MICROWAVE OVEN SERVICE MANUAL
Contents
1. Desired Desired Stop power level cooking time ind 5 MULTI STAGE MICROWAVE COOKING STAGE 1 Desired Desired Stop power level cooking time STAGE 2 Desired Desired power level cooking time Start Grill Desired or Combi cooking time 4 2 6 GRILL COOKING Stop gt Grill gt gt Start 7 COMBINATION COOKING Desired Se m oara Time 8 AUTO WEIGHT DEFROST Desired Desired Stop gt defrost cooking gt Start category Weight 9 CHILD LOCK This oven has a CHILD LOCK feature SET CHILD LOCK Touch the Stop pad e Touch STOP pad L appear in the display TO CANCEL CHILD LOCK Touch the Stop pad Touch STOP L disappears 10 AUTO COOK Desired Desired Stop 3 cooking gt Start category Weight SCHEMATIC DIAGRAM FOR MODEL MB 394A NolLdO N3L Tl4 340H9 NOHLJNOVN VOLEVEMPSBE ON LYVd sisspyo 0 jo yov a ybiy eanb6eu Bulsoys Aq Joyobdoy ae aozon Ubi y sbiBUSsIT ONIDIASSS 10038 aay ama Q3vO8 LINDYIO TOULNOD YIMOd NMOYA 3LIHM MOTIZA N3349 307102 IOSWAS 340 A009Z GAN3dO SI YOO LON SAV TAN2. 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
3. 9 for microwave cooking 4 GRILL Used to select the grill cooking 2 10 5 AUTO DEFROST Used to select the auto weight defrost 1 11 6 an COOK Used to cook the foods listed by one N 12 H une ES TIME To set cooking times 5 UA 8 STOP CLEAR Used to stop oven and clear all E entries except time of day 6 7 CHILD LOCK CORE 4E 9 DISPLAY WINDOW Cie Gam 10 KITCHEN TIMER 10 10cex 11 COMBI Used to select the combination cooking 12 MORE LESS Used to change cooking time 8 13 13 START One tap allows oven to begin functioning 4 1 OPERATING SEQUENCE The following is a description of component functions during oven operation 1 SETTING THE CLOCK Set Setth Touch Stop Ton holir bus Set the correct minute NOTE You can set 12 hour clock or 24 hour clock optionally 2 CANCEL FUNCTION Touch start Touch the STOP 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 3 QUICK START Stop Start 4 MICROWAVE COOKING
4. LG MICROWAVE OVEN MODEL MB 394A MH 594A CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL SPECIFICATIONS MODEL MB 394A MH 594A Power Requirement 230 Volts AC 50 Hz Single phase 3 wire grounded Microwave 1 200W 1 200W Grill 1 100W 1 100W Combination 2 250W 1 200W Power Output 800 Watts full microwave power IEC705 Microwave Frequency 2 450 MHz Magnetron 2M214 39F Timer 90 min Outside Dimensions 483 W x 285 H x 360 D mm Cavity Dimensions 312 W x 198 H x 316 D mm Net Weight 13 7 kg approx Shipping weight 15 1 kg approx Control Complement Microwave Power for Variable Cooking Power level Full power throughout the cooking time approx 80 of Full power MEDIUM approx 60 of Full power DEFROST approx 40 of Full power LOW WARM approx 20 of Full power Grill COMBI Name Plate Location BC Accessories Owner s manual Glass tray Rotating ring Grill rack This microwave oven is designed for household use only It is not recommended for commercial purposes OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Glass Tray Rotating Ring 1 INDICATORS 2 SET CLOCK Used to set the time of day 3 MICRO Used to select the desired power level 1
5. a d U dy a N8 HW AO HOLIMS N9 0 0935 9 0 78 110 119 NO IVINY3HL NJAO l aam 3Q0IQ A H YOLOW YOLOW TIAVLNYNL MOLIDVdVO AH BET VOL AOSZ uva Thug 1 100 112 TVINY3HL THES e Na UINYOJSNVAL HOLIMS UMOd INdNI 4 3 FOR MODEL MB 394AA VILEVEMPSBE ON LYVd puno4b sisspys 0 Jburuue ss ova ybiy Aq Joypobdo ANId y6iy y ONIDIAYIS 340438 monaj u au ma e NMOYa Na 3LIHM HM MOTI3A N33H9 A 9 40702 5 440 002 Q3N3dO SI 00071 310 YVO8 LINDYIO TOULNOD ONY Y3MOd SAVIN PS ZEN YUINYOISNVALAT IT y 17 N 5 6 110 119 NO IVNY3HL N3AO Q NOHL3NO VW r 33114 ASION 3Q0IQ A H YOLOM ta 22 e A m al es d TO an ag 5 TIO TU O NH YJINYJOISNVAL HOLIMS 3OVLIOA 1 A 9 4 4 4 CIRCUIT DESCRIPTION GENERAL DETAILS The low voltage transformer supplies the necessary voltage to the micom controller when power cord is plugged in When the door is closed the pri
6. f the magnetron WHEN THE OVENIS SET AT ANY LEVEL EXCEPT MAXIMUM The micom controller controls the ON OFF time of relay 2 by the applied signal to vary the average output 4 5 power of microwave oven as POWER LEVEL refer to page 1 1 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 ON OFF of relay 2 is coupled electrically with opening and closing of the secondary switch When the door is opened the secondary switch is 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 and relay 2 and or secondary 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 PRIMARYO FUSE SWITCH 1 H V 0 TRANS O FORMER MONITORO SWITCH d OTO SECONDARYD RELAY 1 Di SWITCH MICOM CONTROLLER YN WHEN TOUCHING THE START KEY WITH THE GRILL COOKING FUNCTION SELECTED The contacts of the primary switch 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 GRILLO THERMOSTATO Ye GRILLO HEATER RELAY 30 n
7. mary 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 The 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 PRIMARYO FUSE SWITCH E O H V 0 TRANS O FORMER RELAY 2 SECONDARYO 1 2 9 SWITCH MICOM CONTROLLER 0 o The fan motor rotates and cools the magnetron by blowing the air coming from the intake on the baseplate The 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 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 o
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