Frigidaire LCRT2010ST User Manual
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MICROWAVE OVEN

SERVICE MANUAL

MODEL: LCRT2010ST

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

 

November, 2010

P/NO : MFL06272518

Printed in Korea

 

 

 

 

SAFETY PRECAUTIONS

This device is to be serviced only by properly qualified service personnel.

Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy.

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 performed on each oven prior to release to the owner.

CAUTION

MICROWAVE RADIATION

DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

CONTENTS

(Page)

SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2-1INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-1OPERATING INSTRUCTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-1

FEATURES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1CONTROL PANEL - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-1OPERATING SEQUENCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-2SCHEMATIC DIAGRAM - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-3CIRCUIT DESCRIPTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-4

SERVICE INFORMATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1

TOOLS AND MEASURING INSTRUMENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1MICROWAVE LEAKAGE TEST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -5-1MEASUREMENT OF MICROWAVE POWER OUTPUT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -5-3DISASSEMBLY AND ADJUSTMENT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -5-3INTERLOCK CONTINUITY TEST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -5-7COMPONENT TEST PROCEDURE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -5-8TROUBLE SHOOTING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -5-11

EXPLODED VIEW - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-1REPLACEMENT PARTS LIST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -7-1

 

 

 

SPECIFICATIONS

 

 

 

 

 

 

 

 

 

ITEM

 

 

 

 

 

DESCRIPTION

 

 

 

 

 

 

 

 

 

Model

LCRT2010ST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power Requirement

120 V~ 60 Hz

 

 

 

 

 

 

 

1650 watt (14.0 A)

 

 

 

 

 

 

Single phase, 3 wire grounded

 

 

 

 

 

 

 

 

Power Output

1200 watt full microwave power (IEC60705)

 

 

 

 

 

 

 

 

 

 

Microwave Frequency

2450 MHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Magnetron

2M246 - 050GF

 

 

 

 

 

 

 

 

 

 

 

 

 

Timer

0 ~ 9 min. 99 sec.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outside Dimensions

23

7/

” (W) x 13

9/ ” (H) x 1913/

16

” (D)

 

 

 

 

8

 

16

 

 

 

 

Cavity Dimensions

16

11/ ” (W) x 111/

” (H) x 18 1/

16

” (D)

 

 

 

 

 

16

4

 

 

 

 

Net Weight

18Kg

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Shipping weight

20Kg

 

 

 

 

 

 

 

 

 

 

 

 

 

Control Complement

Touch Control System

 

 

 

 

 

Clock : 1:00 - 12:59

 

 

 

 

 

Microwave Power for Variable Cooking

 

 

 

Power level

 

 

 

 

 

 

 

HIGH ---------------------------

 

Full power throughout the cooking time

 

9

(Saute)---------

approx. 90% of Full power,

8 (Reheat)-------------

approx. 80%

 

7 (Med.-High)---------------------

 

approx. 70%, 6 (Medium)------------

approx. 60%

 

5

(Med.-Low)---------------------

 

approx. 50%,

4 (Defrost)-------------

approx. 40%

 

3 (Low)-----------------------------

 

approx. 30%,

2 (Simmer)------------

approx. 20%

 

1 (Warm)---------------------------

 

approx. 10%

 

 

 

 

 

 

 

 

 

 

 

 

Rating Label Location

 

 

 

 

 

 

 

 

 

Back side

Accessories

Owner's manual & cooking guide

Glass turntable

Roller rest

This microwave oven is designed for household use only.

It is not recommended for commercial purposes.

1-1

CAUTIONS

Unlike other appliances, the microwave oven is high-voltageandhigh-currentequipment. Though it is free from danger in ordinary use, extreme care should be taken during repair.

DO NOT operate on a 2-wireextension cord during repair and use.

NEVER TOUCH any oven components or wiring during operation.

BEFORE TOUCHING any parts of the oven, always remove the power plug from the outlet.

For about 30 seconds after the oven stop, an electric charge remains in the high voltage capacitor. When replacing or checking, you must discharge the high voltage capacitor by shorting across the two terminals with an insulated screwdriver.

Remove your watches whenever working close to or replacing the Magnetron.

DO NOT touch any parts of the control panel circuit. A resulting static electric discharge may damage this P.C.B.

NEVER operate the oven with no load.

NEVER injure the door seal and front plate of the oven cavity.

NEVER put iron tools on the magnetron.

NEVER put anything into the latch hole and the interlock switches area.

MICROWAVE RADIATION

Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating device if it is improperly used or connection. All input and output microwave connections, waveguide, flange and gasket must be secure never operate the device without a microwave energy absorbing load attached.

Never look into an open waveguide or antenna while the device is energized.

Proper operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity. Never operate the magnetron unless it is properly installed.

Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron.

ANTENNA

Gasket

COOLING FIN

FILAMENT

TERMINALS

MAGNETRON

CHASSIS GROUND

MAGNETRON

THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL.

2-1

INSTALLATIONS

BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.

INSTALLING

1.Empty the microwave oven and clean inside it with a soft, damp cloth. Check for damage such as misaligned door, damage around the door or dents inside the cavity or on the exterior.

2.Put the oven on a counter, table, or shelf that is strong enough to hold the oven and the food and utensils you put in it. (The control panel side of the oven is the heavy side. Use care when handling.)

3.Do not block the vent and the air intake openings. Blocking vent or air intake openings can cause damage to the oven and poor cooking results. Make sure the microwave oven legs are in place to ensure proper air flow.

4.The oven should not be installed in any area where heat and steam are generated, because they may damage the electronic or mechanical parts of the unit.

Do not install the oven next to a conventional surface unit or above a conventional wall oven.

5.Use microwave oven in an ambient temperature less than 104°F(40°C).

6.Place the microwave oven on a sturdy and flat surface at least 10 cm(4 inches) from the wall.

7.Place the microwave oven as far away as possible from TV, RADIO, COMPUTER, etc., to prevent interference.

GROUNDING INSTRUCTIONS

For personal safety,this appliance must be fully grounded at all times.

In the event of an electrical short circuit, grounding reduces the risk of electrical shock.

The plug must be plugged into an outlet that is properly installed and grounded.

WARNING

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

Do not, under any circumstances, cut or remove the third ground prong from the power cord plug.

PREFERRED METHOD

INSURE PROPER GROUND

EXISTS BEFORE USE

TEMPORARY METHOD (ADAPTER PLUGS NOT

PERMITTED IN CANADA)

ALIGN LARGE

PRONGS/SLOTS

ENSURE PROPER GROUND

AND FIRM CONNECTION

BEFORE USE

3-1

OPERATING INSTRUCTIONS

FEATURES

Roller rest

CONTROL PANEL

1

 

2

 

3

5

4

6

7

9

8

10

11

 

12

13

14

15

16

 

17

18

 

19

1.DISPLAY : The display includes a clock and indicators that tell you time of day, cooking time settings, and cooking functions selected.

2.SENSOR TOUCH : This pad allows you to cook most of your favorite foods without having to select cooking times and power levels.

3.AUTO COOK : Touch this pad to select programming food items.

4.CUSTOMSET: Touch this pad to select sound(on/off), clock(on/off), scroll speed(slow,normal, fast) and unit(lbs./kg.).

5.LESS : Each time you touch this pad, you subtract 10 seconds from the cooking time.

6.MORE : Each time you touch this pad, you add 10 seconds to the cooking time.

7.EXPRESS DEFROST : Touch this pad to thaw only 1lb of food very quickly.

8.AUTO DEFROST : Thispadis anaccurate defrosting method for meat,poultryandfishupto6.0lbsor 4.0 kgs.

9.SOFTEN : Touch this pad to soften butter,ice cream, cream cheese, or frozen juice.

10.MELT : TTouch this pads to melt butter,margarine, chocolate,cheese,or mashmallows.

11.NUMBER PADS : Touch number pads to enter cooking time, power level, quantities, or weights.

12.TIME COOK : Touch this pad to set a cooking time.

13.POWER LEVEL : Touch this pad to set a cooking power.

14.KITCHEN TIMER : Touch this pad to use your microwave oven as a kitchen timer.

15.EZ-ON : Touch this pad to cook at 100% cook power for 30 seconds up to 3 minutes 30 seconds; after 3 minutes 30 seconds, every touch will add 1 minute up to 99 min 59 seconds.

16.TrueCookPlus : Touch this pad to cook food accord ing to TrueCookPlus code.

17.START/ENTE R : This feature allows oven to begin functioning.

18.STOP/CLEAR : Touch this pad to stop the oven or clear entries.

19.CLOCK : Touch this pad to enter the time of day.

4-1

OPERATING SEQUENCE

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

1. SETTING THE CLOCK

STOP/

 

 

CLOCK

 

 

Set the

 

 

START

CLEAR

 

 

 

 

correct hour

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Set the

 

 

START

 

 

 

 

 

 

correct minute

 

 

 

 

 

 

 

 

 

 

 

NOTE: This is a 12 hour clock. You can switch between AM and PM by touching 1 or 2 after step 4.

8. CHILD LOCK

This oven has a CHILD LOCK feature TO SET CHILD LOCK

• Touch STOP/CLEAR pad

Touch and hold START/ENTER pad LOCKED appears on the display.

TO CANCEL CHILD LOCK

Touch and hold START/ENTER pad LOCKED disappears.

2. CANCEL FUNCTION

Touch the STOP/CLEAR pad whenever you need to

cancel an entry or a function currently in use.

The display will return either to the last item entered

or to the clock.

3. Ez-On

STOP/CLEAR

 

 

Ez On

 

 

 

 

 

4. SENSOR TOUCH

STOP/CLEAR POPCORN

NOTE: • Heat only 1 package at a time

• Then the oven will start automatically.

9. MORE /LESS

The cook time is adjustable by MORE pad or LESS pad

STOP/CLEAR NUMBERSTART/ENTERMORE STOP/CLEARNUMBERSTART/ENTERLESS

10. QUICK DEFROST

STOP/CLEAR QUICK-DEFROST

11. KITCHEN TIMER

KITCHEN NUMBERSTART

TIMER

12. MELT

STOP/CLEAR

 

 

MELT

 

 

NUMBER OF TABLE

 

 

 

 

 

 

 

 

 

NOTE:Then the oven will start automatically.

5. TIME COOKING

TIME

 

 

NUMBER

 

 

POWER

 

 

NUMBER

 

 

START

COOK

 

 

 

 

LEVEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6. MULTI-STAGECOOKING

You can program your oven to switch from one power level to another for up to 3 stages.

To set a 2-stagecook cycle.

TIME

 

 

 

 

 

 

 

 

 

 

POWER

 

 

 

 

 

 

 

 

 

TIME

 

 

 

 

NUMBER

 

 

 

 

 

NUMBER

 

 

COOK

 

 

 

 

LEVEL

 

 

 

 

 

COOK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NUMBER

 

 

 

POWER

 

 

 

 

NUMBER

 

 

 

START

 

 

 

 

 

 

 

LEVEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13. SOFTEN

STOP/CLEAR

 

 

SOFTEN

 

 

NUMBER OF TABLE

 

 

 

 

 

 

 

 

 

NOTE:Then the oven will start automatically.

14. CUSTOM SET

CUSTOM

STOP/CLEAR NUMBER OF TABLE SET

15. EXPRESS DEFROST

STOP/CLEAR EXPRESS DEFROST

7. AUTO DEFROST COOKING

 

 

 

 

16. AUTO COOK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AUTO

 

 

NUMBER

 

 

NUMBER OF

 

 

START

 

AUTO COOK

 

 

NUMBER OF TABLE

 

 

 

 

 

 

 

DEFROST

 

 

 

 

WEIGHT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4-2

SCHEMATIC DIAGRAM

4-3

CIRCUIT DESCRIPTION

GENERAL DETAILS

The low voltage transformer supplies the necessary voltage to the micom controller when power cord is plugged in.

When the door is closed, the primary switch is ON, the secondary switch is ON, and the monitor switch opens (contact COM and NO).

A high voltage of approximately 2100 volts AC is generated in the secondary of the high voltage transformer which is increased by the action of the high voltage diode and charging of the high voltage capacitor.

The negative 4,000 Volts DC is applied to the filament of the magnetron.

WHEN SELECTING COOKING POWER LEVEL AND TIME

The micom controller memorizes the function you set.

The time you set appears in the display window.

Each indicator light turns on to indicate that the stage has been set.

WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUM.

The micom controller controls the ON-OFFtime of relay 2 by the applied signal to vary the average output power of microwave oven as POWER LEVEL.

(refer to page 1-1)

One complete cycle of relay 2 is 22 seconds.

WHEN TOUCHING THE START PAD

The coil of the relay is energized by the micom controller.

Power input is supplied to the high voltage transformer through the fuse to the primary switch and relay 2.

Turntable rotates.

PRIMARY

FUSE SWITCH

L

 

 

 

 

H.V.

 

MONITOR

TRANS-

 

FORMER

N

SWITCH

 

RELAY 2

 

SECONDARY

 

SWITCH

MICOM CONTROLLER

The fan motor rotates and cools the magnetron by blowing the air (coming from the intake on the baseplate).

The air is also directed into the oven to exhaust the vapor in the oven through the upper plate.

Cooking time starts counting down.

3.3 volts AC is generated from the filament winding of the high voltage transformer. This 3.2 volts is applied to the magnetron to heat the magnetron filament through two noise-preventingchoke coils.

WHEN THE DOOR IS OPENED DURING COOKING

Both the primary switch and relay 2 are cut off primary winding voltage of the high voltage transformer.

ON-OFFof relay 2 is coupled electrically with opening and closing of the secondary switch.

When the door is opened, the secondary switch is opened and when the door is closed, the secondary switch is closed.

The cooking time stops counting down.

Relay stops functioning.

As the door is opened, if the contact of primary switch and relay 2 and/or secondary switch fails to open, the fuse opens due to the large current surge caused by the monitor switch activation, which in turn stops magnetron oscillation.

PRIMARY

FUSE SWITCH

L

MONITOR

H.V.

SWITCH

TRANS-

 

FORMER

N

RELAY 2

SECONDARY

SWITCH

 

MICOM CONTROLLER

4-4

SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS

NECESSARY TOOLS

Tools normally used for TV servicing are sufficient.

Standard tools are listed below.

Diagonal pliers

Long nose pliers

Phillips screwdriver

Flat blade screwdriver

Wrench (size 5mm)

Nutdriver (size 5mm)

Adjustable wrench

Soldering iron

Solder

Vinyl insulation tape

Polishing cloth

NECESSARY MEASURING INSTRUMENTS

TESTER (VOLTS-DC,AC, Ohmmeter)

Microwave survey meter

-Holaday HI-1500

HI-1501- Narda 8100

8200

Inch scale

600 cc non conductive material beaker (glass or plastic), inside diameter: approx. 8.5 cm (31/2 in.)

Cylindrical and made of borosilicate glass vessel. max. thickness: 3 mm

outside diameter: approx. 190mm height: approx. 90mm

Glass thermometer: 100°C or 212°F (1 deg scale)

MICROWAVE LEAKAGE TEST

CAUTIONS

Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing.

The service personnel should inform the manufacture, importer, or assembler of any certified oven unit found to have a microwave emission

level in excess of 5 mW/cm2 and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage. The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance.

If the oven operates with the door open, the service personnel should:

-Tell the user not to operate the oven.

-Contact the manufacturer.

The service personnel should check all surface and vent openings for microwave leakage.

Check for microwave leakage after every servicing. The power density of the microwave radiation leakage emitted by the microwave oven should not exceed

4 mW/cm2. Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage.

MEASURING MICROWAVE ENERGY LEAKAGE

Pour 275±15cc of 20±5°C(68±9°F) water in a beaker which is graduated to 600 cc, and place the beaker on the center of the turntable.

Set the energy leakage monitor to 2,450 MHz and use it following the manufacturer's recommended test procedure to assure correct result.

When measuring the leakage, always use the 2- inch (5 cm) spacer supplied with the probe.

Operate the oven at its maximum output.

Measure the microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured

Move probe along shaded area

Probe scanning speed Less than 2.5 cm/sec (1 in/sec)

5-1

MEASUREMENT WITH OUTER CASE REMOVED

When you replace the magnetron, measure for microwave energy leakage before the outer case is installed and after all necessary components are replaced or adjusted.

Special care should be taken in measuring the following parts. (Circled area of Fig. below)

-Around the magnetron

-The waveguide

WARNING : AVOID CONTACTING ANY HIGH VOLTAGE PARTS

MEASUREMENT WITH A FULLY ASSEMBLED OVEN

After all components, including the outer case, are fully assembled, measure for microwave energy leakage around the door viewing window, the exhaust opening, and air inlet openings.

Microwave energy leakage must not exceed the values prescribed below.

NOTE : Leakage with the outer case removedless than 5 mW/cm.sq. Leakage for a fully assembled oven (Before the latch switch (primary) is interrupted) with the door in a slightly openedposition-lessthan 2 mW/cm.sq.

NOTES WHEN MEASURING

Do not exceed meter full scale deflection.

The test probe must be removed no faster than 1 inch/sec (2.5 cm/sec) along the shaded area, otherwise a false reading may result.

The test probe must be held with the grip portion of the handle.

A false reading may result if the operator's hand is befween the handle and the probe.

When testing near a corner of the door, keep the probe perpendicular to the surface making sure the probe horizontally along the oven surface.Hold vertically when testing the top and bottom,and horizontally along.

RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT

After adjustment and repair of any microwave energy interruption or microwave energy blocking device, record the measured values for future reference. Also enter the information on the service invoice.

The microwave energy leakage should not be more than 4 mW/cm.sq. after determining that all parts are in good condition, functioning properly and genuine replacement parts which are listed in this manual have been used.

At least once a year, have the electromagnetic energy leakage monitor checked for calibration by its manufacturer.

SPECIAL TIP

• This oven used the button head screws.

Button Head (Torx style 2)

• When you remove the screws, use

the tamper-resistantTorx driver having apin-in-head.

5-2

MEASUREMENT OF MICROWAVE POWER OUTPUT

Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of (1000±5) g of potable water.

The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190mm.

The oven and the empty vessel are at ambient temperature prior to the start of the test.

The initial temperature (T1) of the water is (10±2)°C. It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the turntable which is in thd lowest position and the microwave power switched on.

The time T for the temperature of the water to rise by a value T of (10±2)°K is measured, where T is the time in seconds andT is the temperature rise. The initial and final water temperatures are selected so that the maximum difference between the final water temperature and the ambient temperature is 5°K.

The microwave power output P in watts is calculated from the following formula :

4187 x (T) + 0.55 X (T2 - T0 ) X M

P =

T

T2: Temperature after heating

T0: Temperature of bowl

M: Weight of bowl

is measured while the microwave generator is operating at full power. Magnetron filament heat-uptime is not included. (about 3 sec)

The water is stirred to equalize temperature throughout the vessel, prior to measuring the final water temperature.

Stirring devices and measuring instruments are selected in order to minimize addition or removal of heat.

WATER LOAD

TURNTABLE

DISASSEMBLY AND ADJUSTMENT

A. OUTER CASE REMOVAL

1)Disconnect the power supply cord from the outlet.

2)Remove the screws from the rear of the case.

The outer case must be moved backward to be lifted off.

B. POWER SUPPLY CORD

1)Remove the outer case.

2)Disconnect two terminals and remove one screw of the ground terminal.

C.CONTROL PANEL ASSEMBLY

1)Open the door.

2)Disconnect the lead wire from RELAY (RY2) of the PCB SUB ASSEMBLY.

3)Disconnect the leadwire from connector (CN1) of the PCB SUB ASSEMBLY.

4)Remove screw which hold the controller assembly to the cavity.

5)Lift up and pull out control panel assembly carefully from the cavity.

CAUTION: DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING

(refer to page 2-1)

Remove the screw

ground

screw

securing

screw

Lift up and pull out control panel

5-3

D. PCB ASSEMBLY REMOVAL

1)Remove the control panel assembly from the cavity. (Refer to control panel assembly removal on previous page.)

2)Remove screws which hold the PCB SUB ASS’Y to the control panel.

3)Disconnect the flat cable from the PCB SUB ASS’Y and take off the PCB SUB ASS’Y

E. DOOR MAIN ASSEMBLY / REMOVAL

1)Open the door.

2)Remove the choke cover very carefully with a flat-bladescrewdriver.

CAUTION: Be careful not to damage door seal plate by screwdriver.

3) Lift up and push the door.

NOTE:

1.After replacing the door, be sure to check that the primary switch, monitor switch, and secondary switch operate normally.

2.After replacing the door, check for microwave energy leakage with a survey meter. Microwave energy must be below the limit of 4 mW/cm2. (with a 275 ml water load)

3.When mounting the door assembly to the oven assembly, be sure to adjust the door assembly parallel to the chassis. Also adjust so the door has no play between the inner door surface and oven frame assembly. If the door assembly is not mounted properly, microwaves may leak from the clearance between the door and the oven.

Remove choke cover

Remove door Assembly

Spacer

5-4

F. AIR DUCT ASSEMBLY / REMOVAL

1)Disconnect the leadwire from lamp.

2)Remove the mounting screw to the magnetron.

G. MAGNETRON REMOVAL

1)Disconnect the leadwire from themagnetron.

2)Carefully remove the mounting screws holding the magnetron to the waveguide.

3)Remove the magnetron ASS’Y until the tube is clear from the waveguide.

NOTE:

1.When removing the magnetron, make sure its dome does not hit any adjacent parts, or it may be damaged.

2.When replacing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition.

3.After replacing the magnetron, check for microwave leakage with a survey meter around the magnetron. Microwave energy must be below the limit of 5 mW/cm2. (With a 275 ml. water load).

Make sure that gasket is rigidly attached to the magnetron. To prevent microwave leakage, tighten the mounting screws properly, making sure there is no gap between the waveguide and the magnetron.

Alr duct

Magnetron

Waveguide

Dome

Waveguide

Bracket

Magnetron

Gasket

Magnetron

G. REMOVING SENSOR

1)Disconnect the leadwire from PCB Assembly.

2)Remove a screw securing the sensor duct.

5-5

H. REMOVING THE TURNTABLE MOTOR

1)Remove the turntable and rotating ring.

2)Lay the unit down on its back.

3)Remove the turntable motor cover.

The turntable base cover is easily removed by pinching the eight parts with a wire cutting.

4)Disconnect the leadwire from the turntable motor terminals.

5)Remove the screw securing the turntable motor to the oven cavity ASS’Y

6)After repairing the motor, rotate the removed turntable motor cover.

7)Fit the turntable motor cover’s projecting part to the base plate slit.

8)The taptite screw shall be used when a turntable motor cover is secured with a screw.

NOTE:

1.Remove the wire lead from the turntable motor VERY CAREFULLY.

2.Be sure to grasp the connector, not the wires, when removing.

Taptite Screw

Wire Leads

Turntable Motor

I.HIGH VOLTAGE TRANSFORMER REMOVAL

1)Discharge the high voltage capacitor.

2)Disconnect the leadwire from magnetron, high voltage transformer, and capacitor.

3)Remove the screw holding the high voltage transformer to the baseplate.

J. FAN MOTOR ASSEMBLY REMOVAL

1)Discharge the high voltage capacitor.

2)Disconnect the leadwire from fan motor and high voltage capacitor.

3)Remove the two screws holding the the suction guide ASS’Y to the oven cavity and remove the high voltage diode earth screw.

4)Remove the two screws holding the fan motor ASS’Y to the suction guide ASS’Y.

K.HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL

1)Discharge the high voltage capacitor.

2)Disconnect the leadwire from fan motor and high voltage capacitor.

3)Remove the screw holding the suction guide ASS’Y to the oven cavity and remove the high voltage diode earth screw.

4)Remove the screw holding the high voltage capacitor bracket.

Fan Motor

ASS'Y

Suction

Guide

H.V.

Transformer

H.V.

Diode

5-6

L. INTERLOCK SYSTEM

1)INTERLOCK MECHANISM

The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage.

ADJUSTMENT

DIRECTION

PRIMARY

SWITCH

MONITOR

SWITCH

SECONDARY

SWITCH

2)MOUNTING OF THE PRIMARY/MONITOR/ SECONDARY SWITCHES TO THE LATCH BOARD

3)INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY

Mount the latch board to the oven assembly.

Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed.

Tighten the mounting screw.

Check for play in the door by pushing the door release button. Door movement should be less than 0.5 mm. (1/64 inch)

Don't push the door release button while making this adjustment. Make sure that the latch moves smoothly after adjustment are completed and that the screws are tight. Make sure the primary, monitor, and secondary switches operate properly by following the continuity test procedure.

5-7

INTERLOCK CONTINUITY TEST

WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.

TYPE NO.SZM-V16-FA-63ORVP-533A-OFORV-5230QFOR PRIMARY SWITCH TYPENO.SZM-V16-FA-62ORVP-532A-OFORV-5220QFOR MONITOR SWITCH TYPENO.SZM-V16-FA-63ORVP-533A-OFORV-5230QFOR SECONDARY SWITCH

A. PRIMARY INTERLOCK SWITCH TEST

When the door release button is depressed slowly with the door closed, an audible click should be heard at the same time or successively at intervals. When the button is released slowly, the latches should activate the switches with an audibleclick.

If the latches do not activate the switches when the door is closed, the switches should be a adjusted in accordance with the adjustment procedure. Disconnect the wire lead from the primary switch. Connect the ohmmeter leads to the common (COM) and normally open (NO) terminal of the switch. The meter should indicate an open circuit in the door open condition. When the door is closed, the meter should indicate a closed circuit.

When the primary switch operation is abnormal, make the necessary adjustment or replace the switch only with the same type of switch.

B. SECONDARY INTERLOCK SWITCH TEST

Disconnect the wire lead from the secondary switch.

Connect the ohmmeter leads to the common (COM) and normally open (NO) terminals of the switch. The meter should indicate a open circuit in the door open condition. When the door is closed, meter should indicate an closed circuit. When the secondary switch operation is abnormal, make the necessary adjustment or replace the switch only with the same type of switch.

C. MONITOR SWITCH TEST

Disconnect the wire lead from the monitor switch. Connect the ohmmeter leads to the common (COM) and normally closed (NC) terminals of the switch. The meter should indicate closed circuit in the door open condition. When the door is closed, meter should indicate an open circuit. When the monitor switch operation is abnormal, replace with the same type of switch.

NOTE: After repairing the door or the interlock system, it is necessary to do this continuity test before operating the oven.

COMPONENTS

 

TEST PROCEDURE

RESULTS

SWITCHES

Check for continuity of the

 

Door

Door

(Wire leads removed)

switch with an Ohm-meter

 

open

closed

 

Primary

 

 

 

 

 

Switch

COM

NO

 

 

 

 

 

 

Monitor

NC

Switch

COM

Secondary

 

Switch

COM

 

NO

NOTE : After checking for the continuity of switches, make sure that they are connected correctly.

5-8

COMPONENT TEST PROCEDURE

CAUTIONS

1.DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)

2.ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN.

COMPONENTS

TEST PROCEDURE

RESULTS

HIGH VOLTAGE TRANSFORMER (Wire leads removed)

FILAMENT

PRIMARY

TERMINAL

 

1.

Measure the resistance.

Approx.: 0.2 ~ 0.4 ohm

 

 

(Ohm-meterscale: Rx1 and Rx100)

 

 

Approx.: 70 ~ 100 ohm

 

 

• Primary winding

 

 

Less than: 1 ohm

 

 

• Secondary winding

 

 

 

 

 

• Filament winding

 

 

2.

Measure the resistance.

 

 

 

(Ohm-meterscale: Rx1000)

Normal: Infinite

 

 

• Primary winding to ground

Normal: Infinite

 

 

• Filament winding to ground

 

 

 

 

MAGNETRON

1. Measure the resistance.

Normal: Less than 1 ohm

(Wire leads removed)

 

(Ohm-meterscale: Rx1)

 

 

 

• Filament terminal

 

 

2. Measure the resistance.

Normal: Infinite

 

 

(Ohm-meterscale: Rx1000)

 

 

 

• Filament to chassis

 

5-9

COMPONENTS

TEST PROCEDURE

RESULTS

Antenna

Gasket

Chassis

 

 

Filament

 

NOTE: When testing the magnetron, be sure to install the magnetron gasket

 

in the correct position and be sure that the gasket is in good condition.

HIGH VOLTAGE

Measure the resistance.

Normal: Momentarily indicates

CAPACITOR

(Ohm-meterscale: Rx1000)

several ohms, and

 

• Terminal to terminal.

then gradually returns

 

 

to infinite.

Measure the resistance.

Normal: Infinite.

(Ohm-meterscale: Rx1000)

 

• Terminal to case.

 

HIGH VOLTAGE

Measure the continuity (Forward).

Normal: Continuity.

DIODE

(Ohm-meterscale: Rx10000)

Abnormal: Infinite.

 

 

 

 

 

 

 

 

NOTE :

 

 

Some inexpensive meters

 

 

may indicate infinite

 

 

resistance in both direction.

Measure the continuity (Reverse).

Normal: Infinite.

 

(Ohm-meterscale: Rx10000)

Abnormal: Continuity.

5-10

COMPONENTS

TEST PROCEDURE

 

 

RESULTS

 

 

 

 

 

 

 

 

 

 

 

RELAY 2

Check for continuity of relay 2 with an

 

POWER

 

 

 

 

ohm-meter.

 

 

 

 

 

 

LEVEL

 

 

 

 

(Remove wire leads from relay 2 and

 

 

 

 

 

 

 

 

 

 

 

operate the unit.)

1

4 sec

 

18 sec

 

 

 

 

 

 

 

 

 

 

 

2

6 sec

 

16 sec

 

 

 

 

 

3

8 sec

 

14 sec

 

 

 

 

 

4

10 sec

 

12 sec

 

 

 

 

 

5

12 sec

 

10 sec

 

 

 

 

 

6

14 sec

 

8 sec

 

 

 

 

 

7

16 sec

 

6 sec

 

 

 

 

 

 

 

 

 

 

 

8

18 sec

 

4 sec

 

 

 

 

 

9

20 sec

 

2 sec

 

 

 

 

 

10

22 sec

 

0 sec

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FAN MOTOR

Measure the resistance.

Normal:

 

(Wire leads removed)

(Ohm-meterscale: R x 1)

A:Approx. 85

~ 100 ohm.

 

 

B:Approx. 10

~ 25 ohm.

 

 

Abnormal: Infinite or several

 

 

ohm.

TURNTABLE

Measure the resistance.

Normal: Approx. 100 ~ 150 ohm

MOTOR

(Ohm-meterscale: R x 1)

Abnormal: Infinite or several

(Wire leads removed)

 

 

 

 

ohm.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE : • A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON.

MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.

WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT THE WIRES.

5-11

TROUBLE SHOOTING

WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL.

CAUTIONS

1.Check grounding before checking for trouble.

2.Be careful of the high voltage circuit.

3.Discharge the high voltage capacitor. (See page 2-1)

4.When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire from these parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

5.Do not touch any part of the circuit on the PCB since static electric discharge may damage this control panel.

Always touch yourself to ground while working on this panel to discharge any static charge built up in your body. (Micom model only)

CONDITION

Microwave oven does not work.

Output power is too low.

Sparks occur.

Uneven cooking.

CAUSE

 

REMEDY

 

 

 

Inserting many plugs into oneoutlet and using them at the

same time.

(blown fuse or breaker)

Microwave oven plug is not inserted tightly.

Low AC input voltage.

Food temperature is too low.

Avoid using other electrical appliances when you use the microwave oven.

Insert microwave oven plug securely.

Use the microwave oven at adequate line voltage.

This may not be a defect. It is possible that the food should be cooked for a longer time period.

Using metallic ware and allowing it to touch the oven wall.

Ceramic ware trimmed in gold or silver powder is used.

Inconsistent intensity of microwave by their characteristics.

Do not use metallic ware for cooking except where noted in the cooking guide.

Do not use any type of cookware with metallic trimming.

1.Use plastic wrap or lid.

2.Stir once or twice while cooking soup, cocoa or milk, etc.

5-12

(TROUBLE 1) The following visual conditions indicate a probable defective control circuit.

1.Incomplete segments.

Segment missing.

Partial segment missing.

Digit flickering (NOTE: Slight flickering is normal.)

2.Colon does not turn on or blink.

3.A distinct change in the brightness of one or more numbers in display.

4.One or more digits in the display are not lighting.

5.Display indicates a number different from one touched,for example,key in 5 and3 appears in the display.

6.Specific numbers (for example 7 or 9) will not display when key pad is touched.

7.Display does not count down with time blinking or up with clock operation.

8.Display obviously jumps in time while counting down.

9.Display counts down too fast while cooking.

10.Each indicator light does not turn on after setting cooking cycle.

11.Display time of day does not reappear when cooking is finished.

CONDITION

1.No input can be programmed.

2.Some inputs cannot be programmed.

3.Display shows a number or figure different from one touched.

4.Random programming when touching other pads.

5.Display is fixed at some figure and can not accept any input.

CHECK

 

 

 

RESULT

 

 

CAUSE

 

 

REMEDY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the conn-

 

 

 

Continuity.

 

 

Defective PCB

 

 

Replace PCB

ection between

 

 

 

 

 

assembly.

 

 

assembly.

 

 

 

 

 

 

 

 

membrane key

 

 

 

 

 

 

 

 

 

 

assembly and

 

 

 

No continuity.

 

 

Loose

 

 

Connect them

PCB assembly.

 

 

 

 

 

connection.

 

 

tightly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace key

 

 

 

Everything works

 

 

Defective key

 

 

Replace key

membrane

 

 

 

as specified.

 

 

membrane

 

 

membrane

assembly and

 

 

 

 

 

 

assembly.

 

 

assembly.

check operation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Still have trouble.

 

 

Defective PCB

 

 

Replace PCB

 

 

 

 

 

 

assembly.

 

 

assembly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5-13

(TROUBLE 2) Oven does not operate at all, Display window does not display any figures, and no input is accepted.

CONDITION

 

 

CHECK

 

 

 

RESULT

 

 

CAUSE

 

 

REMEDY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Fuse blows.

 

 

Check continuity

 

 

 

Continuity.

 

 

Malfunction of the

 

 

Replace fuse,

 

 

of monitor

 

 

 

 

 

monitor switch.

 

 

primary, monitor,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

switch (with

 

 

 

 

 

 

 

 

 

secondary

 

 

 

door closed).

 

 

 

No continuity.

 

 

 

 

 

switches, and

 

 

 

 

 

 

 

 

 

 

 

 

RELAY(RY2) of

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace fuse

 

 

 

 

 

 

 

 

 

P.C.B Assembly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check continuity

Continuity.

of primary

 

switch (with

 

door opened)

No continuity.

 

Check continuity

Continuity.

of secondary

 

switch (with

 

door opened).

No continuity.

 

Disconnect one

Normal.

side of the wire

 

lead connected

 

from transformer

Fuse blows again

to the high

 

voltage

 

capacitor and

 

operate the unit.

 

Shorted contact at

 

 

Replace fuse,

 

 

primary, monitor,

the primary switch.

 

 

 

 

secondary

 

 

 

 

 

 

switches, and

 

 

 

 

RELAY(RY2) of

 

 

 

P.C.B Assembly.

 

 

 

 

 

 

 

 

Malfunction of

 

 

Replace fuse,

 

 

primary, monitor,

secondary switch.

 

 

 

 

secondary

 

 

 

 

 

 

switches, and

 

 

 

 

 

 

RELAY(RY2) of

 

 

 

P.C.B Assembly.

 

 

 

 

Defective high

 

 

Replace high

voltage capacitor.

 

 

voltage capacitor.

 

 

 

 

 

 

 

 

Defective high volt-

 

 

Replace high volt-

age transformer.

 

 

age transformer.

 

 

 

 

NOTE : All these switches must be replaced at the same time. Refer to page 5-7,5-8

2. Fuse does not

 

 

Check continuity

 

 

 

No continuity.

 

 

Defective

 

 

Replace

blow.

 

 

 

 

 

 

 

 

 

 

 

of thermostat.

 

 

 

 

 

 

thermostat.

 

 

thermostat.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Continuity.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check continuity

No continuity.

Defective power

Replace power

of power supply

supply cord.

supply cord.

 

cord.

 

 

 

5-14

(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched.

CONDITION

 

 

CHECK

 

RESULT

 

 

CAUSE

 

 

REMEDY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.Setting time

 

 

Check continuity

 

 

 

No continuity.

 

 

Defective

 

 

Replace

 

 

 

 

 

 

 

secondary switch.

 

 

secondary switch.

does not count

 

 

of secondary

 

 

 

 

 

 

 

 

down when

 

 

switch (with

 

 

 

 

 

 

 

 

 

 

touching START

 

 

door closed).

 

 

 

Continuity.

 

 

 

 

 

 

pad.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the con-

Continuity

 

nection between

 

 

 

CN1 connector

 

 

and PCB

No continuity

 

assembly.

 

 

2. Fan motor or

Check fan motor.

Abnormal

oven lamp do

 

 

not turn on.

Check oven lamp.

Abnormal

 

 

Normal

Defective PCB

 

 

Replace PCB

assembly.

 

 

assembly.

 

 

 

 

 

 

 

 

Loose connection.

 

 

Connection then

 

 

tightly.

 

 

 

 

 

 

 

 

 

 

 

Defective fan motor.

 

 

Replace fan motor.

 

 

 

 

 

 

 

 

 

 

Defective oven lamp.

 

 

Defective oven lamp.

 

 

 

 

 

 

(TROUBLE 4) Oven seems to be operation but little heat is produced in oven load.

CONDITION

 

CHECK

 

RESULT

 

CAUSE

 

REMEDY

 

 

 

 

 

 

 

 

 

Output is low.

 

Check the

 

 

Lower than 90% of

 

 

 

 

rating voltage.

 

 

 

 

 

 

power source

 

 

 

 

 

 

 

 

 

 

voltage.

 

 

 

 

 

 

Normal.

Disconnect the

Abnormal.

wire leads from

 

relay 2 and

 

check on and off

Normal.

time with

 

multitester.

 

Decrease in power source voltage with load.

Defective PCB assembly.

Measure the

Abnormal.

Defective

output power.

magnetron.

 

Suggest customer contact local electric power utility co. or qualified electrician.

Replace PCB assembly.

Replace magnetron.

NOTE: Simple test of power output-conductedby heating one liter water for one min. if available. Minimum 8.5oC temperature rise is normal condition.

5-15

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly)

CONDITION

 

 

CHECK

 

 

 

RESULT

 

 

CAUSE

 

 

REMEDY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No microwave

 

 

Disconnect the

 

 

 

No continuity.

 

 

Defective PCB

 

 

Replace PCB

oscillation.

 

 

 

 

 

 

 

assembly

 

 

assembly

 

 

wire leads from

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

relay 2 and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

check continuity

 

 

 

Continuity.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of relay2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Operate the unit)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check high vol-

Abnormal

Defective high

tage transformer

voltage

 

 

 

transformer.

 

normal

 

Check high vol-

Abnormal

Defective high

tage capacitor.

voltage capacitor.

 

 

normal

 

Check high vol-

Abnormal

Defective high

tage diode.

voltage diode.

 

normal

Check

Abnormal

Defective

Magnetron.

magnetron.

 

Replace high voltage transformer.

Replace high voltage capacitor.

Replace high voltage diode.

Replace magnetron.

NOTE: • Make sure the wire leads correct position.

When Removing the wire leads from the parts, be sure to grasp the connector, not the wires.

When removing the magnetron, be sure to install the magnetron gasket in the correct position and in good condition.

Output is full power when you set lower power level.

Disconnect the

 

 

Abnormal.

 

 

wire leads from

 

 

 

relay 2 and check

 

 

 

continuity relay 2.

 

 

 

(Operate the unit)

 

 

 

 

 

 

 

Defective PCB

 

 

Replace PCB

assembly

 

 

assembly

 

 

 

 

5-16

#EV#

EXPLODED VIEW

INTRODUCTION

MODEL:

SENSOR PARTS

 

OVEN CAVITY PARTS

 

INTERIOR PARTS

DOOR PARTS

BASE PLATE PARTS

 

LATCH BOARD PARTS

CONTROL PANEL PARTS

MFL552

MAY000

-6-1-

#EV#

DOOR PARTS

13581A

13552A

13536A

13213A

13551A

14026A

14970A

-6-2-

#EV#

CONTROLLER PARTS

24781M

23551A

23550D 268711

WTP018

24510L

24970A

23551B

-6-3-

#EV#

OVEN CAVITY PARTS

33112U

WSZ185 Button Head

 

(Torx style 2)

33052A

WTT020

33390G

36549S

35889A

WTP013

-6-4-