삼 정 흥 판 MODEL 721.85062 721.85063 721.85064 721.85069 DIVISION 22 BASIC FIELD MANUAL FOR MICROWAVE OVEN MODEL 721.85062010 721.85063010 721.85064010 721.
CAUTION WARNING TO SERVICE TECHNICIANS 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. b.
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. CONTENTS (Page) Safety Precautions .............................................................................................................................................. 2 1. Specification ...................................................................................................................
1. SPECIFICATIONS Rated Power Consumption ................................1700W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output ...............................................1100W (IEC60705) Frequency ..........................................................2450 MHz ±50 MHz Power Supply .....................................................120 VAC, 60 Hz Rated Current ....................................................14 Amp.
2. CAUTIONS Unlike other appliances,the microwave oven is high-voltage and high-current equipment. Though it is free from danger in ordinary use, extreme care should be taken during repair. MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating device if it is improperly used or connection.
3. INSTALLATION BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. PRECAUTIONS ON INSTALLATION A. Plug the power supply cord into a 120V AC, 60Hz, single-phase power source with a capacity of at least 20 amperes. 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, radio, etc. to prevent interference.
4.
4-2. Explanation of Control Panel 13. Clock Touch this pad to enter the correct time of day. NOTE: Styling and features vary by model. 14. Kitchen Timer Touch this pad to set the kitchen timer. 1. DISPLAY The display includes a clock and indicators to tell you time of day, cooking time settings, cook powers, quantities, weights and cooking functions selected. 15. Turntable On/Off Touch this pad to turn off the turntable. “T/TABLE OFF” will appear in the display. 2.
5. WIRING DIAGRAM / KEY MATRIX 5-1.
5-2. Key Matrix KEY MATRIX 5 6 7 8 9 10 11 12 13 14 1 1 2 3 4 5 6 7 8 9 0 2 CUSTOM SET TIME COOK POWER LEVEL WARMING (Hold Warm) T/TABLE ON/OFF KITCHEN TIMER ENTER START CLOCK AUTO VENT OFF AUTO COOK 3 VENT Hi / Low / OFF (Vent On / Off) TURBO (Vent Speed) LIGHT SENSOR VEGGLES STOP CLEAR SOFTEN MELT QUICK DEF.
6. TROUBLESHOOTING 6-1. General Information for Service GENERAL PRECAUTIONS IN USE FEATURES AND SPECIFICATIONS FEATURES 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 when touching it. B.
6-2. Safety Caution (3) Do not operate the unit until it is completely repaired, if any of the following conditions exist. The unit must not be operated. (a) The door does not close firmly. (b) The hinge is broken. (c) The door seal is damaged. (d) The door is bent or warped, or there is any other visible damage on the unit that may cause microwave energy leakage. NOTE: Always keep the seal clean. (e) Make sure that there are no defective parts in the interlock mechanism.
6-3. Basic Check Summary 120 V Ac BK-L WH-N 120V Ac BK-CN1-3 WH-CN1-5 Symptom : Dead Check : Open/Short Symptom: Dead Check : Open/Short (It is normally recovered if the set is cooled down) Symptom: Dead Check :Open/Short Symptom #1(Door is closed): No cook, Operate F.M, S.M, T.T.M. automatically Check: Open/Short when the door is closed. (Switch) Symptom #2(Door is open): Not operate F.M, S.M, T.T.M. Check: Open/Short when the door is open.
6-4.
4 Is there any beep sound in No continuity test between the ends of thermostats? (Oven , Magnetron) Does the display operate? No 1 When you push the any key, Yes is there any beep sound Replace the thermostats. Go to No.8 of this flow chart. No Power Off 2 Is the connector connected to PCB? Yes Go to No.8 of this flow chart.
6 Is there any beep sound in continuity test between the ends of noise filter? Neutral terminal of Noise filter No No Reconnect or repair the connector.
Keypad Failure MICOM • Start key or EZ-ON key works if the door is closed.
3 When the door is opened, Is the voltage of door sensing part over 4V? (Pin 1 to Pin 3 of CN4) Does the keys operate? No Power ON 1 Do not only START key and EZ-ON key operate? Door should be closed? Yes 2 Is there beep sound in continuity test between the ends of latch board? Secondary Switch (Door should be closed) No No No Replace the PCB (EBR64419605) Check PWB Go to No.5 of this flow chart.
No Heat / No Cook -19-
3 Is the connector connected to Power PCB and MAIN PCB Yes assembly disconnected or disassembled? (CN6, CN7) After power on, does the product operate? No 1 Repeat door open and close Yes more than three times. Does product operate? No Alternate with explanation (Refer to the Note) 2 Is there any beep sound in Yes continuity test between TAB1 and TAB2_(EZ-On) PCB No Problem Reconnect or repair the connector.
Power Off 5 Is there any beep sound in continuity test between the ends of latch board? - primary switch (Door should be closed.) No 7 Is the resistance of high voltage Transformer out of rage? Adjust latch board (Refer to 9-1, 9-2) Yes Replace the High Voltage Transformer Test Point 1. Primary winding (High, Low): 0.2 ~ 0.5 Ohm 2.
8 Is the connector connected to High Voltage capacitor assembly disconnected or disassembled? Yes 11 Is the resistance of the high voltage diode out of rage? (Refer to 10) Reconnect or repair the connector. dd aarr rrww FFoo Yes No 9 Is the resistance of the high voltage capacitor out of rage? (Refer to 10) Test Point Yes 12 Is the connector connected to magnetron assembly disconnected or disassembled? Replace the high voltage capacitor.
4 Push the EZ-ON (Operate) Is the voltage of both ends of the D30 over 8 V? Turntable Motor Does Not Work Power ON 1 Does the turntable motor operate? No 2 Does the Fan Motor turn on when the EZ-On button is pressed? No 3 When door is closed, does the oven lamp turn on? Yes Yes Adjust the Primary latch board (Refer to 9-1, 9-2) No -23- No Replace the PCB (EBR64419605)
4 When the door is opened, Is the voltage of door sensing part over 4V? (Pin 1 to Pin 3 of CN4) Turn on automatically Is the product turn on automatically without pushing the start key? No Replace the PCB (EBR64419605) Yes 1 Repeat Door Open and close Yes more than three times. Dose the product operate? No Alternate with explanation (Refer to the Note) Power Off 2 Is there any beep sound in continuity test between the ends of latch board? - secondary switch (Door should be closed.
7. MICROWAVE LEAKAGE TEST CAUTIONS EQUIPMENT- • 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 manufacturer, importer, or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW/cm2 and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage.
MEASUREMENT WITH THE OUTER CASE REMOVED NOTE WHEN MEASURING (1) Do not exceed meter full scale deflection. (2) The test probe must be removed no faster than 1 inch/sec (2.5cm/sec) along the shaded area, otherwise a false reading may result. (3) 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.
8. POWER OUTPUT MEASUREMENT (1) Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of (1000 ± 5) g of potable water. (2) The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 1/8” (3 mm) and an outside diameter of approximately 7.6” (190 mm). (3) The oven and the empty vessel are at ambient Temperature (T0) prior to the start of the test.
9. INTERLOCK SYSTEM 9-1. Interlock Mechanism The door lock mechanism is 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 resulting from the microwave leakage. ADJUSTMENT PROCEDURES To avoid possible exposure to microwave energy leakage, adjust the door latches and interlock switches, using the following procedure. CHECK THE DOOR LATCH AND SWITCH CLOSING.
TEST THE LATCH AND SWITCH SEQUENCE (7) When you achieve the proper sequence of switches in Steps 5 and 6, tighten the latch board screws at that point. (5) Open the oven door slowly. Watch the door latch, the Secondary Switch.
9-2. Interlock Continuity Test A. PRIMARY INTERLOCK SWITCH TEST B.S ECONDARY 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 a adjusted in accordance with the adjustment procedure. Disconnect the wire lead from the primary switch.
10. COMPONENT TESTING INFORMATION 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 LEAD WIRES FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. 2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN. A. TEST PROCEDURES COMPONENTS TEST RESULTS H.V.TRANSFORMER 1. Remove wire leads. 2.
COMPONENTS H.V.DIODE (RECTIFIER) TEST STEP 1. Test the diode to see if it is shorted. Procedure: 1. Select the ohm scale on the meter. 2. Place the meter leads across the diode as pictured in Figure 1. The reading should be “40MΩ,” “OL,” or a reading of infinity. 3. Reverse the meter leads. The reading should again indicate a reading of infinity. If the diode shows “infinity” in BOTH directions, it is NOT shorted. 4. If the diode is not shorted, proceed to step 2. STEP 2.
COMPONENTS VENTILATION MOTOR RELAY 2 NOISE FILTER TEST RESULTS 1. Remove wire leads. Install the magnetron seal in the correct position. Check that the seal is in good condition. 2. Measure resistance. (ohm meter scale: Rx1) Filament terminal 3. Measure resistance. (ohm meter scale: Rx1000) ·Filament to chassis 1. Measure continuity. (ohm meter scale: Rx1) 2. Remove the lead wires and operate oven at power level 1 through power level 10. Power Level 1 2 3 4 5 6 7 8 9 10 1.
COMPONENTS TIRRER MOTOR PCB ASSEMBLY TEST RESULTS 1. Remove lead wires. 2. Measure resistance. (ohm meter scale: Rx1000) Nomal: Approximately 120 to 135 ohms Abnormal: Infinite 1. Unplug microwave oven or disconnect power. 2. Remove wires. 3. Measure resistance (ohm meter scale: Rx1000) Nmornal: Approximately L(1)-N(1): 1.0 to 2.
11. DISASSEMBLY INSTRUCTIONS (4) Remove 6 screws securing the circuit board. IMPORTANT NOTES: UNIT MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPAIRS, REPLACEMENTS, ADJUSTMENTS AND CONTINUITY CHECKS. WHEN RECONNECTING THE WIRE LEADS TO ANY PART, MAKE SURE THE WIRING CONNECTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIRCUIT DIAGRAM. (ESPECIALLY SWITCHES AND HIGH VOLTAGE CIRCUIT.) Circuit Board A.
HOW TO REMOVE THE F.P.C. CONNECTOR HOW TO INSERT THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 4 and 5 to remove the F.P.C. connector. Follow the steps below as illustrated in Figures 6 and 7 to insert the F.P.C. connector. (1) Insert the F.P.C. connector into the terminal socket securely with the fingers. (2) Hold the plastic fastener with thumb and forefinger of the other hand, and push it slowly into the terminal socket. (Figure 6) NOTE: When reconnecting the F.P.
B. REMOVING THE OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws securing it to the outer case. (2) Remove two screws securing it to the air duct. (3) Remove the mounting plate by turning the screws (1 or 2 screws) securing it to the outer case. (4) Remove two screws on the left central edge and two screws on the right central edge of the base plate. Remove the fan bracket from the outer case by removing one screw securing it to the outer case. (5) Remove four screws of the rear cavity.
C REMOVING THE DOOR INTERLOCK SWITCHES (Figures 9,10) (1) Disconnect the wire leads from the interlock switches. (2) Remove two screws securing the Latch Board. (3) Make necessary replacements and check microwave energy leakage according to ADJUSTMENT PROCEDURES on page 28. WIRE COLOR -38- SYMBOL COLOR WH BK BN RD YL PK BL GY GN N.P.
D. REMOVING MAGNETRON (1) (2) (3) (4) E. REMOVING STIRRER FAN (Figures 11 Through 12) Remove the vent grille by loosening two screws. (Figure 11) Remove the outcase. See page 7-6. Remove four tap tite screws securing the magnetron to the wave guide. Remove the magnetron VERY CAREFULLY. (Figures 13 and 14) (1) Remove one rivet assembly securing it to the oven upper plate by using knife blade. (2) Pull out the cover shifting left side.
F. REMOVING DOOR (Figure 15) H. ASSEMBLING DOOR (1) Remove the vent grille by two screws securing it to the outcase loosening. (2) Lift up and draw the 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.
(3) Carefully pull the ventilation motor assembly out of the microwave oven. (See Figure 18-b) J. REMOVING THE TURNTABLE MOTOR (1) Remove the glass tray and rotating ring. (2) Remove the turntable shaft VERY CAREFULLY with a hand. (Figure 19) (3) Remove the base plate by removing 8 screws securing it to the oven cavity. (Figure 20) (4) Disconnect the leadwire from the turntable motor terminals. (5) Remove the 2 screw securing the turntable motor to the oven cavity assembly.
K. REPLACING THE HUMIDITY SENSOR (1) Remove the sensor by removing two screws in front of the lamp cover & removing one screw securing it to the air duct. (See Figure 22) (2) Mount the new humidity sensor to the air duct.
#EV# 12.
#EV# CONTROLLER PARTS (I) FOR MODELS 2004 2006 2381 W130 2008 2002 2000 MBM2 -45-
#EV# OVEN CAVITY PARTS W138 For Model 721.85064 721.85062 W142 For Model 721.85069 721.
#EV# LATCH BOARD PARTS 4000 4002 W102 4001 4003 4004 4002 -48-
#EV# INTERIOR PARTS (I) W109 5041 5012 W110 5001 5073 W109 5010 W109 5412 5075 3002 W109 5216 W105 3008 5007 5069 3012 W265 5049 W109 5009 W140 W101 5008 5002 W248 3009 5058 5024 5043 5030 W105 5116 5044 5035 5000 W281 3004 5018 W101 5144 -49-
#EV# INTERIOR PARTS (II) 5460 W107 5074 5011 5206 W109 5015 W109 5038 3027 5006 5014 5117 W109 5117 3047 5037 -50-
#EV# INSTALLATION PARTS 6011 6008 6010 6009 USE & CARE MFL1 INSTALLATION MANUAL MFL3 COOKING GUIDE LABEL MEZ1 -51- UPPER TEMPLATE MBM4 WALL TEMPLATE MBM5
P/NO : MFL57016013 Printed in Korea
