Panasonic inverter NN-CT870WBPQ Service Manual Download Page 13 | Manualshive

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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 convection process, if the oven tempera-
ture is higher than the predetermined temperature, the
fan motor rotates to cool the electronic components and
the oven.

Convection Cooking Duty Cycles

Figure 1

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11
12
13
14
15
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Summary of Contents for inverter NN-CT870WBPQ

Page 1: ...HAD1003004C2 Microwave Oven NN CT880MBPQ NN CT870WBPQ 32L United Kingdom Panasonic Home Appliance Division 2010 Unauthorized copying and distribution is a violation of law ...

Page 2: ...3 Troubleshooting Guide 33 14 Exploded View 36 15 Parts List 37 16 Door Assy 39 17 Escutcheon Base 40 18 Packing and Accessories 42 19 Trim Kit 43 20 Digital Programmer Circuit 44 21 Key Board Matrix 45 Power source 230V 240V AC Single Phase 50Hz Power requirements Microwave 1200W Grill 1560W Convection 1300W Combi 2700W Output IEC60705 Microwave 1000W Grill 1500W Convection 1250W Microwave freque...

Page 3: ...he inverter PCB as this can be very dangerous Replace the high voltage inverter circuit as a complete unit Return the old unit fully repacked in the original shipping box and completed paper work 4 Do not adjust or tamper with the preset volume on the inverter board It is very dangerous to adjust this preset without proper test equipment 5 Do not test the oven while the inverter grounding strip or...

Page 4: ...ng cooking the door is opened or Stop Cancel Pad is pressed once Start Pad has to be pressed again to continue cooking 16 Stop Cancel Pad Before Cooking one press clears your instructions During Cooking one press temporarily stops the cooking program Another press cancels all your instructions and the time of day will appear in the display 3 Beep Sound A beep sounds when a pad is pressed If this b...

Page 5: ... min 1 min 10 sec 1 h Press five times Press twice Inoperable Example of how to set 1 25pm Timer Timer Select Cooking Time Press this pad until the power you require appears in the display window Microwave Cooking and Defrosting There are 6 different microwave power levels available Selecting Microwave Power Level 10 min 1 min 10 sec 1 h Micro Power Start Power Press Level Wattage once High 1000 W...

Page 6: ...g unless you are using the enamel shelf Start Convection Cooking Press to select oven temperature The oven starts at 150 C and then for each press the temperature will count up in 10 C stages to 250 C then to 40 C 100 C 110 C etc The Convection symbol will appear Press Start to preheat A P will appear in the display window When the oven is preheated the oven will beep and the P will flash Then ope...

Page 7: ...250 C then to 100 C 110 C etc Grill and Convection symbols will appear Press to select Grill power if you wish to adjust from Grill 3 Low to select Grill 1 High or Grill 2 Medium Press Start to preheat P will appear in the display window When the oven is preheated the oven will beep and the P will flash Then open the door and place the food inside 10 min 1 min 10 sec 1 h Start Press Time Pads to e...

Page 8: ... to 100 C 110 C etc Press Micro Power Pad to select Microwave setting HIGH DEFROST are not available Press to enter required cooking time 10 sec pad is inoperable Press Start Pad Combination 2 Grill and Microwave This Combination mode is suitable for foods which are normally grilled and for reheating small savoury items Do not use this program with less than 200 g 7 oz of food It is necessary to p...

Page 9: ...ecessary to preheat and food should always be cooked uncovered 10 min 1 min 10 sec 1 h Turbo Bake Grill 1 2 3 Micro Power Start Combination Press Combination Pad Press to select oven temperature The oven starts at 150 C and then for each press the temperature will count up in 10 C stages to 250 C then to 100 C 110 C etc Press to select Grill Power if you wish to adjust from Grill 3 Low to Grill 1 ...

Page 10: ...NN CT880MBPQ NN CT870WBPQ 10 6 Schematic Diagram ...

Page 11: ...NN CT880MBPQ NN CT870WBPQ 11 7 Wiring Diagram Wiring Harness ...

Page 12: ...ble below Duty cycles for Grill Cooking 8 3 Auto weight defrost Auto weight Cook When an auto control feature is selected and the start pad pressed 1 The digital programmer circuit determines the power level and the cooking time and indicates the operating state in the display The table shows the corresponding cooking times for each category and its respective weight 2 When the cooking time in the...

Page 13: ...upplying 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 convection process if the oven tempera ture is higher than the predetermined temperature the fan motor rotates to cool the electronic ...

Page 14: ...rill combination the sequence applies with the digital programmer circuit switching power relay RY4 to con trol the grill elements With convection grill and micro power combination The grill elements and convection elements are operated alternatively whilst the oven temperature is above the selected level Convection Microwave Combination Convection Heater Microwave ON time OFF time Output W Duty O...

Page 15: ...NN CT880MBPQ NN CT870WBPQ 15 8 5 1 convection and microwave duty cycles Figure 1 ...

Page 16: ...NN CT880MBPQ NN CT870WBPQ 16 8 5 2 grill and microwave duty cycles Figure 2 ...

Page 17: ...o sensor cooking a carefully designed instrument called the humidity sensor element senses the escape of steam then based upon the auto sensor program selected the unit will automatically determine the correct power level and the proper length of time it will take to cook the food NOTE Auto sensor cooking is successful with the foods and recipes found in the auto sensor cooking guide Because of th...

Page 18: ...om danger in ordinary use extreme care should be taken during repair As you can see it looks like a TV flyback transformer however the current is extremely large and is therefore dangerous due to this high current and high voltage The aluminium heat sink is also energized with high voltage HOT so do not touch when the AC input terminal is con nected The power devices Collector is directly connecte...

Page 19: ... to discharge Please be sure to touch the chassis ground side first and then short to the output terminals 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 DO NOT measure the voltage in the high voltag...

Page 20: ...ir 1 After repair or replacement of parts make sure that the screws of the oven etc are neither loose nor missing Microwaves might leak if screws are not properly tight ened 2 Make sure that all electrical connections are tight before inserting the plug into the wall outlet 3 Check for microwave energy leakage Refer to proce dure for measuring microwave energy leakage CAUTION MICROWAVE RADIATION D...

Page 21: ... holding the magnetron as shown in figure 2 NOTE After replacing the magnetron tighten the mount ing screws making sure that there is no gap between the waveguide and the magnetron to prevent microwave leak age Caution 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 ma...

Page 22: ...nd 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 replacing the inverter power supply U 1 Make sure that grounding plate is in place 2 Securely tighten the grounding screw through the side of the chassis Base 3 Securely connect the 3 lead wire connectors 4 Make sure that the heat ...

Page 23: ...n base with double faced adhesive tape Therefore apply ing hot air such as using a hair dryer is recommended for smoother removal 2 When installing a new escutcheon key board make sure that the surface of the escutcheon base is cleared suffi ciently so that problems such as shorted contacts and uneven surfaces can be avoided 10 4 Low voltage transformer and or power relays Note Be sure to ground y...

Page 24: ...t 4 Remove the door key and spring from the door E After replacement of the defective component parts of the door reassemble it and follow the instructions below for proper installation and adjustment so as to prevent exces sive 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 direc...

Page 25: ...Disconnect the cables to the grill heater 4 Remove the grill cover by removing the 5 screws in figure 11 5 Remove the two screws holding the grill heater Figure12 6 Loosen the 2 screws holding the ceramic grill holders turn the holders to release the grill element 7 Remove the heater bracket D by using a flat blade screw driver to lever back the tabs 8 The grill element can now be removed from ins...

Page 26: ...NN CT880MBPQ NN CT870WBPQ 26 Removing the screws holding the grill heater Figure 11 Removing the grill element Figure 12 ...

Page 27: ... 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 16 9 Remove the circulation fan by removing the three screws Figure 16 10 Remove the convection element by ...

Page 28: ...NN CT880MBPQ NN CT870WBPQ 28 Removing the oven back plate Figure 14 Removing the base plate Figure 15 ...

Page 29: ...NN CT880MBPQ NN CT870WBPQ 29 Removing the circulation motor Figure 16 ...

Page 30: ...tch 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 11 3 Magnetron Continuity checks can only indicate an open filament or a shorted magnetron To diagnose an open filament or shorted magnetron 1 Is...

Page 31: ...f the oven The resistance reading across the thermistor should read 300K ohm within a temperature range of 10 to 30 degrees centigrade This would be the temperature range within a kitchen environment If the resistance measured is outside this range the thermistor is defective and should be replaced NOTE When measuring the resistance of the thermistor dis connect the connector from the digital prog...

Page 32: ...re that the latch keys move smoothly after adjustment is completed Completely tighten the screws holding the door hook assembly to the oven assembly 3 Reconnect the short switch primary switch and second ary latch switches and check the continuity of the monitor circuit and latch switches by following the component test procedures on page 12 2 Measurement of microwave output The output power of th...

Page 33: ...NN CT880MBPQ NN CT870WBPQ 33 13 Troubleshooting Guide ...

Page 34: ...NN CT880MBPQ NN CT870WBPQ 34 Fuses are not blown Fuses are blown Checking the semiconductors using a resistance meter ...

Page 35: ...ting 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 ...

Page 36: ...NN CT880MBPQ NN CT870WBPQ 36 14 Exploded View ...

Page 37: ...PIN 1 20 E400E9000BP AIR GUIDE 1 21 E48236750BP CAM A 1 22 E61425180AP SHUTTER SWITCH 1 23 E22439000BP ADIABATIC MATERIAL A 1 24 E40447P00BP INVERTER AIR GUIDE 1 26 E40307M30BP AIR GUIDE D 1 27 E030E4V20BP HV LEAD WIRE 1 28 E606YM300XN INVERTER 1 29 E66017P00BP INVERTER EARTH BRACKET 1 30 E65857H83BP INVERTER SUPPORT BRACKET 1 31 E10214V20UP ADAPTER PLATE 1 32 E610T6700BP OVEN LAMP 1 33 E603Y7X80B...

Page 38: ...71 E41079000GP EXHAUST GUIDE B 1 72 E09230000AQ CUSHION RUBBER 1 73 E490S8020GP CONV MOTOR 1 74 E22399000GP CIRCUALTION FAN 1 76 E01507550BP WARNING LABEL 1 77 E090900BCAN BASEPLATE CUSHION 2 78 E09230000AN CUSHION 1 Ref No Part No Part Name Description Qty 75 E110D6A50NBP OUTER PANEL 1 Ref No Part No Part Name Description Qty 75 E110D4V30HBP OUTER PANEL 1 Ref No Part No Part Name Description Qty ...

Page 39: ...become damaged during disassembly of the door Ref No Part No Part Name Description Qty D1 E302A7X80HBP DOOR A ASSEMBLY 1 D2 E30214000AP DOOR KEY SPRING 1 D3 E30188000BP DOOR KEY A 1 D4 E302K9000BP DOOR E 1 D5 E30859000BP DOOR C 1 D6 E30067300AP HINGE 1 Ref No Part No Part Name Description Qty D1 E302A7X80NBP DOOR A ASSEMBLY 1 D2 E30214000AP DOOR KEY SPRING 1 D3 E30188000BP DOOR KEY A 1 D4 E302K900...

Page 40: ...SULATION SHEET 1 E8 E83097P00BP PCB SPACER 1 E9 E605S7X80BP PCB HU 1 E10 E82566A50BP DOOR OPENING LEVER 1 E11 E80378A0AG DOOR OPENING BUTTON SPRING 1 E12 E80727P00HBP DOOR OPENING BUTTON 1 E13 E63837X80BP MEMBRANE SWITCH 1 E14 E80347X80HBP ESCUTCHEON BASE 1 NOTE When ordering a new Escutcheon base E14 also order a nameplate E1 Write the model number and serial number of the microwave oven onto the...

Page 41: ...Ref No Remarks Part No Part Name Description Qty E1 E00077X80NBP NAME PLATE 1 E2 E81897P20BP DISPLAY WINDOW 1 E3 E80257P00NBP OPERATING BUTTONS 1 E4 E81277P00BP BACK PLATE 1 E5 E66167P00BP RIBBON CABLE 1 E6 E603L7X80BP PCB AU 1 E7 E60707P20BP INSULATION SHEET 1 E8 E83097P00BP PCB SPACER 1 E9 E605S7X80BP PCB HU 1 E10 E82566A50BP DOOR OPENING LEVER 1 E11 E80378A0AG DOOR OPENING BUTTON SPRING 1 E12 E...

Page 42: ...IGH 1 P5 E06016A50BP SQUARE ENAMEL TRAY 1 P6 E06026A50BP SQUARE WIRE RACK 1 P7 E06014N30BP GLASS TRAY 1 P8 E06015020VP ENAMEL TRAY 1 P9 E290D5850GP ROLLER RING 1 P10 E06485020AP SPATTER SHEILD 1 P11 E00037X80BP OPERATING INSTRUCTIONS 1 P12 E01024V20BP CARTON BOX 1 P13 E01056A50BP LOWER FILLER 1 P14 E01069000BP COVER POLYTHENE 1 P15 E01079000BP DOOR SHEET 1 P16 E01926430GP PROTECTOR SHEET 1 P17 E01...

Page 43: ...ription Microwave Oven Model Number NN TKA80W E1603A510HBP 1 Top And Bottom Strip REF No 1 NN CT870WB NN TKA80M E1603A510NBP 1 Top And Bottom Strip REF No 1 NN CT880MB NN TKA80W E1601A540HBP 1 Side strip REF No 2 NN CT870WB NN TKA80M E1601A540NBP 1 Side strip REF No 2 NN CT880MB A0003A810BP Installation Guide ...

Page 44: ...NN CT880MBPQ NN CT870WBPQ 44 20 Digital Programmer Circuit ...

Page 45: ...ED PIZZA B 2 A 1 I 9 AUTO MENU 6 C 13 CASSEROLE 14 MEAT SAUCE J 10 AUTO MENU 7 C 15 POTATO CRISPY TOP 16 PASTA CRISPY TOP K 11 AUTO MENU 8 C 17 WHOLE CHICKEN 18 CHICKEN PIECES WITH BONE 19 CHICKEN PIECES BONELESS L 12 AUTO MENU 9 C 20 BAKE FRUIT CRUMBLE 21 BAKE CAKE M 13 㧙㧙 N 14 1 HOUR C O 15 10 MIN C P 16 10 SEC C Q 17 1 MIN C R 18 㧙㧙 S 19 MICRO POWER C T 20 CONVECTION C U 21 COMBINATION 㧙 V 22...

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