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LG LMH1017CVB, Руководство по обслуживанию

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5-9

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 ONLY 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
TRANSFORMER
(Wire leads removed)

MAGNETRON
(Wire leads removed)

1. Measure the resistance.

(Select the ohm scale on the meter)
• Primary winding
• Secondary winding
• Filament winding

2. Measure the resistance.

(Select the ohm scale on the meter)
• Primary winding to ground
• Filament winding to ground

1. Measure the resistance. 

(Select the ohm scale on the meter)
• Filament terminal

2. Measure the resistance.

(Select the ohm scale on the meter)
• Filament to chassis

Approx.: 0.6 ~ 0.9 ohm
Approx.: 70 ~ 90 ohm
Less than: 1 ohm

Normal: Infinite
Normal: Infinite

Normal: Less than 1 ohm

Normal: Infinite

PRIMARY

TERMINAL

SECONDARY  

FILAMENT 
WINDING

Содержание LMH1017CVB

Страница 1: ... OVEN SERVICE MANUAL MODEL LMH1017CVW LMH1017CVB LMH1017CVST CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL P NO 3828W5S6006 May 2004 Printed in Korea Website http us lgservice com ...

Страница 2: ...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 interloc...

Страница 3: ... 1 OPERATING SEQUENCE 4 2 SCHEMATIC DIAGRAM 4 4 CIRCUIT DESCRIPTION 4 5 SERVICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS 5 1 MICROWAVE LEAKAGE TEST 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT 5 3 DISASSEMBLY AND ADJUSTMENT 5 3 INTERLOCK CONTINUITY TEST 5 8 COMPONENT TEST PROCEDURE 5 9 TROUBLE SHOOTING 5 13 EXPLODED VIEW 6 1 REPLACEMENT PARTS LIST 7 1 ...

Страница 4: ...ox 46 lbs approx Touch Control System Clock 1 00 12 59 Microwave Power for Variable Cooking Power level HIGH Full power throughout the cooking time 9 Saute approx 90 of Full power 8 Reheat approx 80 7 Med High approx 70 6 Medium approx 60 5 Med Low approx 50 4 Defrost approx 40 3 Low approx 30 2 Simmer approx 20 1 Warm approx 10 Convection 100 F and 225 F to 450 F Combination Owner s manual Glass ...

Страница 5: ... area Proper operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from...

Страница 6: ...echanical 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 on a sturdy and flat surface at least 5 cm 2 inches from the wall 7 Place the microwave oven as far away as possible from TV RADIO COMPUTER etc to prevent interference GROUNDING INSTR...

Страница 7: ... defrost food by weight 11 Q DEFROST This pad provides you with the rapid defrosting method for 1 0 pounds frozen foods 12 MORE Touch this pad to add ten seconds of cooking time each time you press it 13 LESS Touch this pad to subtract ten seconds of cooking time each time you press it 14 CUSTOM SET Touch this button to change the oven s default settings for sound clock scroll speed and Lbs kg 15 ...

Страница 8: ...EL CHILD LOCK Touch and hold 0 pad LOCKED disappear in the display 4 EZ ON 5 MORE LESS This pad is to be used as a temperature selection pad in convection mode and cook time adjustment pad in the microwave mode 6 CUSTOM SET You can select Sound Control Clock On Off Scroll Speed LBS F KG C Demo On Off and English Spanish To turn off the clock 7 TIMED COOKING 8 MULTI STAGE COOKING 1ST STAGE 2ND STAG...

Страница 9: ...Cook Reheat Select Recipe Categories Clear Convection Select Temperature Start Pause Clear Combi Roast Combi Bake Start Pause Cooking Time Cooking Time Start Pause Clear Auto Time Defrost Select Recipe Categories Enter the Weight Start Pause Clear Q Defrost Select Recipe Categories Start Pause Clear Auto Time Defrost Number Start Pause Clear Popcorn ...

Страница 10: ...L BL BK BN WH CONTROL MODULE 9 PIN CONNECTOR BK BL BN CHOKE FILTER Optional CAPACITOR H V DIODE MAGNETRON H V N L FAN YL RELAY MOTOR HEATER POWER RELAY MAIN WH THERMISTOR C M BK PRIMARY SWITCH MGT THERMOSTAT BN CIRC MOTOR RELAY BK RD BN BK CONVECTION HEATER CONVECTION MOTOR YL BL BK WH YL WH PK PK RY5 RY2 RY1 RY4 RY6 1 3 8 CN1 MAIN PCB 5 1 3 3 1 2 CN2 CN4 9 4 6 PK PK BN WH RD SENSOR 1 7 5 6 9 4 3 ...

Страница 11: ...gh 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 The micom controller controls the ON OFF time of relay 2 by the applied signal to vary the average output 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 pri...

Страница 12: ...ompliance If the oven operates with the door open the service personnel should Tell the user not to operate the oven Contact the manufacturer and CDRH Center for Devices and Radiological Health immediately NOTE Address on CDRH Office of Compliance HFZ 312 Center for Devices and Radiological Health 1390 Piccard Drive Rockville MD 20850 The service personnel should check all surface and vent opening...

Страница 13: ... The 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 of 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 ...

Страница 14: ... start of the test The initial temperature T1 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 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 T of 10 2 K is measured where...

Страница 15: ...cing the door be sure to check that the primary switch monitor switch and secondary switch operate normally 2 After replacing the door check for microwave energy leakage with a survey meter Microwave energy must be below the limit of 5 mW cm2 with a 275 ml water load 3 When mounting the door assembly to the oven assembly be sure to adjust the door assembly parallel to the chassis Also adjust so th...

Страница 16: ...es 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 around the magnetron Microwave energy must be below the limit of 5 mW cm2 With a 275 ml water load Make sure that gasket is r...

Страница 17: ...nnect the leadwire from magnetron and high voltage capacitor 3 Remove the screws holding the high voltage transformer to the baseplate J FAN MOTOR ASSEMBLY REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwires from fan motor fuse holder 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 ear...

Страница 18: ...e 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 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 hav...

Страница 19: ...sed 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 c...

Страница 20: ... PROCEDURE RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Select the ohm scale on the meter Primary winding Secondary winding Filament winding 2 Measure the resistance Select the ohm scale on the meter Primary winding to ground Filament winding to ground 1 Measure the resistance Select the ohm scale on the meter Filament terminal 2 Measure...

Страница 21: ...000 Terminal to case Measure the continuity Forward Ohm meter scale Rx10000 Measure the continuity Reverse Ohm meter scale Rx10000 Normal Momentarily indicates several ohms and then gradually returns to infinite Normal Infinite Normal Continuity Abnormal Infinite Normal Infinite Abnormal Continuity NOTE When testing the magnetron be sure to install the magnetron gasket in the correct position and ...

Страница 22: ...e R x 1 Measure the resistance Ohm meter scale R x 1 Check for continuity of the switch with a Multi meter Normal Abnormal 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 opera...

Страница 23: ...ale R x 1000 Measure the resistance Ohm meter scale R x 1000 Normal Approx 29 5 ohm Abnormal Infinite or several ohm Normal Approx 3 48 Kohm Abnormal Infinite or several ohm Normal Approx 2 93 Kohm Abnormal Infinite or several ohm Normal at room temperature 20 C 30 C Approx 255 Kohm RY 4 RY 2 Cooking Start OFF NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED ...

Страница 24: ...t inserted tightly Output power is too low Low AC input voltage Food temperature is too low Using metallic ware and allowing it to touch the oven wall Sparks occur Inconsistent intensity of microwave by their characteristics 1 Use plastic wrap or lid 2 Stir once or twice while cooking soup cocoa or milk etc Uneven cooking Ceramic ware trimmed in gold or silver powder is used Avoid using other elec...

Страница 25: ... does not turn on after setting cooking cycle 11 Display time of day does not reappear when cooking is finished TROUBLE 1 The following visual conditions indicate a probable defective control circuit CONDITION CHECK RESULT CAUSE REMEDY Everything works as specified Continuity No continuity Still have trouble Defective key membrane assembly Defective P C B assembly Loose connection Defective P C B ...

Страница 26: ...of primary switch with door opened Disconnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit Replace fuse Continuity Malfunction of secondary switch Replace fuse primary monitor secondary switches and RELAY RY2 of P C B Assembly No continuity Check continuity of secondary switch with door opened TROUBLE 2 Oven does not operate at all display...

Страница 27: ...eck continuity of primary switch Abnormal Abnormal Normal Defective fan motor Defective oven lamp Replace fan motor Replace oven lamp No continuity Continuity Defective primary switch Replace primary switch Loose connection Connect them tightly CONDITION CHECK RESULT CAUSE REMEDY Output is low Lower than 90 of rating voltage Normal Normal Abnormal Abnormal Measure the output power Disconnect the w...

Страница 28: ...capacitor Replace high voltage capacitor Check high vol tage capacitor Abnormal Defective magnetron Replace magnetron Check magnetron TROUBLE 5 No microwave oven operation even though oven lamp and fan motor run Display operates properly Output is full power when you set lower power level Abnormal Disconnect the wire leads from relay 2 and check continuity relay 2 Operate the unit Defective P C B ...

Страница 29: ...ay 4 or 6 of P C B assembly Check the convection heater element Abnormal Normal Defective Relay 4 or 6 Replace Relay 4 or 6 Abnormal Normal Defective convection heater Replace convection heater Check the circulation motor Abnormal Normal Defective circulation motor Replace circulation motor Check the damper motor Abnormal Normal Defective damper motor Replace damper motor Check the thermistor Erro...

Страница 30: ...CONTROL PANEL PARTS BASE PARTS PARTS INTERIOR PARTS OVEN CAVITY PARTS CONVECTION CHAMBER LATCH BOARD PARTS DOOR PARTS EXPLODED VIEW 6 1 INTRODUCTION MODEL NO LMH1017CVW LMH1017CVB LMH1017CVST ...

Страница 31: ...DOOR PARTS 6 2 13581A 13552A 13213A 14890A 13720D 13551A For Model LMH1017CVST 14026A 14970A 15006A ...

Страница 32: ...CONTROL PANEL PARTS 6 3 24781M 23506A 23572A 268711 WTP015 23551A For Model LMH1017CVST ...

Страница 33: ...OVEN CAVITY PARTS 6 4 WSZ094 33052M 36549S 34370T 35889A 33390G 33390M WTP013 35026G 33112U WTT021 WSZ185 WTT047 ...

Страница 34: ...LARCH BOARD PARTS 6 5 WSZ085 43501A 466001 43500A 466003 466001 44510A ...

Страница 35: ...4930W 55900A 35300S 56208A 53504A 55900N 54810S 56322A 33808A 55006F 54975G 55900C 54350S 56411A 50FZZA 36549C 54974S 56549F 56324A 50CZZH 54810C 56851D WSZ002 WTP004 WSZ002 WSZ002 WTT028 WMT002 WTT022 WTT021 WTT022 WWP008 WNH003 WWS005 WNH002 WSZ002 WSZ002 WTT037 WTT028 WSZ002 ...

Страница 36: ...BASE PLATE PARTS 6 7 63302A 56170D 63303A 948502 647781 WTT030 WSZ002 WTT021 ...

Страница 37: ...SENSOR PARTS 6 8 WTP002 56501A WTT021 54974T ...

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