LG LRMM1430SB User Manual

MICROWAVE OVENSERVICE MANUALMODEL : LRMM1430SWLRMM1430SBCAUTIONBEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.website http://ww

7. OPERATING PROCEDURESA. CONTROL PANELFigure 5.-9-1. Display. The Display includes a clock and indicatorsthat tell you time of day, cooking time se

B. PANEL INSTRUCTIONS (Figure 5)The entire operation is done by simple touch control pads.(1) Display Window Numbers and letters explained in Figure

C. EASY USE CHART(1) CLOCK1. Touch STOP/CLEAR.2. Touch CLOCK.3. Touch numbers for correct time of day.4. Touch CLOCK.(2) “HI-POWER” COOKING1.

8. PROCEDURE FOR MEASURING MICROWAVEENERGY LEAKAGEA. CAUTIONS(1) Be sure to check a microwave emission prior toservicing the oven if the oven is ope

D. MEASUREMENT WITH A FULLY ASSEMBLED OVEN(1) After all components, including the outer panels, arefully assembled, measure for microwave energyleak

-14-9. DISASSEMBLY INSTRUCTIONSIMPORTANT NOTES:UNIT MUST BE DISCONNECTED FROM ELECTRICALOUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS,ADJUSTMENTS AND C

C. REMOVING CONTROL CIRCUIT BOARD (Figure 10)(1) Remove out case.(2) Remove door assembly.(3) Unfasten two screws.(4) Lift up and pull out contro

-16-E. AIR GUIDE REMOVAL (Figure 12)(1) Separate cavity and base plate.(2) Unfasten the screws which hold the air guide in thebase plate.(3) Unfas

-17-H. MAGNETRON REMOVAL(1) Disconnect the leadwire from the magnetron.(2) Carefully remove the mounting screws holding themagnetron at the waveguide.

J. FAN MOTOR ASSEMBLY REMOVAL(1) Separate cavity and base plate.(2) Remove air and suction guide..(3) Remove the two screws holding the fan motor ASSE

-1-CAUTIONWARNING TO SERVICE TECHNICIANSPRECAUTIONS TO BE OBSERVED BEFOREAND DURING SERVICING TO AVOIDPOSSIBLE EXPOSURE TO EXCESSIVEMICROWAVE ENERGYa.

-19-A. PRIMARY INTERLOCK SWITCH TESTWhen the door release button is depressed slowly withthe door closed, an audible click should be heard atthe same

-20-CAUTIONS1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASEFROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHA

-21-COMPONENTS TEST PROCEDURE RESULTSSENSORNormal: ApproximatelyBK-RD: 5.2 KohmsRD-WH: 2.1 KohmsBK-WH: 2.1 KohmsAbnormal: Infinite or several*Sensor c

-22-COMPONENTS TEST PROCEDURE RESULTSRELAYFAN MOTOR(Wire leads removed)TURNTABLEMOTOR(Wire leads removed)Check for continuity of relay with an ohm-met

-23-B. CHECKOUT PROCEDURES(1) CHECKOUT PROCEDURES FOR FUSE BLOWINGCAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE.Fuse blows immediately afterthe do

-24-(2) CHECKOUT PROCEDURES FOR RELAY - PROBLEM (A) -FAN motor and oven lamp turn on without touchingSTART key when the door is closed.Remove the mat

(3) CHECKOUT PROCEDURES FOR CIRCUIT BOARDThe following symptoms indicate a defective circuitboard.(1) Check the input current. If the input current

-26-C. TROUBLE SHOOTINGWHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THEFOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT

-27-1. Incomplete segments.• Segment missing.• Partial segment missing.• Digit flickering (NOTE: Slight flickering is normal.)2. Colon does not turn o

-28-CONDITION CHECK RESULT CAUSE REMEDY1. Fuse blows. Continuity.No continuity.Continuity.Shorted contact atthe primary switch.Replace fuse,primary, m

FOREWORDRead this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing yourself tothe Microwave Ene

-29-CONDITION CHECK RESULT CAUSE REMEDY1. Setting timedoes not countdown whentouching STARTpad.2. Fan motor oroven lamp donot turn on.No continuity.Co

-30-CONDITION CHECK RESULT CAUSE REMEDYNo microwaveoscillation.No continuity.Continuity.Defective PCBassembly.Replace PCBassembly.Disconnect thewire l

-31-INTRODUCTIONEXPLODED VIEW

-32-DOOR PARTS14970A14026AWTP00213806A13213A13552A13536A13581A268711WTP00223506A13551A15006A

-33-CONTROLLER PARTS268711WTP00223506A13551A

-34-OVEN CAVITY PARTS33112UWTT022 :Model LRMM 1430SW:Model LRMM 1430SBW10733390G35889AWSZ18536549SWTP01333052A13806F647781

-35-LATCH BOARD PARTSWSZ08543500A46600143501A466003466001

-36-OVEN INTERIOR PARTSWTT028WTT02154974T56501A56930V56912B43500A56324AWSZ002

-37-BASE PLATE PARTS35264A56877256877156549F56851H56201A50FZZA54980A43501A65006B63302AWTT021WTT028WTT034WSZ002268712WTT028WTT028WTT02855900A54974S5523

-38-REPLACEMENT PARTS LISTLOC.NO.*01 3828W5A3194 MANUAL,OWNERS R*02 3828W5S3066 MANUAL,SERVICE R*10 3890W3W376B BOX,WHITE R13213A 3213W0A008B DOOR FRA

-3-1. ADJUSTMENT PROCEDURESTo avoid possible exposure to microwave energyleakage, adjust the door latches and interlock switches,using the following

-39-LOC.NO.WTP002 1TPL0302018 SCREW TAPPING,PAN HEAD RWTP013 1TPL0402418 SCREW TAPPING,PAN HEAD RWTT021 1TTL0402418 SCREW TAPPING,TRUSS HEAD RWTT028 1

-40-LOC.NO.*01 3828W5A3340 MANUAL,OWNERS R*02 3828W5S3192 MANUAL,SERVICE R*10 3890W3W377A BOX,WHITE R13213A 3213W0A008C DOOR FRAME ASSEMBLY R13352A 33

-41-LOC.NO.WTP002 1TPL0302018 SCREW TAPPING,PAN HEAD RWTP013 1TPL0402418 SCREW TAPPING,PAN HEAD RWTT021 1TTL0402418 SCREW TAPPING,TRUSS HEAD RWTT022 1

-42-SCHEMATIC DIAGRAM OF P.C.B

-43-PRINTED CIRCUIT BOARDKEY PCBMAIN PCB

-44-P.C.B. PARTS LISTLOC. PART NO. DESCRIPTION SPECIFICATION SVC ALTERNO.AR1 0RZ1503G610 RESISTOR,DRAWING 150KOHM 1/4W 5% 3216 BULK 8 PIN

-45-LOC. PART NO. DESCRIPTION SPECIFICATION SVC ALTERNO.D61 0DD414809AA DIODE,SWITCHING 1N4148 ROHM TP26 DO35 100V 450MA 2A 3NS RD90 0DD4

-46-LOC. PART NO. DESCRIPTION SPECIFICATION SVC ALTERNO.R38 0RD5601G608 RESISTOR,FIXED CARBON FILM 5.6K OHM 1/4 W 5% TA26 RR39 0RD1002F608

P/NO : 3828W5S3066May, 2003Printed in Korea

-4-LATCH BOARDPRIMARYINTERLOCKSWITCHLATCHLATCH BOARD(A)(B)0-1/64"0-1/64"DOOR LATCHSECONDARYINTERLOCKSWITCHMONITORINTERLOCK SWITCH Figure 1

2. PRECAUTIONS ON INSTALLATION(Figure 2)A. Plug the power supply cord into a 120 V AC, 60 Hz,single-phase power source with a capacity of at least

SPECIFICATIONSRated Power Consumption 1250W maximum Output1200W maximum (*IEC 60705 Rating standard) Adjustable 0W through 1200W, 10 stepsFrequency 2,

6. OVERALL CIRCUIT DIAGRAMA. SCHEMATIC DIAGRAM-7-Figure 3

B. MATRIX CIRCUIT FOR TOUCH KEY BOARD-8-Figure 4