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MICROWAVE OVEN

SERVICE MANUAL

MODEL: MS-1904H

CAUTION

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

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Summary of Contents for MS-1904H

Page 1: ...MICROWAVE OVEN SERVICE MANUAL MODEL MS 1904H CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

Page 2: ...nd 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 t...

Page 3: ... CIRCUIT DESCRIPTION 4 4 SERVICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS 5 1 MICROWAVE LEAKAGE TEST 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT 5 3 DISASSEMBLY AND ADJUSTMENT 5 3 INTERLOCK CONTINUITY TEST 5 7 COMPONENT TEST PROCEDURE 5 8 TROUBLE SHOOTING 5 12 EXPLODED VIEW 6 1 REPLACEMENT PARTS LIST 7 1 SCHEMATIC DIAGRAM OF P C B 8 1 PRINTED CIRCUIT BOARD 8 2 P C B PARTS LIST 9 1 CONTENTS ...

Page 4: ...4H 230 Volts AC 60 Hz 1 000 Watts Single phase 3 wire grounded 700 Watts full microwave power IEC705 2 450 MHz 2M218J 0 99 min 50 sec 483 W x 285 H x 360 D mm 312 W x 198 H x 316 D mm 11 kg approx 12 5 kg approx Microwave Power for Variable Cooking Power level Max Full power throughout the cooking time Med High approx 80 of Full power Medium approx 60 of Full power Defrost approx 40 of Full power ...

Page 5: ... 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 2 1 CAUTIONS Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free fro...

Page 6: ...lat 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 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 WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT As the colors of the wire...

Page 7: ...s except time of day 5 DEFROST This feature provides you with the best defrosting method for frozen foods 6 START EZ on This feature turns the oven on instantly 7 POWER Used to set power 8 DIAL 4 1 OPERATING INSTRUCTIONS Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Door Open Button Safety Door Lock System Turntable Rotating Ring 1 2 3 4 6 7 5 ...

Page 8: ...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 QUICK START 4 AUTO WEIGHT DEFROST COOKING 5 AUTO COOK 4 2 Stop Start Stop Desired auto cook category STOP Stop Desired defrost category Desired cooking weight Desired food weight Start Start Stop Desired power level Desired cooking time Start ...

Page 9: ...SCHEMATIC DIAGRAM 4 3 ...

Page 10: ...ximately 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 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 a...

Page 11: ...DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS INTERIOR PARTS BASE PLATE PARTS OVEN CAVITY PARTS 6 1 EXPLODED VIEW INTRODUCTION ...

Page 12: ...6 2 13552A 13213A 13581A 13720D 14970A 14026A 13536A 13352A DOOR PARTS ...

Page 13: ...6 3 23572A 24781M WTP018 268711 WTT028 WTP004 24510L 250201 24970A 26638A CONTROL PANEL PARTS FOR MS 198H ...

Page 14: ...6 4 CONTROL PANEL PARTS FOR MS 199H 23572A 24781M WTP018 268711 WTT028 WTP004 24510L 250201 24970A 249401 26638A ...

Page 15: ...6 5 33052M 33112U WTT021 34960A 36549S WTP013 33390G 35889A 340511 OVEN CAVITY PARTS ...

Page 16: ...6 6 466001 466003 WTT028 466001 435001 56912B 55262A WSZ085 LATCH BOARD PARTS ...

Page 17: ...6 7 56201B 568771 56930V 56411A 54974S 56201A 56549F WTT037 WTT028 WSZ002 55900A 56324A WSZ002 50FZZA INTERIOR PARTS ...

Page 18: ...6 8 56170D 63302A 63303A WTT021 WSZ002 65006B 65006B 50CZZH WSZ002 54810C 56851D 56901A BASE PLATE PARTS ...

Page 19: ...8 1 SCHEMATIC DIAGRAM OF P C B ...

Page 20: ...8 2 PRINTED CIRCUIT BOARD ...

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