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SERVICE

MICROWAVE OVEN

CONTENTS

MICROWAVE OVEN

1. Precaution

2. Specifications

3. Operating Instructions

4. Disassembly and Reassembly

5. Alignment and Adjustments

6. Troubleshooting

7. Exploded Views and Parts List

8. PCB Diagrams

9. Schematic Diagrams

Manual

MW1020WA

SEA

Содержание MW1020WA

Страница 1: ... MICROWAVE OVEN 1 Precaution 2 Specifications 3 Operating Instructions 4 Disassembly and Reassembly 5 Alignment and Adjustments 6 Troubleshooting 7 Exploded Views and Parts List 8 PCB Diagrams 9 Schematic Diagrams Manual MW1020WA SEA ...

Страница 2: ...s 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 s...

Страница 3: ...ould remove their watches while repairing an MWO 11 To avoid any possible radiation hazard replace parts in accordance with the wiring diagram Also use only the exact replacements for the following parts Primary and secondary interlock switches interlock monitor switch 12 If the fuse is blown by the Interlock Monitor Switch Replace all of the following at the same time Secondary door sensing switc...

Страница 4: ...he oven and discharge the high voltage capacitor See Figure 1 1 2 The high voltage capacitor remains charged about 30 seconds after disconnection Short the negative terminal of the high voltage capacitor to to the oven chassis Use a screwdriver 3 High voltage is maintained within specified limits by close tolerance safety related components and adjustments If the high voltage exceeds the specified...

Страница 5: ...SUMPTION OUTPUT POWER OPERATING FREQUENCY MAGNETRON COOLING METHOD OUTSIDE DIMENSIONS NET WEIGHT SHIPPING WEIGHT 99 MINUTES 99SECONDS 120V 60Hz AC MICROWAVE 1 400W 1000W 10 LEVEL POWER 2 450MHz OM75PH 31 ESS COOLING FAN MOTOR 2011 32 W x 1111 16 H x 1415 16 D 33 0 lbs 36 3 lbs ...

Страница 6: ...tructions 3 1 Control Panel 3 2 Features External Views Door Ventilation Holes Light Safety Interlock Holes Control Pane Open Door Push Button Guide Roller Glass Tray Door Latches CE1D33 517mm 369mm 297 mm 379 mm 216 mm ...

Страница 7: ...hat its antenna does not hit any adjacent parts or it may be damaged NOTE2 When replacing the magnetron be sure to remount the magnetron gasket in the correct position and make sure the gasket is in good condition 4 2 Replacement of High Voltage Transformer 1 Discharge the high voltage capacitor 2 Disconnect all the leads 3 Remove the mounting bolts 4 Reconnect the leads correctly and firmly PRECA...

Страница 8: ...n remove the door assembly 4 3 2 Removal of Door E Following the procedure as shown in the figure insert and bend a thin metal plate between Door E and Door A until you hear the tick sound 1 Insertion depth of the thin metal plate should be 0 5mm or less 4 3 3 Removal of Key Door Spring Remove pin hinge from Door E Detach spring from Door E and key door ٛ oor E Key Door Spring Door E Door A Door C...

Страница 9: ...heck if any other part such as the control circuit board blower motor or high voltage transformer is defective 4 5 Replacement of Drive Motor 1 Take out the glass tray guide roller from cavity 2 Turn the oven upside down to replace the drive motor 3 Remove a screw securing the drive motor cover or disconnect the drive motor cover from base plate by nipper 4 Disconnect all the lead wires from the d...

Страница 10: ... the Ass y control box 4 When reconnecting the FPC connector make sure that the holes on the connector are properly engaged with the hooks on the Plastic Fastener 4 6 3 Removal of Window Display Membrane Panel 1 Window display should not be disassembled as its mounting tabs will be broken If repair work is difficult replace with Ass y control panel 2 The membrane key board is attached to the escut...

Страница 11: ...from the circuit by disconnecting its leads 3 A continuity check across the magnetron filament terminals should indicate one ohm or less 4 A continuity check between each filament terminal and magnetron case should read open Primary Terminals Filament Terminals Secondary Terminal Magnetron Antenna Gasket Plate Cooling Fins PRECAUTION 1 High voltage is present at the high voltage terminals during a...

Страница 12: ... 2 No specific adjustment during installation of Primary switch Secondary switch and Monitor switch to the latch body is necessary 3 When mounting the Latch Body to the oven assembly adjust the Latch Body by moving it so that the oven door will not have any play in it Check for play in the door by pulling the door assembly Make sure that the latch keys move smoothly after adjustment is completed C...

Страница 13: ...y 3 seconds included as a holding time of magnetron oscillation 4 When heating is finished stir the water again with the thermometer and measure the temperature T2 5 Subtract T1 from T2 This will give you the water temperature rise T 6 The output power is obtained by the following formula Output Power 4 187 x 1000 x T 0 55xMcx T2 T0 44 Heating Time sec 41 41 Counting Time sec 4 187 Coefficient for...

Страница 14: ...n at the highest power level 4 Set survey meter dual ranges to 2 450MHz 5 Using the survey meter and spacer cone as described above measure near the opening of magnetron the surface of the air guide and the surface of the wave guide as shown in the following photo but avoid the high voltage components The reading should be less than 4mW cm 2 5 11 Note on Measurement 1 Do not exceed the limited sca...

Страница 15: ...n procedure Replace PCB main Timer starts countdown but no microwave oscillation No heat while oven lamp and fan motor turn on 1 Off alignment of latch switches 2 Open or loose connection of high voltage circuit especially magnetron filament circuit NOTE Large contact resistance will bring lower magnetron filament voltage and cause magnetron to lower output and or intermittent oscillation 3 Defect...

Страница 16: ...CB main Loud buzzing noise can be heard 1 Loose fan and fan motor 2 Loose screws on H V Transformer 3 Shorted H V Diode Tighten screws of fan motor Tighten screws of H V Transformer Replace H V Diode Turntable motor does not rotate 1 Open or loose wiring of turntable motor 2 Defective turntable motor Replace turntable motor Oven stops operation during cooking 1 Open or loose wiring of Secondary in...

Страница 17: ... Exploded Views MM01 MM22 MM16 MM07 MM03 MM13 MM29 MM30 MM31 MM14 MM18 MM19 MM20 MM27 MM28 MM06 MM17 MM08 MM10 MM09 MB01 MB05 MB03 MB08 MB04 MB02 MC01 MD01 MD07 MC05 MC04 MC02 MC03 MC06 MC07 MC13 MD10 MD06 MD05 MD04 MD11 MD02 MD03 MM34 MM55 ...

Страница 18: ...M75PH 31 ESS 1 MM09 DE71 60458A COVER AIR 3RD 1 0 1 3 MW5896W PP TB53 78g WHT 1 MM10 4713 001102 LAMP INCANDESCENT 125V 25W TRP 25x62mm 1 MM13 DE66 90113A LEVER DOOR PP TB53 GH41 T2 5 12g NTR 3RD W 1 MM14 DE26 00019B TRANS H V SHV 5594UC 1 120V 60HZ 2190V 3 30A H 1 MM16 DE71 00015A COVER CEILING CE2933 T0 3 W114 2 L121 5 CE2933 1 MM17 DE47 20032B THERMOSTAT PW2N 30 0 85 75 187 HORIZATAL 1 MM18 DE7...

Страница 19: ...5g 1 MC07 RA N2LED1 08 ASSY PCB PARTS MW850 1 MC13 DE94 00096G ASSY CONTROL PANEL MS1070WA XAA WHT ABS VE0812 1 MD01 ASSY DOOR MS1070WA S2 WHT BLK DOOR E NC 2000 1 S N A MD02 DE64 00132H DOOR A MS1070WA XAA ABS HG0760SR WHT 1 MD03 DE67 20187A SCREEN DOOR SAN T2 2 W377 L258 CLEAR 3RD 1 1 MD04 DE94 00075B ASSY DOOR E 3RD 1 0 BLK COATING 1 MD05 DE01 00118A FILM DOOR 1 MD06 DE64 40012A DOOR C RESIN PP...

Страница 20: ... SCREW A 2S 4X12 TOOTHED 2 CN BOX DE60 10082H SCREW A 2S 4X12 TOOTHED 1 CV AIR DE60 10082H SCREW A 2S 4X12 TOOTHED 2 MGT TCO DE60 10082H SCREW A 2S 4X12 TOOTHED 2 MO FAN DE60 10082H SCREW A 2S 4X12 TOOTHED 1 P C EA DE60 10082H SCREW A 2S 4X12 TOOTHED 3 PN OUT DE60 10082H SCREW A 2S 4X12 TOOTHED 1 S M EA DE60 10098A SCREW ASSY TAP TITE GLD SWRCH18A ZPC2 PH TC M4X8 WT 2 M DRIV DE60 10195A SCREW STAR...

Страница 21: ... 19 8 P C B Diagrams 8 1 P C B Diagrams ...

Страница 22: ...05 SOT 89 3P 185MIL PLASTIC 1 IC02 1405 000001 VARISTOR 470V 1250A 14x7 5mm TP 1 ZNR1 2007 000033 R CHIP 0OHM 5 1 8W DA TP 3216 4 J11 12 13 16 2007 000282 R CHIP 100KOHM 5 1 10W DA TP 2012 2 R27 28 2007 000300 R CHIP 10KOHM 5 1 10W DA TP 2012 3 R07 08 09 2007 000346 R CHIP 120OHM 5 1 8W DA TP 3216 8 R19 26 2007 000468 R CHIP 1KOHM 5 1 10W DA TP 2012 6 R01 03 05 10 13 2007 000671 R CHIP 2KOHM 5 1 1...

Страница 23: ...LEADS OR AS NOTED ON SPECIAL LEADS POWER MUST BE DISCONNECTED BEFORE SERVICING THIS APPLIANCE BLK BLU BLK RED RED RED RED WHT BLK RED WHT ORG ORG RED BLU BLU MAGNETRON HIGH VOLTAGE DIODE TO CHASSIS FA F HIGH VOLTAGE TRANSFORMER POWER RELAY DOOR SENSING SWITCH BOTTOM MONITOR SWITCH CENTER BLK WHT SECONDARY SWITCH TOP HIGH VOLTAGE CAPACITOR RED ORG WHT SYMBOL COLOR BLU BLK RED ORANGE WHITE BLUE BLAC...

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