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4-6 Replacement of Control Circuit Board

4-6-1 Removal of Control Box Assembly

1. Disconnect the connectors from the control

box assembly.

2. Remove screws securing the control box

assembly.

3. Remove the knobs of the control box Ass'y.

4. Remove the screw securing the timer.

SCREWS

CONTROL BOX

Содержание M1813NR

Страница 1: ...ONTENTS 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 Schematic Diagrams Manual M1813NR SRSC ...

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: ...hould 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 Primary door sensing switch...

Страница 4: ...igure 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 limits check each of the special components PRECAUTIO...

Страница 5: ...QUENCY COOLING METHOD MAGNETRON OUTSIDE DIMENSIONS OVEN DIMENSIONS SHIPPING DIMENSIONS SHIPPING WEIGHT APPROX 35 MINUTES 230V 50Hz SINGLE PHASE 1 150W 100W 800W ICE 705 TEST PROCEDURE 2 450MHz COOLING FAN MOTOR OM75S 31 ESS 489 W x 275 H x 361 D 306 W x 211 H x 320 D 557 W x 329 H x 403 D NET 12 5kg GROSS 14 0kg ...

Страница 6: ...rnal Views VENTILATION HOLES LIGHT VARIABLE COOKING POWER CONTROL KNOB TIMER KNOB COUPLER DOOR DOOR LATCHES OPEN DOOR PUSH BUTTON SAFETY INTERLOCK HOLES ROLLER RING TURNTABLE 100 300 450 600 700 800W 0 1 2 3 4 5 6 7 8 10 15 20 25 30 35 275mm 206mm 361mm 489mm 342mm ...

Страница 7: ... 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 PRECAUTION Serviceme...

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 Door E Key Door Spring Door E Door A Door C ...

Страница 9: ...operate properly check 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 and coupler from cavity 2 Turn the oven upside down to replace the drive motor 3 Remove a screw securing the drive motor cover 4 Disconnect all the lead wires from the drive motor 5 Remove screws secur...

Страница 10: ...4 6 1 Removal of Control Box Assembly 1 Disconnect the connectors from the control box assembly 2 Remove screws securing the control box assembly 3 Remove the knobs of the control box Ass y 4 Remove the screw securing the timer SCREWS CONTROL BOX ...

Страница 11: ...k 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 any cook cycle 2 It is neither necessary nor advisable to attemp...

Страница 12: ...tch 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 Completely tighten the screws holding the Latch Body to the oven assembly 4 Reconnect to Monitor switch and check the continuity of the monitor circuit an...

Страница 13: ...edure will cause a variance in the temperature rise Additional power test should be made if temperature rise is marginal NOTE 2 Output power in watts is computed by multiplying the temperature rise step 5 by a factor of 91 times the of centigrade temperature 5 7 Microwave Heat Distribution Heat Evenness The microwave heat distribution can be checked indirectly by measuring the water temperature ri...

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 cm2 5 10 Note on Measurement 1 Do not exceed the limited scal...

Страница 15: ...ns secondary open the transformer may be faulty Replace H V Transformer Oven lamp does not light 1 Fuse blown out Check fuse Replace the fuse 2 Poor contact of power cord Check continuity of power supply cord Also check whether the power cord is securely wired Adjust or replace thepower supply cord 3 Defective lamp The fan motor rotates but lamp does not light Replace the lamp 4 Defective timer co...

Страница 16: ...well to the door hinge Fasten or tighten Timer does not operate 1 Defective timer motor If the timer does not operate with 21V applied to the terminals the timer motor amy be faulty Replace timer 2 Defective contacts of timer S W The lamp does not light Replace timer Cooking tray does not rotate 1 Defective drive motor Check to see if 21V exists at the motor terminals If so motor will be defective...

Страница 17: ...N and OFF repeatedly Replace or adjust 6 Open coil of H V Trans former Check the continuity of primary coil and secondary coil If there is no continuity H V Transformer is defective Replace the H V Transformer 7 Shorted H V capacitor Check the continuity of caacitor If the capacitor shorts the fuse blows Replace the H V Capacitor 8 Monitor fuse blown out Check the monitor fuse on the noise filter ...

Страница 18: ...s MD01 MD07 MD02 MD03 MD04 MD24 MD11 MD10 MD06 MD05 MC05 MC04 MC09 MC03 MC12 MC13 MC01 MC08 MM01 MM17 MM22 MM13 MM29 MM30 MM31 MM06 MM05 MM551 MM55 MM26 M M 1 7 MM08 MM09 MM07 MM03 MM18 MM19 MM20 MM32 MM10 MM88 MM14 MM27 MM28 MB01 MB05 MB03 MB04 MB02 MM16 ...

Страница 19: ...H41 T2 5 12g NT 1 MM14 DE26 00059A TRANS H V SHV E1713A 230V 50HZ 2130V 3 6 1 MM16 DE71 00151A COVER MGT MW850WA PP T2 W54 L129 GE WH 1 MM17 DE47 20173A THERMOSTAT PW 2N 90 60 30 187Y 250V7 5A 1 MM18 DE74 20102B TRAY COOKING GLASS T5 0 M745 1 MM19 DE97 00193B ASSY GUIDE ROLLER NC2000 0 6 T2 P1198 14 1 MM20 DE67 00140A COUPLER NC2000 0 6 0 8 PPS ESS840 3G 1 MM22 DE31 10154A MOTOR SYNCHRONOUS M2HJ49...

Страница 20: ...0mS 1 MC13 DE94 00401N ASSY CONTROL PANEL M1813NR BWT PURE WH 1 MD01 ASSY DOOR M1813NR M1833NR BWT PURE WHT C 1 S N A MD02 DE64 40322Y DOOR A ABS P WHT M1733R BWT TDS S 1 MD03 DE67 20186A SCREEN DOOR SAN T2 2 W354 L224 SMOG 3RD 1 MD04 DE92 50133C ASSY DOOR E MW4593G BLK 3RD 0 7 1 MD05 DE01 00112A FILM DOOR PET L268 T0 15 W150 NTR 1 MD06 DE64 40008B DOOR C PP T1 5 BLK CE745G 1 MD07 DE61 00198A SPRI...

Страница 21: ...2S SWRCH18A ZP2 PH PI5 L10 4 MGT DE60 10082H SCREW A 2S 4X12 TOOTHED 1 AIR COVER DE60 10082H SCREW A 2S 4X12 TOOTHED 2 B LATCH DE60 10082H SCREW A 2S 4X12 TOOTHED 3 B PLATE DE60 10082H SCREW A 2S 4X12 TOOTHED 1 C BLOWER DE60 10082H SCREW A 2S 4X12 TOOTHED 1 C BOX DE60 10082H SCREW A 2S 4X12 TOOTHED 4 O PANEL DE60 10098A SCREW ASSY TAP TITE GLD SWRCH18A ZPC2 PH TC M4X8 WT 1 D MOTOR DE60 30016A NUT ...

Страница 22: ...atic Diagrams 8 1 Schematic Diagrams MAGNETRON FA F RED RED RED RED SYMBOL COLOR BRN BROWN BLK BLACK RED RED BLU BLUE BLU BLU HIGH VOLTAGE TRANSFORMER HIGH VOLTAGE CAPACITOR HIGH VOLTAGE DIODE TO CHASSIS H V FUSE ...

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