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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. Trouble

7. Exploded Views and Parts List

8. PCB Diagrams

9. Schematic Diagrams

Manual

MW1150WA

SEA

Содержание MW1150WA

Страница 1: ...ENTS MICROWAVE OVEN 1 Precaution 2 Specifications 3 Operating Instructions 4 Disassembly and Reassembly 5 Alignment and Adjustments 6 Trouble 7 Exploded Views and Parts List 8 PCB Diagrams 9 Schematic Diagrams Manual MW1150WA 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: ...d 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 switch a...

Страница 4: ...rate 1 3 Special High Voltage Precautions 1 High Voltage Warning Do not attempt to measure any of the high voltages this includes the filament voltage of the magnetron High voltage is present during any cook cycle Before touching any components or wiring always unplug the oven and discharge the high voltage capacitor See Figure 1 1 2 The high voltage capacitor remains charged about 30 seconds afte...

Страница 5: ...PTION OUTPUT POWER OPERATING FREQUENCY MAGNETRON COOLING METHOD OUTSIDE DIMENSIONS NET WEIGHT SHIPPING WEIGHT 99 MINUTES 99SECONDS 120V 60Hz AC MICROWAVE 1 550W FROM 110W 1100W 10 LEVEL POWER 2 450MHz OM75PH 31 ESS COOLING FAN MOTOR 2019 32 W x 1145 64 H x 164 1 D 33 lbs 36 lbs ...

Страница 6: ... Instructions 3 1 Control Panel 3 2 Features External Views Door Ventilation Holes Light Safety Interlock Holes Control Panel Open Door PushButton Guide Roller Glass Tray Door Latches 523mm 377mm 297mm 249mm 413mm ...

Страница 7: ... very carefully 6 Remove tow from the back panel of fan motor assembly 7 Take out the fan motor assembly 8 Remove the oven lamp by rotating to pull out from hole of air cover NOTE1 When removing the magnetron make sure that 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 sur...

Страница 8: ... 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 1mm or less 4 3 3 Removal of Key Door Spring Remove pin hinge from Door E Detach spring from Door E and key door Door E Key Door Spring Door E Door A Door C ...

Страница 9: ...eck 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 dr...

Страница 10: ...t board from 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 ...

Страница 11: ...n 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...

Страница 12: ...en mounting Primary switch and Interlock Monitor switch to Latch Body consult the figure 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 d...

Страница 13: ...s exactly 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 38 Heating Time sec 38 4 187 Coefficient for Water 1000 W...

Страница 14: ...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 12 Note on Measurement 1 Do not exceed the limited scale...

Страница 15: ...edure 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 Defective hi...

Страница 16: ... 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 inte...

Страница 17: ...iews MD06 MM01 MM22 MM102 MM16 MM07 MM03 MM13 MM29 MM30 MM31 MM14 MM18 MM19 MM20 MM27 MM28 MM132 MM55 MM34 MM06 MM17 MM08 MM10 MM09 MB01 MB05 MB03 MB08 MB04 MB02 MM171 MC01 MC05 MC04 MC02 MC03 MC07 MC13 MC06 MD01 MD02 MD10 MD07 MD04 MD11 MD05 MD03 ...

Страница 18: ... INCANDESCENT 125V 25W TRP 25x62mm 1 CV AIR MM102 DE63 00021A CUSHION HVT EPDM T10 5 W30 L50 MW6693G 1 MM13 DE66 90113A LEVER DOOR PP TB53 GH41 T2 5 12g NTR 3RD W 1 MM133 DE72 00177A GUIDE CAVITY PP TB53 T2 MW1255WA XAA NTR MM14 DE26 00061A TRANS H V SHV U11KA 120V 60HZ 2240V 3 6V H 1 MM16 DE71 60449A COVER MGT PP TB53 25G 110 5X115 GE WHT 3 1 MM17 DE47 20033A THERMOSTAT PW 2N 80 70 125V15A 250V7 ...

Страница 19: ...PARTS MW850 1 MC13 DE94 00426A ASSY CONTROL PANEL MW1250WA NC 12 P WHT M DESIGN 1 MD01 ASSY DOOR MW1250WA NC 12 WHT M DESIGN 1 S N A MD02 DE64 00186A DOOR A NC2000 2 ABS HR0370 P WHT 1 0CUFT 1 MD03 DE63 00042A SCREEN DOOR MW1250WA NC 12 PET T0 25 W196 L355 CLEAR 1 MD04 DE94 00428A ASSY DOOR E COATING MW1250WA NC 12 BLK 1 MD05 DE64 00248A FILM DOOR PE PC 178 5 306 T0 15 MW1250WA NC 12 1 MD06 DE64 0...

Страница 20: ...2S 4X12 TOOTHED 1 CV AIR DE60 10082H SCREW A 2S 4X12 TOOTHED 1 CVT 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 2 PN OUT DE60 10082H SCREW A 2S 4X12 TOOTHED 1 S M EA DE60 10082H SCREW A 2S 4X12 TOOTHED 1 TCO DE60 10098A SCREW ASSY TAP TITE PH TC M4X8 SWRCH18A ZPC2 GLD W 1 M DRIV DE60 10195A SCREW STAR POLE TH 2 4 ...

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

Страница 22: ...5 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 10...

Страница 23: ...SING SWITCH BOTTOM MONITOR SWITCH CENTER BLK WHT SECONDARY SWITCH TOP HIGH VOLTAGE CAPACITOR RED ORG WHT SYMBOL COLOR BLU BLK RED ORANGE WHITE BLUE BLACK WARNING NOTE CIRCUIT SHOWN WITH DOOR IS OPENED POSITION NOTE FOR SERVICE REPLACEMENT USE 16 GA 105 C THERMOPLASTIC COVERED WIRE EXCEPT FOR HIGH VOLTAGE LEADS OR AS NOTED ON SPECIAL LEADS POWER MUST BE DISCONNECTED BEFORE SERVICING THIS APPLIANCE ...

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