LG MA840B Service Manual

LG MA840B Manual

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  • LG MA840B | Service Manual - Page 1
    GoldStar Website http:llus.Igservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MA840B CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO 3828VV5S3748 April, 2004 Printed in Korea
  • LG MA840B | Service Manual - Page 2
    This device is to be serviced only by properly qualified service personnel. tisult the service manual for propeFsuiviewpreeee ntinued safety operation cid-fer-precautions to be taken to avoid possible-exposure to excessive-microwave-energy- - PRECAUTIONS DURING SERVICING TO AVOID POSSIBLE 't/
  • LG MA840B | Service Manual - Page 3
    SPECIFICATIONS AUT1 N INSTALLATIONS OPERATING INSTRUCTIONS URES CONTROL PANEL OPERATING SEQUENCE SCHEMATIC DIAGRAM (I) SCHEMATIC DIAGRAM (II) IRCUIT DESCRIPTION Inside front cover 1-1 2-1 3-1 4 1 4-1 4 1 1-2 4-3 4-4 4-5 TOOLS AND MFASURING INSTRUMFNTS 5 1 MICROWAVE LEAKAGE TEST 5-1 MEASUHEMENT
  • LG MA840B | Service Manual - Page 4
    . 50%, 4 (Defrost) approx. 40% 3 (Low) approx. 30%, 2 (Simmer) approx. 20% 1 (Warm) approx. 10% IM Back side Accessories Owner's manual & cooking guide Glass turntable Roller Rest This microwave oven is designed for household use only. It is not recommended for commercial purposes. 1-1
  • LG MA840B | Service Manual - Page 5
    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 FIN MAGNETRON CHASSIS GROUND MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED
  • LG MA840B | Service Manual - Page 6
    block the vent and the air intake openings Blocking vent of-air intake openings c damage to the oven and poor cooking results. ake auie the microwave legs are in place to -ensure-proper-air-flow 4. The oven should not be installed in any area where heat and steam are generatedTbecause they
  • LG MA840B | Service Manual - Page 7
    FEATURES OPERATING INSTRUCTIONS Oven Front Plate Window Door Screen Door Seal Display Window Control Panel CONTROL PANEL 2 %One Touch Control POPCORN POTATO BEVERAGE FRESH vEGFABLE FOOD PLATE FROZEN
  • LG MA840B | Service Manual - Page 8
    The following is a description of component oils dduiny oven operation. 1. SETTING THE CLOCK STOP/CLEAR CLOCK - 110' NUMBER -0- CLOCK ex.) To cat 1.30,touch number k ,[3), atit14-0-]. NOTE: 1) This a 12-hew-dock. 2) Cloc vill operate as long as power is applied to the oven. 2. CANCEL FUNCTION
  • LG MA840B | Service Manual - Page 9
  • LG MA840B | Service Manual - Page 10
    ell:EMIAVT DIAGROtRIM*Check the Rating Model No. (ADD Noise filter) NOTE* DOOR-IS OPEN r . RS. SENSING ELEMENT RC COMPENSATING ELEMENT . WIRE COLOR. ~ALOI WH WHITE BK ACK PK PINK GN GREEN
  • LG MA840B | Service Manual - Page 11
    612 E1311•EllN• • 6ffir_Tai- HEIMPINI. I1.47 - I•M izIiSomMmAIiIlEeRM=INIII mmismir m.milioutw illIMILO il k. I ALNI-k -h-.--P.. Emil MII =MEI ilinur il • 01.1.10101.1.101I I 'ILVITATir,AIVIllTFI • ISTIIIMMEMIntrial! P I [01.1.0ElMa ILTJMIN M.10 Fl.L.K.I.M -"CTU'ILTMITGRITT grigati,
  • LG MA840B | Service Manual - Page 12
    ) • 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, 2- of the excessive eaage The service personnel inch (5 cm) spacer pplied with the pro shou d instruct the owner not to use tie
  • LG MA840B | Service Manual - Page 13
    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
  • LG MA840B | Service Manual - Page 14
    , the load is immediately placed on the center of the turntable which is in thd lowest position and the microwave power switched on. • The time T for the temperature of the water to rise by a value u panel CAUTION: DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING (refer to page 2-1) 5-3
  • LG MA840B | Service Manual - Page 15
    oven frame assembly. if the door assembly is not mounted properly, microwaves may leak from the clearance between the door and the oven. Remove , and high voltage capacitor. 3) Remove the two screws holding the the suction guide ASS'Y to the oven cavity and remove the high voltage diode earth screw.
  • LG MA840B | Service Manual - Page 16
    be below the limit of 5 mW/cm2. (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. J. REMOVING THE TURNTABLE MOTOR 1) Remove
  • LG MA840B | Service Manual - Page 17
    PCB Sub Asm 0 L. INTERLOCK SYSTEM 1) IN 1ERLOCK MECHANISM The door-lock4nechanism-le-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-risulting from the_microwaveleakage. 2) MOUNTING OF THE
  • LG MA840B | Service Manual - Page 18
    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 1G-FA-G2 OR VP-532A-OF FOR MONITOR SW TCH TYPF NO S7M-V 16-FA-63 OR VP-533A-OF FOR SFCONDARY SWITCH Whcn the
  • LG MA840B | Service Manual - Page 19
    VOLTAGE CAPACITOR AND RFMOVING THF WIRF LFADS FROM THF PRIMARY WINDING OF THF 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 TI IE OVEN. HIGH VOLTAGE TRANSFORMER ire ieaas remuve FILAMENT WINDING
  • LG MA840B | Service Manual - Page 20
    COMPONENTS HIGH VOLTAGE CAPACITOR TEST PROCEDURE Antenna €, Gasket 0 Chassis RESULTS Filament 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. Measure the resistance. (Ohm-meter scale: Rx1000
  • LG MA840B | Service Manual - Page 21
    I I li! k:iTi!I3I*1 1:111.-ftf:Ii.-11:17/!ftl!IllTre: Wu17&InftI!ITATM1:1Rai I faTelThI!I h1:11; -?•!! r2•-!!!•P-MYYrei-!T! r-i•Li-na- • r -reT• E-3-!=-1-1 • a-U,L7I-1.r-l!Ta •••-!E-1 •N. o•-■ K ••mv• a M ElualA sivilimsavauiLamm renleMEMIWi • u IsI,MR.10W-WLIO I J .1 ea :11111T: = fffff
  • LG MA840B | Service Manual - Page 22
    INSTRUCT np in your ody. (Micnm model CONDITION Microwave oven Output power is too low microwave oven at adequate line voltage. si.-This may not be a defect. It is possible that the food should be cooked for tenger-time-per-led Du not use metallic ware_for- peaking except where in the cooking guide
  • LG MA840B | Service Manual - Page 23
    segniet . • Segment missing- • Partial-segmenWussing • Digit flickering (NOTE: Slight flIckerIngA normal.) Colon does not turn on or blink. 3. A distinct change in the brightnessof-one-or more numbers in display. 4 One or more digits in the display_ara_not lighting 5. Display does not count down
  • LG MA840B | Service Manual - Page 24
    -ff-ROUBLF-Py0vPm-does-nnt-epPrate a cepted. CONDITION CHECK 1. Fuse blows. H. - Check continuity of monitor switch (with door cioced) Rep f RESULT Continuity. No continuity CAUSE REMEDY I., Malfunction of the h o. Replace fuse, monitor switch. primary, monitor secondary switches, and
  • LG MA840B | Service Manual - Page 25
    • • program times are set and START pad is touched. 1 Setting time does not count -down when touching START Pad Check enntrnnity QLseconctary itch (with door closed) No continuity. y EMEDY s- Defective secondary switch. Replace ► secondary switch. -10-61 ec cction betwe -CN1 connector and
  • LG MA840B | Service Manual - Page 26
    (Display operates properly) CONDITION o microwave CHECK e leads from relay 2 and check continuity of re ay . RESULT Continuity CAUSE e 03C IVe REMEDY GP - CO Check high vol- Atniumidl normal 9 ge capacitor.
  • LG MA840B | Service Manual - Page 27
    INTRODUCTION EXPLODED VIEW a a O a rpe e e OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS 6-1
  • LG MA840B | Service Manual - Page 28
    #EV4 DOOR PARTS M M z 13552A 13213A 1 1353 o 14026A 14970A q..3721:* M M M M M M M M M 6-2
  • LG MA840B | Service Manual - Page 29
  • LG MA840B | Service Manual - Page 30
  • LG MA840B | Service Manual - Page 31
    LATCH BOARD PARTS *912B 055212)) .0' I 43500 0 46600') /- q6604 44510 WTT02) 0 (a 0 466001 6-5
  • LG MA840B | Service Manual - Page 32
    the rating label of Model and order SVC parts according to the Model No. * Check the * Check the Rating Model No. Rating Model No. 568771 * Check the Rating Model No. 56411 56930 •11D'' I OFZZ ev) CINrl D-OZ3 e 56549F *Z04 55900 03 * Check the Rating Model No. 54974S 5OCZZH 3 56324
  • LG MA840B | Service Manual - Page 33
    #EV# INTERIOR PARTS (II) Model: MA840B / 01 * Check the Rating Model No. 568771 Check the rating label of Model and order SVC parts according to the Model No. * Check the Rating Model No. OSZ00 56411A (69 ri eft * Check the Rating Model No. 56201A CWTIO2E) ' €54 *B04 55900 Ph 03 * Check the
  • LG MA840B | Service Manual - Page 34
    BASE PLATE PARTS 63303A 030* 561700 • INTT021 e *104 948501 6-8
  • LG MA840B | Service Manual - Page 35
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GoldStar
Website
http:llus.Igservice.com
MICROWAVE
OVEN
SERVICE
MANUAL
MODEL:
MA840B
CAUTION
BEFORE
SERVICING
THE
UNIT,
READ
THE
SAFETY
PRECAUTIONS
IN
THIS
MANUAL.
P/NO
3828VV5S3748
April,
2004
Printed
in
Korea