Panasonic NN-A771SB Service Manual
  1. Manuals
  2. Brands
  3. Panasonic Manuals
  4. Microwave Oven
  5. NN-A771SB
  6. Service manual
Panasonic NN-A771SB Service Manual

Panasonic NN-A771SB Service Manual

27l stainless epg for continental europe, inverter system inside
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Order Number MOP0109035C2
Microwave Oven
NN-A771SB
27L
STAINLESS
EPG For Continental Europe
SPECIFICATIONS
2001 Matsushita Electric Industrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation of law.
1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the NN-A771SB and is the answer not in the manual?

Questions and answers

Related Manuals for Panasonic NN-A771SB

Summary of Contents for Panasonic NN-A771SB

  • Page 1 Order Number MOP0109035C2 Microwave Oven NN-A771SB STAINLESS EPG For Continental Europe SPECIFICATIONS 2001 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.

  • Page 2: Inverter Warning

    1. Inverter Warning The inverter board looks like a regular PCB, however, this PCB drives the magnetron tube using very high voltages and current. It has 1. Very high voltage and high current 2. An Aluminium heat sink that becomes very hot 3.

  • Page 3: Feature Chart

    Inverter Power Supply Diagram Figure 2 Inverter Layout 2. Feature Chart Function Microwave Grill Convection Combination Weight Defrost Weight Combination Weight Reheat Weight Cook Stage Cooking 3 Stage Delay / Stand Clock 24 Hour Word Prompt None, French, Dutch, English. 3.

  • Page 4: Operation And Digital Programmer Circuit Test Procedure

    4. Operation And Digital Programmer Circuit Test Procedure 4.1. Word Prompting 4.2. Setting The Clock...
  • Page 5 4.3. Child Safety Lock 4.4. Microwave Cooking 4.5. Grill Operation 4.6. Convection Operation 4.7. Grill and Convection...
  • Page 6 4.8. Combination Cooking (Grill And Microwave) 4.9. Combination Cooking (Convection And Microwave) 4.10. Combination Cooking (Grill/Convection And Microwave) 4.11. Auto Weight Defrost 4.12. Auto Weight Cook Programs...

  • Page 7: Schematic Diagram

    4.13. Delay Start 4.14. Delay Stand 5. Schematic Diagram...

  • Page 8: Wiring Diagram

    6. Wiring Diagram 7. Description of Operating instruction 7.1. Variable power cooking control The HIGH VOLTAGE INVERTER POWER SUPPLY controls the output power by a signal from the Digital Programmer Circuit (DPC). The power relay (RY1) turns on to supply power to the inverter circuit.

  • Page 9: Grill Cooking

    Duty cycles for microwave cooking Output Duty ON/OFF ON time OFF time High 1000W 22” 0” Defrost 440W 16” 6” Medium 600W 22” 0” 440W 22” 0” Simmer 440W 15” 7” Warm 440W 8” 14” 7.2. Grill Cooking The DPC controls the grill power by operating the power relay RY4 in the sequence shown in the table below Duty cycles for Grill Cooking Duty ON/OFF...
  • Page 10 Category 1st Touch Cooking Weight Time Reheat Meal 500g 3m 35 sec Fresh fish 300g 4 min Fresh Vegetables 500g 12 min 30 Whole Chicken 1000g 16 min 40 Beef 800g 23 min 26 Pork/Veal 1000g 28 min 20 Lamb 1200g 28 min 16 Pizza...

  • Page 11: Combination Cooking

    Convection Cooking Duty Cycles 7.5. Combination Cooking Combination cooking is achieved by operating the microwave and heater modes together during one cooking cycle. There are three combination modes. 1. Combination (convection and microwave) 2. Combination (grill and microwave) 3. Combination (grill, convection and microwave) The digital programmer circuit operators the power relays as shown in the figures below.
  • Page 12 Convection Heater Micropower 100 - 250 C OUTPUT ON Medium 600W 440W Simmer 440W Warm 440W Grill And Microwave Combination Duty Cycles Grill Heater Micropower OUTPUT ON Grill 1 Medium 600W Grill 2 440W Grill 3 30 Simmer 440W Warm 440W Grill Convection And Microwave Combination Duty Cycles Convection Grill Heater...
  • Page 13 Convection And Microwave Duty Cycles Figure 2 Grill and Microwave Duty Cycles Figure 3...

  • Page 14: Cautions To Be Observed When Troubleshooting

    Grill, Convection And Microwave Duty Cycles 8. Cautions to Be Observed When Troubleshooting Unlike many other appliances, the microwave oven is a high voltage, high current is device. Though it is free from danger in ordinary use, extreme care should be taken during repair. Caution Servicemen should remove their watches whenever working close to or replacing the magnetron.
  • Page 15 Figure 1 HV Inverter warning WARNING FOR INVERTER POWER SUPPLY (U) GROUNDING Check the high voltage inverter power supply circuit grounding. This high voltage inverter power supply circuit board must have a proper chassis ground, the inverter grounding bracket must be connected to the chassis.
  • Page 16 Discharging the high voltage capacitors WARNING There is high voltage present with high current capabilities in the circuits of the primary and secondary windings, choke coil and heat sink of the inverter. It is extremely dangerous to work on or near these circuits with the oven energized.

  • Page 17: Parts Replacement Procedure

    8.5. 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. 8.6.
  • Page 18 9.1. Magnetron 1. Discharge the high voltage capacitors on the inverter circuit. 2. Remove the screw holding the air guide 3. Remove the two screws holding the tie bar 4. Remove the oven lamp and lead wire harness cables form the air guide A.
  • Page 19 5. Remove the connector CN701 and CN702 from the inverter PCB 6. Remove the two screws holding the inverter base to the chassis (See figure 2) 7. Carefully remove the inverter PCB and support base from the oven. 8. Remove the air guide E by un-clipping the catch hooks 9.
  • Page 20 Disconnecting the PCB lock connector 9.3. Digital Programmer Circuit (DPC) and membrane key board. NOTE: Ground any static electric built up on your body before handling the DPC. 1. Disconnect all connectors from the DPC. 2. Remove the two screws holding the escutcheon base and slide the escutcheon base upward slightly.
  • Page 21 3. When replacing the stainless escutcheon sheet ensure that the escutcheon sheet is earthed to the back-plate via the earth spring. Figure 4 Removal of DPC AU and DPC DU Figure 5 Grounding of the Stainless escutcheon 9.4. Low voltage transformer and/or power relays (RY1) Note Be sure to ground your body to discharge any static before handling the DPC.
  • Page 22 watts on DPC contacts 9.5. Fan Motor 1. Remove two screws and remove the tie bar 2. Disconnect the two lead wires from the fan motor terminals 3. Disconnect all lead wires from the noise filter 4. Remove the noise filter 5.
  • Page 23 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 the door parallel to the bottom line of the oven face plate by moving the upper hinge in the direction necessary for proper alignment.

  • Page 24: Quartz Heater

    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 bent inside so that no sharp edges are exposed. Note: To secure the motor cover use a 4 x 6 screw. Figure 9 Removing the turntable motor cover Figure 10...
  • Page 25 One screw to remove the grill bracket Figure 12 Removing the grill element 9.9. Convection Element And Circulation Fan Motor 1. Remove the four screws A holding the rear heater cover. 2. Remove the wire terminals from the thermal cutout, circulation fan motor and the convection elements.

  • Page 26: Component Test Procedure

    8. Remove the three screws F to release the circulation fan motor assembly. Figure 13 Disassembly of the rear convection assembly 9.10. Temperature Sensor 1. Remove lead wire plug from connector CN7 2. Remove 1 screw holding temperature sensor 3. Replace temperature sensor and lead wire as a complete unit. Figure 14 Removing the temperature sensor unit 10.
  • Page 27 Caution 1. High voltage is present at the high voltage terminal of the inverter unit, including the aluminium heat sink. 2. It is not necessary or advisable to attempt 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.

  • Page 28: Push Button Keyboard

    Continuity checks can only indicate an open filament or a shorted magnetron. To diagnose an open filament or shorted magnetron. 1. Isolate the magnetron from the circuit by disconnecting the HV leads 2. A continuity check across the magnetron filament terminals should indicate one ohm or less 3.

  • Page 29: Measurements And Adjustments

    Figure 3 10.6. Inverter Power Supply Unit Warning Do not attempt to make any measurements in the high voltage circuitry of the inverter or magnetron. See troubleshooting of the inverter circuit and magnetron on Figure 4 to determine if the inverter power supply is still functioning.
  • Page 30 ability to hold the switches. - Refer to the schematic and wiring diagram to ensure proper connection 11.1. Installation of primary latch switch, secondary latch switch and short switch. 1. When mounting the primary latch switch, secondary latch switch and short switch to the door hook assembly. Follow the instructions in figure 1.

  • Page 31: Troubleshooting Guide

    4. The normal 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 guide Caution 1. Do not try to repair this H.V. Inverter power supply. Replace as a whole unit.
  • Page 32 6. When checking the continuity of the switches on the H.V. inverter, disconnect one lead wire from these parts and then check the continuity with the AC plug removed. To do 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 and not the lead wire, otherwise the lead wire may become open circuit.
  • Page 33 Troubleshooting (Fuse is blown) Figure 3 Troubleshooting (Other problems) Troubleshooting of the Inverter circuit and magnetron Oven shuts down between 15 - 33 seconds. If the microwave oven shuts down after a short period of time while operating in micropower mode, conduct the following test.
  • Page 34 Troubleshooting Inverter by input voltage Alternative way to troubleshooting oven with AC ampere meter used Oven shuts down between 15 - 33 seconds. If the microwave oven shuts down after a short period of time while operating in micropower mode, conduct the following test. The microwave oven must be set in self test mode to activate the self diagnostic failure code system.
  • Page 35 Troubleshooting Inverter by Microwave Oven Input Current 13. Digital Programmer Circuit Troubleshooting Guide...

  • Page 36: Main Parts List

    Figure 2 How to test the semiconductors 14. Main Parts List...
  • Page 37 1. Part numbers are indicated on most mechanical parts. 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 replacing any of these components, use only the manufacturers specified parts.
  • Page 38 Ref. No. Part number Description Remarks E09020000AA Cushion Rubber E20994N30BP Reinforcement Bracket A E40254N40GS Air Guide A E610T6700BP Lamp Assembly E22364V00BP Right Hand Heater Panel XTW4 +12T Screw E31374830AP Hook Spacer B E31384830AP Hook Spacer C E61425180AP Secondary Latch Switch L-3C2-2 E61785180AP Short Switch...

  • Page 39: Exploded View

    Ref. No. Part number Description Remarks XTWANE 4+8BN Screw E09230000AL Cushion Rubber XTWANE 4+8BN Screw E605A-1960 Thermistor E900C5872GP Power cord E030E4N30BP H.V Lead Wire E90314V00BP Holder E90314V00BP Holder E67579000BP Heater bracket D E22784V00SBP Heater Cover E01504V00SBP Warning label E66224L00GS Outer Panel Spacer 15.

  • Page 40: Escutcheon Base

    Ref. No. Part number Description Remarks E302A4V00SEP Door A Assembly E30214000AP Door Key Spring E30184L00GS Door Key E302K4V00BP Door E E30854V00BP Door Screen C NOTE: When ordering any Door component also order door C as this part may become damaged during disassembly.

  • Page 41: Packing And Accessories

    Ref. No. Part number Description Remarks E800S4V00SEP Escutcheon Assembly E80074L00SGS Spring E80725D00SBP Door opening button E80378A0AG Door button spring E81274V00SBP Back plate E603L4V00EP DPC AU E66164L00GS Ribbon cable E82564V00SBP Door opening lever E603Y4V00BP DPC DU E60704V00SBP Insulation sheet E83264V20BP Display sheet E00074V00EP Name plate NOTE: Please order the escutcheon base and name plate together...

  • Page 42: Digital Programmer Circuit

    Ref. No. Part number Description Remarks E06435870GS Rubber foot E060V8020BP Wire rack low E06435870GS Rubber foot E060V6520UP Wire rack high E01084V00GP Tray packing E06014N30BP Glass tray E06015020UP Enamel tray E290D4N00BP Roller ring E01695750BP Service center list E00034V00EP Operating instructions and cook book E01134N30BP Tray styrol E01024V00BP...
  • Page 43 DPC Schematic 1...

  • Page 44: Key Board Matrix

    DPC Schematic 2 20. Key Board Matrix...

  • Page 45: Digital Programmer Circuit Parts List

    21. Digital programmer circuit parts list 21.1. E603L4V00EP DPC AU...
  • Page 46 Ref. No. Part number Description Remarks R180 ERDS2TJ361T Carbon Resistor 360R D40,D41 AESS133T-77 Diode D180-D182 AESQTLGE260T Green LED CX320 EFOMC8004T4 Ceramic Resonator SW40-SW63 EVQ11L05R Push Switch C110,C20,C40-C48,C441 AECU1F103Z50 Chip Capacitor 10nF C220,C22,C222,C224,C22 AECU1F104Z25 Chip Capacitor 100nF R111-113,R20,R442 AERJ3GSYJ102 Chip Resistor R340 AERJ3GSYJ103 Chip Resistor...
  • Page 47 Ref. No. Part number Description Remarks AEEM19FEBVKN 19 Pin Connector AEEMXD55511W 11 Pin Connector IC25 AEICP25011HL Photocoupler IC AESTS1WBA60B Diode Bridge (600V) ECA2WHG100E Electrolytic Capacitor 10uF 450V BZ310 EFBAH20C001 2KHz Buzzer D2,D3 ERZV10D112C1 Varistor 1100V ERZV10D511CS Varistor 510V IC10 ETXMJ197X1BG Switching Power Supply...

Table of Contents