Table of Contents
Troubleshooting
Related Manuals for Panasonic NN-A883WB
Summary of Contents for Panasonic NN-A883WB
- Page 1 MOP0307006C2 Microwave Oven NN-A813AB / NN-A873SB / NN-A883WB 32 Litre EPG Europe SPECIFICATIONS 1995 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
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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 Gounding Figure 2 Inverter PCB layout 2. Feature Chart Function A813ABEPG Microwave Grill Convection Combination Sensor reheat Sensor cook Sensor combination Weight defrost Weight combination Weight reheat Weight cook Stage cooking Delay/Stand More/Less Kg-> lb/oz Clock Word prompt English Step by Step... - Page 4 3. Control Panel 4. Operation And Digital Programmer Circuit Test Procdure...
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Page 7: Schematic Diagram
5. Schematic Diagram... -
Page 8: Wiring Diagram
6. Wiring Diagram 7. Description of Operation 7.1. Variable cooking power 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 minute after cooking to cool the oven and its electrical components. / Duty Cycles for Microwave Cooking OUTPUT DUTY ON/OFF (watts) (seconds) ON time OFF time HIGH 1000 DEFROST MEDIUM SIMMER WARM 7.2. Grill Cooking The Digital Programmer Circuit controls the grill powerby operating the power relay RY4 in the sequence displayed in the table below: Duty Cycles for Grill Cooking DUTY ON/OFF (seconds)
- Page 10 Auto Weight Cook CATEGORY 1st TOUCH COOKING TIME WEIGHT (Grams) Chilled Pizza 08m 20s Frozen Pizza 08m 40s Chilled Quiche 400 12m 40s Frozen Quiche 12m 40s Chicken Pieces 500 14m 40s Chicken Whole 1300 23m 55s Pork / Veal 1200 35m 00s Beef...
- Page 11 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 possible combination modes: 1. Convection and Microwave 2. Grill and Microwave 3. Convection, Grill and Microwave The Digital Programmer Circuit operates the power relays as shown in the figures below.
- Page 12 Grill and Microwave Combination Duty Cycles GRILL HEATER MICROPOWER Output (seconds) (seconds) Grill 1 Medium Grill 2 Grill 3 30 Simmer Warm Grill, Convection and Microwave Combination Duty Cycles GRILL HEATER MICROPOWER CONVECTION HEATER 100 - 250 C Output (seconds) (seconds) Grill Medium 600...
- Page 13 Grill and Microwave Duty Cycles Grill, Convection and Microwave Duty Cycles 7.6. One Touch Auto Sensor Cooking Auto Sensor Cook is a revolutionary way to cook by Microwave without setting a power level or selecting a time. It is only necessary is to select an auto sensor program before starting to cook. Understanding Auto Sensor Cooking As food cooks, a certain amount of steam is produced.
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Page 14: Cautions To Be Observed When Troubleshooting
leveland calculate the lengh of time it will take to cook the food. NOTE: Auto Sensor Cooking is 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 using the power select and time features. - Page 15 The aluminium heat sink may be (HOT) due to heat energy, therefore, extreme care should be taken during servicing. 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 screwdriver to discharge. Please be sure to touch the chassis ground side first and then short to the output terminals. Figure 3 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.
- Page 17 the location of these switches. 2. When replacing the fuse, confirm that it has 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.
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Page 18: Parts Replacement Procedure
Caution Please 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. Discharge the high voltage capacitors on the inverter circuit. 2. - Page 19 Screws to remove the magnetron 9.2. Inverter power supply (U) 1. 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 the chassis (See figure 3) 5.
- Page 20 sink because it is hot. Figure 3 Removal of the inverter PCB Figure 4 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.
- Page 21 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 and then peeling away from the outside surface. NOTE: 1. The escutcheon key board is attached to the escutcheon base with double faced adhesive tape.
- Page 22 Note Do not use a soldering iron or de soldering tool of more than 30 watts on DPC contacts 9.5. Fan Motor 1. Disconnect the two lead wires from the fan motor terminals 2. Remove the power cord by removing the two wires from the noise filter and the ground connection from the oven chassis.
- 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 Removing the Turntable motor cover Figure 9 Two screws to remove the turntable motor 9.8. Quartz Heater 1. Remove the sensor cable from the DPC connector CN7. 2. Remove the exhaust guide A by removing the two screws shown in figure 10. 3.
- Page 25 Removing the exhaust guide and grill cover Figure 11 Removing the screws holding the grill heater Figure 12 Removing the grill element 9.9. Convection Element And Circulation Fan Motor 1. Remove one screw to remove the the exhaust guide D. Figure 13. 2.
- Page 26 4. Remove the power cord. 5. Remove the wire terminals from the circulation fan motor and the convection heater element. 6. Remove the four screws from the oven base. Figure 15 7. Carefully place hte oven onto its base and remove the backplate. 8.
- Page 27 Removing the oven back plate Figure 15 Removing the base plate Figure 16...
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Page 28: Component Test Procedure
Removing the circulation motor 10. Component Test Procedure 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. - Page 29 secondary latch switch. 3. Test the continuity of the switches with the door open and closed with an ohm meter on the lowest scale. Normal continuity readings should be as followed. Door Open Door Closed Primary Latch infinite (Close) Switch (Open) Secondary infinite...
- Page 30 10.4. Push Button Keyboard Check the continuity between the switch terminals, by tapping an appropriate pad on the keyboard. The 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.
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Page 31: Measurements And Adjustments
See troubleshooting of the inverter circuit and magnetron on page 27 to determine if the inverter power supply is still functioning. 10.7. Temperature Sensor A temperature sensor is mounted on the rear of the oven. The resistance reading across the thermistor should read 300K ohm within a temperature range of 10 to 30 degrees centigrade. - Page 32 mounting tabs are not bent, broken or otherwise deficient in their 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.
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Page 33: Troubleshooting Guide
3. Stir the water again and read the temperature of the beaker (Recorded as T2) 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... - Page 34 Fuses are not blown Fuses are not blown...
- Page 35 Other problems Inverter circuit troubleshooting...
- Page 36 Alternative method for toubleshooting the inverter circuit 13. Digital Programmer Troubleshooting Guide...
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Page 37: Exploded View
How to check semiconductors 14. Exploded View... -
Page 38: Main Parts List
15. Main Parts List 1. Part Numbers are indicated for most mechanical parts. For spare part orders, please use these part numbers and not the part description Important Safety Notice 1. Component identified by “!” have special characteristics important for safety. When replacing any of these components, use only the manufacturers specified parts. - Page 39 Remarks Ref. No. Part No. Part Name & Description E00069000EP WARNING LABEL E41199000GP EXHAUST GUIDE D E10589000BP BACK PANEL COVER E605A4V20BP THERMISTER AEE9108A20GN HOLDER K (P CLIP) E900C4V20GP POWER CORD SUPPLY E67597550GP FUSE 10A E607X4V20BP NOISE FILTER E400A4760JP FAN MOTOR AEE6230P10GN FUSE 16A E09020000AP...
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Page 40: Door Assembly
ADIABATIC MATERIAL E20339000BP HEATER COVER B E41079000GP EXHAUST GUIDE B E09230000AQ CUSHION RUBBER E490S8020GP CONV MOTOR E22399000BP CIRCUALTION FAN E110D4V30ABP OUTER PANEL NN-A813AB E110D4V30SBP OUTER PANEL NN-A873SB E110D4V30HBP OUTER PANEL NN-A883WB E01505870EP WARNING LABEL 16. Door Assembly 16.1. NN-A813AB, NN-A873SB... - Page 41 E302A6A50SEP DOOR A ASSEMBLY A873SB E30214000AP DOOR KEY SPRING E30188000BP DOOR KEY A E302K9000BP DOOR E E30859000BP DOOR C When ordering any door component also order door C, this part may become damaged during dissassembly of the door. 16.2. NN-A883WB...
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Page 42: Escutcheon Base Assembly
Ref. No. Part No. Part Name & Description Remarks E302A6A50HEP DOOR A ASSEMBLY A883WB E30214000AP DOOR KEY SPRING E30188000BP DOOR KEY A E302K9000BP DOOR E E30859000BP DOOR C When ordering any door component also order door C, this part may become damaged during dissassembly of the door. -
Page 43: Packing And Accessories
Ref. No. Part No. Part Name & Description Remarks E890L6A50AEP ESCUTCHEON BASE ASSEMBLY A813AB E890L6A50SEP ESCUTCHEON BASE ASSEMBLY A873SB E890L6A50HEP ESCUTCHEON BASE ASSEMBLY A883WB E80726A50ABP DOOR OPENING BUTTON A813AB E80726A50SBP DOOR OPENING BUTTON A873SB E80726A50HBP DOOR OPENING BUTTON A883WB E80375K00AP SPRING E82566A50BP DOOR OPENING LEVER... - Page 45 Ref. No. Part No. Part Name & Description Remarks E01176A50BP LOWER TRAY FILLER E01695750BP SERVICE CENTRE LIST E000B6A50EP COOK BOOK E00036A50EP OPERATING INSTRUCTIONS E290D5850GP ROLLER RING E0211-1520 FOAM SHEET E06015020GP 32L ENAMEL TRAY E06014N30BP GLASS TRAY E01176A50BP LOWER TRAY FILLER E06016A50BP 32L SQUARE WIRE RACK E06016A50BP 32L SQUARE ENAMEL TRAY E01086A50BP TRAY PACKING...
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Page 46: Digital Programmer Circuit
Trim Model Number Top And Bottom Strip REF No 1 Side strip REF No 2 Set Microwave Oven Model Number NN-TKA80W E1603A510HBP E1601A540HBP NN-A853WB NN-TKA80M E1603A510NBP E1601A540NBP NN-A823MB NN-A873SB NN-TKA80A E1603A510ABP E1601A540ABP NN-A813AB Installation Guide A0003A810BP 20. Digital Programmer Circuit 20.1. - Page 47 20.2. DPC 2...