Inverter NN-CT880MBPQ Service Manual
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Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 27 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. 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 the oven onto its base and remove the backplate. 8. Remove the nut holding the circulation fan. Figure
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 4 4 Control Panel Chaos Defrost Vegetables Potatoes Fish Pizza Meat Crispy Top Chicken Bake 10 min 1 min 10 sec 1 h Micro Power Grill 1-2-3 Convection Combination Turbo-Bake Memory Timer Start Stop / Cancel less more NN-CT890S (1) Display Window (2) Time Pads (3) Auto Weight Chaos Defrost Programs (4) Auto Sensor Programs (5) Auto Weight Combination Bake Programs (6) Microwave Power Pad (7) Grill Pad (8) Convection Pad (9) Turbo-Bake Pad (10) Combination Pad (11) Memory Pad (12) Timer Pad: This can be used
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 19 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. When replacing or checking parts, remove the power plug from the outlet and short the inverter output terminal of the magnetron filament terminals to the chassis ground with an insulated handle screwdriver to discharge. Please be sure to touch the chassis
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 35 6A 5 BPQ Other problems Inverter circuit troubleshooting 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 meter used for troubleshooting. Alternative method for toubleshooting, the inverter circuit
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 2 1 Contents 1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Inverter Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 Feature Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 4 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 5 Operat
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 14 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. When the oven temperature reaches the predetermined tem- perature, the digital programmer circuit stops supplying power to relay (RY5) resulting in the convection heater
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 32 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. Then follow the installation procedures below. • Interlock switch replacement - In replacing faulty switches, be sure 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 pr
NN-CT880MBPQ NN-CT870WBPQ 17 Figure 3 8.5.3 Grill,Convection and microwave duty cycles 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 coo
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 6 10 min 1 min 10 sec 1 h Grill 1-2-3 Start Grilling Start • Select Grill power. Press once for Grill 1 (High), twice for Grill 2 (Medium) or three times for Grill 3 (Low). The Grill symbol will appear. • Press Start to preheat. “P” will appear in the display window. When the grill is preheated the oven will beep and the “P” will flash. Then open the door and place the food inside. • Press Time pads to enter cooking time. Maximum time is 99 mins., 50 secs. 1 h pad is inoperable. • Press Start. The cooking program will sta
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 22 10.2. 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. Remove the one screw holding the inverter earth wire to the oven chassis. 6. Carefully remove the inverter PCB and support base from the oven. 7. Remove the air guide E by un-clipping the catch hooks 8. Remove the four screws holding the PCB to the inverter support base. Caution when re
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 7 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. ALWAYS PREHEAT BEFORE USE . The Metal Tray must be on the Glass Turntable when preheating, unless you are using the enamel shelf on the lower level. If using enamel shelf, remove glass turntable and roller ring. Grill 1-2-3 Start Turbo-Bake • Press t
NN-CT880MBPQ NN-CT870WBPQ 25 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. 10.8. 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 1
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 5 5 Operation G Press Timer Pad twice Colon starts to blink. “SET TIME” will appear in the display window. G Press Time Pads Enter time of day by pressing Time Pads e.g. 13 pm (24hr clock). G Press Timer Pad Colon stops blinking. Time of day is now locked into the display. Press thirteen times Setting the Clock N.B. 1. To reset time of day, repeat steps above. 2. The clock will keep the time of day as long as the oven is plugged in and electricity is supplied. 3. This is a 2
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 13 8.4. Convection Cooking 1. The digital programmer circuit operates the power relays RY3,RY5 and RY6 in the sequence as shown in the figure below. 2. When the oven reaches a predetermined temperature the digital programmer circuit stops supplying power to relay RY5, resulting in the convection heater turning off. 3. When the temperature drops below the predetermined temperature, the digital programmer circuit supplies power to power relay RY5 resulting in the convection heater turning on. Note: After the convect
Inverter NN-CT880MBPQ, NN-CT880MBPQ NN-CT870WBPQ 12 8 Description of Operating instruction 8.1. 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. 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 microwave power since approximately 2 seconds are required for heating the magnetron filament. NOTE: 2 If microwave cooking is over 8 minutes on HIGH power, the fan motor rotates for 1 minute after cooking to cool the oven and electrical
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