humidity is emitted rapidly. You can smell the aroma as it cooks.

3. Sensor detects moisture and humidity and calculates cooking time and variable power.

MO30 STA NE

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. CLOCK APPEARS ON DISPLAY

120V A C 60 Hz

GR N

SCHEMATIC

MON ITO R

FU S E

NO IS E S UPP R E S SI ON CO IL

LIN E C RO S S CA PA CIT OR

NOTE: 1.

PR I MAR Y S WIT CH

N.O .

CO M.

(R Y -1)

CO M.

T T M

CO M.

F M

(R Y -2)

N.O .

S EC O NDAR Y INT E R LOC K R E LAY

MAG NE T RO N

TE MP .

FU S E

CA VIT Y

TE MP .

FU S E

0 .0033 uF/AC 12 5V

0 .22uF /AC 250V

LIN E BY P AS S C APA CI TO R LI NE B YP AS S C AP ACI TO R

0 .0033 uF/AC 12 5V

CO NT R OL UNI T

CIRCUITS SUBJECT TO CHANGE WITHOUT NOTICE WIRE COLOR CODES ARE APPLICABLE TO PRIMARY CIRCUIT ONLY AND NOT

2. APPLICABLE TO LOW VOLTAGE CIRCUIT AND SECONDARY CIRCUIT.

*3. HOT WIRE(S) MUST BE CONNECTED TO THE TERMINAL WITH BLUE MARK

ON THE LAMP SOCKET AND "H" MARK ON THE POWER SUPPLY CORD.

S EC O NDAR Y S WIT CH

N.O .CO M.

CA PA CIT OR 1.0 µF AC 230 0V

PO WE R TR AN S FO RM ER

H.V . R EC T IFIE R

N.O .

DO OR S EN S ING S WIT CH

CO M.

N.C .

MON ITO R S WIT CH

CO M.

MAG NE T RO N

120V A C 60 Hz

NO IS E FIL TE R U NIT

Figure O-1 Oven Schematic - Off Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. COOKING TIME PROGRAMMED

3. VARIABLE COOKING CONTROL "HIGH"

4. "START" PAD TOUCHED

MON ITO R

FU S E

GR N

NO IS E S UPP R E S SI ON CO IL

LIN E C RO S S CA PA CIT OR

0 .22uF /AC 250V

LIN E BY P AS S C APA CI TO R LIN E B YP AS S C AP ACI TO R

MAG NE T RO N

TE MP .

FU S E

CA VIT Y

TE MP .

FU S E

0 .0033 uF/AC 12 5V

CO M.

CO NT R OL UNI T

PR I MAR Y S WIT CH

(R Y -1)

CO M.

N.O .

T T M

CO M.

NOTE: 1.

CIRCUITS SUBJECT TO CHANGE WITHOUT NOTICE WIRE COLOR CODES ARE APPLICABLE TO PRIMARY CIRCUIT ONLY AND NOT

2. APPLICABLE TO LOW VOLTAGE CIRCUIT AND SECONDARY CIRCUIT.

*3. HOT WIRE(S) MUST BE CONNECTED TO THE TERMINAL WITH BLUE MARK

ON THE LAMP SOCKET AND "H" MARK ON THE POWER SUPPLY CORD.

S EC O NDAR Y S WIT CH

N.O .CO M.

F M

DO OR S EN S ING S WIT CH

N.O .

CO M.

(R Y -2)

N.O .

S EC O NDAR Y INT E R LOC K R E LAY

CO M.

AH S EN SO R

MON ITO R S WIT CH

N.C .

CA PA CIT OR 1.0 µF AC 230 0V

PO WE R TR AN S FO RM ER

H.V . R EC T IFIE R

MAG NE T RO N

NO IS E FIL TE R U NIT

Figure O-2 Oven Schematic - Cooking Condition

DESCRIPTION AND FUNCTION OF COMPONENTS

Switch Lever

DOOR OPEN MECHANISM

The door is opened by pushing the open button on the control panel, refer to the Figure D-1. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch head. The latch heads are moved upward and released from latch hook. Now the door will open.

Latch Heads

3. If the door is opened, primary switch and contacts fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOR

FUSE, TEST MONITOR SWITCH AND PRIMARY SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").

NOTE: MONITOR FUSE, AND MONITOR SWITCH ARE

REPLACED AS AN ASSEMBLY.

MO30 STA NE

Door

Door Sensing Switch

Monitor Switch

Secondary Switch

Primary Switch

Figure D-1. Door Open Mechanism

PRIMARY SWITCH, SECONDARY SWITCH & DOOR SENSING SWITCH

The primary switch and secondary switch mounted parrallel to each other horizontally in the lower positions of the latch hook, the door sensing switch is mounted horizontally in the upper position of the latch hook. They are activated by the latch head on the door. When the door is opened, the switches interrupt the power to all high voltage components, except the oven lamp . A cook cycle cannot take place until the door is ﬁrmly closed thereby activating all interlock switches. The secondary interlock system consists of the door sensing switch and the secondary interlock relay located on the control circuit board.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) by the latch head on the door while the door is closed. The switch is intended to render the oven inoperative, by means of blowing the monitor fuse, when the contacts of the primary switch fail to open when the door is opened.

TURNTABLE MOTOR

The turntable motor rotates the turntable located on the bottom of the oven cavity, so that the foods on the turntable cook evenly during cooking. The turntable may turn in either direction.

COOLING FAN MOTOR

The cooling fan motor drives a blade which draws external cool air. This cool air is directed through the air vanes surrounding the magnetron and cools the magnetron. This air is channelled through the oven cavity to remove steam and vapors given off from the heating foods. It is then exhausted through the exhausting air vents at the oven cavity.

MONITOR FUSE

1. The monitor fuse blows when the contacts (COM-NO) of the primary switch remain closed with the oven door open and when the monitor switch closes.

2. If the wire harness or electrical components are shortcircuited, this monitor fuse blows to prevent an electric shock or ﬁre hazard.

CAVITY TEMPERATURE FUSE

The cavity temperature fuse located on the top of the oven cavity, is designed to prevent damage to the oven by ﬁre. If the food load is overcooked, by either error in cook time or defect in the control unit, the cavity temperature fuse will open. Under normal operation, the cavity temperature fuse remains closed. However, when abnormally high temperatures are reached within the oven cavity, the cavity temperature fuse will open at 302oF(150oC) causing the oven to shut down. NOTE: This is fuse. It does not reset.

Functions:

1. When the door is opened, the monitor switch contact

2. As the door goes to a closed position, the monitor switch

close (to the ON condition) due to their being normally closed. At this time the secondary interlock relay, primary switch and secondary switch are in the OFF condition (contacts open) due to their being normally open contact switches.

contacts are ﬁrst opened and then the door sensing switch, primary switch and secondary switch contacts close. (On opening the door, each of these switches operate inversely.)

MAGNETRON TEMPERATURE FUSE

The magnetron temperature fuse located near the magnetron is designed to prevent damage to the magnetron if an over heated condition develops in the tube due to cooling fan failure, obstructed air guide, dirty or blocked air intake, etc. Under normal operation, the magnetron temperature fuse remains closed. However, when abnormally high temperatures are reached within the magnetron, the magnetron temperature fuse will open at 302oF(150oC) causing the oven to shut down. NOTE: This is fuse. It does not reset.

MO30 STA NE

TROUBLESHOOTING GUIDE

Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.

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 primary switch, and monitor

switch, before replacing the monitor fuse. If the monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA016/KIT as an assembly.

IMPORTANT: Whenever troubleshooting is performed 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. Discharge high voltage capacitor.

4. Disconnect the leads to the primary of the power transformer.

5. Ensure that the 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. Discharge high voltage capacitor.

4. Reconnect the leads to the primary of the power transformer.

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.

CK = Check / RE = Replace

SHORT IN POWER CORD

SHORT OR OPENED WIRING

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

CAVITY TEMPERATURE FUSE

MAGNETRON TEMP FUSE

SECONDARY INTERLOCK SYSTEM

PRIMARY INTERLOCK RELAY

MONITOR SWITCH

BLOWN MONITOR SWITCH TEST

COOLING FAN MOTOR

TURNTABLE MOTOR

TOUCH CONTROL PANEL

WRONG OPERATION

LOW VOLTAGE

DIRTY OVEN CAVITY

KEY UNIT

RELAY (RY1)

AH SENSOR

Home fuse or circuit breaker blows when power cord is plugged into wall 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.

Oven lamp lights but fan motor and turntable motor do not operate.

Oven does not go into cook cycle when START pad is touched

Oven seems to be operating but little or no heat is produced in oven load. (Food incompletely cooked or not cooked at all at end of cook cycle.)

Oven goes into a cook cycle but extremely uneven heating is produced in oven load (food).

Oven does not cook properly when programmed for P-50/ 50 PERCENT mode. (Operates properly on P-HI/ 100 PERCENT mode.)

Oven goes into Defrost but food

is not defrosted well.

AH sensor does not end during Sensor cooking condition. (Oven does not shut off after a cup of water is boiling by sensor cooking.)

Oven stops at 16 sec. or error displays after starting.

RE RE

A B C D E E F F G H

RE RE

CK CK

J K

TEST PROCEDURE

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

COOKING

CONDITION

PROBLEM

OFF

CONDITION

SENSOR

COOKING

CONDITION

COMPU DEFROST TEST

NOISE FILTER

MO30 STA NE

PROCEDURE LETTER

A MAGNETRON ASSEMBLY TEST

TEST PROCEDURES

1. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

COMPONENT TEST

MO30 STA NE

PROCEDURE LETTER

TEST PROCEDURES

COMPONENT TEST

4. 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.

5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron ﬁlament leads and chassis ground. This test should indicate an inﬁnite resistance. If there is little or no resistance the magnetron is grounded and must be replaced.

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.

MICROWAVE OUTPUT POWER

The following test procedure should be carried out with the microwave oven in a fully assembled condition (outer case ﬁtted).

HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE OBSERVED.

Power output of the magnetron can be measured by performing a water temperature rise test. This test should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following components or wiring: silicon rectiﬁer, high voltage capacitor and power transformer. This test will require a 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type temperature tester. For accurate results, the following procedure must be followed carefully:

1. Fill the measuring cup with 16 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 of the water.

2. Place the cup of water in the oven. Operate 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 temperature from the hot water temperature. The normal result should be 38 to 78

F(21 to 42.6oC) rise in temperature. If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has low power output (low rise in water temperature) which would extend cooking time or high power output (high rise in water temperature) which would reduce cooking time. Because cooking time can be adjusted to compensate for power output, the magnetron tube assembly should be replaced only if the water temperature rise test indicates a power output well beyond the normal limits. The test is only accurate if the power supply line voltage is 120 volts and the oven cavity is clean.

B POWER TRANSFORMER 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 primary input terminals and measure the resistance of the transformer with an ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be approximately 90 ohms; the resistance of the ﬁlament coil 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 VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.)

TEST PROCEDURES

PROCEDURE LETTER

C 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 the rectiﬁer from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectiﬁer terminals and observe meter reading. If a short is indicated in both directions, or if an inﬁnite resistance is read in both directions, the rectiﬁer is probably defective and should be replaced.

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: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.

D HIGH VOLTAGE 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. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open between the terminals using an ohmmeter.

Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate

continuity for a short time and should indicate an open circuit once the capacitor is charged. If the above is not the case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals and case. If it is shorted, replace the capacitor.

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.

COMPONENT TEST

MO30 STA NE

E CAVITY TEMPERATURE 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. A continuity check across the cavity temperature fuse terminals should indicate a closed circuit unless the temperature of the cavity temperature fuse reaches approximately 302oF(150oC). An open cavity temperature fuse indicates overheating of the oven, exchange the cavity temperature fuse 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 guide.

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.

MAGNETRON TEMPERATURE 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. A continuity check across the magnetron temperature fuse terminals should indicate a closed circuit unless the temperature of the magnetron temperature fuse reaches approximately 302oF(150oC). An open magnetron temperature fuse indicates overheating of the magnetron. Check for restricted air ﬂow to the magnetron, especially the cooling fan air guide.

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.

MO30 STA NE

TEST PROCEDURES

PROCEDURE LETTER

8. Run the oven and check all functions. CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,

REPLACE TEMPERATURE FUSE.

F PRIMARY AND SECONDARY SWITCH 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 the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal 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 secondary interlock 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.

SECONDARY 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.

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 door sensing switch contacts fail in the open position and the door is closed, the cooling

fan, turntable and oven light will be activated by RY1.

COMPONENT TEST

SECONDARY INTERLOCK RELAY (RY2)

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 two (2) wire leads from the male tab terminals of the Secondary Interlock Relay. Check the state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts are closed, replace the circuit board entirely or the relay itself.

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.

G MONITOR SWITCH 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. Before performing this test, make sure that the primary switch is operating properly, according to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check the continuity of the monitor circuit.

5. Reconnect all leads removed from components during testing.

TEST PROCEDURES

PROCEDURE LETTER

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.

H 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 primary switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse.

COMPONENT TEST

Screw Driver

RED

Primary Interlock Switch

WHT/WHT

Monitor Switch

Secondary Interlock Switch

MO30 STA NE

Ohmmeter

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY SWITCH AND

MONITOR 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" part number FFS-BA016/KIT, even if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and 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.

I TOUCH CONTROL PANEL ASSEMBLY TEST

The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,

unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two units, Control Unit and Key Unit, and also the Control Unit is divided into two units, LSI Unit and Power Unit, and 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.

3) Discharge high voltage capacitor.

4) Disconnect the leads to the primary of the power transformer.

5) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

6) After that procedure, re-connect the power supply cord.

1. Key Unit.

NOTE ;

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) Check Key unit ribbon connection before replacement.

5) Reconnect all leads removed from components during testing.

6) Re-install the outer case (cabinet).

7) Reconnect the power supply cord after the outer case is installed.

8) Run the oven and check all functions.

MO30 STA NE

TEST PROCEDURES

PROCEDURE LETTER COMPONENT TEST

The following symptoms indicate a defective key 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 Key unit is defective.

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) Replace the Key unit.

5) Reconnect all leads removed from components during testing.

6) Re-install the outer case (cabinet).

7) Reconnect the power supply cord after the outer case is installed.

8) Run the oven and check all functions.

2. Control Unit The following symptoms indicate a defective control unit. Before replacing the control unit, perform

the Key unit test (Procedure J) to determine if control unit is faulty.

2-1 In connection with pads.

a) When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal.

2-2 In connection with indicators

a) At a certain digit, all or some segments do not light up. b) At a certain digit, brightness is low. c) Only one indicator does not light. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong ﬁgure appears. f) A certain group of indicators do not light up. g) The ﬁgure of all digits ﬂicker. h) The following symptoms indicate a defective LSI unit.

• When touching the keys on the touch screen, a certain key produces no signal at all.

• When touching a number key on the touch screen, two ﬁgures or more are displayed.

• When touching the keys on the touch screen, sometimes a key produces no signal.

2-3 Other possible problems caused by defective control unit.

a) Buzzer does not sound or continues to sound. b) Clock does not operate properly. c) Cooking is not possible.

When testing is completed,

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) Reconnect all leads removed from components during testing.

5) Re-install the outer case (cabinet).

6) Reconnect the power supply cord after the outer case is installed.

7) Run the oven and check all functions..

J KEY UNIT 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 display fails to clear when the STOP/CLEAR pad is depressed, ﬁrst verify the ﬂat ribbon cable is making 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 sensing switch connecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond, it is faulty and must be replaced. If a speciﬁc pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.

5. Reconnect all leads removed from components during testing.

PROCEDURE LETTER

TEST PROCEDURES

COMPONENT TEST

6. Re-install the outer case (cabinet).

7. Reconnect the power supply cord after the outer case is installed.

8. Run the oven and check all functions.

MO30 STA NE

ADD A

MINUTE

15 MINUTE

RECIPES

POPCORN

FRESH

VEGETABLES

GROUND

MEAT

ENTREES

RICE

POULTRY

VEGETABLES

BEVERAGES

FROM THE

PANTRY

FISH

SEAFOOD

3 4

6 7 8 9 0

START

BREAKFAST

DEFROST

TIMER

CLOCK

POWER

LEVEL

HELP

KEEP

WARM

LUNCH

BAKED

POTATOES

SNACKS

STOP

CLEAR

REHEAT

K 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.

5. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

6. After that procedure, re-connect the power supply cord.

7. Remove the outer case and check voltage between Pin No. 1 of the 2 pin connector (A) and the common 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 and RY2 Relay Test

These relays are operated by D.C. voltage Check voltage at the relay coil with a D.C. voltmeter 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.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 24.0V D.C. Oven lamp / Turntable motor / Cooling fan motor

RY2 Approx. 23.0V D.C.

Power transformer

8. Disconnect the power supply cord, and then remove outer case.

9. Open the door and block it open.

10. Discharge high voltage capacitor.

11. Reconnect all leads removed from components during testing.

12. Re-install the outer case (cabinet).

13. Reconnect the power supply cord after the outer case is installed.

14. Run the oven and check all functions.

COMPU DEFROST TEST

WARNING : The oven should be fully assembled before following procedure. (1) Place one cup of water in the center of the turntable tray in the oven cavity. (2) Close the door, touch the Defrost pad and touch the number pad 5 twice. Then touch the start pad.

(3) The oven is in Compu Defrost cooking condition. (4) The oven will operate as follows 1ST STAGE 2ND STAGE

WEIGHT

LEVEL TIME LEVEL TIME

0.5lb 70% 45sec. 40% 15sec.

(5) If improper operation is indicated, the control unit is probably defective and should be checked.

MO30 STA NE

PROCEDURE LETTER

TEST PROCEDURES

COMPONENT TEST

M AH SENSOR TEST

Checking the initial sensor cooking condition Warning: The oven should be fully assembled before following procedure.

1) The oven should be plugged in at least two minutes before sensor cooking.

2) Room temperature should not exceed 95

F(35oC).

3) The unit should not be installed in any area where heat and steam are generated. The unit should not be installed for example, next to conventional surface unit. Refer to the "INSTALLATION INSTRUCTIONS" of the operational manual.

(4) Exhaust vents are provided on the back of the unit for proper cooling and air ﬂow in the cavity. To

permit adequate ventilation, be sure to install so as not to block these vents. There should be some space for air circulation.

(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any

moisture with dry cloth or paper towel.

(6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be

at refrigerator temperature and canned soup at room temperature.

(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The

sensor will detect the vapor given of by the spray and turn off before food is properly cooked.

(8) If the sensor has not detected the vapor of the food, ERROR will apear and the oven will shut off.

Water load cooking test Warning: The oven should be fully assembled before following procedure.

Make sure the oven the oven has been plugged in at least two minutes before checking sensor cook operation . the cabinet 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 the 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 "1" pad once. Now, the oven is in the sensor cooking condition and "TEST", "SENSOR" and "COOK" will appear in the display. (6) The oven will operate for the ﬁrst 16 seconds, without generating microwave energy. NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during the ﬁrst stage of sensor cooking. (7) After approximately 16 seconds, microwave energy is produced. If ERROR is displayed, replace the AH sensor or check the control unit, refer to explaination below. If the oven stops after 5 minutes and ERROR is displayed, check the parts except for the AH sensor.

TESTING METHOD FOR AH 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. (2) Open the door and block it open. (3) Discharge high voltage capacitor. (4)Remove the AH sensor. (5)Install the new AH sensor. (6)Reconnect all leads removed from components during testing. (7)Re-install the outer case (cabinet) (8) Reconnect the power supply cord after the outer case is installed. (9)Reconnect the oven to the power supply and check the sensor cook operation as follows: 9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup. 9-2. Place the container on the center of tray in the oven cavity. 9-3. Close the door. 9-4. Touch the Timer/Clock pad once, the Power Level pad twice, the Start pad once and the number "1" pad once. 9-5. Now, the oven is in the sensor cooking condition and "TEST", "SENSOR" and "COOK" will

appear in the display.

9-6. The display will start to count down the remaining cooking time, and the oven will turn off

automatically after the water is boiling (bubbling).

If new sensor does not operate properly, the problem is with the control unit, and refer to explanation below.

PROCEDURE LETTER

MO30 STA NE

TEST PROCEDURES

COMPONENT TEST

CHECKING CONTROL UNIT

(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 sensor connector that is mounted to control panel. (5) Then connect the dummy resistor circuit (see ﬁg.) to the sensor connector of control panel. (6) Disconnect the leads to the primary of power transformer. (7) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape. (8) After that procedure, re-connect the power supply cord. (9) Check the sensor cook operation proceed as follows: 9-1 Touch Timer/Clock pad once, the Power Level pad twice, the Start pad once and the number "1" pad once. 9-2 The control panel is in the sensor cooking operation. 9-3 After approximately 25 seconds, push plunger of select switch for more than 3 seconds. This condition is same as judgement by AH sensor. 9-4 After approximately 3 seconds, the display shows "xx.xx" which is remaining cooking time, and the display count down. If the above is not the case, the control unit is probably defective. If the above is proper, the AH sensor is probably defective. (10)Disconnect the power supply cord, and then remove outer case. (11)Open the door and block it open. (12)Discharge high voltage capacitor. (13)Reconnect the sensor connector that is mounted to control panel. (14)Carry out the necessary repair. (15)Reconnect all leads removed from components during testing and repairing. (16)Re-install the outer case (cabinet) (17)Reconnect the power supply cord after the outer case is installed. Run the oven and check all

functions

(18)Carry out the "water load cooking test" again and ensure that the oven work properly.

MO30 STA NE

PROCEDURE LETTER

N 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.

5. Using an ohm-meter, check between the terminals as described in the following table:

TEST PROCEDURES

COMPONENT TEST

NOISE FILTER UNIT

0.22uF/ AC 250V

NOISE SUPPRESSION COIL

LINE CROSS CAPACITOR

MONITOR FUSE

LINE BYPASS CAPACITOR

0.0033uF/ AC

120 V

LOAD

LINE BYPASS CAPACITOR

0.0033uF/ AC

120 V

LOAD

MEASURING POINT INDICATION OF OHM-METER

Between N and H Open Circuit

Between terminal N and GRY Short Circuit

Between terminal H and RED Short Circuit

If incorrect readings are obtained, replace the noise ﬁlter.

6. Reconnect all leads removed from components during testing.

7. Re-install the outer case (cabinet).

8. Reconnect the power supply cord after the outer case is installed.

9. Run the oven and check all functions.

ABSOLUTE HUMIDITY SENSOR CIRCUIT

ventilation opening for sensing

Sensing part (Open vessel)

Sensing part (Closed vessel)

Thermistors

Operational amplifier

Output voltage

S : Thermistor open vessel

C : Thermistor closed vessel

Absolute humidity (g/m )

Output voltage

Absolute humidity vs, output voltage characteristic

(1) Structure of Absolute Humidity Sensor

The absolute humidity sensor includes two thermistors

as shown in the illustration. One thermistor is housed in the closed vessel ﬁlled with dry air while another in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the external airﬂow.

(2) Operational Principle of Absolute Humidity

Sensor

The ﬁgure below shows the basic structure of an absolute

humidity sensor. A bridge circuit is formed by two thermistors and two resistors(R1 and R2). The output of the bridge circuit is to be ampliﬁed by the operational ampliﬁer.

Each thermistor is supplied with a current to keep it

heated at about 150oC (302oF), the resultant heat is dissipated in the air and if the two thermistors are placed in different degrees of heat conductivity leading to a potential difference between them causing an output voltage from the bridge circuit, the intensity of which is increased as the absolute humidity of the air inceases. Since the output is very minute, it is ampliﬁed by the operational ampliﬁer.

(3) Detector circuit of Absolute Humidity Sensor

circuit

This detector circuit is used to detect the output voltage

of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit. When the unit is set in the sensor cooking mode, 16 seconds clearing cycle occurs then the detector circuit starts to function and the LSI observes the initial voltage available at its AN1 terminal.

MO30 STA NE

With this voltage given, the switches SW1 to SW5 in

the LSI are turned on in such a way as to change the resistance values in parallel with R48 ~ R52 of IC1. Changing the resistance value results in that there is the same potential at both F-3 terminal of the absolute humidity sensor and AN6 terminal of the LSI. The voltage of AN5 terminal will indicat about 16 seconds about -

2.50 V. This initial balancing is set up about 16 seconds after the unit is put in the Sensor Cooking mode. As the sensor cooking proceeds, the food is heated to generate moisture by which the resistance balance of the bridge circuit is deviated to increase the voltage available at AN5 terminal of the LSI.

Then the LSI observes that the voltage at AN5 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 the next operation automatically. When the LSI starts to detect the initial voltage at AN5 terminal 16 seconds after the unit has been put in the Sensor Cooking mode, if it is not possible to balance of the bridge circuit due to disconnection of the absolute humidity sensor, ERROR will appear on the display and the cooking is stopped.

1) Absolute humidity sensor circuit

PA0

PA1

PA2

PA3

PA4

AN4

AN5

SW1

SW2

SW3

SW4

SW5

LSI (IC1)

C. Thermistor in closed vessel S. Thermistor in open vessel

0.1 MF

F-3

F-1

F-2

VA : -15V

3.57k

3.32k

R90

C90

1.8k

0.1

47k

620k

300k

150k

75k

37.4k

C42

8 7 6 5

1 2 3 4

IC3

D90

VA : -15V

360k

0.01uF

C91

0.015uF

10k

VC : -5V

0.01uF

C43

47k

D91

MO30 STA NE

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..

WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operat-

ing the oven.

1. Disconnect the power supply cord.

2. Make sure that a deﬁnite” click” can be heard when the microwave oven door is unlatched. (Hold the door in a closed position with one hand, then push the door open button with the other, this causes 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;

WARNING FOR WIRING

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.

3) Discharge the high voltage capacitor and wait for 60 seconds.

2. Don’t let the wire leads touch to the following parts;

1) High voltage parts:

Magnetron, High voltage transformer, High voltage

capacitor and High voltage rectiﬁer assembly.

2) Hot parts:

Oven lamp, Magnetron, High voltage transformer and

Oven cavity.

1. Door does not close ﬁrmly.

2. Door hinge, support or latch hook is damaged.

3. The door gasket or seal is damaged.

4. The door is bent or warped.

5. There are defective par ts in the door interlock system.

6. There are defective parts in the microwave generating and transmission assembly.

7. There is visible damage to the oven.

Do not operate the oven:

1. Without the RF gasket (Magnetron).

2. If the wave guide or oven cavity are not intact.

3. If the door is not closed.

4. If the outer case (cabinet) is not ﬁtted.

3) Sharp edge: Bottom plate, Oven cavity, Waveguide ﬂange,

Chassis support and other metallic plate.

4) Movable parts (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, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the following removal procedures:

OUTER CASE REMOVAL

To remove the outer case, proceed as follows.

1. Disconnect the power supply cord.

2. Open the oven door and block it open.

3. Remove the two (2) screws from the lower portion of the rear cabinet using a T20H Torx type or GTXH20-100 screw driver.

4. Remove the remaining three (3) screws from rear and four (4) screws along the right & left sides of outer case.

5. Slide the entire outer case back out about 1 inch (3 cm) to free it from retaining clips on the cavity face plate.

6. Lift entire outer case from the unit.

CAUTION: 1. DISCONNECT OVEN FROM POWER SUP

PLY BEFORE REMOVING OUTER CASE.

2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

NOTE: When replacing the outer case, the 2 special

Torx screws must be reinstalled in the same locations.

POWER TRANSFORMER REMOVAL

1. Disconnect the power supply cord and then remove outer

case.

2. Open the oven door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect wire leads (primary and high voltage) from

power transformer and the ﬁlament leads from the magnetron and capacitor terminals.

5. Remove four (4) screws holding transformer to bottom

plate.

6. Remove transformer from bottom plate.

MO30 STA NE

Special screw

Screw Driver (Type: TORX T20 H or GTXH20-100)

Re-install

1. Rest transformer on the bottom plate with its primary terminals toward the oven face plate.

Secure transformer with four screws to bottom plate.

3. Re-connect wire leads (primary and high voltage) to power transformer and ﬁlament leads of transformer to magnetron and high voltage capacitor. Refer to "PICTORIAL DIAGRAM" on page 33.

4. Re-install outer case and check that oven is operating properly.

HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL

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 high voltage wire A from the high voltage capacitor.

5. Disconnect the high voltage wire of high voltage rectiﬁer assembly from the magnetron.

6. Disconnect the ﬁlament lead (short one) of the power transformer from the high voltage capacitor.

MAGNETRON REMOVAL

Removal

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 wire leads from magnetron.

5. Remove the two (2) screws holding the chassis support to the magnetron and the oven cavity front ﬂange.

6. Slide the magnetron duct slightly so that the two (2) screws at left hand side of the magnetron appear.

7. Carefully remove the four (4) screws holding magnetron to waveguide ﬂange.

8. Remove the magnetron with care so that the magnetron antenna is not hit by any metal object around the antenna.

9. Now, the magnetron is free.

7. Remove one (1) screw holding capacitor holder with the high voltage rectiﬁer to the base plate.

8. Disconnect rectiﬁer terminal from capacitor.

High voltage rectiﬁer assembly is now free.

9. Remove capacitor holder. Capacitor is now free.

CAUTION: WHEN REPLACING HIGH VOLTAGE REC-

TIFIER AND HIGH VOLTAGE CAPACITOR, GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW.

Re-install

1. Re-install the magnetron to waveguide ﬂange with care to prevent damage to the magnetron antenna.

2. Secure the magnetron with the four (4) screws.

3. Hold the chassis support to the oven cavity front plate and the magnetron with the two (2) screws.

4. Reconnect the wire leads to the magnetron. Refer to "PICTORIAL DIAGRAM" on page 33.

5. Re-install outer case and check that the oven is operating properly.

CAUTION: WHEN REPLACING MAGNETRON, BE SURE

THE R.F. GASKET IS IN PLACE AND MOUNTING SCREWS ARE TIGHTENED SECURELY

MO30 STA NE

OVEN LAMP AND LAMP SOCKET REMOVAL

Disconnect the power supply cord and remove outer

1. case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove the wire leads from the oven lamp the terminal by pushing on the positive lock lever (Fig C-1).

5. Remove the screw holding the oven lamp, then remove lamp from the magnetron duct.

6. Now, the oven lamp is free to check or replace.

POSITIVE LOCK

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. Push the lever of positive lock

5. Pull down on the positive lock® connector.

connector.

CONNECTOR (NO-CASE TYPE) REMOVAL

Terminals

Screw

Oven lamp

Figure C-1. Oven lamp

Positive lock¨ connector

Lever

Terminal

Push

CAUTION: WHEN CONNECTING THE POSITIVE LOCK®

CONNECTORS TO THE TERMINALS, CONNECT THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU.

CONTROL PANEL ASSEMBLY REMOVAL

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 wire leads from panel components.

5. Remove the one (1) screw holding the control panel assembly to the oven cavity front plate.

6. Slide the control panel assembly upward and remove it.

7. Now, individual components can be removed.

PWB Removal:

1. Lay Control Panel on pretect surface with PWB up.

2. Remove 4 scews shown in Fig 3.

3. Lift plastic ribbon holder to release ribbon out of connector.

4. Release tabs from PSU (4) and LSI (2) and lift each off.

5. The PWB is now free to replace.

Pull down

Figure C-2. Positive lock® connector

PSU

LSI

Screw

Tab

Screw

Tab

Screw

Ribbon connector

Tab

Screw

Tab

TURNTABLE MOTOR REMOVAL

1. Disconnect the power supply cord.

2. Remove turntable and turntable support from oven cavity.

3. Lay the oven on it's backside. Remove the turntable motor cover by snipping off the material in four corners.

4. Where the corners have been snipped off bend corner areas ﬂat. No sharp edges must be evident after removal of the turntable motor cover.

5. Disconnect wire leads from turntable motor.

Figure 3. PWB Removal

(See "Positive lock connector removal")

6. Remove one (1) screw holding turntable motor to oven cavity.

7. Now the turntable motor is free.

8. After replacement use the one (1) screw to ﬁt the turntable motor cover.

COOLING FAN MOTOR REMOVAL

REMOVAL

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 wire leads from the fan motor.

5. Remove the two (2) screws holding the fan motor to the oven cavity back plate.

6. Remove the fan blade from the fan motor shaft according to the following procedure.

7. Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers.

CAUTION: * Make sure that no metal pieces enter the gap between

the rotor and the stator of the fan motor because the rotor is easily shaven by pliers and metal pieces may be produced.

* Do not touch the pliers to the coil of the fan motor

because the coil may be cut or injured.

* Do not disﬁgure the bracket by touching with the

pliers.

8. Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand.

9. Now, the fan blade and the fan motor will be free.

MO30 STA NE

CAUTION: * Do not reuse the removed fan blade because the

hole (for shaft) may be larger than normal.

INSTALLATION

1. Install the fan blade to the fan motor shaft according to the following procedure.

2. Hold the center of the bracket which supports the shaft of the fan motor on the ﬂat table.

3. Apply the screw lock tight into the hole (for shaft) of the fan blade.

4. Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet.

CAUTION: * Do not hit the fan blade strongly when installed

because the bracket may be disﬁgured.

* Make sure that the fan blade rotates smooth after

installation.

* Make sure that the axis of the shaft is not slanted.

5. Install the fan motor to the the oven cavity back plate with the two (2) screws.

6. Connect the wire leads to the fan motor, referring to the pictorial diagram.

Coil

Stator

Gap Bracket

Rotor

Groove joint pliers

Axis

Shaft

Stator

Rotor

These are the positions that should be pinched with pliers

Table

Shaft

Center of bracket

Rear View

Side View

AH SENSOR REPLACEMENT

REMOVAL

Disconnect the power supply cord and remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove the two (2) screws holding the AH sensor to the sensor duct.

5. Disconnect the AH sensor harness from the connector CN-F on control unit.

RE-INSTALL

Insert the new AH sensor into the sensor duct.

2. Install two (2) screws to secure the AH sensor.

3. Route the AH sensor harness across the oven cavity top plate and through the large opening.

4. Connect the AH sensor harness to CN-F on control unit.

5. Re-install the outer case cabinet and check for proper

DOOR SENSING SWITCH/PRIMARY SWITCH/SECONDARY SWITCH AND MONITOR SWITCH REMOVAL

Disconnect the power supply cord and remove outer

1. case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect wire leads from the switches.

Remove two (2) screws holding latch hook to oven ﬂange.

6. Remove latch hook assembly from oven ﬂange.

7. Push outward on the two (2) retaining tabs holding switch in place.

8. Switch is now free. At this time switch lever will be free, do not lose it.

Re-install

1. Re-install each switch in its place. The secondary interlock/monitor switches are in the lower position and the door sensing switch is in the upper position.

2. Re-connect wire leads to each switch.

Refer to pictorial diagram.

MO30 STA NE

3. Secure latch hook (with two (2) mounting screws) to oven ﬂange.

and check continuity of the monitor circuit. Refer to chapter

"Test Procedure" and Adjustment procedure.

4. Make sure that the monitor switch is operating properly

DOOR SENSING SWITCH/PRIMARY SWITCH/SECONDARY SWITCH AND MONITOR SWITCH ADJUSTMENT

1. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

If the door sensing switch, primary switch, secondary switch and monitor switch do not operate properly due to a misadjustment, the following adjustment should be made.

4. Loosen the two (2) screws holding latch hook to the oven cavity front ﬂange.

5. With door closed, adjust latch hook by moving it back and

forth, and up and down. In and out play of the door

allowed by the upper and lower position of the latch hook should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the door sensing switch, primary switch and secondary switch are activated with the door closed. The horizontal position of the latch hook should be adjusted so that the plunger of the monitor switch is pressed with the door closed.

6. Secure the screws with washers ﬁrmly.

7. Check the operation of all switches. If each switch has not activated with the door closed, loosen screw and adjust the latch hook position.

After adjustment, check the following.

1. In and out play of door remains less than 0.5mm when in the latched position. First check upper position of latch hook, pushing and pulling upper portion of door toward the oven face. Then check lower portion of the latch

hook, pushing and pulling upper portion of door toward

the oven face. Both results (play in the door) should be less than 0.5mm.

2. The door sensing switch, primary switch and secondary switch interrupt the circuit before the door can be opened.

3. Monitor switch contacts close when door is opened.

4. Re-install outer case and check for microwave leakage around door with an approved microwave survey meter.

Latch Heads

Door

Switch Lever

Door Sensing Switch

Monitor Switch

Secondary Switch

Primary Switch

Figure C-3. Latch Switch Adjustments

DOOR REPLACEMENT

REMOVAL

1. Disconnect the power supply cord.

2. Push the open button and open the door.

3. Remove door stopper, then release two (2) pins of door panel from two (2) holes of upper and lower oven hinges by lifting up.

4. Insert a putty knife (thickness of about 0.5mm) into the gap between the choke cover and door frame as shown in Figure C-4 to free engaging parts.

5. Pry the choke cover by inserting a putty knife as shown Figure C-4.

6. Release choke cover from door panel.

7. Now choke cover is free.

Choke Cover

Door Frame

Putty Knife

Figure C-4. Door Disassembly

8. Release the door panel from twelve (12) tabs of door frame.

9. Remove the door panel from the door frame.

10. Now, door panel is free.

11. Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head.

12. Now, latch head and latch spring are free.

13. Remove door screen from door frame

14. Now, door frame is free.

RE-INSTALL

1. Re-install door screen to door frame.

2. Re-install the latch spring to the latch head. Re-install the latch spring to the door frame. Re-install latch head to door frame.

3. Re-install door panel to door frame by ﬁtting twelve (12) tabs of door frame to twelve (12) holes of door panel.

4. Put sealer ﬁlm on door panel. Refer to “Sealer Film” about how to handle new one.

5. Catch two (2) pins of door panel on two (2) hole of upper and lower oven hinges and door stopper.

MO30 STA NE

6. Re-install choke cover to door panel by pushing.

Note: After any service to the door;

(A) Make sure that door sensing switch and secondary

interlock 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 standards.

After any service, make sure of the following :

1. Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole.

2. Deviation of door alignment from horizontal line of cavity face plate is to be less than 1.0mm.

3. Door is positioned with its face pressed toward cavity face plate.

4. Check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

Note: The door on a microwave oven is designed to act

as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle. This function does not require that door be air-tight, moisture (condensation)-tight or light-tight. Therefore, occasional appearance of moisture, light or sensing of gentle warm air movement around oven door is not abnormal and do not of themselves indicate a leakage of microwave energy from oven cavity.

SEALER FILM

Installation

1. Put the adhesive tape on the backing ﬁlm of the sealer ﬁlm as shown in Fig. C-6.

2. Tear the backing ﬁlm by pulling the adhesive tape.

3. Put the pasted side of the sealer ﬁlm on the door panel

Figure C-5. Door Replacement

MO30 STA NE

4 5

PNK

GRN

N.O.

HIGH

VOLTAGE

CAPACITOR

H.V. RECTIFIER

POWER

YLW

GRY

TRANSFORMER

WHT

BRN

ORG

BLK

WHT

FAN MOTOR

HIGH VOLTAGE

WIRE A

HIGH VOLTAGE COMPONENTS

MAGNETRON

COM.

DOOR

SENSING

SWITCH

GRN

The screw must always be

kept tight.

GRN

to Oven cavity

POWER SUPPLY

CORD 120V 60Hz

GRN 2

NOTE:

The neutral (WHT/GRY) wire must

be connected to the terminal with

PNK 1

"N" mar k on the power s upply

CN-B

cord.

TURNTABLE

MOTOR

WHT

RED

NOTE:

The grounding conductor of

the power supply cord has

been gr ounded by pow er

supply cord fixing screw.

BLK

WHT

CAVITY TEMP. FUSE

BLK

TO CN-A

on POWER UNIT

RED

N.C.

GRY

COM.

SWITCH MONITOR

YLW

COM.

SECONDARY

SWITCH

BLK

BRN

BLK

ORG

PRIMARY

SWITCH

COM.

ORG

RED

Figure S-1. Pictorial Diagram

OVEN LAMP

RELAY

INTERLOCK

PRIMARY

BLUE

ORG

WHT

CN-B

RY2

COM

(POWER UNIT)

RY1

CN-A

COM.

N.O.

BLK

AH SENSOR

BLK

CN-F

RED

WHT

BLK

WHT

RED

MAGNETRON TEMP. FUSE

GRY

RED RED

IC1

CONTROL UNIT

CN-F

(LSI UNIT)

4 5

GRY

PARTS LIST

Note: The parts marked “∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V.

REF. NO. PART NO. DESCRIPTION QTY

MO30 STA NE

1- 1 FC-QZA630WRKZ High voltage assembly 1

1- 2 FDTCTA198WRK0 AH sensor 1 1- 3 RLMPTA096WRZZ Oven lamp 1 1- 4 FPWBFA292WRE0 Noise lter 1 1- 5 RMOTEA433WRZZ Fan motor 1 1- 6 FFS-BA016/KIT 1- 7 QSW-MA085WRE0 1- 8 QFS-TA013WRE0 Magnetron temperature fuse 15 1- 9 QFS-TA014WRE0 Cavity temperature fuse 150½C 1

∆

1-10 RV-MZA368WRZZ Magnetron 1 1-11 RMOTDA252WRZZ Turntable motor 1 1-12 RTRN-B094MRE0 Power transformer 1

1-13 FACCDB023MRE0 Power supply cord 1

Monitor switch (V-16G-2C25) and fuse assembly (20A 250V AC)

Secondary interlock switch and door sensing switch (V-5230Q)

ELECTRIC PARTS

oC 1

CABINET PARTS

2- 1 GDAI-A439WRWZ Base plate 1 2- 2 GLEGPA104WREZ Foot 4 2- 3 GCABUB202WRPZ Outer case cabinet 1

CONTROL PANEL PARTS

3- 1 CPWBFB138MRU0 CPU unit 1 3- 2 DPNLCB195MRK0 Control panel frame assy 1 3- 3 JBTN-B445WRFZ Open button assy 1 3- 4 MSPRCA157WREZ Open button spring 1 3- 5 XEPS730P08XS0 Screw; 3mm x 8mm 4

OVEN PARTS

4- 1 LBNDKA163WRPZ H.V. Capacitor band 1 4- 2 LANGTA430WRPZ Chassis support 1 4- 3 PHOK-A130WRFZ Latch hook 1 4- 4 MLEVPB016MRF0A Switch lever 1 4- 5 PDUC-B033WRFZ Magnetron duct 1 4- 6 NFANJA060WRFZ Fan blade 1 4- 7 PDUC-A610WRF0 Fan duct 1 4- 8 ------------- Oven cavity (Not a replaceable part) 1 -- 4- 9 PCOVPA465WREZ Waveguide cover 1 4-10 PPACGA084WRF0 Turntable motor packing 1 4-11 PDUC-B031WRPZ Sensor duct 1 4-12 PCUSGA630WRPZ Baseplate cushion 1 4-13 PCUSGA731WRPZ Mag cushion 1 4-14 PCUSGA730WRPZ Fan motor cushion 1 4-15 PCUSGA729WRPZ C/P cavity cushion 1 4-16 PCUSUA278WRP0 Fan duct cushion 1

MO30 STA NE

REF. NO. PART NO. DESCRIPTION Q'TY

5 -1 CDORFB567MRK0 Door assembly 1 5 -2 LSTPPB021MRF0 Latch head 1 AE 5 -3 MSPRTA046WRE0 Latch spring 1 AB 5- 4 GCOVHB047MRF0 Choke cover 1 5- 5 LSTPPB045MRF0 Door stopper 1

MISCELLANEOUS

DOOR PARTS

6- 1 TCADUB018MRR0 Recipe card 1 AF 6- 2 FW-VZC288WREZ Main wire harness 1 AU 6- 3 FROLPA117WRKZ Turntable support 1 AN 6- 4 NTNT-A099WRE0 Turntable tray 1 AT 6- 5 TCAUAA292WRRZ Monitor caution label 1 AA 6- 6 TCAUAB033MRR0 DHHS/Screw caution label 1 AB 6- 7 TINSLB019MRR0 Operation manual 1 AF 6- 8 QW-QZB016MRE0 High voltage wire A 1 AD 6 -9 TCAUAB048MRR0 DHHS/GRD/BIK caution 1 AB 6-10 TCAUAB075MRR0 Health Canada label 1 AB 6-11 TCAUHB008MRR0 User caution label 1 6-12 TLAB-B191WRRZ Menu label 1

SCREWS,NUTS AND WASHERS

7- 1 XHPS740P08000 Special screw 5 AA 7- 2 LX-CZ0052WRE0 Special screw 3 AA 7- 3 XHTS740P12RV0 Screw : 4mm x 12mm 1 AA 7- 4 XCBS730P08000 Screw 1 AA 7- 5 XOTS740P12000 Screw : 4mm x 12mm 24 AA 7- 6 XCBS730P08000 Screw : 3mm x 8mm 2 AA 7- 7 LX-CZA070WRE0 Special screw 2 AA 7- 8 XHTS740P08RV0 Screw : 4mm x 8mm 2 AA 7- 9 XOTS840P08000 Screw : 4mm x 12mm 4 AA

MO30 STA NE

OVEN AND CABINET PARTS

1-2

7-6

4-11

4-8

7-2

7-6

7-9

1-9

2-3

6-9

4-15

4-6

1-5

6-6

4-7

4 5

7-5

4-16

6-10

7-3

1-13

7-8

7-6

7-5

1-8

7-9

7-7

7-5

1-6

1-4

4-2

4-14

4-9

6-5

7-2

6-4

6-12

4-10

1-11

7-4

1-12

6-3

2-1

7-5

7-2

1-7

4-3

7-1

1-7

1-6

1-7

4-4

4-1

7-1

1-10

7-4

4-13

1-3

4-5

1-1

7-5

4-12

2-2

7-5

4 5

MO30 STA NE

CONTROL PANEL PARTS

6-11

3-3

3-2

4 5

3-1

3-5

3-4

DOOR PARTS

5-1

5-3

5-2

5-4

5-5

MISCELLANEOUS

6-2

6-8

Actual wire harness may be different from illustration.

4 5

PACKING AND ACCESSORIES

Non-replaceable items.

DOOR PROTECTION SHEET

6-4 TURNTABLE TRAY

OF T

OVEN

MO30 STA NE

TOP PAD ASSEMBLY

PLASTIC BAG

6-1 RECIPE CARD

TRAY HOLDER

6-7 OPERATION MANUAL

6-3 TURNTABLE SUPPORT

PACKING CASE

THE O

BOTTOM PAD ASSEMBLY

MO30 STA NE

NOTES

MO30 STA NE

No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

Bertazzoni MO30STANE User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual