Panasonic NN-A872SBBPQ Service Manual Download Page 1

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Order Number: MOP02090053S2

Microwave Oven

NN-A872SBBPQ

32l Enamel

Stainless Steel

United Kingdom

Please file and use this manual together with the service manual for
Model Nos. NN-A850CB, Order Number MOP0090015C2

SPECIFICATIONS

1995 Matsushita Electric Industrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation of law.

Summary of Contents for NN-A872SBBPQ

Page 1: ...Steel United Kingdom Please file and use this manual together with the service manual for Model Nos NN A850CB Order Number MOP0090015C2 SPECIFICATIONS 1995 Matsushita Electric Industrial Co Ltd All ri...

Page 2: ...fied by the symbol have special safety characteristics only replace these parts with parts supplied by the original manufacturer For parts not shown in this simplified service manual refer to the serv...

Page 3: ...Ref No Part No Part Name Description Qty Remarks D1 E302A4V30SBP DOOR A SCREEN B FACIA ASSEMBLY 1 3 ESCUTCHEON BASE ASSEMBLY 3...

Page 4: ...ef No Part No Part Name Description Qty Remarks E1 E80724V30SBP DOOR OPENING BUTTON 1 E2 AEE80378A1AG DOOR OPENING BUTTON SPRING 1 E3 E800S4V30SBP ESCUTCHEON BASE ASSEMBLY 1 4 PACKING AND ACCESSORIES...

Page 5: ...Ref No Part No Part Name Description Qty Remarks P3 E06435870SP WIRE RACK FOOT 1 P4 E060V5870SP WIRE RACK 1 P5 E01089000GP TRAY PACKING 1 P11 E00034V30BT COOKBOOK OPERATING INSTRUCTIONS 1 5...

Page 6: ...Number MOP00090015C2 Microwave Oven NN A880WB NN A850WB NN A850CB SPECIFICATIONS 1995 Matsushita Electric Industrial Co Ltd All rights reserved Unauthorized copying and distribution is a violation of...

Page 7: ...shock High voltages may remain in the circuit 2 Do not touch the aluminium heat sink as it will become very hot It also contains high voltages 3 Do not attempt to repair the inverter PCB as this can b...

Page 8: ...Inverter Gounding Figure 2 Inverter PCB layout 2 Feature Chart 3...

Page 9: ...eheat 2 Sensor cook 2 Sensor combination 4 Weight defrost 3 3 Weight combination 8 12 Weight reheat 2 Weight cook 2 Stage cooking 3 3 Delay Stand YES YES More Less YES NO Kg lb oz YES YES Clock 12H 12...

Page 10: ...4 Operation And Digital Programmer Circuit Test Procdure 5...

Page 11: ...6...

Page 12: ...7...

Page 13: ...5 Schematic Diagram 8...

Page 14: ...ly power to the inverter circuit The level of output power is controlled by the drive signal level from the inverter circuit NOTE1 The ON OFF time ratio does not correspond with the percentage of micr...

Page 15: ...rt pad pressed 1 The digital programmer circuit determines the power level and the cooking time and indicates the operating state in the display The table shows the corresponding cooking times for eac...

Page 16: ...Whole Chicken 1000 18m 20s 8 Chicken Portions 300 9m 30s 9 Beef Lamb 500 14m 40s 10 Casserole 800 56m 40s 11 Chilled Crispy Top 300 10m 12 Frozen Crispy Top 300 14m 13 Chilled Pizza 200 7m 40s 14 Froz...

Page 17: ...igital programmer circuit stops supplying power to relay RY5 resulting in the convection heater turning off During this time the digital programmer circuit continues to operate relay RY1 so that micro...

Page 18: ...opower ON OFF OUTPUT ON OFF Grill 1 66 0 Medium 600W 66 0 Grill 2 48 18 Low 440W 66 0 Grill 3 36 30 Simmer 440W 45 21 Warm 440W 24 42 Grill Convection And Microwave Combination Duty Cycles Convection...

Page 19: ...Convection and microwave duty cycles Figure 2 Grill and microwave duty cycles 14...

Page 20: ...th of time it will take to cook the food 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 it...

Page 21: ...reased or decreased Calculating the T2 time Example 1 If the t1 time is measured to be 2 minutes and 40 seconds and the auto sensor program is selected is sensor reheat Fish Program 4 T2 T1 x K 2 min...

Page 22: ...o this high current and high voltage The aluminium heat sink is also energized with high voltage HOT so do not touch when the AC input terminal is connected The power devices Collector is directly con...

Page 23: ...al of the magnetron filament terminals to the chassis ground with an insulated handle screwdriver to discharge Please be sure to touch the chassis ground side first and then short to the output termin...

Page 24: ...the appropriate rating for these models 3 When replacing faulty switches be sure the mounting tabs are not bent broken or deficient in their ability to hold the switches 8 5 Avoid inserting nails wir...

Page 25: ...ase use caution when unpacking installing or moving the unit as some exposed edges may be sharp to touch and cause injury if not handled with care 9 Parts Replacement Procedure 9 1 Magnetron 1 Dischar...

Page 26: ...Discharge the high voltage capacitors 2 Unplug the H V Lead wires from the magnetron 3 Remove the connector CN701 and CN702 from the inverter PCB 4 Remove the two screws holding the inverter base to...

Page 27: ...sure that grounding plate is in place 2 Securely tighten the grounding screw through the side of the chassis Base 3 Securely connect the 3 lead wire connectors 4 Make sure that the heat sink has enoug...

Page 28: ...he escutcheon base by freeing the 4 catch hooks on the escutcheon base 2 Peel away the display window from the inside of the base 3 Remove the membrane assembly by pushing from the inside of the base...

Page 29: ...t the terminal pins are inserted completely Carefully re solder all terminal contacts carefully Note Do not use a soldering iron or de soldering tool of more than 30 watts on DPC contacts 9 5 Fan Moto...

Page 30: ...f the door reassemble it and follow the instructions below for proper installation and adjustment so as to prevent excessive microwave leakage 1 When mounting the door to the oven be sure to adjust th...

Page 31: ...d wires connected to the turntable motor 3 Remove the turntable motor by removing the two screws Note After breaking off the motor cover make sure that cut off portions are properly trimmed off or ben...

Page 32: ...emove the grill cover by removing the 5 screws in figure 11 5 Remove the two screws holding the grill heater Figure12 6 Loosen the 2 screws holding the ceramic grill holders turn the holders to releas...

Page 33: ...crews Figure 13 3 Remove the temperature sensor by removing the two screws Figure 14 4 Remove the power cord 5 Remove the wire terminals from the circulation fan motor and the convection heater elemen...

Page 34: ...10 Remove the convection element by removing the two screws Figure 16 Figure 13 Removing the rear heater cover Figure 14 29...

Page 35: ...Removing the oven back plate Figure 15 Removing the base plate Figure 16 30...

Page 36: ...empt to measure this high voltage 3 Before touching any oven components or wiring always unplug the oven from its power source and discharge the high voltage capacitors 10 1 Primary Latch Switch Secon...

Page 37: ...terminals 2 Connect the test probes of the ohm meter to these leads 3 Test the continuity of the short switch with the door open and the door closed using the lowest ohm scale Door Open Door Closed Mo...

Page 38: ...keypad matrix is shown on 10 5 Inverter Power Supply Caution DO NOT try to repair this inverter power supply Replace as a whole H V Inverter Unit Figure 3 Inveter power supply diagram 10 6 Inverter Po...

Page 39: ...s the sensor heater terminals Normal cold resistance should read approximately 4 5 ohms 2 Check the volatge across the sensor heater terminals It should read approximately 2 5VDC 3 In order to determi...

Page 40: ...en the screws holding the door hook assembly to the oven assembly 3 Reconnect the short switch primary switch and secondary latch switches and check the continuity of the monitor circuit and latch swi...

Page 41: ...al temperature rise at the high power position for each model is shown in the table Figure 2 Figure 1 Adjustment of latch switch assembly RATED OUTPUT TEMPERATURE RISE 1000W 8 C 12 Troubleshooting Gui...

Page 42: ...37...

Page 43: ...Fuses are not blown 38...

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Page 46: ...Other problems Inverter circuit troubleshooting Alternative method for toubleshooting the inverter circuit 13 Digital Programmer Troubleshooting Guide 41...

Page 47: ...42...

Page 48: ...How to check semiconductors 14 Exploded View 43...

Page 49: ...s Please use these part numbers for part orders Do not use the description of the part Important safety notice 1 Components identified by mark have special characteristics important for safety When re...

Page 50: ...39000BP ADIABATIC MATERIAL A 1 24 E40474V00BP AIR GUIDE E 1 25 E09020000AK CUSHION RUBBER 1 26 E40309000GP AIR GUIDE D 1 27 E030E4V20BP HV LEAD WIRE 1 28 E606Y4V20GP INVERTER 1 29 E66014V00BP INVERTER...

Page 51: ...GUIDE A 1 63 E202N9000BP UPPER HEATER COVER 1 64 E64179000BP HEATER BRACKET A 1 65 E67579000BP HEATER BRKT D 1 66 E630H9000BP CONVECTION HEATER 1 67 E64189000BP HEATER BRACKET B 1 68 E607F9000BP HEATE...

Page 52: ...DOOR A ASSYM 1 NN A850CB D2 E30214000AP DOOR KEY SPRING 1 D3 E30188000BP DOOR KEY A 1 D4 E302K9000BP DOOR E 1 D5 E30859000BP DOOR C 1 D6 E30067300AP HINGE 1 When ordering any door component also order...

Page 53: ...0BP P C B AU 1 NN A880WB E5 E603L4V30BP P C B AU 1 NN A850WB NN A850CB E6 E6629 1600 RIBBON CABLE 1 E7 E82564V20BP DOOR OPENING LEVER 1 E8 E603Y4V20BP P C B DU 1 NN A880WB E8 E603Y4V30BP P C B DU 1 NN...

Page 54: ...49...

Page 55: ...P13 E01136700BP TRAY STYROL 1 P14 E01024V20HBP CARTON BOX 1 NN A880WB P14 E01024V30HBP CARTON BOX 1 NN A850WB P14 E01024V30BP CARTON BOX 1 NN A850CB P15 E01059000BP LOWER FILLER 1 P16 E01069000BP COV...

Page 56: ...No 1 Set Side strip REF No 2 Set Microwave Oven Model Number NN TKA80W E1603A510HBP 1 E1601A540HBP 1 NN A880WB NN A850WB NN TKA80C E1603A510BP 1 E1601A540BP 1 NN A850CB Instalation Guide A0003A810BP...

Page 57: ...52...

Page 58: ...22 Key Board Matrix 53...

Page 59: ...23 Digital Programmer Circuit Parts 23 1 E603L4V20BP E603L4V30BP DPCAU 54...

Page 60: ...Resistor 1 1 1 R502 AERJ3GSYJ272 2 7K Chip Resistor 1 0 R137 R141 AERJ3GSYJ331 330 Chip Resistor 5 0 R514 AERJ3GSYJ364 360K Chip Resistor 1 0 R331 AERJ3GSYJ471 470 Chip Resistor 1 1 R224 R225 AERJ3GSY...

Page 61: ...CKTC3199GR NPN Transistor 3 3 C10 EEUFC1C471B 470uF 16 V Elect Capa 1 1 C12 EEUFC1C471B 470uF 16 V Elect Capa 1 0 C12 ECEA1CKA100B 10uF 16V Electrolytic Capacitor 0 1 R27 ERX12SJ1R0E 1R 1 2 Watt Resis...

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