Related Manuals for Panasonic NN-C784MF
Summary of Contents for Panasonic NN-C784MF
- Page 1 ORDER NO.PHAMOS0805017C3 Microwave Oven NN-C784MF TTE (Indonesia) © 2008 Panasonic Home Appliances Microwave Oven (Shanghai) Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
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Page 4: Table Of Contents
NN-C784MF CONTENTS Page Page 1 SCHEMATIC DIAGRAM 5 COMPONENT TEST PROCEDURE 2 DESCRIPTION OF OPERATING SEQUENCE 5.1. Primary, Secondary Latch Switch interlocks & Power 2.1. Variable power cooking control Relay RY1 2.2. Inverter power supply circuit 5.2. Short switch & monitor 2.3. -
Page 5: Schematic Diagram
NN-C784MF 1 SCHEMATIC DIAGRAM... -
Page 6: Description Of Operating Sequence
NN-C784MF 2 DESCRIPTION OF OPERATING SEQUENCE 2.1. Variable power cooking 2.3. Turbo defrost, Auto cook control When the Auto Control feature is selected and the Start button is tapped: High Voltage Inverter Power Supply (U) controls output power 1. The digital programer circuit determines the power level and by the signal from Digital Programmer Circuit (DPC). -
Page 7: Sensor Reheat
NN-C784MF 2.6. Steam sensor and digital Explanation of the Auto Sensor Cooking process 1. During the first 10 second period there is no microwave programmer circuit activity. When calculating the T2 time by using the formula below make sure this 10 seconds is subtracted In order to determine if the steam sensor function of the digital from the T1 time. -
Page 8: Combination Cooking
NN-C784MF 2.8. Combination Cooking Combination cooking is accomplished by microwave and convection cooking being done alternately during one combination cooking cycle. One combination cooking cycle is 22 seconds. 1. During combination cooking, the digital programmer circuit controls ON-OFF time of both power relay RY1 and RY4 as shown in Figure. -
Page 9: Cautions To Be Observed When Troubleshooting
NN-C784MF 3 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. CAUTION Servicemen should remove their watches whenever working close to or replacing the magnetron. -
Page 10: Part Replacement
NN-C784MF 3.6. Verification after repair Discharging the high voltage capacitors 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. -
Page 11: Disassembly And Parts Replacement Procedure
NN-C784MF 4 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 4.1. Magnetron CAUTION When replacing the magnetron, be sure the antenna gasket is in place. 1. Discharge the high voltage capacitors. 2. Remove a screw holding magnetron on bracket. NOTE Magnetron used for this model is unique type for inverter power 3. -
Page 12: Inverter
NN-C784MF 3. Remove 3 screws holding H.V. Inverter board and fan motor assembly. 4.3. H.V. Inverter 4. Unplug 3 connectors of H.V. Inverter board. 1. Discharge high voltage remaining in voltage capacitor. 5. Remove 2 screws holding H.V. Inverter board onto bracket. -
Page 13: Door Assembly
NN-C784MF To remove door E 8. Remove screws holding door E to door A assembly. NOTE: Do not pull by lead wires but make sure to pull housing unless PCB or lead wire may break. 4.4. Door assembly 1. Remove left and right door key spring from door arm with plier. -
Page 14: Turntable Motor
NN-C784MF 11. Always perform the microwave leakage measurement test 4.6. Heater after installation and adjustment of door assembly. 1. Remove belt. 2. Disconnect 2 lead wires from heater terminals. 3. Remove 2 screws holding heater fan case and oven temperature sensor. -
Page 15: Steam Sensor
NN-C784MF 4.7. Steam sensor 1. Remove one screw holding steam sensor unit. 2. Disconnect connector CN2 from digital programmer circuit board. 3. Disengage catch hooks on sensor cover C from orifice. 4. Remove steam sensor from orifice. NOTE: When installing the steam sensor, make sure that... -
Page 16: Component Test Procedure
NN-C784MF 5 COMPONENT TEST PROCEDURE 5.3. 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. -
Page 17: Inverter Power Supply (U)
NN-C784MF 5.4. Inverter power supply (U) 5. Program oven at High power for 1 minute and press [Start] button. DO NOT try to REPAIR H.V. Inverter power supply (U). a. After approximately 3 seconds, oven stops operating. Replace complete H.V. Inverter(U) Unit. -
Page 18: Measurements And Adjustments
NN-C784MF 6 MEASUREMENTS AND ADJUSTMENTS 6.1. Adjustment of primary latch 6.2. Measurement of microwave switch, secondary latch switch output and short switch. The output power of the magnetron can be determined by performing IEC standard test procedures. However,due to the 1. -
Page 19: Troubleshooting Guide
NN-C784MF 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. -
Page 20: Troubleshooting) Other Problems
NN-C784MF 7.2. (Troubleshooting) Other problems SYMPTOM CAUSE CORRECTIONS 1. Oven is dead. 1. Open or loose lead wire harness Fuse is OK. 2. Open thermal cutout / thermistor Check thermal cutout is defective. No display and no operation at all. -
Page 21: Trouble Related To Digital Programmer Circuit
NN-C784MF 7.3. 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 Low voltage transforment (L.V.T.) Abnormal 0V L.V.T. secondary voltage →Step3... -
Page 22: Troubleshooting Of Inverter Circuit (U) And Magnetron
NN-C784MF 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. -
Page 23: Simple Way Of H.v. Inverter/Magnetron Troubleshooting
NN-C784MF 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. -
Page 24: Inverter Main Parts List (F606Y4V00Xn)
NN-C784MF 7.7. H.V. INVERTER MAIN PARTS LIST (F606Y4V00XN) Ref. No. Part No. Part Name & Description Pcs/Set Remarks Q701 TRANSISTOR SI A691E4V10GP Q702 TRANSISTOR SI DB701 AESTRS2006M DIODE SI 20A,600V D701,D702 A62024V00GP DIODE SI 0.3A C704,C705 ECWH30822JUA CAPACITOR 8200PF 3000VDC... -
Page 25: Exploded View And Parts List
NN-C784MF 8 EXPLODED VIEW AND PARTS LIST 8.1. EXPLODED VIEW... -
Page 26: Parts List
NN-C784MF 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. -
Page 27: Wiring Materials
NN-C784MF Ref. No. Part No. Part Name & Description Pcs/Set Remarks F48804X80MNG INSULATION PLATE F22364X80MNG RIGHT HEATER PANEL F203M4X80MN HEATER FAN CASE F22395850AP HEATER FAN F41325850AP PULLEY B F41575850AP FAN BRACKET A F41585850AP FAN BRACKET B F41635850AP FAN SPACER C... -
Page 28: Door Assembly
NN-C784MF 8.4. DOOR ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks F301P4J00XN DOOR E(U) F3044-1640 RIGHT DOOR ARM F30854J00XN DOOR C F3252-1450 DOOR ARM SPACER XTNFA3+7Q SCREW F3054-1640 LEFT DOOR ARM F3230-1600 DOOR KEY SPRING B F302A6V50SHP... -
Page 29: Escutcheon Base Assembly
NN-C784MF 8.5. ESCUTCHEON BASE ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L5G00TN D.P. CIRCUIT F630Y6V50SHP MEMBRANE SWITCH F80346V50SHP ESCUTCHEON BASE F81274J00XN BACK PANEL F80025G00XN ESCUTCHEON B F82844J00XN CUSHION RUBBER... -
Page 30: Packing And Accessories
NN-C784MF 8.6. PACKING AND ACCESSORIES Ref. No. Part No. Part Name & Description Pcs/Set Remarks F00036V50HP INSTRUCTION MANUAL F000B6V50HP COOKING GUIDE F01026V50SHP PACKING CASE,PAPER F01044J00XN UPPER FILLER F01054J00XN LOWER FILLER F01064W00AP P.E. BAG F01078100XN DOOR SHEET F01084J00XN TRAY PACKING A06014J00XN... -
Page 31: Digital Programmer Circuit
NN-C784MF 9 DIGITAL PROGRAMMER CIRCUIT 9.1. SCHEMATIC DIAGRAM... - Page 32 NN-C784MF...
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Page 33: Parts List
NN-C784MF 9.2. PARTS LIST Ref. No. Part No. Part Name & Description Pcs/Set Remarks BZ310 AEFBAT2001 BUZZER 2.0KHz AECETK1V471B AL CHEM CAPACITOR 470µF/16V AECETS1C220B AL CHEM CAPACITOR 22µF/16V AECETK2W100B AL CHEM CAPACITOR 10µF/450V/105°C C481 AECETS1H010B AL CHEM CAPACITOR 1µF/50V C482...