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MICROWAVE OVEN SERVICE MANUAL - Page de test

1. Oven Front Plate Window Door Screen Door Seal Control Panel Safety Door Lock System Cook Tray Turntable Rotating Ring 1 INDICATORS 2 DIAL AUTO COOK Used to cook the foods listed by one touch AC NASA NEI LESS MORE Used to change cooking time RA dy WEIGHT Used to select the desired weight wen gt SET CLOCK Used to set the time of day ime Weight a 3 AUTO DEFROST Used to select the auto weight defrost 4 QUICK DEFROST Used to select the quick defrost 5 TEMPERATURE 6 MEMORY COOK Used to memory key for favorite cook 7 POWER Used to select the desired power level for cooking GRILL Used to select the grill cooking 8 COMBI Used to select the combination cooking 9 START One tap allows oven to begin functioning 10 STOP CLEAR Used to stop oven and clear all entries except time of day 4 1 OPERATING SEQUENCE The following is a description of component functions during oven operation 1 CANCEL FUNCTION pad whenever you need to cancel an entry or a function currently in use The display will either return to the last item entered or to the clock Touch the STOP 2 QUICK START Stop 3 Start 3 MICROWAVE COOKING Stop y Power gt Desired cooking time Start Desired cooking time Start 4 GRILL COOKING
2. 100V 450mA 2A D34 0DD414809AB DIODE 1N4148M ROHM TP26 100V 450mA 2A D35 0DD414809AB DIODE 1N4148M ROHM TP26 100V 450mA 2A DP1 ODLZZW5A01B LED TOF 3491HG B BK OASIS GREEN TOF 3491HG B R EN1 6024W5A0006 VOLUME ROTARY ALPS EC12E24204 R 0IKE780500A IC KEC KE7805 3SIP LIN R PT1 6170W2G011H TRANSFORMER POWER 230V 50HZ 12V LGECW 006H R Q01 0TR319809AA TRANSISTOR BIPOLARS KTC3198 TP KEC Y KTC1815 R Q02 0TR107009AE TRANSISTOR BIPOLARS KRA107M TO 92M KEC R Q03 0TR319809AA TRANSISTOR BIPOLARS KTC3198 TP KEC Y KTC1815 R R 9 1 SERVICE PARTS PART NO DESCRPTION SPECIFICATION OTR127009AA OTR127009AA OTR127009AA OTR127009AA OTR107009AD OTR105009AB OTR105009AB OTR105009AB OTR105009AB OTR105009AB OTR107009AE OTR107009AD 0RD1501F608 0RD1001G608 0RD1002F608 0RD1001F608 0RD1001F608 0RD1001F608 0RD4702F608 0RD4702F608 ORD2200F608 ORD2200F608 ORD2200F608 ORD2200F608 0RD1002F608 0RD1002F608 0RD1002F608 0RD1002F608 0RD4702F608 0RD4702F608 0RD4702F608 0RD1001F608 0RD1001F608 0RD0472G608 0RD0472G608 0RD0472G608 0RD0472G608 0RD0472G608 0RD4702F608 0RD4702F608 0RD4702F608 0RD4702F608 0RD4702F608 0RD4702F608 0RD4701F608 0RD1001F608 ORD2202F608 0RD1001F608 0RD3901F608 0RD1001F608 0RD1002F608 0RD1001F608 0RD3301G608 TRANSISTOR BIPOLARS TRANSISTOR BIPOLARS TRANSISTOR BIPOLARS TRANSISTOR BIPOLARS
3. Stop Grill gt cooking time Desired Start gt Desired cooking time Start 5 COMBI COOKING Stop gt Combi power level Desired Start Desired cooking time Start 6 AUTO WEIGHT DEFROST Stop Desired defrost category Desired cooking time Start 7 AUTO COOK Stop j Desired auto cook category Desired cooking weight Start 8 CHILD LOCK This oven has a CHILD LOCK feature SET CHILD LOCK e Touch Stop pad e Touch STOP L appear the display CANCEL CHILD LOCK e Touch the Stop pad touch STOP pad gt L disappears 9 MORE OR LESS COOKING Start AutoCook Start The DIAL knob to increase cooking time The cooking time will increase by 1 second for each turn of the dial 10 QUICK DEFROST Start Quick Defrost gt Start 11 MEMORY SETTING Custom Cook 1 Stop gt Power Custom Dial Cook 1 To restore your favorite cook when you cook use it by pressing the favorite cook key Press MEMORY 1 button FA 1 appears on
4. Loose Connect them PCB assembly POJMANY connection tightly 2 Some inputs Replace key Everything works Defective key Replace key cannot be membrane as specified membrane membrane programmed assembly and assembly assembly check operation 3 Display shows a Still have trouble Defective PCB Replace PCB number or figure assembly assembly different from one touched 4 Random programming when touching other pads 5 Display is fixed at some figure and can not accept any input 5 13 TROUBLE 2 Oven does not operate at all Display window does not display any figures and no input is accepted CONDITION CHECK RESULT CAUSE REMEDY Check continuity Malfunction of the Replace primary of monitor monitor switch and monitor switch with switches door closed Replace fuse No continuity Check continuity Continuity gt Shorted contactat Replace primary of primary the primary switch and monitor switch with switches door opened No continuity Disconnect one Defective high Replace high side of the wire lead connected from transformer to the high voltage capacitor and operate the unit Normal voltage capacitor voltage capacitor Fuse blows again gt Defective
5. ASS Y and take off the PCB SUB ASS Y 7 O Of e 0000 Oo 1 O L INTERLOCK SYSTEM 1 INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage 2 MOUNTING OF THE PRIMARY MONITOR SECONDARY SWITCHES TO THE LATCH BOARD 5 6 Latch Board Primary Interlock Switch Interlock Monitor Switch Secondary Interlock Switch 3 INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY Mount the latch board to the oven assembly Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed Tighten the mounting screw Check for play in the door by pushing the door release button Door movement should be less than 0 5 mm 1 64 inch Don t push the door release button while making adjustment Make sure that the latch moves smoothly after adjustment are completed and that the screws are tight Make sure the primary monitor and secondary switches operate properly by following the continuity test procedure CAUTION CHECK THE CORRECT POSITION MAGNETRON q D H V TRANSFORMER H V DIODE H
6. Contact the manufacturer The service personnel should check all surface and vent openings for microwave leakage Check for microwave leakage after every servicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 4 mW cm Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage 5 1 NECESSARY MEASURING INSTRUMENTS TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 Narda 8100 8200 Inch scale 600 cc non conductive material beaker glass or plastic inside diameter approx 8 5 31 2 in Cylindrical and made of borosilicate glass vessel max thickness 3 mm outside diameter approx 190mm height approx 90mm Glass thermometer 100 C or 212 F 1 deg scale MEASURING MICROWAVE ENERGY LEAKAGE e Pour 275 15cc of 20 5 68 9 F water in a beaker which is graduated to 600 cc and place the beaker on the center of the turntable Set the energy leakage monitor to 2 450 MHz and use it following the manufacturer s recommended test procedure to assure correct result When measuring the leakage always use the 2 inch 5cm spacer supplied with the probe Operate the oven at its maximum output Measure the microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured Move p
7. TRANSISTOR BIPOLARS TRANSISTOR BIPOLARS TRANSISTOR BIPOLARS TRANSISTOR BIPOLARS TRANSISTOR BIPOLARS TRANSISTOR BIPOLARS TRANSISTOR BIPOLARS TRANSISTOR BIPOLARS RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM KTA1270 Y KTA562TM TP KEC TPKEC KTA1270 Y 562 KEC KTA1270 Y KTA562TM TP KEC KTA1270 Y KTA562TM KRC 107M TP KEC KRC1
8. 3B73362A SWITCH MICRO 3B73362F SWITCH MICRO 3B73362E 3B73361E SWITCH MICRO 6600W1K004B 50FZZA 0CZZW1H002J 3B70856T CAPACITOR DRAWING HIGH VOLTAGE FUSE DRAWING 6120W3H002C 54810C 4810W3C004A BRACKET CAPACITOR 54811A 4811W2A017B BRACKET ASSEMBLY 549745 4974W1S057A GUIDE SUCTION GUIDE 54975G 4975W2S024V GUIDE ASSEMBLY SUCTION 55262A 5262W2A037B DUCT 55900A 2B72125A FAN SERVICE PARTS LOC NO PART NO DESCRIPTION VENDOR 56170D 56201A 6170W1D029C 6201W2A021E TRANSFORMER HIGH VOLTAGE FILTER ASSEMBLY CIRC 56324A 2B71732B MAGNETRON 56411A 6411W1A001G POWER CORD ASSY 56549F 6549W1F005A MOTOR CIRC FAN 6549W1F007A 56851D 6851W1A001A CABLE ASSEMBLY 568771 6877W1A341A HARNESS 56912B 6912W3B002D 6930WRT003B LAMP DRAWING THERMOSTAT 6930WRT004B 6930W1A001F THERMOSTAT 6930WRT001B 3302W1A026E BASE PLATE 3303W1A013K BASE PLATE ASSY 4B73900A LEG 3828W5A2130 MANUAL OWNERS MWO 3828 551990 MANUAL SERVICE 4850W4C001Q CUSHION 3B72244G CUSHION 3B72244T CUSHION 15BF0402418 4B70188C SCREW TAP TITE S BINDING HEAD SCREW DRAWING 4B70572D SCREW DRAWING 1TPLO302418 SCREW TAPPING PAN HEAD 1TPLO303018 SCREW TAPP
9. Check for P C B connector Cooking Start RELAY 2 RELAY 3 OF P C B Wire leads removed Note Relay Relay 1 Fan motor Turntable motor Oven lamp Relay 2 Microwave Relay 3 Grill Relay 2 Cooking Start FAN MOTOR Wire leads removed Measure the resistance Ohm meter scale R x 1 Normal Approx 200 400 ohm Approx 30 50 ohm Approx 300 500 ohm Abnormal Infinite or several ohm TURNTABLE MOTOR Wire leads removed Measure the resistance Ohm meter scale R x 1000 Normal Approx 10 20 kohm Abnormal Infinite or several ohm NOTE AMICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION WHEN REMOVING THE WIRE LEADS FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES 5 11 TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER EVALUATE THE COMPLAINT CAREFULLY IF THE FOLLOWING SYMPTOMS APPLY PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL CAUTIONS 1 Check grounding before checking for trouble 2 Be careful of the high voltage circuit 3 Discharge the high voltage capacitor See page 2 1 4 When checking the continuity of the switches or of the high voltage transformer disconnect one lead wire from these parts and then check continuity with the AC p
10. R89 R90 RY1 RY2 RY3 RY4 RY5 SW1 ORD1001F608 0RD3301G608 0RD1001F608 ORD5600F608 0RD1004F608 ORD5600F608 0RD1001F608 0RD1000F608 0RD1000F608 0RD1000F608 0RD1000F608 0RD1000F608 0RD1000F608 0RD1000F608 0RD1000F608 0RD1001F608 0RD1001F608 0RD1001F608 0RD1001F608 0RD1001F608 0RD1001G608 0RD1001G608 0RD4702F608 0RD4702F608 0RD4702F608 0RD4702F608 6920W2D010A 6920W2D010A 6920W2D010A 6920W5A012B 6920W5A012A 3Q60020A SW103Q60020A SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9 001 U10 201 3Q60020A 3Q60020A 3Q60020A 3Q60020A 3Q60020A 3Q60020A 3Q60020A 3Q60020A OIZZW5A104A 0155240200 0DZ510009AE RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RELAY RELAY RELAY RELAY RELAY SWITCH TACT SWITCH TACT SWITCH TACT SWITC
11. high volt age transformer Replace high volt age transformer NOTE All these switches must be replaced at the same time Refer to page 5 6 5 7 2 Fuse does not blow Defective mag netron thermostat of power supply cord No continuity Replace mag netron thermostat Check continuity No continuity of magnetron thermostat Continuity Check continuity gt 5 14 Defective power supply cord _ Replace power supply cord TROUBLE 3 Display shows all figures set but oven does not start cooking while desired program times are set and START pad is touched CONDITION CHECK RESULT CAUSE REMEDY NE Check continuity _ Defective Replace S of secondary secondary switch secondary switch when touching switch with START pad door closed L continuity Check the con nection between Defective P C B Replace P C B gt connector and assembly assembly P C B assembly Continuity Loose connection 1 men 2 Fan motor or Defective fan Replace fan oven la
12. the display Turn DIAL knob to decrease cooking time The cooking time will decrease by 1 second for each turn of the dial SCHEMATIC DIAGRAM NOYLANOVAN punoub sisspyd y jo 004191 anijpbau ayy buliuoys Aq 4 2 ybly y abroyos id ONIOIANSS 1401318 4OVL10A H9IH MO um ayvog lI0O3IO OYINOD HdMOd NOJ f 1E A YOSN3S al 1 AVIAN L ka 11 land AV133 H3MOd op s SFr sas I HOLIMS 235 Ta 17 HOLIMS TA ONINIS i safe IZAN rau 2022 Beeren REM L I I 30 09 gt 291 11 i s 1 4 AN3dO SI 1 LNO HOLIMS O Mil 212 Nd FM gt a ZHOS W ES _ TIN o KOG 2 8 O _ Sy Am 2212 5 2 2 2 O m 4 id m iz o 5 N r 1 STW z 4 1 2 O Nd Li l i 1 lt lt Q O 2 U Pane 1 53 I 3SION gt OVO 1 gt 2 os AE AV134 I
13. 05M KRC1205 TP KEG KRC105M KRC1205 TP KEG KRC105M KRC1205 TP KEG KRC105M KRC1205 TP KEG KRC105M KRC1205 TP KEG KRA107M TO 92M KEC KRC 107M TP KEC 1 5K OHM 1 6 W 5 00 TA26 1K OHM 1 4 W 5 00 TA26 10K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 220 OHM 1 6 W 5 00 TA26 220 OHM 1 6 W 5 00 TA26 220 OHM 1 6 W 5 00 TA26 220 OHM 1 6 W 5 00 TA26 10K OHM 1 6 W 5 00 TA26 10K OHM 1 6 W 5 00 TA26 10K OHM 1 6 W 5 00 TA26 10K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 47 OHM 1 4 W 5 00 TA26 47 OHM 1 4 W 5 00 TA26 47 OHM 1 4 W 5 00 TA26 47 OHM 1 4 W 5 00 TA26 47 OHM 1 4 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 4 7K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 22K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 3 9K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 10K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 3 3K OHM 1 4 W 5 00 TA26 9 2 UUNJJUJNJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJNUJJJJJJJJJTI SERVICE PARTS LOC NO PART NO DESCRPTION SPECIFICATION R42 R43 R50 R51 R55 R56 R57 R70 R71 R72 R73 R74 R75 R76 R77 R80 R81 R82 R83 R84 R85 R86 R87 R88
14. 13213A 3213W1A032L DOOR FRAME ASSY 13552A 3552W1A042A CHOKE COVER 13581A 3581W1A291B DOOR ASSEMBLY 136501 3650W2A029E HANDLE DOOR HANDLE 136502 3650W2A030A HANDLE DOOR HANDLE 13720D 3720W0D154H PANEL DOOR 14026A 4026W2A015A LATCH 14890A 4890W1A006V GLASS 14970A 4970WRA001C 5006W3A017A SPRING CAP CHOKE COVER 3572W0A178D CONTROL PANEL 3806W1A008B DECO CONTROL PANEL DECO 4781W1S070U CONTROLLER ASSEMBLY SEMI MICOM 4940W3A008B KNOB 5020W3A119K BUTTON 6871W2S226B PWB PCB ASSEMBLY MAIN 6871W2S227B PWB PCB ASSEMBLY KEY 3052W3M011C CANOPY MICA 3112W2U006F OUT CASE U BENDING 3390W1G012A TRAY GLASS 3390W1G010A 3550W3A094A COVER HEATER COVER 3808W1A001A COVER BACK COVER 4350W4A007H GASKET 3B72373A 4470W3A007A SHAFT TURN TABLE SHAFT GEAR 4470W3A008A GEAR 4810W2G053A BRACKET MWO 4810W3G130A BRACKET MWO 4B72944B HOLDER WIRE HOLDER 3035W1A004A REFLECTOR ASSY 5300W1S008D HEATER SHEATH 5889W2A005J ROTATING RING ASSEMBLY 6549WRS001H MOTOR CIRC SYNCHRONOUS 6549W1S003A MOTOR CIRC SYNCHRONOUS 6549W1S004A 6877W3A017C HARNESS 3500W1A005A BOARD LATCH BOARD 3501W1A016K BOARD ASSY LATCH 4510W4A005A LEVER
15. 3 a 950 YAWYOASNVY IWLSOWMSHL 4 3 CIRCUIT DESCRIPTION GENERAL DETAILS low voltage transformer supplies the necessary voltage to the micom controller when power cord is plugged in e When the door is closed the primary switch is ON the secondary switch is ON and the monitor switch opens contact COM and NO WHEN SELECTING COOKING POWER LEVEL AND TIME The micom controller memorizes the function you set time you set appears in the display window Each indicator light turns on to indicate that the stage has been set WHEN TOUCHING THE START PAD The coil of the relay is energized by the micom controller Power input is supplied to the high voltage transformer through the fuse to the primary switch and relay 2 Turntable rotates PRIMARY FUSE SWITCH 1 MONITOR x TRANS al SWITCH o FORMER 1 SECONDARY HELAYZ U jay WITCH l MICOM CONTROLLER 00 The fan motor rotates and cools the magnetron by blowing the air coming from the intake on the baseplate air is also directed into the oven to exhaust the vapor in the oven through the upper plate Cooking time starts counting down 3 2 volts AC is generated from the filament winding of the high voltage transformer This 3 2 volts is applied to the magnetron to heat the magnetron filament through two noise preventing choke coils high voltage of a
16. 5 220 4 25 2 The unit of CERAMIC CAPACITOR 18 pF BS H H gt m 229 22 1019 with built in bios resistor R80 m m 2 EL 5 PBS ANS 1K 5 842452 siwa a NSW 2 R126 R120 j rere JB KSF iz wam R127 R124 AAA 1 3 The unit of RESISTOR is ohm ond K 1000 M K K s wa s s w3 s w o BERR 4 The tronsistor in the hidden circle fine is tronsistor 8 1 PRINTED CIRCUIT BOARD P2 0226 656 5 MAIN 6870W2A226A LOC P C B PARTS LIST Ng PARTNO DESCRPTION SPECIFICATION Svc ALTER BLED ODLZW5A009D LED OASIS TOA B11CEYG B2 D BK YELLOW GREEN 1 R BZ1 6908W3YA01A BUZZER GPB B 26B2 SUNJIN 1ES EXTERNAL NONE R 01 0CK1040H518 CAPACITOR FIXED CERAMIC High dielectric 0 1UF D 25V 10 B Y5P TA26 R C02 0CE6871H618 CAPACITOR FIXED ELECTROLYTIC 680000000PF SM SA 25V 20 FLTP5 R C03 0CE6871H618 CAPACITOR FIXED ELECTROLYTIC 680000000PF SM SA 25V 20 FLTP5 R C05 0CK2230H518 CAPACITOR FIXED CERAMIC High dielectric 0 022UF D 25V 10 B Y5P TA26 R C07 0CK1040H518 CAPACITOR FIXED CERAMIC High dielectric 0 1UF D 25V 10 B Y5P TA26 R C08 0CE2272H638 CAPACITOR FIXED E
17. 5M002A RESONATOR CRYSTAL CSTS0400 MURATA 4MHZ 0 5 15PF TP NONE 001 000400209 DIODE RECTIFIERS 1N4002 PNONEC TP26 DONONE41 100V NONE 30 002 0DD400209AA DIODE RECTIFIERS 1N4002 PNONEC TP26 DONONE41 100V NONE 30 003 0DD400209AA DIODE RECTIFIERS 1N4002 PNONEC TP26 DONONE41 100V NONE 30 R 004 000400209 DIODE RECTIFIERS 1N4002 PNONEC TP26 DONONE41 100V NONE 30 005 0DD400209AA DIODE RECTIFIERS 1N4002 PNONEC TP26 DONONE41 100V NONE 30 R 006 0DD400209AA DIODE RECTIFIERS 1N4002 PNONEC TP26 DONONE41 100V NONE 30 R 007 000400209 DIODE RECTIFIERS 1N4002 PNONEC TP26 DONONE41 100V NONE 30 R 009 0DD400209AA DIODE RECTIFIERS 1N4002 PNONEC TP26 DONONE41 100V NONE 30 R D20 0DD414809AB DIODE 1N4148M ROHM TP26 100V 450mA 2A D21 0DD414809AB DIODE 1N4148M ROHM TP26 DONONE34 100V 450mA 2A D22 0DD414809AB DIODE 1N4148M ROHM TP26 100V 450mA 2A D23 0DD414809AB DIODE 1N4148M ROHM TP26 100V 450mA 2A D24 0DD414809AB DIODE 1N4148M ROHM TP26 100V 450mA 2A D25 0DD414809AB DIODE 1N4148M ROHM TP26 100V 450mA 2A D30 0DD414809AB DIODE 1N4148M ROHM TP26 100V 450mA 2A 031 000414809 DIODE 1N4148M ROHM TP26 100V 450mA 2A D32 0DD414809AB DIODE 1N4148M ROHM TP26 100V 450mA 2A D33 0DD414809AB DIODE 1N4148M ROHM TP26
18. EEPROM 2K UZ5 18S ROHM TP26 NONE 1 5V NONE NONE NO 23 U DU DdD DU DdD DU DU D D D D D U UD U U U I 6920W5A012A SERVICE PARTS August 2001 P NO 3828W5S1990 Printed in Korea
19. EXPLODED VIEW She d EO wi boski c k z taka 6 1 REPLACEMENT PARTS LIST a ee 7 1 SCHEMATIC DIAGRAM PC u 8 1 PRINTED CIRCUIT BOARD SGO una 8 2 POB PARTS LIST EDI INE DIESE 9 1 SPECIFICATIONS ITEM DESCRIPTION MODEL MH 657PL Power Requirement 230 Volts AC 50 Hz Single phase 3 wire grounded Microwave Gril Combination 1 300W 1 250W 2 500W Power Output 900 Watts full microwave power IEC60705 Microwave Frequency 2 450 MHz Magnetron 2M214 39F Timer 0 99 min Outside Dimensions 508 W x 303 H x 374 D mm Cavity Dimensions Net Weight 320 W x 233 H x 347 D mm 17 kg approx Shipping weight 19 kg approx Control Complement Microwave Power for Variable Cooking Power level Full power throughout the cooking time 900W approx 80 of Full power 720W MEDIUM DEFROST LOW WARM Grill COMBI approx 60 of Full power 540W approx 40 of Full power 360W approx 20 of Full power 180W Nameplate Location 27 Accessories Owner s manual amp Cook book Glass turntable Rotating ring Cook tray This microwave oven is designed for household use only is not recommended for commercial purposes CAUTIONS Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from danger in ordin
20. H TACT SWITCH TACT SWITCH TACT SWITCH TACT SWITCH TACT SWITCH TACT SWITCH TACT IC DRAWING IC SAMSUNG ELECTRONICS DIODE ZENERS 1K OHM 1 6 W 5 00 TA26 3 3K OHM 1 4 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 560 OHM 1 6 W 5 00 TA26 1M OHM 1 6 W 5 00 TA26 560 OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 100 OHM 1 6 W 5 00 26 100 OHM 1 6 W 5 00 26 100 OHM 1 6 W 5 00 26 100 OHM 1 6 W 5 00 TA26 100 OHM 1 6 W 5 00 26 100 OHM 1 6 W 5 00 26 100 OHM 1 6 W 5 00 26 100 OHM 1 6 W 5 00 26 1K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 1K OHM 1 6 W 5 00 TA26 1K OHM 1 4 W 5 00 TA26 1K OHM 1 4 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 47K OHM 1 6 W 5 00 TA26 OJ SS 112 OJ SS 112 0 55 112 9 3 LM ORIGNAL DC12V 16 7mA 720 Ohm LM ORIGNAL DC12V 16 7mA 720 Ohm LM ORIGNAL DC12V 16 7mA 720 Ohm G5G 1A DT1 LG 1 5MS OMRON DC12V 4 7mA 1 G5G 1A DT1 LG OMRON DC12V 41 7mA 250V 16 SKHV10910 G S ALPS NONE NONE UL CSA SKHV10910 G S ALPS NONE NONE UL CSA SKHV10910 G S ALPS NONE NONE UL CSA SKHV10910 G S ALPS NONE NONE UL CSA SKHV10910 G S ALPS NONE NONE UL CSA SKHV10910 G S ALPS NONE NONE UL CSA SKHV10910 G S ALPS NONE NONE UL CSA SKHV10910 G S ALPS NONE NONE UL CSA SKHV10910 G S ALPS NONE NONE UL CSA SKHV10910 G S ALPS NONE NONE UL CSA HD6433643RB89P 64SDIP BK CIS A WHEATER KS24C020 8P DIP BK
21. ING PAN HEAD 1 10402418 SCREW TAPPING PAN HEAD 1TTL0402416 SCREW TAPPING TRUSS HEAD WTT024 1TTL0402418 1TTL0402618 SCREW TAPPING TRUSS HEAD SCREW TAPPING TRUSS HEAD WTTO28 1TTL0402818 SCREW TAPPING TRUSS HEAD WTT030 1TTL0402818 SCREW TAPPING TRUSS HEAD WTT037 1TTL0403818 SCREW TAPPING TRUSS HEAD D d J D D D D U D U DD D BW D D U D D V D D A D U D D R SERVICE PARTS SCHEMATIC DIAGRAM OF P C B AC INPUT 220V 50 Sa C DTI LG RY4 1 5 ms 92085 0128 HEATER 1A DTI LG 6 ma RYS 920W5A012A POWER YW396 o3v 2volp Q i JE2O2A 1T 3 3 2 2 1 13 Q R70 77 ah 7 10 190 65004 a 12 AW 7 1 3e 13 Ps3 e DP1 e TOF 3491UG B vos m ho ODLZZW5A01B 16 AN P 4 3 4 i LALO s Go 0110 i 1270 220 1 811377 220 TYCO ee en 2 com2 1 com _ 3 2 1 BILDA 1 58 57 u m mszy h 5 9 8 050 031 vor R128 47 b 2 Dz CIOSM 8 USA R129 47 2 te 12 035 FIX 24 1d 1N4148 31 res Pes R130 47 4 3 Mak 1 1 cae m 333 5 NOTE 1 The unit of ELECTROLYTIC CAPACITOR is 220 2
22. LECTROLYTIC 220UF SME SQ 25V 20 FM5TP5 R C09 0CE1071D638 CAPACITOR FIXED ELECTROLYTIC 100UF SM SA 10 20 FM5TP5 R C102 0CK2230H518 CAPACITOR FIXED CERAMIC High dielectric 0 022UF D 25V 10 B Y5P TA26 R C103 0CK2230H518 CAPACITOR FIXED CERAMIC High dielectric 0 022UF D 25V 10 B Y5P TA26 R C20 0 2230 518 CAPACITOR FIXED CERAMIC High dielectric 0 022UF D 25V 10 B Y5P TA26 R C21 0CK2230H518 CAPACITOR FIXED CERAMIC High dielectric 0 022UF D 25V 10 B Y5P TA26 R C25 0 2230 518 CAPACITOR FIXED CERAMIC High dielectric 0 022UF D 25V 10 B Y5P TA26 R C40 0 2230 518 CAPACITOR FIXED CERAMIC High dielectric 0 022UF D 25V 10 B Y5P TA26 R C41 0 2230 518 CAPACITOR FIXED CERAMIC High dielectric 0 022UF D 25V 10 B Y5P TA26 R C50 0CE4761K638 CAPACITOR FIXED ELECTROLYTIC 47UF SM SA 50V 20 FM5 TP 5 R C80 0CK2210K518 CAPACITOR FIXED CERAMIC High dielectric 220PF D 50V 10 B Y5P TA26 R C81 0CK2210K518 CAPACITOR FIXED CERAMIC High dielectric 220PF D 50V 10 B Y5P TA26 R C82 0CK2210K518 CAPACITOR FIXED CERAMIC High dielectric 220PF D 50V 10 B Y5P TA26 R CN1 6630W5V012B CONNECTOR CIRC WAFER YW396 9AV 2 4 6 8VOID 9 3 96 VO R CN2 CQ52212A CONNECTOR CIRC WAFER YW396 03 42 VOID YEON HO 3 3 96 VOID R 6 CQ52194B CONNECTOR CIRC WAFER YW396 03VY YEON HO 3 3 96 W_YELLOW R CN8 6630W5V014C CONNECTOR CIRC WAFER 51580 YEONHO 18 1 25 WAFER R CR1 6212W
23. LG MICROWAVE OVEN MODEL MH 657PL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY A Do not operate or allow the oven to be operated with the door open B Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary 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 connections D Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner E A microwave leakage check to verify compl
24. SULT CAUSE REMEDY Disconnect the e Defective P C B Replace P C B gt No continuity gt gt wire leads from assembly assembly relay 2 and check continuity A of relay2 gt Continuity Operate the unit Check H V Defective high Replace high transformer voltage voltage transformer transformer normal Check H V ae Defective high Replace high capacitor voltage capacitor voltage capacitor normal Check H V Defective high Replace high diode 7 AQUA voltage Diode voltage Diode normal Check Defective Replace a gt Magnetron magnetron magnetron 5 16 TROUBLE 6 Oven does not cook properly when programmed for the set power level Operates properly on HIGH CONDITION CHECK RESULT CAUSE REMEDY Output is full when Disconnect the Abn rinal Defective P C B Replace P C B you set lower wire leads from assembly assembly power level relay 2 and check continuity relay 2 Operate the unit TROUBLE 7 Grill CONDITION CHECK RESULT CAUSE REMEDY 1 Heater is not Malfunction the operating Heater gt Abnormal heater Replace Normal Thermos
25. V CAPAQITOR K PRIMARY CIRCUIT PROTECTOR INTERLOCK CONTINUITY TEST WARNING FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS TYPE NO SZM V 16 FA 63 OR VP 533A OF FOR PRIMARY SWITCH TYPE NO SZM V 16 FA 62 OR VP 532A OF FOR MONITOR SWITCH TYPE NO SZM V 16 FA 63 OR VP 533A OF FOR SECONDARY SWITCH PRIMARY INTERLOCK SWITCH TEST When the door release button is depressed slowly with the door closed an audible click should be heard at the same time or successively at intervals When the button is released slowly the latches should activate the switches with an audible click If the latches do not activate the switches when the door is closed the switches should be a adjusted in accordance with the adjustment procedure Disconnect the wire lead from the primary switch Connect the onmmeter leads to the common COM and normally open NO terminal of the switch The meter should indicate an open circuit in the door open condition When the door is closed the meter should indicate a closed circuit When the primary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch COMPONENTS TEST PROCEDURE B SECONDARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary switch Connect the ohmmeter leads to the common COM and normally o
26. Y AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER SEE PAGE 2 1 2 ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN CONTAINER IN THE OVEN COMPONENTS TEST PROCEDURE RESULTS HIGH VOLTAGE FILAMENT TRANSFORMER WINDING Wire leads removed TERMINAL TERMINA WINDING 1 Measure the resistance Ohm meter scale Rx1 and Rx100 Approx 1 4 ohm Approx 90 ohm Less than 1 ohm e Primary winding Secondary winding Filament winding Measure the resistance Ohm meter scale Rx1000 Primary winding to ground Filament winding to ground Normal Infinite Normal Infinite MAGNETRON Wire leads removed Measure the resistance Ohm meter scale Rx1 Filament terminal Normal Less than 1 ohm Measure the resistance Ohm meter scale Rx1000 e Filament to chassis Normal Infinite COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket NOTE When testing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition HIGH VOLTAGE CAPACITOR Measure the resistance Ohm meter scale Rx1000 Terminal to terminal Normal Momentarily indicates several ohms and then gradually returns to infinite Measure the resistance Ohm meter scale Rx1000 Termi
27. ary use extreme care should be taken during repair DO NOT operate on a 2 wire extension cord during repair and use NEVER TOUCH any oven components wiring during operation BEFORE TOUCHING any parts of the oven always remove the power plug from the outlet For about 30 seconds after the oven stops an electric charge remains in the high voltage capacitor When replacing or checking you must discharge the high voltage capacitor by shorting across the two terminals with an insulated screwdriver DEAD 4 Gel Remove your watches whenever working close to or replacing the Magnetron NEVER operate the oven with no load NEVER injure the door seal and front plate of the oven cavity NEVER put iron tools on the magnetron NEVER put anything into the latch hole and the interlock switches area MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating device if it is improperly used or connection All input and output microwave connections waveguide flange and gasket must be secure never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized Proper operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity Never operate the magnetron unless it is
28. f the door keep the probe perpendicular to the surface making sure the probe horizontally along the oven surface this may possibly cause probe damage RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT After adjustment and repair of any microwave energy interruption or microwave energy blocking device record the measured values for future reference Also enter the information on the service invoice The microwave energy leakage should not be more than 4 mW cm sq after determining that all parts are in good condition functioning properly and genuine replacement parts which are listed in this manual have been used At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer MEASUREMENT OF MICROWAVE POWER OUTPUT Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of 1000 5 g of potable water The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190mm The oven and the empty vessel are at ambient temperature prior to the start of the test initial temperature 1 of the water is 10 2 C It is measured immediately before the water is added to the vessel After addition of the water to the vessel the load is immediately placed on the center
29. iance with the Federal Performance Standard should be performed on each oven prior to release to the owner CAUTION MICROWAVE RADIATION DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY CONTENTS Page SAFETY PRECAUTIONS Inside front cover SPECIFICATIONS sssssssssassasasnanassasanasanaasasnanasaa 1 1 A 2 1 INSTALLATIONS 3 1 OPERATING INSTRUCTIONS aaa a a 4 1 FEATURES mem ns ee 4 1 CONTROL PANELES ne ae 4 1 OPERATING SEQUENCFEE 0 ana 4 2 SCHEMATIC DIAGRAM Sea ae 4 4 CIRCUIT DESCRIPTION l et lts ne 4 5 SERVICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS conc cnn 5 1 MICROWAVE LEAKAGE TEST nennen nt 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT 5 3 DISASSEMBLY AND ernsten 5 3 INTERLOCK CONTINUITY TEST is 5 7 COMPONENT TEST PROCEDURE rene 5 8 TROUBLE SHOOTING aan ea ne 5 12
30. ir aluminum foil characteristics 2 Use plastic wrap or lid 3 Stir once or twice while cooking soup cocoa or milk etc 5 12 TROUBLE 1 The following visual conditions indicate a probable defective control circuit 1 Incomplete segments Segment missing Partial segment missing Digit flickering NOTE Slight flickering is normal Colon does not turn on or blink A distinct change in the brightness of one or more numbers in display One or more digits in the display are not lighting Specific numbers for example 7 or 9 will not display when key pad is touched Display does not count down with time blinking or up with clock operation Display obviously jumps in time while counting down 2 3 4 5 Display indicates a number different from one touched for example key in 5 and 3 appears in the display 6 7 8 9 Display counts down too fast while cooking 10 Each indicator light does not turn on after setting cooking cycle 11 Display time of day does not reappear when cooking is finished 12 Beep sound is not heard when correct key is touched CONDITION CHECK RESULT CAUSE REMEDY 1 No input can be Check the conn Continuit Defective PCB Replace PCB programmed ection between assembly assembly membrane key assembly and
31. lug removed do otherwise may result in a false reading or damage to your meter 5 Do not touch any part of the circuitry on the digital programmer circuit since static electric discharge may damage this control panel Always touch yourself ground while working on this panel to discharge any static charge built up in your body CONDITION CAUSE REMEDY Microwave oven Inserting many plug into one Avoid using other electrical does not work plug outlet and using appliances when you use the them at the same time microwave oven causes overloading Microwave oven plug is not Insert microwave oven plug inserted tightly securely Output power is too low gt Low AC input voltage Use the microwave oven at adequate line voltage Food temperature is too low This may not be a defect It is possible that the food should be cooked for a longer time period Sparks occurring Using metallic ware and gt Do not use metallic ware for allowing it to touch the oven cooking except where noted wall in the cooking guide Ceramic ware trimmed in Do not use any type of gold or silver powder is used cookware with metallic trimming Uneven cooking gt Inconsistent intensity of __ 1 Wrap the thinner part with microwave by the
32. move the two screws holding the the suction guide ASS Y to the oven cavity and remove the high voltage diode earth screw 4 Remove the screw of the capacitor bracket 5 Remove the two screws holding the fan motor ASS Y to the suction guide ASS Y G HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from fan motor noise filter and high voltage capacitor 3 Remove the screw holding the suction guide ASS Y to the oven cavity and remove the high voltage diode earth screw 4 Remove the screw holding the high voltage capacitor bracket Fan Motor ASS Y Suction Guide H V Capacitor H AIR DUCT ASSEMBLY REMOVAL 1 Disconnect the leadwire from lamp and MGT thermostat 2 Remove the mounting screw to the magnetron I MAGNETRON REMOVAL 1 Disconnect the leadwire from the high voltage transformer and high voltage capacitor 2 Carefully remove the mounting screws holding the magnetron and the waveguide 3 Remove the magnetron ASS Y until the tube is clear from the waveguide NOTE 1 When removing the magnetron make sure its dome does not hit any adjacent parts or it may be damaged 2 When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition 3 After replacing the magnetron check for microwave leakage with a survey meter arou
33. mp Check fan motor Abnormal motor do not turn on Defective fan Replace fan Check oven lamp Abnormal motor motor Normal TROUBLE 4 Oven seems to be operation but little heat is produced in oven load CONDITION CHECK RESULT CAUSE REMEDY Outputis low Check the Lower than 90 of Decrease in power _ Suggest customer power source rating voltage source voltage contact local voltage with load electric power gt Normal ulity bo or qualified electrician Disconnect the wire leads from Defective P C B Replace P C B relay 2 and check 17 Abnormal assembly assembly on and off time with multitester gt Measure the Defective Replace gt output power magnetron magnetron NOTE Simple test of power output conducted by heating one liter water for one min if available 5 15 TROUBLE 5 No microwave oscillation even though oven lamp and fan motor run Display operates properly CONDITION No microwave oscillation CHECK RE
34. nal to case Normal Infinite HIGH VOLTAGE DIODE NOTE Some inexpensive meters may indicate infinite resistance in both direction Measure the continuity Forward Ohm meter scale Rx10000 Normal Continuity Abnormal Infinite Measure the continuity Reverse Ohm meter scale Rx10000 Normal Infinite Abnormal Continuity COMPONENTS TEST PROCEDURE RESULTS FUSE Check for continuity of the fuse with an Normal Abnormal multi meter NOTE If the fuse is blown check the primary the secondary and the monitor switches H V D and H V C before replacing the fuse If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time Replace just the fuse if the switches operate normally HEATER ELEMENT Measure the resistance Normal Multi meter scale Rx1 Grill heater Approx 38 ohm 40 a Measure the resistance with 500V 100M ohm insulation resistance meter Normal more than 0 5 Mohm EN NOTE Make sure heater is fully cooled when tested 0 C Approx 90 lt Approx 90 C o OVEN THERMOSTAT Wire leads removed GRILL THERMOSTAT MAGNETRON 0 C Approx 145 C Approx 145 C THERMOSTAT O zur COMPONENTS TEST PROCEDURE RESULTS Disconnect the 8 pin connector from P C B Refer to schemetic diagram
35. nd the magnetron Microwave energy must be below the limit of 5 mW cm With a 275 ml water load Make sure that gasket is rigidly attached to the magnetron To prevent microwave leakage tighten the mounting screws properly making sure there is no gap between the waveguide and the magnetron Magnetron Y Waveguide Dome Waveguide Bracket Magnetron Gasket Magnetron 5 5 J REMOVING THE TURNTABLE MOTOR 1 Remove the turntable 2 Remove the turntable shaft VERY CAREFULLY with a slotted screwdriver 3 Lay the unit down on its back 4 Remove the turntable motor cover The turntable base cover is easily removed by pinching the six parts with a wire cutting 5 Disconnect the leadwire from the turntable motor terminals 6 Remove the screw securing the turntable motor to the oven cavity ASS Y 7 After repairing the motor rotate the removed turntable motor cover 8 Fit the turntable motor cover s projecting part to the base plate slit NOTE 1 Remove the wire lead from the turntable motor VERY CAREFULLY 2 Be sure to grasp the connector not the wires when removing w Turntable Motor K PCB ASSEMBLY REMOVAL 1 Remove the control panel assembly from the cavity Refer to control panel assembly removal on previous page 2 Remove screws which hold the PCB SUB ASS Y to the control panel 3 Disconnect the flat cable from the PCB SUB
36. of the turntable which is in the lowest position and the microwave power switched on The time T for the temperature of the water to rise by a value AT of 10 2 K is measured where T is the time in seconds and AT is the temperature rise The initial and final water temperatures are selected so that the maximum difference between the final water temperature and the ambient temperature is 5 microwave power output P in watts is calculated from the following formula 4187 x AT T is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included about 3 sec The water is stirred to equalize temperature throughout the vessel prior to measuring the final water temperature Stirring devices and measuring instruments are selected in order to minimize addition or removal of heat P WATER LOAD TURNTABLE DISASSEMBLY AND ADJUSTMENT A OUTER CASE REMOVAL 1 Disconnect the power supply cord from the outlet 2 Remove the screws from the rear and along side edges of the case The outer case must be moved backward to be lifted off B POWER SUPPLY CORD 1 Remove the outer case 2 Disconnect two terminals and remove one screw of the earth terminal CAUTION DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING refer to page 2 1 5 3 C CONTROL PANEL ASSEMBLY 1 Disconnect the leadwire from the PCB SUB ASS Y 2 Remove
37. pen NO terminals of the switch The meter should indicate a open circuit in the door open condition When the door is closed meter should indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the switch The meter should indicate closed circuit in the door open condition When the door is closed meter should indicate an open circuit When the monitor switch operation is abnormal replace with the same type of switch NOTE After repairing the door or the interlock system it is necessary to do this continuity test before operating the oven RESULTS SWITCHES Wire leads removed Check for continuity of the switch with an Ohm meter Door open Door closed Primary Switch AE 23 Monitor Switch Switch NO No I BEN cS NOTE After checking for the continuity of switches make sure that are connected correctly 5 7 COMPONENT TEST PROCEDURE CAUTIONS 1 DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT PROCEED WITH THE TEST ONL
38. pproximately 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 micom controller controls the ON OFF time of relay 2 by the applied signal to vary the average output 4 4 power of microwave oven as POWER LEVEL refer to page 1 1 One complete cycle of relay 2 is 22 seconds WHEN THE DOOR IS OPENED DURING COOKING Both the primary switch and relay 2 are cut off primary winding voltage of the high voltage transformer e ON OFF of relay 2 is coupled electrically with opening and closing of the secondary switch When the door is opened the secondary switch 15 opened and when the door is closed the secondary switch is closed The cooking time stops counting down Relay stops functioning As the door is opened if the contact of primary switch fails to open the fuse opens due to the large current surge caused by the monitor switch activation which in turn stops magnetron oscillation PRIMARY SWITCH 7 MONITOR Y TAKE 5 SWITCH 4 FORMER rd SECONDARY 9 SWITCH 1 MICOM CONTROLLER YN WHEN TOUCHING THE START KEY WITH THE GRILL COOKING FUNCTION SELECTED contacts of the primary swi
39. properly installed sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron ANTENNA FILAMENT TERMINALS MAGNETRON CHASSIS GROUND MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL 2 1 INSTALLATIONS BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY INSTALLING 1 Empty the microwave oven and clean inside it with a soft damp cloth Check for damage such as misaligned door damage around the door or dents inside the cavity or on the exterior 2 Put the oven on a counter table or shelf that is strong enough to hold the oven and the food and utensils you put in it The control panel side of the oven is the heavy side Use care when handling 3 Do not block the vent and the air intake openings Blocking vent or air intake openings can cause damage to the oven and poor cooking results Make sure the microwave oven legs are in place to ensure proper air flow 4 The oven should not be installed in any area where heat and steam are generated because they may damage the electronic or mechanical parts of the unit Do not install the oven next to a conventional surface 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 sturdy and flat surface at least 10 cm 4 inche
40. robe along shaded area Probe scanning speed Less than 2 5 cm sec 1in sec MEASUREMENT WITH OUTER CASE REMOVED When you replace the magnetron measure for microwave energy leakage before the outer case is installed and after all necessary components are replaced or adjusted Special care should be taken in measuring the following parts Circled area of below Fig Around the magnetron The waveguide WARNING AVOID CONTACTING ANY HIGH VOLTAGE PARTS MEASUREMENT WITH A FULLY ASSEMBLED OVEN After all components including the outer case are fully assembled measure for microwave energy leakage around the door viewing window the exhaust opening and air inlet openings Microwave energy leakage must exceed the values prescribed below NOTE Leakage with the outer case removedless than 5 mW cm sq Leakage for a fully assembled oven Before the latch switch primary is interrupted with the door in a slightly opened position less than 2 mW cm sq 5 2 NOTES WHEN MEASURING Do not exceed meter full scale deflection The test probe must be removed no faster than 1 inch sec 2 5 cm sec along the shaded area otherwise a false reading may result test probe must be held with the grip portion of the handle A false reading may result if the operator s hand is between the handle and the probe When testing near a corner o
41. s from the wall 7 Place the microwave oven as far away as possible from TV RADIO COMPUTER etc to prevent interference 8 Do not touch the front glass during or after cooking of the Grill and Combination mode This glass is very hot during heater operating 9 Do not operate the oven at microwave and combination mode with Grill rack placed in the cavity when the oven is empty 10cm 3 1 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 The wires in this mains lead are colored in accordance with the following code Green and yellow Earth Blue Neutral Brown Live As the colors of the wires in the mains lead of this appliance may not correspond with the colored markings identifying the terminals in your plug proceed as follows The wire which is colored green and yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol or colored green or green and yellow The wire which is colored blue must be connected to the terminal in the plug which is marked with the letter N or colored black The wire which is colored brown must be connected to the terminal in the plug which is marked with the letter L or colored red OPERATING INSTRUCTIONS
42. tat and Malfunction the relay3 Grill NG SOKU thermostat Normal SZ Replace or Wire connection No continuity Open or loosen connect tightly 1 Lower tempera Malfunction the ture the oven Heater NSE heater Replace Normal Thermostat and Malfunction the relay3 Grill Abnormal thermostat NOTE Make sure the wore leads correct position When removing the wire leads from parts be sure to grasp the connector not the wires When removing the magnetron be sure to install the magnetron gasket in the correct position and in good condition 5 17 EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS LATCH BOARD PARTS DOOR PARTS CONTROL PANEL PARTS 6 1 DOOR PARTS 6 2 CONTROL PANEL PARTS 6 3 OVEN CAVITY PARTS 6 4 LATCH BOARD PARTS Q gt gt INTERIOR PARTS E h 977 Z Qu Z N N N A G2 eK lt X _ 0 4 7 7 3 c e 0 0 va 6 6 BASE PLATE PARTS 6 7 LOC NO PART NO DESCRIPTION REPLACEMENT PARTS LIST VENDOR
43. tch and the secondary switch close the circuit A C voltage is applied to the grill heater through grill thermostat as shown by the solid line GRILL THERMOSTAT O Turntable rotates The fan motor rotates The air is also directed into the oven to exhaust the vapor in the oven through the base plate and upper plate SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS Tools normally used for TV servicing are sufficient Standard tools are listed below Diagonal pliers Long nose pliers e Phillips screwdriver Flat blade screwdriver e Wrench size 5mm Nutdriver size 5mm Adjustable wrench Soldering iron Solder Vinyl insulation tape Polishing cloth MICROWAVE LEAKAGE TEST CAUTIONS Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing The service personnel should inform the manufacture importer or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW cm and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance the oven operates with the door open the service personnel should Tell the user not to operate the oven
44. the screws for the earth and securing the control panel 3 Lift control panel ASS Y from the oven by the tab unhooked D DOOR GROSS ASSEMBLY REMOVAL 1 Open the door 2 Remove the choke cover very carefully with a blade screwdriver CAUTION Be careful not to damage door seal plate by screwdriver 3 Lift up and push the door flat NOTE 1 After replacing the door be sure to check that the primary switch monitor switch and secondary switch operate normally After replacing the door check for microwave energy leakage with a survey meter Microwave energy must be below the limit of 5 mW cm with a 275 ml water load When mounting the door assembly to the oven assembly be sure to adjust the door assembly parallel to the chassis Also adjust so the door has no play between the inner door surface and oven frame assembly If the door assembly is not mounted properly microwaves may leak from the clearance between the door and the oven w Remove choke cover E HIGH VOLTAGE TRANSFORMER REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from magnetron high voltage transformer and capacitor 3 Remove the screw holding the high voltage transformer to the baseplate 5 4 F FAN MOTOR ASSEMBLY REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from fan motor noise filter and high voltage capacitor 3 Re

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