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Inverter NN-CT870WBPQ, Service Manual, Page: 33 / 34

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Inverter NN-CT870WBPQ Service Manual Download Page 33

NN-CT880MBPQ NN-CT870WBPQ

35

6A5BPQ

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

Summary of Contents for 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: ...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 4...

Page 3: ...e 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...

Page 4: ...g 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 Cookin...

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 Micro...

Page 6: ...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...

Page 7: ...50 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...

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 an...

Page 9: ...cessary 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 ov...

Page 10: ...le 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...

Page 11: ...pplying 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...

Page 12: ...ill 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 a...

Page 13: ...NN CT880MBPQ NN CT870WBPQ 15 8 5 1 convection and microwave duty cycles Figure 1...

Page 14: ...NN CT880MBPQ NN CT870WBPQ 16 8 5 2 grill and microwave duty cycles Figure 2...

Page 15: ...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...

Page 16: ...m 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...

Page 17: ...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 pr...

Page 18: ...r 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 electr...

Page 19: ...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...

Page 20: ...d 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 sup...

Page 21: ...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...

Page 22: ...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...

Page 23: ...isconnect 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 cera...

Page 24: ...NN CT880MBPQ NN CT870WBPQ 26 Removing the screws holding the grill heater Figure 11 Removing the grill element Figure 12...

Page 25: ...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...

Page 26: ...NN CT880MBPQ NN CT870WBPQ 28 Removing the oven back plate Figure 14 Removing the base plate Figure 15...

Page 27: ...NN CT880MBPQ NN CT870WBPQ 29 Removing the circulation motor Figure 16...

Page 28: ...t 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 t...

Page 29: ...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 I...

Page 30: ...e 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 seco...

Page 31: ...NN CT880MBPQ NN CT870WBPQ 33 13 Troubleshooting Guide...

Page 32: ...NN CT880MBPQ NN CT870WBPQ 34 Fuses are not blown Fuses are blown Checking the semiconductors using a resistance meter...

Page 33: ...ing 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 use...

Page 34: ...CHILLED 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 CHICK...

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