GE MV1526B manual

MICROWAVE OVEN SERVICE MANUAL MODEL: MV1526W CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MV1526B website http://www.lgservice.com e-mail http://www.lgeservice.com/techsup.html[...]

CAUTION SAFETY PRECAUTIONS PRECAUTIONS T O BE OBSER VED BEFORE AND DURING SER VICING T O A VOID POSSIBLE EXPOSURE T O EXCESSIVE MICROW A VE 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 [...]

FOREWORD Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity. T ABLE OF CONTENTS (Page) SAFETY PRECAUTIONS ......................................................................................................... [...]

1-1 Rated Power Consumption ..................................................1,500W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output................................................................. 1,000W (IEC 60705) Adjustable 100W through 1000W, 10 steps Frequency ..........................................................[...]

2-1 CAUTIONS • DO NOT operate on a 2-wire extension cord during repair and use. • NEVER TOUCH any oven components or 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 repla[...]

3-1 INST ALLA TION PRECAUTIONS ON INST ALLA TION A. Plug the power supply cord into a 120V AC, 60Hz, single-phase power source with a capacity of 15A or 20A. B. Avoid placing the unit in a location where there is direct heat or splashing water. C. Install the unit on the mounting plate firmly. D. Place the unit as far away as possible from TV, radi[...]

CONTROL P ANEL 4-1 OPERA TING INSTRUCTIONS 1 2 4 7 10 13 16 21 18 3 6 5 8 12 14 17 19 15 20 9 11[...]

CONTROL P ANEL INSTRUCTIONS 4-2 1. DISPLAY: The Display includes a clock and indicators to tell you time of day, cooking time settings and cooking functions selected. 2. POPCORN: Touch this pad when popping popcorn in your microwave oven. 3. POTATO: Touch this pad to cook potatoes from 1 to 4. 4. BEVERAGE: Touch this pad to reheat one cup or two cu[...]

5-1 SCHEMA TIC DIAGRAM OVERALL CIRCUIT DIAGRAM[...]

MA TRIX CIRCUIT FOR TOUCH KEY BOARD CUSTOM SET AUTO COOK TIME COOK KITCHEN TIMER POWER LEVEL N.C N.C Ez On CLOCK STOP/ CLEAR TIME DEFROST AUTO DEFROST AUTO REHEAT 5-2[...]

6-1 GENERAL PRECAUTIONS IN USE A. Never operate the unit when it is empty. Operating the oven with no load may shorten the life of the magnetron. Whenever cooking dry foods (dried fish, bread, etc.) or a small amount of food, be sure to put a glass of water into the cooking compartment. The glass turntable may become hot after operating, be careful[...]

PRELIMINAR Y A. SINCE NEARLY 2,100 VOLTS EXISTS IN SOME CIRCUITS OF THIS UNIT REPAIRS SHOULD BE CARRIED OUT WITH GREAT CARE. The filament leads of magnetron carry High Voltage with respect to ground. Extreme caution must be exercised. Never plug the unit into a power source to determine which component is defective in high voltage section. B. TO AV[...]

7-2 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 2 and should repair any unit found to have excessive emis[...]

MEASUREMENT WITH THE OUTER CASE REMOVED (1) 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. - Around the magnetron - The waveguide WARNING: AVOID CONTACTING ANY HIGH VOLT[...]

IMPORT ANT NOTES: UNIT MUST BE DISCONNECTED FROM ELEC- TRICAL OUTLET WHEN MAKING REPAIRS, RE- PLACEMENTS, ADJUSTMENTS AND CONTIN- UITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED. THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE - I.E. TEST PROBE CONNECTED TO 10K[...]

7-5 HOW TO REMOVE THE F .P .C. CONNECTOR Follow the steps below as illustrated in Figures 4 and 5 to remove the F.P.C. connector. (1) Hold the edges of the plastic fastener with thumb and forefinger. (Figure 4) (2) Lift up the lever of the plastic fastener from the terminal socket by lightly pressing the lever end with forefinger. (Figure 5) (3) Re[...]

B. REMOVING THE OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws securing it to the out case. (2) Remove two screws securing it to the front bracket. (3) Remove two screws securing it to the air duct. (4) Remove the mounting plate by turning the two screws securing it to the out case. (5) Remove the base plate by removing six sc[...]

Latch Board WH (from H.V .Transformer) WH(from Monitor S/W) WH ( from Oven Thermostat ) WH ( from Cooktop lamp Secondary Interlock Switch Monitor Interlock Switch Primary Interlock Switch GN(from P.C.B) YL(from P.C.B) WH (from Secondary switch) RD (from Ry 7) Figure 9 Latch Board Secondary Interlock Switch Interlock Monitor Switch Primary Interlock[...]

Figure 13 Figure 11 Figure 12 vertgrille mount all outcase Magnetron D. REMOVING MAGNETRON (Figures 11 Through 13) (1) Remove vertgrille. (2) Remove mount all. (3) Remove outcase. (4) Discinnect the wireleads. (5) Remove the 3 screws and Magnetron very carefully. NOTES: • When removing the magnetron, make sure that its dome does not hit any adjac[...]

E. REMOVING DOOR (Figure 14) (1) Remove the vent grille by two screws securing it to the outcase loosening. (2) Lift up and draw the door. NOTES: • After replacing the door, be sure to check that the primary interlock switch, the secondary interlock switch and the interlock monitor switch is in good operating normally. • After replacing the doo[...]

G. ASSEMBLING DOOR (1) 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. H. R[...]

I. REMOVING THE TURNT ABLE MOTOR (1) Remove the turntable. (2) Remove the turntable shaft VERY CAREFULLY with a slotted screwdriver. (Figure 19) (3) Remove the base plate by removing 6 screws securing it to the oven cavity. (Figure 20) (4) Disconnect the leadwire from the turntable motor terminals. (5) Remove the 2 screws securing the turntable mot[...]

7-12 ADJUSTMENT PROCEDURES To avoid possible exposure to microwave energy leakage, adjust the door latches and interlock switches, using the following procedure. The Interlock Monitor and Primary Interlock Switch act as the final safety switch protecting the user from microwave energy. The terminals between “COM” and “NC” of the Interlock M[...]

7-13 TEST THE LATCH AND SWITCH SEQUENCE (5) Open the oven door slowly. Watch the door latch, the Secondary Switch. Release Rod and Lever on the switches to make sure they are zero to the body of the switches in the following sequence: - Primary Interlock Switch - Secondary Interlock Switch - Interlock Monitor Switch Adjust the latch board until the[...]

7-14 A. PRIMARY INTERLOCK SWITCH TEST When the door is opened slowly, an audible click should be heard at the same time or successively at intervals and 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 adjusted in accordance with the adjustme[...]

7-15 - CAUTIONS - - DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE FIGURE 24) - ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST B[...]

7-16 COMPONENTS TEST PROCEDURES RESULTS HIGH-VOLTAGE CAPACITOR HIGH-VOLTAGE DIODE Measure the resistance: (1) Terminal to terminal Ohm- meter Figure 25-a (2) Terminal to case Ohm- meter Figure 25-b Measure the continuity: (1) Forward Ohm- meter Figure 26-a (1) Reverse Ohm- meter Figure 26-b Normal reading: Momentarily indicates several ohms, and th[...]

CUSTOM SET AUTO COOK TIME COOK KITCHEN TIMER POWER LEVEL N.C N.C Ez On CLOCK STOP/ CLEAR TIME DEFROST AUTO DEFROST AUTO REHEAT Measure the resistance between terminal pins of connector KEY CONNECTOR. NOTE: When reconnecting the FPC connector, make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener. MATR[...]

7-18 COMPONENTS TEST PROCEDURES RESULTS RELAY2 Check for continuity of relay 2 with an ohm-meter. (Remove wire leads from relay 2 and operate the unit.) NOTES: • A MICROWAVE ENERGY 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[...]

7-19 (2) CHECKOUT PROCEDURES FOR RELAY. - PROBLEM (A) - T.T. motor and oven lamp turn on without touching START key when the door is closed. Remove the mate connector of I/O CON from the circuit board. Does the unit still operate? GOOD Replace the circuit board Replace RELAY3 - PROBLEM (B) - T.T. motor and oven lamp turn on When the door is closed [...]

7-20 NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON. (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board. 1) The start function fails to operate but the high voltage Systems, the interlock switches, the door sensing and the relay check good. 2) [...]

7-21 PROBLEM - A: “PLEASE SET TIME OF DAY” does not appear in display window when power supply cord is plugged into wall outlet. PROBLEM - B: Display does not show correct numbers and/or correct indications when programmed. Check: 1. POWER SUPPLY 2. FUSE (See “CHECKOUT PROCEDURES FOR FUSE BLOWING: on page 7-18) 3. OVEN CAVITY THERMOSTAT 1 1 C[...]

7-22 Resistance incorrect Check the continuity of H.V.C. (see page 7-16) Normal H.V.T. Resistance incorrect Normal H.V.C. Abnormal Replace H.V.D. Normal Magnetron Replace Magnetron Normal Normal H.V.D. Check the continuity of H.V.D. (see page 7-16) Replace H.V.C. Normal resistance Replace H.V.T. Normal resistance Runs Runs Runs Contact OK Replace c[...]

7-23 PROBLEM - D : No buzzing when touching the key, between stages or at end of cooking 1 Normal circuit board Check normal operation circuit board Replace circuit board Runs[...]

7-24 PROBLEM - E : Ventilation fan does not operate when “ FAN HIGH/LOW ” key is touched. 1 Check: 1. POWER SUPPLY 2. FUSE Runs Runs Runs Runs Contact OK NO contact Replace oven thermostat Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector S1 (see page 7-4) Replace ventil[...]

8-1 EXPLODED VIEW DOOR 13581A 13552A 13536A 13213A 14890A 13720D 13650A 14970A 14026A WTT028[...]

8-2 CONTROL P ANEL 24810P 23572A 23506A *07 26871 1 24781M WTP018 WTT029[...]

8-3 OVEN CA VITY 36912C 63302A WTT022 WTT028 WTT029 331 12U 368771 WTT029 34810T 33530A 34890C WTT022 35230A 63303A 34810Q 34960A WTT021 *02 *01 *04 *05 535501[...]

8-4 LA TCH BOARD 466001 43500A 466003 466001 44510A 43501A WSZ084[...]

8-5 INTERIOR (I) 56170D 33390G 34370T 35889A WTP013 WTT021 54810C 50CZZH WSZ002 56851D WTT021 WSZ002 33052A 56324A WSZ002 53300A WTT021 36549S 33740A 53300B WTT021 WSZ098[...]

8-6 INTERIOR (II) 55006F 36549V 56912B 53550L 55262A 55231C 56804A WTT028 WSZ002 56930V 50FZZA 568771 56411A[...]

8-7 INST ALLA TION WSZ133 44360A WWZ068 63300M 65862D 65862B WBZZ01 WSZ098 WWZ068 63861A WBZZ02 WSZ136[...]

8-12 SCHEMA TIC DIAGRAM OF P .C.B CUSTOM SET CLOCK E Z On KITCHEN LEVEL N.C N.C N.C N.C[...]

8-13 PRINTED CIRCUIT BOARD[...]

P/NO : 3828W5S2380 July, 2002 Printed in Korea[...]