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MICROWAVE OVEN
SERVICE MANUAL

MODEL: MS-1905C

CAUTION

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

Содержание MS-1905C

Страница 1: ...MICROWAVE OVEN SERVICE MANUAL MODEL MS 1905C CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

Страница 2: ... Control Complement Nameplate Location Accessories Left side of control panel Back cover OR DESCRIPTION MS 1905C 230 Volts AC 50 Hz Single phase 3 wire grounded Microwave 1 150W microwave power IEC705 750W 2 450 MHz 2M214 39F 2M218J 2M254J 0 60 min 483 W x 285 H x 334 D mm 300 W x 193 H x 316 D mm 13 7 kg approx 15 1 kg approx Microwave Power for Variable Cooking Power level MAX 600W 360W DEFROST ...

Страница 3: ...or Open Button Safety Door Lock System Turntable Rotating Rest CONTROL PANEL 90 360 600 max 0 1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 defrost 1 2 3 1 POWER CONTROL KNOB Used to select the desired power level for cooking 2 TIMER KNOB Used to set the cooking time 3 DOOR OPEN BUTTON Press to open the door ...

Страница 4: ...arts At the end of cooking time you will hear a single ring sound and the lamp is turn off NOTE Each number represents minutes To ensure accurate timing it is advisable to turn the timer knob slightly passed the desired cooking time and then back to the proposed setting Press the door opener to check the cooking condition during oven operation Opening the door during oven operation automatically t...

Страница 5: ...N FIRE ELECTRICAL SHOCK AND HAZARDS WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURER S SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM NOTICE SINCE THIS IS BASIC SCHEMATIC DIAGRAM THE VALUES OF COMPONENTS AND SOME PARTIAL CONNECTIONS ARE SUBJECT TO CHANGE FOR IMPROVEMENT NOISE FILTER MONITOR RESISTOR A C RELAY ...

Страница 6: ...er starts rotating 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 diode and charging of the high vol...

Страница 7: ...MICROWAVE OVEN SERVICE MANUAL MODEL MS 1905C CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

Страница 8: ...nsity 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 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...

Страница 9: ...e 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 t...

Страница 10: ...output P in watts is calculated from the following formula 4187 x T T 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 o...

Страница 11: ...re 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 b...

Страница 12: ...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 5 5 Magnetron Waveguide Magnetron Gasket Magnetron Dome Waveguide Bracket G SUCTION GUIDE MAIN ASSEMBLY NOTE Suction Guide Main ASS Y consists of Latch Board ASS Y and Suction Guide ASS Y To repair any of th...

Страница 13: ...Y consists of Latch Board ASS Y and Suction Guide ASS Y To repair any of them should be removed first Suction Guide Main ASS Y 1 Disconnect the leadwire from fan motor 2 Remove the fan 3 Remove the two screws holding the fan motor assembly to the suction guide ass y Fan Motor ASS Y Suction Guide J HIGH VOLTAGE TRANSFORMER REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire fro...

Страница 14: ...hich 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 PRIMARY SWITCH ADJUSTMENT DIRECTION MONITOR SWITCH SECONDARY SWITCH 3 INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY Mount t...

Страница 15: ...osed 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 ...

Страница 16: ... RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 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 1 Measure the resistance Ohm meter scale Rx1 Filament terminal 2 Measure the resistance Ohm meter scale Rx1000 ...

Страница 17: ...0 Terminal to case Measure the continuity Forward Ohm meter scale Rx10000 Measure the continuity Reverse Ohm meter scale Rx10000 Normal Momentarily indicates several ohms and then gradually returns to infinite Normal Infinite Normal Continuity Abnormal Infinite Normal Infinite Abnormal Continuity NOTE When testing the magnetron be sure to install the magnetron gasket in the correct position and be...

Страница 18: ...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 Normal Abnormal ...

Страница 19: ...R x 1000 Note A is timer ON OFF switch B is power supply terminal of the timer motor C is defrost switch Normal Approx 350 400 ohm Abnormal Infinite or several ohm Normal Approx 16 Kohm Abnormal Infinite or several 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 FRO...

Страница 20: ...oading Microwave oven plug is not inserted tightly Output power is too low Low AC input voltage Food temperature is too low Using metallic ware and allowing it to touch the oven wall Sparks occur Inconsistent intensity of microwave by their characteristics 1 Use plastic wrap or lid 2 Stir once or twice while cooking soup cocoa or milk etc Uneven cooking Ceramic ware trimmed in gold or silver powde...

Страница 21: ...ned Disconnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit Replace fuse 1 Oven does not operate No continuity No continuity Adjust or replace Malfunction of the primary switch Malfunction of the secondary switch Adjust or replace Check the continuity of the primary switch with door closed Check the continuity of the secondary switch with ...

Страница 22: ...C magnetron Replace Decrease in power source voltage with load Suggest customer contact local electric power utility co or qualified electrician Check the power source voltage oscillating No continuity No continuity replace Malfunction of the timer switch Faulty thermostat replace Check the continuity of the timer switch contacts Check the continuity of the thermostat CONDITION CHECK RESULT CAUSE ...

Страница 23: ...control switch cooking state Abnormal Open the secondary winding of the high voltage transformer of faulty insulation of filament winding Replace Check H V transformer Abnormal Shorted H V diode Replace Check H V diode Abnormal Faulty capacitor Replace Check H V capacitor Abnormal Faulty magnetron Replace Magnetron TROUBLE 4 Oven does not cook at all even though turntable rotates ...

Страница 24: ...6 1 DOOR PARTS SUCTION GUIDE MAIN PARTS CONTROL PANEL PARTS INTERIOR PARTS BASE PLATE PARTS OVEN CAVITY PARTS EXPLODED VIEW INTRODUCTION ...

Страница 25: ...6 2 13213A 13552A 13536A 14026A 14970A 13581A 13352A 13720D DOOR PARTS ...

Страница 26: ...6 3 250201 24970A 24781T 24510L 26549T 249401 249401 23572A WTP015 WTP015 CONTROL PANEL ASSEMBLY PARTS ...

Страница 27: ...6 4 30RMZZ WTT021 WTT021 WTT021 WSZ092 WTP013 948502 33052M 948501 34960A 34036W 36549S 368771 35889A 968101 33112U 33390G OVEN CAVITY PARTS ...

Страница 28: ...6 5 WSZ085 WTT037 WTT028 WTT028 WSZ084 WTT028 56912B 55900A 54974S 969201 56549F 43501A 466001 466003 466001 43500A 56930V 50FZZA 56201A 568771 SUCTION GUIDE PARTS ...

Страница 29: ...6 6 INTERIOR PARTS WSZ062 56411A 56324A 56201B WSZ002 ...

Страница 30: ...6 7 647781 63302A 54810C 56851C 56851D 56170D 63303A 647781 WSZ002 50CZZH WSZ062 WTT028 948503 BASE PLATE PARTS ...

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