Inverter NN-CT880MBPQ Service Manual
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Inverter NN-CT880MBPQ Service Manual

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NN-CT880MBPQ
NN-CT870WBPQ
32L
United Kingdom
©
Panasonic Home Appliance Division 2010. Unauthorized copying
and distribution is a violation of law.
HAD1003004C2

Microwave Oven

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Summary of Contents for Inverter NN-CT880MBPQ

  • Page 1: Microwave Oven

    HAD1003004C2 Microwave Oven NN-CT880MBPQ NN-CT870WBPQ United Kingdom © Panasonic Home Appliance Division 2010. Unauthorized copying and distribution is a violation of law.

  • Page 2: Table Of Contents

    Inverter Warnings ........

  • Page 3: Inverter Warnings

    It also contains high voltages. Inverter PCB layout 3. Do not attempt to repair the inverter PCB as this can be very dangerous. Replace the high voltage inverter circuit as a complete unit. Return the old unit fully repacked...

  • Page 4: Control Panel

    NN-CT880MBPQ NN-CT870WBPQ 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-CT880MBPQ NN-CT870WBPQ 5 Operation Setting the Clock Example of how to set 1.25pm Timer Timer Press thirteen Press twice times Inoperable Press five times Press Timer Pad twice Press Time Pads Press Timer Pad Colon starts to blink. “SET TIME”...
  • Page 6 NN-CT880MBPQ NN-CT870WBPQ 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 NN-CT880MBPQ NN-CT870WBPQ 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 NN-CT880MBPQ NN-CT870WBPQ 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 NN-CT880MBPQ NN-CT870WBPQ 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.

  • Page 10: Description Of Operating Instruction

    DPC. The power relay (RY1) turns on to supply power to the pressed: inverter circuit. The level of output power is controlled by the 1. The digital programmer circuit determines the power level drive signal level from the inverter circuit.
  • Page 11 NN-CT880MBPQ NN-CT870WBPQ 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 12 During this time the digital programmer circuit continues to operate relay (RY1) so that microwave activity continues at the duty cycle selected. The inverter control signal level is also maintained. The microwave activity continues to cycle until the entire cooking program is completed.
  • Page 13 NN-CT880MBPQ NN-CT870WBPQ 8.5.1 convection and microwave duty cycles Figure 1...
  • Page 14 NN-CT880MBPQ NN-CT870WBPQ 8.5.2 grill and microwave duty cycles Figure 2...
  • Page 15 NN-CT880MBPQ NN-CT870WBPQ 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.

  • Page 16: Cautions To Be Observed When Troubleshooting

    This high voltage inverter power supply circuit board must have a proper chassis ground, the inverter grounding bracket must be connected to the chassis. If the inverter board is not grounded it will expose very high voltages and cause extreme DANGER! Be sure that the inverter circuit is...
  • Page 17 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 ground side first and then short to the output terminals.

  • Page 18: Confirm After Repair

    1. This is mandatory. Refer to “adjustments and measure- • Magnetron ments” for the location of these switches. • High voltage transformer (Located on inverter (U)) 2. When replacing the fuse, confirm that it has the appropri- • High voltage diodes (Located on inverter (U)) ate rating for these models.

  • Page 19: Part Replacement Procedure

    When replacing the magnetron, ensure that the antenna gasket is in place. Note The magnetron used for this model is unique for the inverter power supply system. Make sure to use the magnetron as listed in the parts list. Removal of the magnetron...
  • Page 20 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.
  • Page 21 NN-CT880MBPQ NN-CT870WBPQ 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 22: Door Disassembly

    NN-CT880MBPQ NN-CT870WBPQ 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...

  • Page 23: Quartz Heater

    NN-CT880MBPQ NN-CT870WBPQ 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.
  • Page 24 NN-CT880MBPQ NN-CT870WBPQ Removing the screws holding the grill heater Figure 11 Removing the grill element Figure 12...
  • Page 25 NN-CT880MBPQ NN-CT870WBPQ 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 26 NN-CT880MBPQ NN-CT870WBPQ Removing the oven back plate Figure 14 Removing the base plate Figure 15...
  • Page 27 NN-CT880MBPQ NN-CT870WBPQ Removing the circulation motor Figure 16...

  • Page 28: Component Test Procedure

    Power relay B 11.2. Short Switch and Monitor Cir- cuit 1. Unplug the lead wires from the HV inverter primary termi- nals. 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.
  • Page 29 NN-CT880MBPQ NN-CT870WBPQ 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 30: Measurements And Adjustments

    NN-CT880MBPQ NN-CT870WBPQ 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 31: Troubleshooting Guide

    NN-CT880MBPQ NN-CT870WBPQ 13 Troubleshooting Guide...
  • Page 32 NN-CT880MBPQ NN-CT870WBPQ Fuses are blown Fuses are not blown Checking the semiconductors using a resistance meter...
  • Page 33 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...

  • Page 34: Key Board Matrix

    NN-CT880MBPQ NN-CT870WBPQ 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...

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