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ORDER NO.PAPMOSH1312046SE Microwave Oven NN-SE284S NN-SE284B NN-SE284W CPH(CANADA) Please file and use this manual together with the service manual for Model NN-S262SF (Order No.SIMMC0203005C1) © Panasonic Appliances (Shanghai) Co., Ltd. 2013. Microwave Oven NN-SE284S / NN-SE284B / NN-SE284W 2 NN-SE284S / NN-SE284B / NN-SE284W 3 NN-SE284S / NN-SE284B / NN-SE284W CONTENTS Page 1 SCHEMATIC DIAGRAM 5 2 DESCRIPTION OF OPERATING SEQUENCE 6 Page 5.2. Measurement of microwave output 12 6 PROCEDURE FOR MEASURING MICROWAVE ENERGY 2.1. Variable power cooking control 6 2.2. Inverter power supply circuit 6 6.1. Equipment 13 2.3. Inverter defrost 6 6.2. Procedure for measuring radiation leakage 13 2.4. Sensor cooking 6 6.3. Record keeping and notification after measurement 13 2.5. Sensor reheat 7 6.4. At least once a year, have the radiation monitor checked LEAKAGE for calibration by its manufacturer. 3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 8 13 14 3.1. Check the grounding 8 3.2. Inverter warnings 8 7.1. (Troubleshooting) Oven stops operation during cooking 16 3.3. Part replacement. 9 7.2. (Troubleshooting) Other problems 17 7.3. Trouble related to Digital Programmer Circuit 18 7.4. Troubleshooting of inverter circuit (U) and magnetron 19 7 TROUBLESHOOTING GUIDE 3.4. When the 20A fuse is blown due to the malfunction of the 9 interlock monitor switch: 7.5. SIMPLE WAY OF H.V. INVERTER/MAGNETRON 3.5. Avoid inserting nails, wire etc. through any holes in the 9 unit during operation. 3.6. Verification after repair 9 3.7. Sharp edges 9 4 COMPONENT TEST PROCEDURE 15 TROUBLESHOOTING 20 7.6. H.V.INVERTER BOARD MAIN PARTS LIST (F606Y9X90AP) 10 8 EXPLODED VIEW AND PARTS LIST 4.1. Primary, Secondary Interlock Switch & Power Relay RY1 20 21 8.1. EXPLODED VIEW 21 10 8.2. PARTS LIST 22 4.2. Interlock Monitor Switch 10 8.3. DOOR ASSEMBLY 24 4.3. Magnetron 10 8.4. ESCUTCHEON BASE ASSEMBLY 25 4.4. Inverter power supply (U) 11 8.5. PACKING AND ACCESSORIES 27 4.5. Humidity sensor 11 8.6. WIRING MATERIALS 28 5 MEASUREMENTS AND ADJUSTMENTS 12 5.1. Adjustment of primary interlock switch, secondary interlock switch and interlock monitor switch. 12 4 9 DIGITAL PROGRAMMER CIRCUIT 29 9.1. SCHEMATIC DIAGRAM 29 9.2. PARTS LIST 31 NN-SE284S / NN-SE284B / NN-SE284W 1 SCHEMATIC DIAGRAM 5 NN-SE284S / NN-SE284B / NN-SE284W 2 DESCRIPTION OF OPERATING SEQUENCE 2.1. Variable power cooking control 2.3. When the Auto Control feature is selected and the Start pad is tapped: High Voltage Inverter Power Supply (U) controls output power by the signal from Digital Programmer Circuit (DPC). Power relay always stay on, but PWM (Pulse Width Modulation) signal controls microwave output power. 1. The digital programer circuit determines the power level and cooking time to complete cooking and indicates the operating state in the display window. Table shows the corresponding cooking times for respective serving by categories. NOTE: The ON/OFF time ratio does not correspond with the percentage of microwave power since approximately 2 seconds are required for heating of magnetron filament. Inverter Turbo Defrost SELECTED WEIGHT COOKING TIME 1.0 LB 5 min.28 sec. 2. When cooking time in the display window has elapsed, the oven turns off automatically by a control signal from the digital programmer circuit. Variable Power Cooking POWER SETTING OUTPUT MANUAL MICROWAVE POWER(%) DUTY APPROX. ON(SEC) OFF(SEC) HIGH P10 100% 22 0 P9 90% 22 0 P8 80% 22 0 MEDIUM-HIGH P7 70% 22 0 MEDIUM P6 60% 22 0 P5 50% 22 0 P4 40% 22 0 MEDIUM-LOW P3 30% 22 0 P2 20% 15 7 P1 10% 8 14 DEFROST P3 30% 22 0 2.2. Inverter defrost 2.4. Sensor cooking Auto sensor cooking without setting a power level or selecting a time. All that is necessary is to select an Auto Sensor Program before starting to cook. Understanding Auto Sensor Cooking As the food cooks, a certain amount of steam is produced. If the food is covered, this steam builds up and eventually escapes from the container. In Auto Sensor Cooking, a carefully designed instrument, called the humidity sensor element, senses this escape of steam. Then, based upon the Auto Sensor Program selected, the unit will automatically determine the correct power level and the proper length of time it will take to cook the food. Inverter power supply circuit The Inverter Power Supply circuit powered from the line voltage, 120V 60Hz AC input supplies 4,000V DC to the magnetron tube, and functions in place ofthe H.V. transformer, the H.V. capacitor and H.V. diode. NOTE: Auto Sensor Cooking is successful with the foods and recipes found in the Auto Sensor Cooking Guide. Because of the vast differences in food composition, items not mentioned in the Cooking Guide should be prepared in the microwave oven using power select and time features. Please consult Variable Power Microwave Cookbook for procedures. 1. The AC input voltage 120V 60Hz is rectified to DC voltage immediately. 2. DC voltage will be supplied to the switching devices called IGBT. These devices are switched ON-OFF by the 20 to 40 kHz PWM (pulse width modulation) signal from the microcomputer in the DPC. 3. This drives the High voltage transformer to increase voltage up to 2,000V AC. 4. Then the half-wave doubler voltage rectifier circuit, consisting of the H.V. diodes and capacitors, generates the necessary 4,000V DC needed for the magnetron. 5. Output power of the magnetron tube is always monitored by the signal output from the current transformer built into the inverter circuit. 6. This signal is fed back to the microcomputer in the DPC to determine operating conditions and output necessary to control PWM signal to the Inverter Power Supply for control of the output power. 6 NN-SE284S / NN-SE284B / NN-SE284W Explanation of the Auto Sensor Cooking process 1. T1 time The total amount of time it takes the microwave oven to switch to T2 time. 2. T2 time When the steam escapes from the cooking container placed in the oven, the humidity sensor detects it and the microprocessor calculates the balance of cooking time. This T2 time is then shown in the display and begins counting down. Balance of cooking time (T2 time) The balance of cooking time which is called T2 time, can be calculated by the following formula. T2 time (in sec.) = T1 time X K factor NOTE: The coefficient K is programmed into the microprocessor memory and they are listed in the following tables along with the P1 and P2 powers. NOTE: When "More" or "Less" pad is selected, the K factor varies resulting in T2 time to be increased or decreased. Example of calculating the T2 time Example 1: If the T1 time is measured to be 2 minutes and 40 seconds, and the Auto program selected is Oatmeal: T2 = T1 × K = 2 min. and 40 sec. × 0.1 = 160sec. × 0.1 = 16 sec. Category Oatmeal 2.5. P1 P2 Power Power Power Level P7 Power Level P7 K Factor Standard 0.5 Sensor reheat Auto Sensor Reheat is a quick and easy way to reheat refrigerated and room temperature foods. Simply press the [Sensor Reheat] pad. There is no need to select power level and cooking time. NOTE: The Auto Sensor Reheat process is same as Auto Sensor Cooking process. Category P1 P2 Power Power Sensor Reheat Power Level P10 Power Level P6 K Factor Standard 0.5 7 NN-SE284S / NN-SE284B / NN-SE284W 3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances, the microwave oven is a high voltage, high current device. Though it is free from danger in ordinary use, extreme care should be taken during repair. CAUTION Servicemen should remove their watches and rings whenever working close to or replacing the magnetron. 3.1. Check the grounding Do not operate on a two wire extension cord. The microwave oven is designed to be grounded when used. It is imperative, therefore, to ensure the appliance is properly grounded before beginning repair work. 3.2. Inverter warnings WARNING HIGH VOLTAGE AND HIGHTEMPERATURE (HOT/LIVE) OF THE INVERTERPOWER SUPPLY (U) The High Voltage Inverter Power Supply generates very high voltage and current for the magnetron tube. Though it is free from danger in ordinary use, extreme care should be taken during repair. The aluminum heat sink is also energized with high voltage (HOT), do not touch when the AC input terminals are energized. The power device Collector is directly connected to the aluminum heat sink. The aluminum heat sink may be HOT due to heat energy, therefore, extreme care should be taken during servicing. Grounding of the inverter circuit board H.V. Inverter warning WARNING FOR INVERTER POWER SUPPLY (U) GROUNDING Check the High Voltage Inverter Power Supply circuit grounding. The high voltage inverter power supply circuit board must have a proper chassis ground. The inverter grounding plate must be connected to the chassis. If the inverter board is not grounded it will expose the user to very high voltages and cause extreme DANGER! Be sure that the inverter circuit is properly grounded via the inverter grounding plate. 8 NN-SE284S / NN-SE284B / NN-SE284W VOLATGE 1. This is mandatory. Refer to “measurements and adjustments” for the location of these switches. For about 30 seconds after the oven is turned off, an electric charge remains in the high voltage capacitors of the Inverter Power Supply circuit board. 2. When replacing the fuse, confirm that it has the appropriate rating for these models. WARNING CAPACITORS DISCHARGE THE HIGH 3. When replacing faulty switches, be sure the mounting tabs are not bent, broken or deficient in their ability to hold the switches. When replacing or checking parts, remove the power plug from the outlet and short the inverter output terminal of the magnetron filament terminals to the chassis ground with an insulated handle screwdriver to discharge. Please be sure to contact the chassis ground side first and then short to the output terminal. 3.5. Avoid inserting nails, wire etc. through any holes in the unit during operation. Never insert a wire, nail or any other metal object through the lamp holes on the cavity or any holes or gaps, because such objects may work as an antenna and cause microwave leakage. 3.6. Verification after repair 1. After repair or replacement of parts, make sure that the screws of the oven, etc. are neither loosen or missing. Microwave energy might leak if screws are not properly tightened. 2. Make sure that all electrical connections are tight before inserting the plug into the wall outlet. 3. Check for microwave energy leakage. (Refer to procedure for measuring microwave energy leakage). CAUTION OF MICROWAVE RADIATION LEAKAGE USE CAUTION NOT TO BECOME EXPOSED TO RADIATION FROM THE MICROWAVE MAGNETRON OR OTHER PARTS CONDUCTING MICROWAVE ENERGY. IMPORTANT NOTICE Discharging the high voltage capacitors 1. The following components have potentials above 2000V while the appliance is operated. WARNING There is high voltage present with high current capabilities in the circuits of the primary and secondary windings, choke coil and heat sinkof the inverter. It is extremely dangerous to work on or near these circuits with the oven energized. DO NOT measure the voltage in the high voltage circuit including the filament voltage of the magnetron. • Magnetron • High voltage transformer (Located on inverter (U)) • High voltage diodes (Located on inverter (U)) • High voltage capacitors (Located on inverter (U)) Pay special attention to these areas. WARNING 2. When the appliance is operated with the door hinges or magnetron installed incorrectly, the microwave leakage can exceed more than 5mW/cm 2. After repair or exchange, it is very important to check if the magnetron and the door hinges are correctly installed. Never touch any circuit wiring with your hand or with an insulated tool during operation. 3.3. Part replacement. 3.7. When troubleshooting any part or component is to be replaced, always ensure that the power cord is unplugged from the wall outlet. 3.4. Sharp edges CAUTION Please use caution when disassembling or reassembling internal parts. Some exposed edges may be sharp to the touch and can cause injury if not handled with care. When the 20A fuse is blown due to the malfunction of the interlock monitor switch: WARNING When the 20A 120V fuse is blown due to the malfunction of the interlock monitor switch, replace all of the components (primary interlock switch, interlock monitor switch and power relay RY1). Also replace the secondary interlock switch when the continuity check reads shorted contacts. 9 NN-SE284S / NN-SE284B / NN-SE284W 4 COMPONENT TEST PROCEDURE 4.3. WARNING 1. High voltage is present at the output terminals of the High Voltage Inverter (U) including aluminum heat sink 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 power cord and discharge the high voltage capacitors (see page 8). 4.1. Continuity checks can only indicate an open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron. 1. Isolate magnetron from the circuit by disconnecting the leads. 2. A continuity check across magnetron filament terminals should indicate one ohm or less. Primary, Secondary Interlock Switch & Power Relay RY1 3. A continuity check between each filament terminal and magnetron case should read open. 1. Unplug lead connectors to Power Relay RY1 and verify open circuit of the Power Relay RY1 1-2 terminals. 2. Unplug lead connectors to Primary Interlock Switch and Secondary Interlock Switch. 3. Test the continuity of switches at door opened and closed positions with ohm meter (low scale). Normal continuity readings should be as follows. Primary Interlock Switch Secondary Interlock Switch Power Relay RY1 4.2. Door Closed 0Ω (Close) 0Ω (Close) Ω (Open) Door Opened Ω(Open) Ω(Open) Ω(Open) Interlock Monitor Switch 1. Unplug lead wires from Inverter Power Supply (U) primary terminals. 2. Connect test probes of ohm meter to the disconnected leads that were connected to Inverter Power Supply (U). 3. Test the continuity of Interlock Monitor Switch with door opened and closed positions using lowest scale of the ohm meter. Normal continuity readings should be as follows. Door Opened 0Ω (Close) Magnetron Door Closed Ω (Open) 10 NN-SE284S / NN-SE284B / NN-SE284W 4.4. Inverter power supply (U) 5. Program oven at High power for 1 minute and press [Start] pad. DO NOT try to REPAIR H.V. Inverter power supply (U). Replace complete H.V. Inverter(U) Unit. a. After approximately 3 seconds, oven stops operating. b. During oven operation, approximately 0.4A. Unplug CN701 the INPUT CURRENT 0.4A input current is FAILURE CODE Oven stops in 3 seconds after started. If both a and b check OK, the Inverter Power Supply (U) can be determined to be OK. 4.5. Humidity sensor In order to determine if the humidity sensor function of the digital programmer circuit is working, do the following test. 1. Program DPC. a. Press Timer/Clock pad twice. b. Press Start pad once. c. Press Power Level pad once. 2. Place a water load (100 ml) in the oven. 3. Press [Sensor Cook] pad. WARNING: HIGH VOLTAGE 4. Press [Power Level] pad. Test if failure codes H95, H97 or H98 appear when performing the following procedure. It is recommended to use an AC line input current ammeter for testing. 5. Press [Start] pad. 6. Humidity sensor detects steam after the [Start] pad is pressed. Test 1 7. The total amount of T1 cooking time appears in display window. If the range of cooking time is 50 sec. ~ 2 Min., humidity sensor function is normal. 1. With the oven unit’s AC power supply cord is unplugged from the wall outlet, unplug the 2 pin H.V. connector CN703 from the magnetron tube. 2. Place 1 liter of water load into oven cavity. 3. Plug in the oven’s AC power supply cord into outlet. 4. Program DPC. a. Press Timer/Clock pad twice. b. Press Start pad once. c. Press Power Level pad once. 5. Program oven at High power for 1 minute and press [Start] pad. a. After approximately 23 seconds, oven stops operating. b. During oven operation, the input current is approximately 0.5 to 1A. If both a and b are OK, proceed to test 2. Unplug CN703 INPUT CURRENT 0.5 to 1A FAILURE CODE Oven stops in 23 seconds after started. Test 2 Continued from Test 1 1. Unplug the oven’s AC power supply cord from outlet. 2. Unplug 3 pin connector CN701. CN703 remains unplugged. 3. Plug in the oven’s AC power supply cord into outlet. 4. Program DPC. a. Press Timer/Clock pad twice. b. Press Start pad once. c. Press Power Level pad once. 11 NN-SE284S / NN-SE284B / NN-SE284W 5 MEASUREMENTS AND ADJUSTMENTS 5.1. Adjustment of primary interlock switch, secondary interlock switch and interlock monitor switch. 1. Mount the Primary Interlock Switch, the Secondary Interlock Switch and the Interlock Monitor Switch to the door hook assembly as shown in illustration. 5.2. NOTE: Measurement of microwave output The output power of the magnetron can be determined by performing IEC standard test procedures. However, due to the complexity of IEC test procedures, it is recommended to test the magnetron using the simple method outlined below. No specific individual adjustments during installation of the Primary Interlock Switch, Secondary Interlock Switch or Interlock Monitor Switch to the door hook are required. Necessary Equipment: 2. When mounting the door hook assembly to the oven assembly, adjust the door hook assembly by moving it in the direction of the arrows in the illustration so that the oven door will not have any play in it. Check for play in the door by pulling the door assembly. Make sure that the latch keys move smoothly after adjustment is completed. Completely tighten the screws holding the door hook assembly to the oven assembly. *1 liter beaker *Glass thermometer *Wrist watch or stopwatch NOTE: Check the line voltage under load. Low voltage will lower the magnetron output. Take the temperature readings and heating time as accurately as possible. 1. Fill the beaker with exactly one liter of tap water. Stir the water using the thermometer and record the water’s temperature. (recorded as T1). 3. Reconnect the interlock monitor switch and check the continuity of the monitor circuit and all interlock switches again by following the component test procedures. 2. Place the beaker on the center of glass tray. Set the oven for High power and heat it for exactly one minute. 3. Stir the water again and read the temperature of the water. (recorded as T2). 4. The normal temperature rise at High power level for each model is as shown in table. TABLE (1L-1min. test) RATED OUTPUT TEMPERATURE RISE 1100W Min. 16.9°F(9.4°C) 12 NN-SE284S / NN-SE284B / NN-SE284W 6 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 6.2.1. Measurement with the outer panel removed. Whenever you replace the magnetron, measure for radiation leakage before the outer panel is installed and after all necessary components are replaced or adjusted. Special care should be taken in measuring around the magnetron. NOTE: 6.2.2. The U.S. Government standard is 5 mW/cm2 while in the customer’s home. 2mW/cm2 stated here is our own voluntary standard. (1mW/cm2 for Canada) 6.1. After all components, including outer panel are fully assembled, measure for radiation leakage around the door periphery, the door viewing window, the exhaust opening, control panel and air inlet openings. Equipment • Electromagnatic radiation monitor • Glass thermometer 212°F or 100°C 6.3. • 600cc glass beaker 6.2. Measurements with a fully assembled oven. Procedure for measuring radiation leakage Record keeping and notification after measurement • After any adjustment or repair to a microwave oven, a leakage reading must be taken. Record this leakage reading on the repair ticket even if it is zero. Note before measuring: A copy of this repair ticket and the microwave leakage reading should be kept by repair facility. • Do not exceed meter full scale deflection. Leakage monitor should initially be set to the highest scale. • Should the radiation leakage be more than 2 mW/cm 2 (1mW/cm 2 for Canada) after determining that all parts are in good condition, functioning properly, and genuine replacement parts as listed in this manual have been used, immediately notify PSTC, PPR or PCI. • To prevent false readings, the test probe should be held by the grip portion of the handle only and moved along the shaded area in Figure no faster than 1 inch/sec (2.5cm/sec). • Leakage with the outer panel removed: less than 5mW/cm 2. • Leakage for a fully assembled oven with door normally closed: less than 2mW/cm 2 (1mW/cm 2 for Canada). • Leakage for a fully assembled oven [Before the interlock switch (primary) is interrupted] while pulling the door: less than 2mW/cm 2. 1. Pour 275 ± 15cc (9ozss± 1/2oz) of 20°C ± 5°C (68° ± 9°F) water in a beaker which is graduated to 600cc, and place in the center of the oven. 2. Set the radiation monitor to 2450MHz and use it following the manufacturer´s recommended test procedure to assure correct results. 3. When measuring the leakage, always use the 2 inch (5cm) spacer supplied with the probe. 4. Tap the [Start] pad or set the timer and with the magnetron oscillating, measure the leakage by holding the probe perpendicular to the surface being measured. 13 NN-SE284S / NN-SE284B / NN-SE284W 6.4. At least once a year, have the radiation monitor checked for calibration by its manufacturer. 14 NN-SE284S / NN-SE284B / NN-SE284W 7 TROUBLESHOOTING GUIDE DANGER: HIGH VOLTAGES 1. DO NOT RE-ADJUST PRESET CONTROL on the H.V.Inverter (U). It is very dangerous to repair or adjust without proper test equipment because this circuit generates very large current and high voltage. Operating a misaligned inverter circuit is dangerous. 2. Ensure proper grounding before troubleshooting. 3. Be careful of the high voltage circuitry, taking necessary precautions when troubleshooting. 4. Discharge high voltage remaining in the H.V.Inverter (U). 5. When checking the continuity of the switches or the H.V.Inverter, disconnect one lead wire from these parts and then check continuity with the AC plug removed. Doing otherwise may result in a false reading or damage to your meter. When disconnecting a plastic connector from a terminal, you must hold the plastic connector instead of the lead wire and then disconnect it, otherwise lead wire may be damaged or the connector cannot be removed. 6. Do not touch any parts of the circuitry on the digital programmer circuit, since static electric discharge may damage this control panel. Always touch ground while working on this panel to discharge any static charge in your body. 7. 120V AC is present on the digital programmer circuit (Terminals of power relay’s and primary circuit of Digital Programmer Circuit). When troubleshooting, be cautious of possible electrical shock hazard. Before troubleshooting, operate the microwave oven following the correct operating procedures in the instruction manual in order to find the exact cause of any trouble, since operator error may be mistaken for the oven’s malfunction. H97 & H98 error code display If 3 times H97 or 2 times H98 exist, microwave oven can not be used any more, even if the defective parts already be replaced & un-plug and plug-in again. How to reset for the service: Please take the following steps 1. Plug-in oven. 2. Press Stop/Reset pad once. 3. Open the door. 4. Keep pressing Start pad for more than 2 seconds until buzzer beeps. 5. Press Stop/Reset pad three times, oven will show the total usage time of magnetron. 6. Press Power Level pad once, oven will show the total number of occurrence of H97 & H98. 7. Keep pressing Start pad for more than 2 seconds (until buzzer beeps) to reset. 8. While finish resetting, one beeps, and show “EEPEND”. 9. Press Stop/Reset to return to initial stage. Magnetron usage time display Oven has magnetron usage time display function but it will not be activated in normal operation mode. To show magnetron usage time result, please take the following steps: 1. Plug-in oven. 2. Press Stop/Reset pad once. 3. Open the door. 4. Keep pressing Start pad for more than 2 seconds until buzzer beeps. 5. Press Stop/Reset pad three times, oven will show the total usage time of magnetron. (note1:the magnetron usage time is kept in L.S.I. memory.) (note2:Magnetron usage time display is in hours.) NOTE: To clear the recorder of L.S.I. memory. a. Press Start pad for more than 2 seconds until buzzer beeps. b. While finish deleting, one beeps and show “EEPEND”. c. Press Stop/Reset to return to initial stage. 15 NN-SE284S / NN-SE284B / NN-SE284W 7.1. (Troubleshooting) Oven stops operation during cooking SYMPTOM 1. Oven stops in 3 seconds pressing [Start] pad CAUSE CORRECTIONS after No 120V AC is supplied to H.V.Inverter (U) CN702 1. Interlock Switch terminals 2. Power relay RY1 3. Loose lead wire connector CN701, CN702 4. H.V. Inverter (U) Oven stops in 23 seconds after H.V.Inverter (U) operates by the control signals 1. Magnetron pressing [Start] pad from DPC but magnetron is not oscillating 2. Loose lead wire connector CN703 3. H.V. Inverter (U) Oven stops in 10 seconds after Steam sensor circuit is not functioning 1. Steam sensor pressing [Start] pad 2. DPC (Auto sensor cooking) 3. Open or loose wiring of sensor terminal from connector CN2 on DPC 2. No display and no operation at all. Most probably loose connection of connectors, or 1. Allign door, Door Interlock Switches Fuse is blown. door latch mechanism is not adjusted properly 2. Loose wiring connectors 16 NN-SE284S / NN-SE284B / NN-SE284W 7.2. (Troubleshooting) Other problems SYMPTOM 1. Oven is dead. Fuse is OK. No display and no operation at all. 2. No display and no operation at all. Fuse is blown. 3. Oven does not accept key input (Program) 4. Fan motor turns on when oven is plugged in with door closed. 5. Timer starts count down but no microwave oscillation. (No heat while oven lamp and fan motor turn on) 1. 2. 3. 4. 1. 2. 3. 4. 1. 2. 1. 2. 3. 1. 2. 3. 6. Oven can program but timer does not start countdown. 7. Microwave output is low. Oven takes longer time to cook food. 8. Fan motor turns on and turntable motor rotates when door is opened. 9. Oven does not operate and return to plugged in mode as soon as [Start] pad is pressed. 10. Loud buzzing noise can be heard. 11. Turntable motor does not rotate. 12. Oven stops operation during cooking. 4. 5. 6. 1. 2. 3. 1. 2. 3. 1. CAUSE CORRECTIONS Open or loose lead wire harness Open thermal cutout / thermistor Check thermal cutout is defective. Open low voltage transformer Defective DPC Shorted lead wire harness Check adjustment of primary, secondary interlock switch and interlock monitor switch Defective primary interlock switch including door. Defective interlock monitor switch (NOTE 1) Defective Inverter Power Supply (U) NOTE 1: Replace components (primary interlock switch, interlock monitor switch and power relay RY1). Also replace the secondary interlock switch when the continuity check reads shorted contacts. Key input is not in proper sequence Refer to operation procedure. Defective DPC or defective touch screen Refer to DPC troubleshooting. Misadjustment or loose wiring of secondary Adjust door and interlock switches. interlock switch Defective secondary interlock switch Door switch CN7 Off-alignment of primary interlock switch Adjust door and interlock switches. Open or loose connection of high voltage circuit especially magnetron filament circuit NOTE: Large contact resistance will cause lower magnetron filament voltage and cause magnetron to have lower output and/or be intermittent. Defective high voltage component Check high voltage component according to component test procedure and replace if it is H.V. Inverter Power Supply (U) defective. Magnetron Open or loose wiring of power relay RY1 Defective primary interlock switch Defective DPC or power relay RY1 Refer to DPC troubleshooting Open or loose wiring of secondary interlock switch Off-alignment of secondary interlock switch Defective secondary interlock switch Decrease in power source voltage Consult electrician Open or loose wiring of magnetron filament circuit.(Intermittent oscillation) Aging change of magnetron Low voltage transformer on DPC. 1. Defective DPC Check grounding connector on escutcheon base. 1. 1. 2. 1. Loose fan and fan motor Open or loose wiring of turntable motor Defective turntable motor Open or loose wiring of primary and secondary interlock switch 2. Operation of thermal cutout 17 Adjust door and interlock switches. NN-SE284S / NN-SE284B / NN-SE284W 7.3. Trouble related to Digital Programmer Circuit SYMPTOM STEP CHECK No display when oven is first plugged 1 Fuse pattern of D.P.C. in 2 3 4 No key input 1 No beep sound 1 No microwave oscillation at any power 1 2 3 Dark or unclear display 1 Missing or lighting of unnecessary segment 1 H95/H97/H98 appears in window and oven stops operation.Program High power for 1 minute and conduct following test quickly, unless H95/H97/H98 appears and oven stops 1 2 RESULT Normal Open Abnormal 0V Normal IC10 pin 4 voltage Abnormal Normal=14V IC1 pin 8 voltage or IC10 pin5 voltage Abnormal Normal=5V Touch screen continuity Abnormal Normal IC1 pin 40 voltage Abnormal Normal=5V IC1 pin 47 voltages while operation at high Abnormal power Normal=5V Collector of Q220 voltage Abnormal Normal 0.7V Short circuit between collector of Q220 Still not turn on and emitter of Q225 RY1 turns on Replace display and check operation Normal Abnormal Replace IC1 and check operation Normal Abnormal Unplug CN702 (2 pin) connector and Abnormal=0V measure voltage between terminals Normal=120V Unplug CN701 (3 pin) connector and Abnormal=0V measure pin1 voltage of D. P. C. CN3 Approx. AC 3V Low voltage transforment (L.V.T.) secondary voltage 18 CAUSE/CORRECTIONS →Step2 Replace D.P.C. or Fuse Pattern L.V.T. →Step3 Q10, ZD10, ZD11, ZD12 →Step4 IC10 IC1, Display Touch screen IC1 IC1 BZ210, IC220 IC1 →Step2 Q220 and/or Q225, Q226, Q227 →Step3 RL1 Q220 and/or Q225, Q226, Q227 Display IC1 IC1 Display 1. Latch Switch 2. D.P.C. /Power Relay →Step2 D.P.C. Magnetron NN-SE284S / NN-SE284B / NN-SE284W 7.4. Troubleshooting of inverter circuit (U) and magnetron This oven is programmed with a self diagnostics failure code system which will help for troubleshooting. H95, H97, H98 and H99 are the provided failure codes to indicate magnetron and inverter circuit problem areas. This section explains failure codes of H95, H97, H98 and H99. First, you must program the DPC into TEST MODE, press Time/Clock pad twice → Press Start pad once → press Power Level pad once. Program unit for operation. H95, H97, H98, H99 appears in display window a short time after [Start] pad is pressed and there is no microwave oscillation. Alternate way to troubleshoot oven with AC Ampere meter used H95, H97, H98, H99 appears in display window a short time after [Start] pad is pressed and no microwave oscillation with AC Ampere meter used for troubleshooting. 19 NN-SE284S / NN-SE284B / NN-SE284W 7.5. SIMPLE WAY OF H.V. INVERTER/MAGNETRON TROUBLESHOOTING Purpose: Simple way (3/23 seconds rule) of identifying whether it’s Magnetron, Inverter or others. Set-up: The unit under question is connected through the Ammeter as shown below. Procedure: Follow the matrix table below to identify the problem source. Note: Do not replace both Inverter board and Magnetron simultaneously and automatically without going through this procedure. Power will: Ammeter reading is: Shut off in 23 seconds 1. Between 0.5A and 1.0A. after “Start”. 2. Between 1.0A and 2.0A. To do: Remedy: Check and repair open magnetron circuit Open magnetron wiring between Inverter and magnetron terminal. Check continuity of D702 in Inverter PCB. Shut off in 3 seconds 1. Less than 0.5A after “Start” 1. D702 shorted Replace H.V.Inverter(F606Y9X90AP) 2. D702 is OK Replace magnetron Check open circuit: Interlock Switch, Replace defective component(s), or DPC, Power Relay and CN701 correct switch, cables and connectors. 7.6. Ref. No. DB701 L701 Q701 T701 C701 C702 H.V.INVERTER BOARD MAIN PARTS LIST (F606Y9X90AP) Part No. B0FBCR000004 F5020W100AP B1JAGV000017 F609A8X00AP F0C2H284A020 F0C2E455A331 Part Name & Description BRIDGE DIODE CHOKE COIL TRANSISTOR SI H.V. TRANSFORMER CAPACITOR CAPACITOR 20 Pcs/Set 1 1 1 1 1 1 Remarks 20A,600V 1150V Including:C706,C707,D701,D702 0.28µF/600VDC 4.5µF/250VDC NN-SE284S / NN-SE284B / NN-SE284W 8 EXPLODED VIEW AND PARTS LIST 8.1. EXPLODED VIEW 21 NN-SE284S / NN-SE284B / NN-SE284W 8.2. PARTS LIST NOTE: 1. When ordering replacement part(s), please use part number(s) shown in this part list. Do not use description of the part. 2. Important safety notice: Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacture’s specified parts. Ref. No. 1 2 3 3 3 4 5 Part No. F00067600CP F00336Z20AP F10096Z00SCP F10098Q00BAP F10098Q00HAP F100D6Z80AP F200ABL60CP Part Name & Description CAUTION LABEL FUSE LABEL CABINET BODY (U) CABINET BODY (U) CABINET BODY (U) BASE PLATE (U) OVEN (U) Pcs/Set 1 1 1 SE284S 1 SE284B 1 SE284W 1 1 6 7 8 10 F20115H00AP F21314Y00XN F290D5Q00AP F393C6Z00CP COVER PULLY SHAFT ROLLER RING (U) DOOR HOOK (U) 1 1 1 1 14 15 F40016Z00AP F40085H00AP FAN MOTOR A FAN BLADE 1 1 16 17 18 20 F40256Z80AP F401W9D90AP F42486Z00AP F42505H00AP ORIFICE BLOWER MOTOR (U) FAN CASE C SIROCCO FAN C 1 1 1 1 21 22 23 24 25 F42676Z80AP F601L6F00AP F40246Z00AP F44775H00AP F20025H00AP FAN MOTOR B SENSOR (BU) EXHAUST GUIDE A EXHAUST GUIDE RACK SUPPORT 1 1 1 1 4 26 27 28 F65856Z00AP F62386Z00AP F62386F00AP INVERTER BRACKET WASHER WASHER 1 1 1 32 33 34 35 35 F100T5H00APG F400BBL60CP F400K5H00APG F63175H10BAP F63175H10HAP BACK PLATE (BU) FILTER (U) EXHAUST ADAPTER LAMP HOLDER LAMP HOLDER 1 2 1 1 1 36 37 38 39 40 F64375H00AP F41576Z00APG F42176Z00APG F42205H00APG F607V6Z00AP GLASS PLATE FAN INSTALLATION PLATE COVER PLATE COVER PLATE B LAMP COVER (U) 1 1 1 1 1 41 42 43 44 45 F61846Z00AP F6040BL60CP F61446Z00AP F20155H00AP F20165H00AP GROUNDING PLATE LAMP MEMBRANE STIRRER MOTOR STIRRER ANTENNA SUPPORT 1 1 1 1 1 51 52 53 54 55 F61456F20AP F61456N60AP F606Y9X90AP 2M261-M32JP F62308F20AP THERMAL CUTOUT THERMAL CUTOUT H.V.INVERTER (U) MAGNETRON FUSE 1 3 1 1 1 56 57 58 59 60 F400BBL70CP F607X9X00CP F82605H00AP F66986Z20AP F63266Z80AP CHARCOAL FILTER (U) NOISE FILTER (U) NOISE FILTER BRACKET MOTOR CAPACITOR TURNTABLE MOTOR 1 1 1 1 1 61 62 F900C9X00CP F90804W00AP AC CORD W/PLUG CANOE CLIP 1 1 22 Remarks FOR INVERTER (U) COOLING FOR INVERTER (U) COOLING FOR MAGNETRON COOLING SE284S,SE284B SE284W 20A/125V FOR COVER NN-SE284S / NN-SE284B / NN-SE284W Ref. No. 63 63 63 64 Part No. F101VBL60SCP F101V6Z30BAP F101V6Z30HAP F48436Z00APG Part Name & Description VENT GRILLE (U) VENT GRILLE (U) VENT GRILLE (U) INHALE GUIDE A Pcs/Set 1 SE284S 1 SE284B 1 SE284W 1 69 70 F01725H00AP F00565H00AP CAUTION LABEL CAUTION LABEL 1 1 72 73 F00725H00AP F0446BL70CP CAUTION LABEL FUNCTION LABEL 1 1 86 87 88 F90356Z00AP A66135H00AP F0334BL70CP AC CORD FIXING PLATE BRACKET A MENU LABEL 1 3 1 92 93 94 95 95 F40316Z00APG F00067C50CP F62315G10XN XTCHNE4+12BB XTCHNE4+12BC AIR BAFFLE C CAUTION LABEL FUSE HOLDER SCREW SCREW 1 1 1 4 4 96 96 99 100 TCTTH4+10BCB TCTTH4+10BC F605S9X00CP F67269X00CP SCREW SCREW D.P.CIRCUIT (HU) REFLECTOR 3 3 1 1 101 102 103 103 F81279X00CP F21559D90AP F612E-10G0 F612E-10H0 COOKTOP LAMP PANEL MEMBRANE OVEN LAMP (LED) OVEN LAMP (LED) 1 1 1 1 23 Remarks SE284S,SE284B SE284W SE284S,SE284B SE284W COOKTOP LAMP (LED) INSIDE SE284S SE284B,SE284W NN-SE284S / NN-SE284B / NN-SE284W 8.3. DOOR ASSEMBLY Ref. No. D1 D2 D2 D2 D3 D4 D5 Part No. F30186P40AG F302ABL60SCP F302ABL70BCP F302ABL70HCP F302K5H00AP F30215G10XN F30855H00AP Part Name & Description DOOR KEY A DOOR A (U) DOOR A (U) DOOR A (U) DOOR E (U) DOOR KEY SPRING DOOR C D6 D7 F31455H00AP F04114180CP DOOR SCREEN A HC LABEL Pcs/Set 1 1 SE284S 1 SE284B 1 SE284W 1 1 1 1 1 24 Remarks NN-SE284S / NN-SE284B / NN-SE284W 8.4. 8.4.1. ESCUTCHEON BASE ASSEMBLY NN-SE284S Ref. No. E1 E2 E3 E4 Part No. F603LBL60CP F603YBL60CP F800LBL60SCP F66166Z00AP Part Name & Description D.P.CIRCUIT (AU) D.P.CIRCUIT (DU) ESCUTCHEON BASE (U) FLAT CABLE Pcs/Set 1 1 1 1 E6 E7 E8 E10 F891PBL60SCP F82566F00AP F80375950AP F3316BL60CP DOOR OPENING BUTTON (U) DOOR OPENING LEVER COOK BUTTON SPRING GROUNDING PANEL 1 1 1 1 SE284S E11 F6616BL60CP FLAT CABLE 1 E12 E15 F6616BL70CP F0007BL60SCP FLAT CABLE NAME PLATE 1 1 SE284S (10 PIN) (FROM D.P.C. MU CN20 TO D.P.C. AU CN21) (8 PIN) (FROM D.P.C. MU CN19 TO D.P.C. AU CN18) SE284S E16 XTWBFE4+12P SCREW 1 SE284S 25 Remarks SE284S SE284S SE284S 25 PIN (FROM D.P.C. AU CN10 TO D.P.C. DU CN11) SE284S NN-SE284S / NN-SE284B / NN-SE284W 8.4.2. NN-SE284B, SE284W Ref. No. E21 E22 E23 E23 E24 E25 E25 Part No. F603LBL70CP F603YBL70CP F8034BL70BCP F8034BL70HCP F66166Z00AP F800BBL70BCP F800BBL70HCP Part Name & Description D.P.CIRCUIT (AU) D.P.CIRCUIT (DU) ESCUTCHEON BASE A ESCUTCHEON BASE A FLAT CABLE ESCUTCHEON BASE BU ESCUTCHEON BASE BU E26 E26 E27 E28 F8072BL70BCP F8072BL70HCP F82566F00AP F80375950AP DOOR DOOR DOOR COOK E32 E35 E35 F6616BL70CP F0007BL70BCP F0007BL70HCP E36 E36 XTWBFE4+12P XTWFNE4+12PW Pcs/Set 1 1 1 1 1 1 1 OPENING BUTTON OPENING BUTTON OPENING LEVER BUTTON SPRING Remarks SE284B,SE284W SE284B,SE284W SE284B SE284W 25 PIN (FROM D.P.C. AU CN10 TO D.P.C. DU CN11) SE284B SE284W 1 1 1 1 SE284B SE284W FLAT CABLE NAME PLATE NAME PLATE 1 1 1 (8 PIN) (FROM D.P.C. MU CN19 TO D.P.C. AU CN18) SE284B SE284W SCREW SCREW 1 1 SE284B SE284W 26 NN-SE284S / NN-SE284B / NN-SE284W 8.5. Ref. No. P1 P2 P2 P2 P3 P4 P5 PACKING AND ACCESSORIES Part No. F0003BL70CP F0102BL60SCP F0102BL70BCP F0102BL70HCP F01046Z20AP F01056Z20AP F01066Z20AP Part Name & Description INSTRUCTION MANUAL PACKING CASE, PAPER PACKING CASE, PAPER PACKING CASE, PAPER UPPER FILLER LOWER FILLER P.E.BAG Pcs/Set 1 1 SE284S 1 SE284B 1 SE284W 1 1 1 P6 P7 P8 P9 P10 F01075H00AP A06015H00AP F01175H00AP F01485H00AP F01085H00AP DOOR SHEET COOKING TRAY TRAY PACKING B REINFORCE BRACKET TRAY PACKING 1 1 1 2 1 P11 P11 P11 P12 P13 P14 P15 F01928Q00SAP F01926Z20AP F01925H00AP F06025H00AP F02185H00AP F03138Q00CP F04318Q00CP SHEET SHEET SHEET OVEN RACK PROTECTOR PACKING INSTALLATION INSTRUCTION UPPER-CABINET TEMPLATE 1 1 2 1 1 1 1 P16 P19 P19 33 F011F6Z00AP F011G6Z00AP F01569Y40CP F400BBL60CP ATTACHMENT ATTACHMENT B CAUTION SHEET FILTER (U) 1 1 1 2 27 SE284S SE284B SE284W Remarks NN-SE284S / NN-SE284B / NN-SE284W 8.6. WIRING MATERIALS Ref. No. W1 Part No. F030ABL60CP Part Name & Description LEAD WIRE HARNESS W2 W3 F030E5H00CP F03536F00AP H.V.LEAD WIRE LEAD WIRE HARNESS U W4 W5 F0355BL60CP F0354BL60CP LEAD WIRE HARNESS LEAD WIRE HARNESS W6 F03569X00CP LEAD WIRE HARNESS Pcs/Set Remarks 1 (Connect to Primary Interlock Switch, Interlock Monitor Switch, CN701 of H.V.Inverter, Stirrer Motor, Magnetron cooling Fan Motor, Inverter cooling Fan Motor, 3 Thermal Cutouts, Blower Motor, Noise Filter(U), D.P.C. RY1 etc.) 1 (Magnetron to CN702 of H.V.Inverter) 1 (INCLUDING 5 PIN CONNECTOR CN4) (Connect to Secondary Interlock Switch etc.) 1 (Connect to Turntable Motor & Cooktop Lamps etc.) 1 (Connect to Stirrer Motor, 3 Thermal Cutouts & Top oven lamp(LED) ) 1 (Connect to Noise Filter & Fuse) 28 NN-SE284S / NN-SE284B / NN-SE284W 9 DIGITAL PROGRAMMER CIRCUIT 9.1. SCHEMATIC DIAGRAM 29 NN-SE284S / NN-SE284B / NN-SE284W 30 NN-SE284S / NN-SE284B / NN-SE284W 9.2. PARTS LIST Ref. No. BZ210 C10 C11 C28 CX320 DISP110 DISP HOLDER D30 D32 ZD10,ZD11 ZD12 IC1 IC10 IC42 IC380 IC25,IC27 IC26 IC220 IC380 IC501 RL1 RL3-RL7 RL9 T10 Part No. L0DDEA000014 F2A1C471B626 F2A1C220B624 F2A1H1R0B574 H2A8004A0038 L5AYAYY00274 F6617BL60CP F67525E40XN B0EDKR000014 D4EAY2710001 DZ2J062M0L DZ2J068M0L MNBL6F29AAC C0DBGYY03746 B1HBGFF00007 C3EBDC000063 B3PAA0000302 MIP2K30MSSCF B1HBGFF00007 C3EBDC000063 C0ABBA000230 K6B1AYY00129 K6B1AGA00193 K6B1CGA00099 G4DYA0000326 Part Name & Description BUZZER AL CHEM CAPACITOR AL CHEM CAPACITOR AL CHEM CAPACITOR CERAMIC RESONATOR LCD LCD HOLDER DIFFUSION SHEET BRIDGE DIODE ZENER RESISTOR ZENER DIODE ZENER DIODE L.S.I. IC IC IC IC IC IC IC IC POWER RELAY POWER RELAY POWER RELAY LOW VOLTAGE TRANSFORMER 31 Pcs/Set 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 2 1 1 1 1 1 5 1 1 Remarks 2.0KHz 470µF/16V 22µF/16V 1µF/50V 8.0MHz 270V 120V 12/13 S-BL6 S-BL7 Printed in China