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MICROWAVE OVEN

SERVICE MANUAL

CAUTION

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

MODEL: MA-972M

MA-972MW

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Summary of Contents for MA-972M

Page 1: ...MICROWAVE OVEN SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL MA 972M MA 972MW ...

Page 2: ...sary 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 c...

Page 3: ...C DIAGRAM 4 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 11 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 ...

Page 4: ... 13 5A Single phase 3 wire grounded 1000 Watts full microwave power IEC705 2 450MHz 2M246 0 99min 99sec 20 W x 113 4 H x 143 4 D 131 4 W x 8 H x 141 2 D 38 lbs approx 41 lbs approx Touch Control System Clock 1 00 12 59 Microwave Power for Variable Cooking Power level HIGH Full power throughout the cooking time 9 Sauté approx 90 of Full power 8 Reheat approx 80 7 Med High approx 70 6 Medium approx ...

Page 5: ...r 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 fr...

Page 6: ...e 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 I...

Page 7: ...ch START 11 NUMBER Used to set for Time of day Cooking time Power level or Defrost weight 12 HOLD WARM Used to keep the food warm after the cooking is done 13 START One tap allows oven to begin functioning 14 DOOR OPEN BUTTON Press to open the door Opening the door during cooking will stop the oven 4 1 OPERATING INSTRUCTIONS Oven Front Plate Window Door Screen Door Seal Display Window Control Pane...

Page 8: ...This oven has a CHILD LOCK feature TO SET CHILD LOCK Touch the pad Touch and hold 0 pad LOCK appear on the display You can t input any key except 0 key TO CANCEL CHILD LOCK Touch the pad Touch and hold 0 pad LOCK disappears 4 Time Cooking 5 Multi Stage Cooking 6 Auto Weight Defrost 7 One Touch International Foods Cooking NOTE Heat only 1 package at a time 4 2 STOP CLEAR CLOCK STOP CLEAR TIME START...

Page 9: ... PINK RD RED BK BLACK WH WHITE CN 2 CN 1 PT 1 RY 1 RY 2 WH WH BL IMPORTANT SAFETY NOTE THE SHADED AREA ON THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION FIRE AND ELECTRICAL SHOCK HAZARDS WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURERS SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM NOTIC...

Page 10: ...venting 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 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 ...

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