MICROWAVE OVEN MG1480STB SERVICE MICROWAVE OVEN Manual CONTENTS 1. Precaution 2. Specifications 3. Operating Instructions 4. Disassembly and Reassembly 5. Alignment and Adjustments 6. Trouble shooting 7. Exploded Views and Parts List 8. PCB Diagrams 9.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open.
1. Precaution Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use, repair work can be extremely hazardous due to possible exposure to microwave radiation, as well as potentially lethal high voltages and currents. 1-1 Safety precautions ( ) 1. All repairs should be done in accordance with the procedures described in this manual. This product complies with Federal Performance Standard 21 CFR Subchapter J(DHHS). 11.
1-2 Special Servicing Precautions (Continued) 17. When checking the continuity of the witches or transformer, always make sure that the power is OFF, and one of the lead wires is disconnected. 18. Components that are critical for safety are indicated in the circuit diagram by shading, or . 19. Use replacement components that have the same ratings, especially for flame resistance and dielectric strength specifications.
2. Specifications 2-1 Table of Specifications TIMER 99 MINUTES 99 SECONDS POWER SOURCE 120V60Hz, AC POWER CONSUMPTION MICROWAVE : 1,500W GRILL : 1,300W OUTPUT POWER 950W (IEC-705 TEST PROCEDURE) OPERATING FREQUENCY 2,450MHz MAGNETRON OM75P(31)ESS COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 555(W) x 313(H) x 464(D)mm NET WEIGHT 18.5 kg SHIPPING WEIGHT 21.
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4. Disassembly and Reassembly 4-1 Replacement of Magnetron, Motor Assembly and Lamp Cover Air Remove the magnetron including the shield case, permanent magnet, choke coils and capacitors (all of which are contained in one assembly). Lamp Thermo S/W Bracket T.C.O 1. Disconnect all lead wires from the magnetron and lamp. 2. Remove a screw securing air cover. 3. Remove the air cover. 4. Remove screws securing the magnetron to the wave guide. 5. Take out the magnetron very carefully. 6.
4-3 Replacement of Door Assembly 4-3-1 Removal of Door Assembly Remove hex bolts securing the upper hinge and lower hinge. Then remove the door assembly. Upper Hinge Screw Lower Hinge 4-3-2 Removal of Door "C" Screw Insert flat screwdriver into the gap between Door "A" and Door "C" to remove Door "C". Be careful when handling Door "C" because it is fragile. Then remove the door assembly.
4-3-5 Reassembly Test After replacement of the defective component parts of the door, reassemble it and follow the instructions below for proper installation and adjustment so as to prevent an excessive microwave leakage. 1. When mounting the door to the oven, be sure to adjust the door parallel to the bottom line of the oven face plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment. 2.
4-6 Replacement of Control Circuit Board 4-6-1 Removal of Control Box 1. Be sure to ground any static electric charge in your body and never touch the control circuit. 2. Disconnect the connectors from the control circuit board. Screw 3. Remove screws securing the control box assembly. 4. Remove the screw securing the ground tail of the keyboard. Control Box 4-6-2 Removal of P.C.B Assembly 1. Pull the lever end of the plastic fastener and remove the Flexible Printed Circuit(FPC) of membrane panel.
5. Alignment and Adjustments PRECAUTION 1. High voltage is present at the high voltage terminals during any cook cycle. 2. It is neither necessary nor advisable to attempt measurement of the high voltage. 3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the high voltage capacitor. 5-1 High Voltage Transformer 1. Remove connectors from the transformer terminals and check continuity. 2.
5-4 High Voltage Capacitor 1. 2. 3. 4. 5. Check continuity of the capacitor with the meter set at the highest resistance scale. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9MΩ. A shorted capacitor will show continuous continuity. An open capacitor will show constant 9MΩ. Resistance between each terminal and chassis should read infinite. 5-5 High Voltage Diode 1. Isolate the diode from the circuit by disconnecting its leads. 2.
5-8 Output Power of Magnetron CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY. The output power of the magnetron can be measured by performing a water temperature rise test. Equipment needed : * Two 1-liter cylindrical borosilicate glass vessel (Outside diameter 190 mm) * One glass thermometer with mercury column NOTE: Check line voltage under load. Low voltage will lower the magnetron output.
5-10 Procedure for Measurement of Microwave Energy Leakage 1) Pour 275±15cc of 20±5° C(68±9° F) water in a beaker which is graduated to 600cc, and place the beaker in the center of the oven. 2) Start to operate the oven and measure the leakage by using a microwave energy survey meter. 3) Set survey meter with dual ranges to 2,450MHz. 4) When measuring the leakage, always use the 2inch spacer cone with the probe. Hold the probe perpendicular to the cabinet door.
6. Troubleshooting PRECAUTION 1. 2. 3. 4. CHECK GROUNDING BEFORE CHECKING FOR TROUBLE. BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT. DISCHARGE THE HIGH VOLTAGE CAPACITOR. WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORMER, DISCONNECT ONE LEAD WIRE FROM THESE PARTS AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE ON. TO DO OTHERWISE MAY RESULT IN A FALSE READING OR DAMAGE TO YOUR METER. 5. DO NOT TOUCH ANY PART OF THE CIRCUIT OR THE CONTROL CIRCUIT BOARD, SINCE STATIC DISCHARGE MAY DAMAGE IT.
6-1 Electrical Malfunction(continued) SYMPTOM CAUSE CORRECTIONS Oven lamp and fan motor turn on 1. Misadjustment or loose wiring of primary latch switch 2. Defective primary latch switch Oven can program but timer does not start. 1. Open or loose wiring of secondary interlock switch 2. Off-alignment of primary interlock 3. Defective secondary interlock S/W Microwave output is low;. Oven takes longer time to cook food. 1. Decrease in power source voltage. 2.
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7-2 Main Parts List No. Code No. Description Specification Q'ty Remark MB01 DE96-00005C ASSY BODY LATCH 2&2 ALL,D/SECSING VE,PP(FH44N),-,-,- 1 MB02 3405-001032 SWITCH-MICRO 125/250VAC,16A,200GF,SPDT 1 MON S/W MB03 3405-001034 SWITCH-MICRO 125/250VAC,16A,200GF,SPST-NO 1 PRI S/W MB04 DE66-90114A LEVER-S/W PP(FH44N),-,-,-,3.5g,NTR,3RD-W MW5592W,- 1 MB05 DE66-40001C LATCH-BODY -,-,-,-,-,NTR,39.2g 1 MB08 3405-001042 SWITCH-MICRO DC 24V,0.
7-3 Control and Door Parts List No. Code No. Description Specification Q'ty MC01 - ASSY CONTROL-BOX 120V60HZ,MG1460WA/XAX,WHITE,GRILL 1 MC02 DE34-00090L SWITCH MEMBRANE MG1460WA/XAX,-,-,PET,-,120V60HZ,S2,WHITE 1 MC03 DE72-70208C CONTROL-PANEL M1D33/CE2D33,ABS(HR0370U),P/WHT(W9501),- 1 MC04 DE61-70026A SPRING-BUTTON D17,CS,SWP,SWP,PI0.7,PI0.7,PI0.7,-,D17,-,L25.
7-4 Standard Parts List Code No.
8. P.C.B Diagrams 8-1 P.C.
8-2 P.C.B Parts List Code No. Description Specification Q'ty Remark 3501-001155 RELAY-MINIATURE 24VDC,200MW,3000MA,1FORMA,10MS,10MS 1 RY01 3501-001188 RELAY-POWER 24V DC,0.53W,-,1FormA,9.3ms,10mS 1 RY02 3501-001209 RELAY-POWER 24V DC,0.53W,-,1FORMA,9.3MS,10MS 1 RY04 3708-001551 CONNECTOR-FPC/FC/PIC 14P,1.
9. Schematic Diagrams 9-1 Schematic Diagrams WARNING POWER MUST BE DISCONNECTED BEFORE SERVICING THIS APPLIANCE CAVITY TCO L FAN MOTOR FM MAIN RELAY L.V.TRANS 120V DM 21V 0V COM H. V. CAPACITOR NC NO GRILL RELAY VARISTOR 120V 130V 40W POWER CORD AC 120V/60Hz HEATER H. V. TRANSFORMER MONITOR SWITCH LAMP GRILL TCO PRIMARY S/W D/MOTOR FUSE 250V20A FF 0V A MAGNETRON MGT TCO POWER RELAY (SECONDARY INTERLOCK) 1. INPUT : 120V 60HZ 2. DOOR : OPEN 3. LAMP : ON 4. : P.C.B PATTERN 5. : P.C.
ELECTRONICS ©Samsung Electronics Co., Ltd. November 2001 Printed in Korea Code No.
