Touch the Clear pad whenever you need to cancel an entry or a function currently in use. The display will either return to the last item entered or to the clock.

3. CHILD LOCK

This oven has a CHILD LOCK feature. TO SET CHILD LOCK Touch the Clear pad Touch Clear pad L appear in the display. TO CANCEL CHILD LOCK Touch the Clear pad L disappears. Touch Clear pad

4. QUICK START

Clear Quick start

5. MICROWAVE COOKING

Clear Power Time Quick Start

6. GRILL COOKING

Clear Grill Time Quick Start

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). 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.

FUSE PRIMARY SWITCH

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.
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.

WHEN TOUCHING THE START KEY WITH THE GRILL COOKING FUNCTION SELECTED
The contacts of the primary switch and the secondary switch close the circuit. A.C. voltage is applied to the grill heater through grill thermostat as shown by the solid line.

GRILL THERMOSTAT

GRILL HEATER

RELAY 3

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
Turntable rotates. The fan motor rotates. The air is also directed into the oven to exhaust the vapor in the oven through the base plate and upper plate.

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 4 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 2inch (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 (Magnetron, H.V. Transformer, H.V. Capacitor, H.V. Cable Assy, H.V. Circuit Protector)
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.
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 opened position-less than 2 mW/cm.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 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 190 mm. 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 (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 turntable 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 5K.

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 after bown M : Weight of bowl
is measured while the microwave generator is operating at full power. Magnetron filament heat-up time 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 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/cm. (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 Hinge Plate
E. 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.
F. FAN MOTOR ASSEMBLY REMOVAL
1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from fan motor, noise filter and high voltage capacitor. 3) Remove the two screws holding the the suction guide ASSY to the oven cavity and remove the high voltage diode earth screw. 4) Remove the screw of the capacitor bracket. 5) Remove the two screws holding the fan motor ASSY to the suction guide ASSY.
G. HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL

1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from fan motor, noise filter and high voltage capacitor. 3) Remove the screw holding the suction guide ASSY 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

Remove Door Assembly

H.V Capacitor

H.V Transformer

H.V. Diode
H. AIR DUCT ASSEMBLY REMOVAL
1) Disconnect the leadwire from lamp. 2) Remove the mounting screw to Latch Board.
J. REMOVING THE TURNTABLE MOTOR
1) Remove the turntable. 2) Remove the Rotating Ring. 3) Lay the unit down on its back. 4) Remove the turntable motor cover. The turntable base cover is easily removed by pinching the six parts with a wire cutting. 5) Disconnect the leadwire from the turntable motor terminals. 6) Remove the screw securing the turntable motor to the oven cavity ASSY 7) After repairing the motor, rotate the removed turntable motor cover. 8) Fit the turntable motor covers projecting part to the base plate slit. 9) 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

I. MAGNETRON REMOVAL

1) Disconnect the leadwire from the high voltage transformer and high voltage capacitor. 2) Carefully remove the mounting screws holding the magnetron and the waveguide. 3) Remove the magnetron ASSY 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.
Magnetron Waveguide Dome Waveguide Bracket Magnetron Gasket Magnetron Wire Leads Turntable Motor Taptite Screw

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

PRIMARY SWITCH
MONITOR SWITCH SECONDARY 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. DIODE H.V. CAPACITOR PRIMARY CIRCUIT PROTECTOR
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.
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

SWITCHES (Wire leads removed)

TEST PROCEDURE

Check for continuity of the switch with an Ohm-meter Primary Switch

RESULTS

Door open Door close

NO COM

Monitor Switch

NC COM

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

COMPONENT TEST PROCEDURE

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.
HIGH VOLTAGE TRANSFORMER (Wire leads removed)
FILAMENT WINDING TERMINAL

SECONDARY TERMINAL

PRIMARY TERMINAL
1. Measure the resistance. (Ohm-meter scale: Rx1 and Rx100) Primary winding Secondary winding Filament winding 2. Measure the resistance. (Ohm-meter scale: Rx1000) Primary winding to ground Filament winding to ground MAGNETRON (Wire leads removed) 1. Measure the resistance. (Ohm-meter scale: Rx1) Filament terminal 2. Measure the resistance. (Ohm-meter scale: Rx1000) Filament to chassis
Approx.: 2.5 Approx.: 110 Less than: 0.4

Normal: Normal:

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
HEATER ELEMENT (Wire leads removed.)
Measure the resistance. (Multi-meter scale: Rx1)
Normal: *Grill heater Approx. 38 ohm (at 20 ~ 30oC)
Measure the resistance with 500V-100M ohm Normal: more than 0.5 Mohm insulation resistance meter.
NOTE: Make sure heater is fully cooled when tested. GRILL THERMOSTAT 0C~Approx.90C Approx.90C OVEN THERMOSTAT MAGNETRON THERMOSTAT
0C~Approx.145C Approx.145C
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 Relay 3: Grill

Cooking Start

Relay 3

Relay 1

Relay 2
FAN MOTOR (Wire leads removed)
Measure the resistance. (Ohm-meter scale: R x 1)
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) Oven lamp does not turn on when the timer knob is pushed with door closed.
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. Loose connection.
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.
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.

Check fan motor.

Defective fan motor. Defective oven lamp.

Check oven lamp.

No continuity. Normal.
(TROUBLE 4) Oven seems to be operation but little heat is produced in oven load. CONDITION

Output is low.

Check the power source voltage.
Lower than 90% of rating voltage. Normal.
Decrease in power source voltage with load.
Suggest customer contact local electric power utility co. or qualified electrician.
Disconnect the wire leads from relay 2 and check on and off time with multitester.

Abnormal. Abnormal.

Defective P.C.B assembly.

Replace P.C.B assembly.

Measure the Abnormal. output.

Abnormal.

Defective magnetron.

Replace magnetron.

NOTE: Simple test of power output-conducted by heating one liter water for one min. if available.
(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION
No microwave oscillation.
Disconnect the wire leads from relay 2 and check continuity of relay2. (Operate the unit)

Defective P.C.B assembly

Replace P.C.B assembly

Check H.V. transformer.

Abnormal
Defective high voltage transformer.
Replace high voltage transformer.

normal

Check H.V. capacitor.
Defective high voltage capacitor.
Replace high voltage capacitor.

Check H.V. diode.

Defective high voltage Diode.
Replace high voltage Diode.

Check Magnetron.

(TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION
Output is full when you set lower power level.
Disconnect the wire leads from relay 2 and check continuity relay 2. (Operate the unit)
Defective P.C.B. assembly.

Replace P.C.B. assembly.

(TROUBLE 7) Grill CONDITION
1. Heater is not operating.

Heater.

Malfunction the heater.

Replace.

Thermostat and relay3.(Grill)
Malfunction the thermostat.
Normal. Replace or connect tightly.

Wire connection.

Open or loosen.
1. Lower temperature the oven.
NOTE: * Make sure the wore leads correct position. * When removing the wire leads from 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.

EXPLODED VIEW

INTRODUCTION

OVEN CAVITY PARTS

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

DOOR PARTS

13581A

13536A 13552A 13213A

13720D 14890A

14026A

WTT028 14970A 13650A

CONTROL PANEL PARTS

268711

268712

WTP013

23572A

25020M

23806C

249401 243501

WTP004

25020S

24781S

348102

WNH001 WTT021

348101 44360A

348101

WTT020

WTT011 33052M 33112U

35026G
35026C 368771 33390G 35300A WTP013 36549S

4980W1A058B

34370T 35889A

LATCH BOARD PARTS

43501A

43500A

466001

466003

44510A

WSZ085

INTERIOR PARTS

568771 WSZ062

56411A 56930V

50FZZA 56201A 56549F

WTT028 54974S

WSZ002

55900A WTT037
WSZ002 50CZZH WTP004 56930G 56912B WSZ56851C 55262A 54810C

WTT028

56324A

BASE PLATE PARTS

56170D

63302A

63303A

65006B

WTT021