Panasonic NN-8508 Service Manual Download Page 8 | Manualshive

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Summary of Contents for NN-8508

Page 1: ...Cavity Dimensions 14 7 16 W X 14 5 8 D X 9 1 8 H 367 mm W X 372 mm D X 232 mm H Weight 55 Ibs 24 5 kg Specifications subject to change without notice Matsushita Services Company Panasonic Hawaii Inc P...

Page 2: ...sion line and cavity for proper align B Make the following safety checks on all ovens to ment integrity and connections ors be serviced before activating the magnetron or D Any defective or misadjuste...

Page 3: ...TION TIME COOKING a ee BAKING AUTO PREHEATING enn Mus BROILING AUTO PREHEATING S aromur SSSCSC C S S S S dSCSCSC CT PToericex SSSCSC C iRSC MSCS PRODUCT DESTINATION LOCATION OF NAMEPLATE MODEL wee o w...

Page 4: ...Display Window Time Pads Power Pad Stand Timer Pad Bake Cooking Pad AW Combination Pad 1 0 lb Pad Cooking Guide aAuto Reheat Pads Auto Sensor Cook Pad Stop Reset Pad QDA Start Clock Pad Combination C...

Page 5: ...d being reheated All foods must be previously cooked 2 Make sure glass tray in the oven is dry to assure best cooking results 3 Foods should always be covered loosely with plastic wrapper lid 4 Foods...

Page 6: ...nsils iwininisiniaiein yan ninneae nae AHRENE Following is a summary chart which describes the correct use of cooking utensils in your microwave flat heater oven Cookware Heat Resistant Glass Glass Ce...

Page 7: ...Y TRANSFORMER LOW VOLTAGE TRANSFORMER DIGITAL PROGRAMMER CIRCUIT of0 HUMIDITY SENSOR NN 8808 8858 OVEN TEMP SENSOR OVEN THERMISTOR WIRING DIAGRAM NOTE When replacing check the lead wire color as shown...

Page 8: ...operated Ground zr Chassis LOWER UPPER HEATER HEATER POWER POWER RELAY C RELAY D DIGITAL PROGRAMMER CIRCUIT Lame POY OVEN TEMP SENSOR OVEN THERMISTOR Oo SHORT SWITCH HOODOO UOQDOOY Y 20 HIGH VOLTAGE...

Page 9: ...TRANSFORMER Pa se DIGITAL PROGRAMMER CIRCUIT Lemel Pan HUMIDITY SENSOR OVEN TEMP SENSOR OVEN THERMISTOR This oven is equipped with automatic conversion system for both SOHz and 60Hz power supply frequ...

Page 10: ...cycles of alternating ON OFF intervals of defrosting power and standing periods See Fig 5 B During each defrosting period power relay B is energized for 9 seconds and de energized for 13 seconds by D...

Page 11: ...r circuit 4 Auto reheat NIN 8508 8558 When the Auto Reheat Control feature is selected by tapping the appropriate key pads and the start pad is tapped A The digital programmer circuit determines the p...

Page 12: ...nd stops supplying 18V DC signal to the power relays C and D resulting in turn off of upper and lower heaters After the heaters have been turned off the oven temperature will continue to increase a wh...

Page 13: ...control signals again at the timing predetermined NOTE The power relays B C and D do not tum on at the same time Any of two power relays of them should be always off so that in put current always rem...

Page 14: ...calculating the T2 time by using the for mula below make sure this 30 seconds is subtracted from TO time 3 T1 time The total amount of time it takes the microwave oven to switch to T2 time During thi...

Page 15: ...ver touch any circuit wiring with your hand nor with an insulated too during operation 3 When parts must be replaced remove the power plug from the outlet 4 When the 15 Amp fuse is blown due to the op...

Page 16: ...voltage transformer should be connected to F terminal and the lead wire from high voltage capacitor should be connected to FA terminal See Fig 16 2 citor A Disconnect 2 lead wires from fan motor term...

Page 17: ...f the escutcheon bracket is cleaned sufficiently so that any problem shorted contacts or uneven surface can be avoided NOTE 3 Make sure new membrane keyboard is aligned to the left and lower edges of...

Page 18: ...carefully pulling outward starting from upper right hand corner Fig 22 C Remove door key spring and remove 3 screws holding door handle Fig 23 D Separate the door A from the door E by freeing 6 catch...

Page 19: ...screws holding heater panel A and lift off the panel E Remove 4 screws holding inner heater panel and lift out Fig 26 F Remove adiabatic material B G Remove the upper heater heater B by carefully free...

Page 20: ...table motor connector E Remove 2 screws holding 2 heater terminalis Fig 29 F Remove the motor bracket by removing 3 screws Fig 30 G Remove the lower heater panel by removing 5 screws Fig 34 H Remove t...

Page 21: ...hassis should be infinite 3 Diode A Isolate the diode from the circuit by disconnecting the leads SS FILAMENT B With the ohmmeter set on the highest resistance scale measure the MAGNE TRON TERMINALS C...

Page 22: ...the Brown White wires again 6 6 should disappear in display window and following digits see chart should appear indicating balance of cooking time T2 TIME The time should start to count down and oven...

Page 23: ...mbly 2 Measurement of microwave output The power output of the magnetron can be determined by performing a simple water heating test as described below Necessary Equipment Two1 liter beakers Glass the...

Page 24: ...ch is graduated to 600cc and place the beaker in the center of the oven B Set the radiation monitor to 2450MHz and use it following the manu facturer s recommended test procedure to assure correct res...

Page 25: ...shaded area of the digital programmer circuit Terminals of power relaies and primary circuit of low voltage transformer When troubleshooting be cautious of possible electrical shock hazard hop First o...

Page 26: ...ons NOTE 2 Check continuity of power relay B s contacts between 1 and 2 and if it has continuity replace power relay B too Shorted contacts of latch switch A and power relay B RY B Shorted latch switc...

Page 27: ...oven does not operate normally when auto sensor cook ing is selected Open or loose wiring of sensor terminals from D P C Defective humidity sensor Defective D P C See trouble 5 G H on page 29 On Defe...

Page 28: ...x AC 20V voltage of IC1 Pin No Abnormal 5 S6 Approx AC 3V Normal Approx 5V NN 8508 8558 PIN NO OF L V T VOLTAGE Peel Dna 1 S2 Approx AC 20V 3 S4 Approx AC 3V B Abnormal Display 1 Dark or unclear displ...

Page 29: ...minals and check the operation Oven stops it s operation 30 seconds after the start pad is tapped Humidity sensor heater stays on Red Glows for 30 seconds Oven operates TO BE CONTINUED FOR HUMIDITY SE...

Page 30: ...SING AN OHM METER Diode ie ool FORWARD REVERSE AK SMALL le A K ANODE CATHODE _t A K _tr _ Transistor COLLECTOR NPN Transistor B BASE ece EMITTER PNP Transistor E c ECB E Fo ente B ie Ec 8s Digital Tra...

Page 31: ...load in the oven 2 Tap Power pad once for High power 1st stage 3 Set for 5 seconds by tapping Number pad 4 Tap Power pad 3 times for Medium power 2nd stage 5 Set for 10 seconds by tapping Number pad O...

Page 32: ...by tapping 1 0 tb pad 4 times AUTO COMB CD 3 Tap Start pad 150 15 c 4 521 2 ozs ROOM TEMPERATURE WATER Tap Auto Sensor CooK Pad once 1 Tap Auto Reheat Tap Start Pad 1 Pastry pad 4 times 2 Tap Start p...

Page 33: ...es P begins to blink After completion of preheating be sure to open the door Close the door and set bake cooking time for 2 minutes Tap Start pad DISPLAY 8 Combination Cooking Time cooking OPERATION D...

Page 34: ...NN 8508 NN 8558 NN 8808 NN 8858 NN 8808P EXPLODED VIEW AND PARTS LIST e o x a 4 a rs an See page 35 See page 35 EXPLODED VIEW...

Page 35: ...G MATERIAL METAL TURNTABLE Cut intothree parts when packing FRONT VIEW a DIODE Tochassis HIGH VOLTAGE CAPACITOR HIGH VOLTAGE TRANSFORMER HIGH VOLTAGE CAPACITOR qj Humidity sensor element O P Circuit i...

Page 36: ...Fan motor Fan Hook spacer C Cover A Air guide A Air guide A Motor bracket Exhaust guide A Exhaust guide A Heater B Thermat cutout H V Transformer H V Transformer H V Capacitor H V Capacitor Diode Swit...

Page 37: ...NN 8508 NN 8808 APH NN 8808P NN 8858 NN 8508 NN 8558 W Component NN 808 NN 8858 W Component NN 8808P W Component APH NN 8808P CPH NN 8508 NN 8808 NN 8808P NN 8558 NN 8858 NN 8508 NN 8808 NN 8808P NN 8...

Page 38: ...ormer For NN 8508 NN 8558 NN 8808 NN 8858 H V Transformer For NN 8808P Stopper A Fan motor bracket B Base B Escutcheon base Base C Base For NN 8508 NN 8558 NN 8808 NN 8858 Base For NN 8808P Reinforce...

Page 39: ...S R12 R3 19 20 21 24 41 42 43 R4 5 23 28 29 30 NN 8808 P 8858 NN 8808P SERVICE FIXTURES AND TOOLS EXTENSION CABLES Description Cable No 16 Cable No 37 Cable No 33 Cable No 9 AT40M004 4 pin Extension C...

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