Related Manuals for Panasonic NN-CT890SBPQ
Summary of Contents for Panasonic NN-CT890SBPQ
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Page 1: Microwave Oven
HAD1003001C2 Microwave Oven NN-CT890SBPQ United Kingdom © Panasonic Home Appliance Division 2010. Unauthorized copying and distribution is a violation of law. -
Page 2: Table Of Contents
NN-CT890SBPQ 1 Contents Contents ............2 Inverter Warnings . -
Page 3: Inverter Warnings
NN-CT890SBPQ 2 Inverter Warning The inverter board looks like a regular PCB, however, this PCB drives the magnetron tube using very high voltages and cur- rent. It has 1. Very high voltage and high current 2. An Aluminium heat sink that becomes very hot 3. -
Page 4: Control Panel
NN-CT890SBPQ 4 Control Panel Display Window Time Pads Auto Weight Chaos Defrost Programs Auto Sensor Programs Auto Weight Combination Bake Chaos Programs Defrost Microwave Power Pad Grill Pad Vegetables Convection Pad Turbo-Bake Pad (10) Combination Pad Potatoes (11) Memory Pad... -
Page 5: Operation
NN-CT890SBPQ 5 Operation Setting the Clock Example of how to set 1.25pm Timer Press thirteen Press twice Timer times Inoperable Press five times Press Timer Pad twice Press Time Pads Press Timer Pad Colon starts to blink. “SET TIME” Enter time of day by pressing Colon stops blinking. -
Page 6: Convection Cooking
NN-CT890SBPQ Grilling Always preheat the grill before use. The metal tray must be on the glass turntable when preheating, unless you are using the enamel shelf. Grill 1-2-3 Start Start • Select Grill power. • Press Start to • Press Time pads to •... -
Page 7: Combination Cooking
NN-CT890SBPQ TURBO-BAKE Cooking The oven can be programmed to cook or reheat food by the grill and the convection oven working simultaneously, to give foods that extra crispness and colour. This is known as TURBO-BAKE and can often reduce traditional oven cooking times. - Page 8 Combination 1. Convection and Microwave This is the most popular combination mode combining convection heat with microwave power. Casseroles, meat joints, jacket potatoes and pastries are very successful using this combination. Unsuitable foods are those which contain whisked eggs, meringues, rich fruit cakes, biscuits and yorkshire puddings.
- Page 9 Start inoperable • Press to enter required cooking time. • Press Start Pad. 10 sec. pad is inoperable. Combination 3. TURBO-BAKE and Microwave This Combination mode is very useful for foods which require quick browning or crisping. Unsuitable foods are casseroles, cakes, meringues, pastries with sweet fillings, foods containing whisked eggs and yorkshire puddings.
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Page 10: Schematic Diagram
NN-CT890SBPQ 6 Schematic Diagram... -
Page 11: Wiring Diagram
NN-CT890SBPQ 7 Wiring Diagram Wiring Harness... -
Page 12: Description Of The Operation Sequence
NN-CT890SBPQ 8 Description of Operating instruction 8.1. Variable power cooking control 8.3. Auto weight defrost, Auto weight Cook The HIGH VOLTAGE INVERTER POWER SUPPLY controls the output power by a signal from the digital Programmer circuit When an auto control feature is selected and the start pad DPC. - Page 13 NN-CT890SBPQ 8.4. Convection Cooking 1. The digital programmer circuit operates the power relays temperature, the digital programmer circuit supplies RY3,RY5 and RY6 in the sequence as shown in the figure power to power relay RY5 resulting in the convection below.
- Page 14 NN-CT890SBPQ 8.5. 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 operates the power relays as shown in the figures below.
- Page 15 NN-CT890SBPQ 8.5.1 convection and microwave duty cycles Figure 1...
- Page 16 NN-CT890SBPQ 8.5.2 grill and microwave duty cycles Figure 2...
- Page 17 NN-CT890SBPQ 8.5.3 Grill,Convection and microwave duty cycles Figure 3 8.6. 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. All that is necessary is to select an auto sensor program before starting to cook.
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Page 18: Cautions To Be Observed When Troubleshooting
NN-CT890SBPQ 9 Cautions to Be Observed When Troubleshooting Unlike many other appliances, the microwave oven is a high voltage, high current device. Although 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 19 NN-CT890SBPQ Inverter Grounding Figure 2 Discharging the high voltage capacitors Figure 3 WARNING! DISCHARGE THE HIGH VOLTAGE CAPACITORS For about 30 seconds after the oven is turned off, an elec- tric charge remains in the high voltage capacitors in the inverter power supply circuit board.
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Page 20: Confirm After Repair
NN-CT890SBPQ 9.3. When parts must be replaced, 9.6. Confirm after repair remove the power plug from 1. After repair or replacement of parts, make sure that the screws of the oven, etc. are neither loose nor missing. the outlet. Microwaves might leak if screws are not properly tight- ened. -
Page 21: Part Replacement Procedure
NN-CT890SBPQ 10 Parts Replacement Procedure 10.1. Magnetron 1. Discharge the high voltage capacitors on the inverter cir- cuit. 2. Remove the five screws shown in figure 1 3. Disconnect the two high voltage leads from the magne- tron 4. Remove the four screws holding the magnetron as shown... - Page 22 NN-CT890SBPQ 3. Securely connect the 3 lead wire connectors 4. Make sure that the heat sink has enough space (gap) from the oven. Take care not to touch any lead wire to the aluminium heat sink because it is hot.
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Page 23: Digital Programmer Circuit
NN-CT890SBPQ Disconnecting the PCB lock connector Removal of DPC AU and DPC HU Figure 4 Figure 5 10.3. Digital Programmer Circuit (DPC) membrane board. NOTE: Ground any static electric built up on your body before handling the DPC. 1. Disconnect all connectors from the DPC. -
Page 24: Door Disassembly
NN-CT890SBPQ 10.5. Fan Motor proper installation and adjustment so as to prevent exces- sive microwave leakage. 1. Disconnect the two lead wires from the fan motor termi- 1. When mounting the door to the oven, be sure to adjust nals the door parallel to the bottom line of the oven face plate 2. -
Page 25: Quartz Heater
NN-CT890SBPQ 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. Two screws to remove the turntable motor... - Page 26 NN-CT890SBPQ Removing the screws holding the grill heater Figure 11 Removing the grill element Figure 12...
- Page 27 NN-CT890SBPQ 10.9. Convection Element And Circulation Fan Motor 1. Remove one screw to remove the exhaust guide D. Figure 13. 2. Remove the rear heater cover by removing the three screws. Figure 13 3. Remove the temperature sensor by removing the two screws. Figure 14 4.
- Page 28 NN-CT890SBPQ Removing the oven back plate Figure 14 Removing the base plate Figure 15...
- Page 29 NN-CT890SBPQ Removing the circulation motor Figure 16...
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Page 30: Component Test Procedure
NN-CT890SBPQ 11 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. 3. Before touching any oven components, or wiring, always unplug the oven from its power source and discharge the high voltage capacitors. -
Page 31: Humidity Sensor
NN-CT890SBPQ 11.5. Inverter Power Supply Caution DO NOT try to repair this inverter power supply. Replace as a whole H.V. Inverter Unit. Inverter power supply diagram Figure 3 11.6. Inverter Power Supply Unit Warning Do not attempt to make any measurements in the high volt- age circuitry of the inverter or magnetron. -
Page 32: Measurements And Adjustments
NN-CT890SBPQ 12 Measurements and Adjustments Warning • For continued protection against radiation hazard, replace only with identical parts. • When the 10 amp fuse is blown due to the operation of the short switch, you must replace the primary latch switch and short switch. -
Page 33: Troubleshooting Guide
NN-CT890SBPQ 13 Troubleshooting Guide... - Page 34 NN-CT890SBPQ Fuses are blown Fuses are not blown Checking the semiconductors using a resistance meter...
- Page 35 NN-CT890SBPQ Other problems Inverter circuit troubleshooting 6A5BPQ Alternative method for toubleshooting, the inverter circuit Alternate way to troubleshoot oven with AC Ampere meter used H95, H97, H98, H99 appears in display window a short time after start key is pressed and no microwave oscillation with AC Ampere...
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Page 36: Exploded View
NN-CT890SBPQ 14 Exploded View... -
Page 37: Parts List
NN-CT890SBPQ 15 Parts List 1. Part numbers are indicated on most mechanical parts. Please use these part numbers for part orders. Do not use the descrip- tion of the part. Important safety notice 1. Components identified by the “!” mark have special characteristics important for safety. When replacing any of these compo- nents, use only the manufacturers specified part numbers. - Page 38 NN-CT890SBPQ Ref. No. Part No. Part Name & Description E22429000BP ADIABATIC MATERIAL E20337M30BP HEATER COVER B E41079000GP EXHAUST GUIDE B E09230000AQ CUSHION RUBBER E490S8020GP CONV MOTOR E22399000GP CIRCUALTION FAN E110D4V30SBP OUTER PANEL E01507550BP WARNING LABEL E090900BCAN BASEPLATE CUSHION E09230000AN CUSHION...
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Page 39: Door Assy
NN-CT890SBPQ 16 Door Assembly Ref. No. Part No. Part Name & Description E302A7X80SBP DOOR A ASSEMBLY E30214000AP DOOR KEY SPRING E30188000BP DOOR KEY A E302K7X80BP DOOR E E30859000BP DOOR C E30067300AP HINGE When ordering any door component also order door C, this part may become damaged during disassembly of the door. -
Page 40: Escutcheon Base
NN-CT890SBPQ 17 Escutcheon Base Assembley Ref. No. Mark Part No. Part Name & Description E80874L00SGS Earth Spring E81897P20BP Display Window E80257P00SBP Operating Buttons E81277P00BP Back Plate E66167X80BP Ribbon Cable E603L7X80BP Pcb Au E60707P20BP Insulation Sheet E83097P01BP Pcb Spacer E605S7X80BP Pcb Hu... -
Page 41: Packing And Accessories
NN-CT890SBPQ 18 Packing & Accessories Ref. No. Part Number Part Name & Description E06435870GS RUBBER FOOT (RED) E060V8020BP WIRE RACK LOW E06435870SP RUBBER FOOT (BLACK) E060V5870SP WIRE RACK HIGH E06016A50BP SQUARE ENAMEL TRAY E06026A50BP SQUARE WIRE RACK E06014N30BP GLASS TRAY... - Page 42 NN-CT890SBPQ Ref. No. Part Number Part Name & Description E01069000BP COVER POLYTHENE E01079000BP DOOR SHEET E01926430GP PROTECTOR SHEET E01049000BP UPPER FILLER...
- Page 43 NN-CT890SBPQ 19 Parts List For Microwave Oven Trim Kits Trim Model Number Part Name Description NN-TKA80W E1603A510HBP Top And Bottom Strip REF No 1 NN-TKA80M E1603A510NBP Top And Bottom Strip REF No 1 NN-TKA80W E1601A540HBP Side strip REF No 2...
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Page 44: Trim Kit
NN-CT890SBPQ 20 Digital Programmer Circuit... -
Page 45: Key Board Matrix
NN-CT890SBPQ 21 Key Board Matrix Key Arrangemen t Port Arrangement Micro Pin No. A( 1) STAR T B (2) STOP/CANCEL 32(P24) C (3) D(4) AUTO MENU 1 33(P10) 1? BREAD 2? MINCE/CHOPS 34(P33) X (24 ) 3? MEAT ? JOINTS...