NN-SF564S / NN-SF564M 4 DESCRIPTION OF OPERATING SEQUENCE 4.1. Variable power cooking 4.3. Turbo defrost, Auto cook control When the Auto Control feature is selected and the [Start] pad is tapped: High Voltage Inverter Power Supply (U) controls output power 1.
NN-SF564S / NN-SF564M 5 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances, the microwave oven is a high voltage, high current device. It is free from danger in ordinary use, though extreme care should be taken during repair.
NN-SF564S / NN-SF564M Discharging the high voltage capacitors 5.6. Verification after repair WARNING 1. After repair or replacement of parts, make sure that the There is high voltage present with high current capabilities screws of the oven, etc. are neither loosen or missing.
NN-SF564S / NN-SF564M 6.2. Magnetron 6.3. Digital programmer circuit (D.P.C) & Membrane Switch 1. Steps same as disassembly of H.V. Inverter step 1 to step NOTE: 2. Remove 1 screw holding thermistor on magnetron. Be sure to ground any static electric charge built up on your body before handling the D.P.C.
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NN-SF564S / NN-SF564M 3. Disconnect connector CN701 from H.V. Inverter board. 4. Remove 6 screws holding D.P.C. board on escutcheon base. 5. Separate D.P.C board from tabs on the escutcheon base and remove D.P.C board. To replace membrane key board 6.
NN-SF564S / NN-SF564M 6.4. Low voltage transformer 6.5. Fan motor and/or power relays (RL1) 1. Disconnect 2 lead wires from fan motor terminals. 2. Remove 4 screws holding inverter reinforcement bracket A NOTE: on right heater panel & base plate respectively.
NN-SF564S / NN-SF564M 6.6. Door assembly 6.7. Stirrer motor 1. Remove door C from door E by carefully pulling outward, 1. Remove the motor cover by breaking off at the 8 spots starting from upper right hand corner using a flat blade indicated by arrows with a cutter or the like.
NN-SF564S / NN-SF564M 7 COMPONENT TEST PROCEDURE 7.3. Magnetron WARNING 1. High voltage is present at the output terminals of the High Voltage Inverter (U) including aluminum heat sink during any cook cycle. Continuity checks can only indicate an open filament or a 2.
NN-SF564S / NN-SF564M a. After approximately 3 seconds, oven stops operating. 7.4. Inverter power supply (U) b. During oven operation, input current DO NOT try to REPAIR H.V. Inverter power supply approximately 0.4A. (U).Replace complete H.V. Inverter(U) Unit. INPUT CURRENT...
NN-SF564S / NN-SF564M 8 MEASUREMENTS AND ADJUSTMENTS 8.1. Adjustment of Primary 8.2. Measurement of microwave interlock switch, Secondary output interlock switch and Short The output power of the magnetron can be determined by switch. performing IEC standard test procedures. However,due to the complexity of IEC test procedures, it is recommended to test 1.
NN-SF564S / NN-SF564M 9 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.
NN-SF564S / NN-SF564M 9.2. (Troubleshooting) Other problems SYMPTOM CAUSE CORRECTIONS 1. Oven is dead. 1. Open or loose lead wire harness Check thermal cutout is defective. Fuse is OK. 2. Open thermal cutout / thermistor No display and no operation at all.
NN-SF564S / NN-SF564M 9.3. 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.
NN-SF564S / NN-SF564M 9.4. Trouble related to Digital Programmer Circuit SYMPTOM STEP CHECK RESULT CAUSE/CORRECTIONS →Step2 No display when oven is first plugged Fuse pattern of D.P.C. Normal Open Replace D.P.C. or Fuse Pattern IC10 pin4 voltage Abnormal 0V IC25 →Step3...
NN-SF564S / NN-SF564M 9.5. 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.
NN-SF564S / NN-SF564M 9.6. How to check the semiconductors using an OHM meter 9.7. H.V.INVERTER BOARD MAIN PARTS LIST (F606Y9X90AP) Ref. No. Part No. Part Name & Description Pcs/Set Remarks DB701 B0FBCR000051 BRIDGE DIODE 25A,600V L701 F5020W100AP CHOKE COIL Q701...
NN-SF564S / NN-SF564M 10.2. 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.
NN-SF564S / NN-SF564M 10.4. DOOR ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks F30186P40AG DOOR KEY A F302ABN60SRP DOOR A(U) SF564S F302ABN50SQP DOOR A(U) SF564M F302K9Q30AP DOOR E(U) F30216P40AG DOOR KEY SPRING F30859Q30AP DOOR C F31459L70XP DOOR SCREEN A...