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MICROWAVE OVEN SERVICE MANUAL
MODEL: MS-196VUW MS-196VUS MS-196VUT

CAUTION

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

P/NO : 3828W5S5295

August, 2005 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.

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

Rating Lavel Location

Accessories
Owner's manual Glass turntable Roller Rest
This microwave oven is designed for household use only. It is not recommended for commercial purposes.

CAUTIONS

Unlike other appliances, the microwave oven is high-voltage and high-current equipment. Though it is free from danger in ordinary use, extreme care should be taken during repair.
DO NOT operate on a 2-wire extension 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 stops, 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.
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
Remove your watches whenever working close to or replacing the Magnetron. 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.

MAGNETRON

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

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 104F(40C). 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. 8. Do not touch the front glass during or after cooking of the Grill and Combination mode. This glass is very hot during heater operating. 9. Do not operate the oven at microwave and combination mode with Grill rack placed in the cavity when the oven is empty.

EARTHING INSTRUCTIONS

This microwave oven is designed to be used in a fully earthed condition. It is imperative, therefore, to make sure it is properly earthed before servicing
WARNINGTHIS APPLIANCE MUST BE EARTHED

IMPORTANT

The wires in this mains lead are colored in accordance with the following code: Green-and-yellow: Blue: Brown: Earth Neutral Live
As the colors of the wires in the mains lead of this appliance may not correspond with the colored markings identifying the terminals in your plug, proceed as follows. The wire which is colored green-and-yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol ( ) or colored green or green-and-yellow. The wire which is colored blue must be connected to the terminal in the plug which is marked with the letter N or colored black. The wire which is colored brown must be connected to the terminal in the plug which is marked with the letter L or colored red.

OPERATING INSTRUCTIONS

FEATURES
Oven Front Plate Window Door Screen Door Seal
Control Panel Door Open Button Safety Door Lock System Turntable Roller Rest

CONTROL PANEL

1. INDICATORS 2. CLOCK: Used to set the time of day. 3. TIMER: 4. POWER: Used to select the desired power level for cooking. 5. FAVORITE COOK: 6. AUTO COOK: Used to cook the foods listed by one touch. 7. AUTO DEFROST: Used to select the auto weight defrost. 8. QUICK DEFROST: Used to select the auto weight defrost. 9. DIAL: 10. STOP/CLEAR: Used to stop over and clear all entries except time of day. 11. START: One tap allows over to begin functioning.

OPERATING SEQUENCE

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

6. AUTO WEIGHT DEFROST

Stop/ Clear Desired defrost category Desired cooking time Start

1. SETTING THE CLOCK

Stop/ Clear Clock Set the hour by touching DIAL Start

7. FAVORITE COOK

Stop/ Clear Favorite cook Start

Set the minute

NOTE: You can set 12 hour clock or 24 hour clock optionally.

8. CHILD LOCK

This oven has a CHILD LOCK feature TO SET CHILD LOCK Touch the Stop/Clear pad Touch STOP pad L appear in the display. TO CANCEL CHILD LOCK Touch the Stop/Clear pad touch STOP pad L 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. QUICK START

Stop/Clear Start

4. MICROWAVE COOKING

Stop/ Clear Desired cooking time Desired cooking time Start Desired cooking time Start
5. MULTI-STAGE MICROWAVE COOKING
1ST STAGE Stop/ Clear Power Time Start

2ND STAGE Stop/ Clear

SCHEMATIC DIAGRAM

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).
WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUM.
The micom controller controls the ON-OFF time of relay 2 by the applied signal to vary the average output power of microwave oven as POWER LEVEL. (refer to page 1-1)
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-OFF of 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.

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 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 SWITCH

MONITOR SWITCH H.V. TRANSFORMER

SECONDARY SWITCH

RELAY 2 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. 3.2 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-preventing choke coils. 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 4000 Volts DC is applied to the filament of the magnetron.

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 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: 100C or 212F (1 deg scale)

MICROWAVE LEAKAGE TEST

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

MEASURING MICROWAVE ENERGY LEAKAGE
Pour 27515cc of 205C(689F) 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 2450 MHz and use it following the manufacturer's recommended test procedure to assure correct result. When measuring the leakage, always use the 2-inch (5cm) 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 ( 1in/sec)
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 below Fig.) - Around the magnetron - The waveguide

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 between 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, this may possibly cause probe damage.
WARNING : AVOID CONTACTING ANY HIGH VOLTAGE PARTS
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/cm2.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.
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/cm2.sq. Leakage for a fully assembled oven (Before the latch switch (primary) is interrupted) with the door in a slightly opened position-less than 2 mW/cm2.sq.

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 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 190 mm. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial temperature (1) of the water is (102)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 shelf which is in the lowest position and the microwave power switched on. The time T for the temperature of the water to rise by a value T of (102)K is measured, where T is the time in seconds and T 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 : P= 4187 x (T) + 0.55 X (T2 -T0 )X M 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-up time is not included. 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 and along side edges of the case. The outer case must be moved backward to be lifted off.
C. CONTROL PANEL ASSEMBLY
1) Disconnect the leadwire from the PCB SUB ASSY. 2) Remove the screws for the earth and securing the control panel. 3) Lift control panel ASSY from the oven by the tab unhooked.

B. POWER SUPPLY CORD

1) Remove the outer case. 2) Disconnect two terminals, and remove one screw of the earth terminal.
CAUTION: DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING (refer to page 2-1)
D. DOOR GROSS ASSEMBLY REMOVAL
1) Open the door. 2) Remove the choke cover cap very carefully with a flat-blade screwdriver. 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 5 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 door Assembly

Magnetron

Air Duct
Magnetron Magnetron Gasket Waveguide Bracket Dome Waveguide

K. 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 ASSY to the control panel. 3) Disconnect the flat cable from the PCB SUB ASSY and take off the PCB SUB ASSY.

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

ADJUSTMENT DIRECTION

MONITOR SWITCH
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 les than 0.5 mm. (1/64 inch) Don't push the door release button while making 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. FIG. 1
CAUTION: CHECK THE CORRECT POSITION
H.V. TRANSFORMER H.V.FUSE H.V. DIODE H.V. CAPACITOR PRIMARY
INTERLOCK CONTINUITY TEST
WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.
TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR 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 audible click. 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.

Approx.: 1.4 ohm Approx.: 90 ohm Less than: 0.4

Normal: Normal:

1. Measure the resistance. (Ohm-meter scale: Rx1) Filament terminal 2. Measure the resistance. (Ohm-meter scale: Rx1000) Filament to chassis

Normal: Less than 1

Normal:

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 CAPACITOR Measure the resistance. (Ohm-meter scale: Rx1000) Terminal to terminal. Normal: Momentarily indicates several ohms, and then gradually returns to infinite.
Measure the resistance. (Ohm-meter scale: Rx1000) Terminal to case.

HIGH VOLTAGE DIODE

Measure the continuity (Forward). (Ohm-meter scale: Rx10000)
Normal: Continuity. Abnormal:
NOTE : Some inexpensive meters may indicate infinite resistance in both direction.
Measure the continuity (Reverse). (Ohm-meter scale: Rx10000)
Normal: Abnormal: Continuity.
Check for continuity of the fuse with an multi-meter.

Normal Abnormal

NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time. Replace just the fuse if the switches operate normally. H.V. FUSE Check for continuity of the H.V.Fuse with multi-meter. Normal Abnormal

GRILL THERMOSTAT

NOTE: Make sure heater is fully cooled when tested. 0C~Approx.110C Over 110C
OVEN THERMOSTAT MAGNETRON THERMOSTAT
Disconnect the 8 pin connector from P.C.B. (Refer to schemetic diagram)
Check for P.C.B. connector.

Cooking Start OFF

RELAY 2, RELAY 3 OF P.C.B. (Wire leads removed.) Note: Relay Relay 1: Fan motor Turntable motor Oven lamp Relay 2: Microwave

Cooking Start

FAN MOTOR (Wire leads removed)
Measure the resistance. (Ohm-meter scale: R x 100)
Normal: A~B 40 ~ 60 A~C 300~500

Abnormal: or several

TURNTABLE MOTOR (Wire leads removed)

Measure the resistance. (Ohm-meter scale: R x 1000)
Normal: Approx. 100~200 Abnormal: or several
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.

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.
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 circuitry on the digital programmer circuit since static electric discharge may damage this control panel. Always touch yourself ground while working on this panel to discharge any static charge built up in your body.

CONDITION

Microwave oven does not work.
Inserting many plug into one plug outlet and using them at the same time (causes overloading). Microwave oven plug is not inserted tightly.

REMEDY

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. 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. Wrap the thinner part with aluminum foil. 2. Use plastic wrap or lid. 3. Stir once or twice while cooking soup, cocoa or milk, etc. Distribute food evenly. Cook smaller portions and,or use lighter weight cookware.

Output power is too low.

Low AC input voltage.
Food temperature is too low.

Sparks occurring.

Using metallic ware and allowing it to touch the oven wall. Ceramic ware trimmed in gold or silver powder is used.

Uneven cooking.

Inconsistent intensity of microwave by their characteristics.
Turntable drags or makes noise.
IExcessive weight on tray or improperly balanced.
(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 and 3 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. 12. Beep sound is not heard when correct key is touched.

1. No input can be programmed.
Check the connection between membrane key assembly and PCB assembly. Replace key membrane assembly and check operation.

RESULT

Continuity.
Defective PCB assembly. Loose connection. Defective key membrane assembly. Defective PCB assembly.
Replace PCB assembly. Connect them tightly. Replace key membrane assembly. Replace PCB assembly.

No continuity.

2. Some inputs cannot be programmed. 3. Display shows a number or figure different from one touched.
Everything works as specified.

Still have trouble.

4. Random programming when touching other pads.
5. Display is fixed at some figure and can not accept any input.
(TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and no input is accepted. CONDITION

1. Fuse blows.

Check continuity of monitor switch (with door closed). Replace fuse
Malfunction of the monitor switch.
Replace primary and monitor switches.
Check continuity of primary switch (with door opened).
Shorted contact at the primary switch.
Disconnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit.

Normal.

Defective high voltage capacitor. Defective high voltage transformer.
Replace high voltage capacitor. Replace high voltage transformer.

Fuse blows again

NOTE : All these switches must be replaced at the same time. Refer to page 5-6, 5-7

2. Fuse does not blow.

Check continuity of magnetron thermostat.
Defective magnetron thermostat.
Replace magnetron thermostat.
Check continuity of power supply cord.
Defective power supply cord.
Replace power supply cord.
(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
1.Setting time does not count down when touching START pad.
Check continuity of secondary switch (with door closed).
Defective secondary switch.
Replace secondary switch.
Check the connection between connector and P.C.B assembly.
Defective P.C.B assembly. Loose connection.
Replace P.C.B assembly. Connection then tightly. Replace fan motor. Replace oven lamp.
Continuity. 2. Fan motor or oven lamp do not turn on.

OVEN CAVITY PARTS
INTERIOR PARTS DOOR PARTS BASE PLATE PARTS
LATCH BOARD PARTS CONTROL PANEL PARTS

DOOR PARTS

13581A

13536A 13552A

13213A

14890A 13720D

14026A

14970A

CONTROL PANEL PARTS

24781S 23790D

268711

WTP004

250202

WTP018

249401

250201

24510L

23572A

250203 24970A
35006U 34810Q 33112U WTT021

34810Q WTT021

WTT010 WTT020
For model MS-196VUW MS-196VUT For model MS-196VUS

33052A

33390G 35889A 36549S

WTP013

63861A

LATCH BOARD PARTS

43501A

43500A

466001

466003

WSZ085

INTERIOR PARTS

WSZ002 56930V

WSZ062

56411A

56324A

WSZ002 50FZZA WTT028 56201A WTT037 56549F 55900A 54974S

56851D

WSZ002 50CZZH 56912B 54810C 56901A WTT028

568771

55262A

BASE PLATE PARTS

56170D

63303A

63302A

WTT028 65006B

WSZ002

Electrical outputs

product
Microwave Oven Microwave Oven Dishwasher Dishwasher Refrigerator 2* Refrigerator 4* Refrigerator 4* Built-in Baking Oven Built-in Baking Oven Pantry top with cooking plates
MS-196VUW MS-196VUT DW 3023 ESF 2410 KS 110 A UKS 1434 UKS 1434 EB KU WE Multi

voltage

220-240 volt 220-240 volt 220-240 volt 220-240 volt 220-240 volt 220-240 volt 220-240 volt 220-240 volt 220-240 volt

capacity

800 watt 800 watt 1050 watt 1280 watt 135 watt 1280 watt 1280 watt 2300 Watt 2300 Watt

ampere

8 ampere 8 ampere 6 ampere 8 ampere 0.7 ampere 10 ampere 10 ampere 10 ampere 10 ampere

socket

1x shockproof socket 1x shockproof socket 1x shockproof socket 1x shockproof socket 1x shockproof socket 1x shockproof socket 1x shockproof socket 1x shockproof socket 1x shockproof socket

energy efficiency

----B A A A A plus B B

energy consumption

----0.74 kilowatt hour 0.57 kilowatt hour 153 kilowatt year 226.3 kilowatt year 184 kilowatt year 2.2 kilowatt hour 2.2 kilowatt hour

fuse protection

These electrical appliance can be pursued with multiple outlets in once Circuit. Attention, the whole achievement from approx. 2500-3000 watts per circuit may not be exceed " The oven can be connected with a separate Circuit in shockproof socket, thus 230 volts The cooking field should have an only, or with the fridge a separate circuit. Other appliances need additional ones Circuits
the actual energy consumption depends on the kind and use of the device.

220-240 volt

3000 watt

13,5 ampere

1x shockproof socket