Panasonic NN-CF770M CPH Service Manual Download Page 1 | Manualshive

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© Panasonic Home Appliances Microwave Oven
(Shanghai) Co., Ltd. 2010.

NN-CF770M

CPH (CANADA)
RPH (MEXICO & LATIN AMERICA)

Microwave Oven

ORDER NO.PHAMOS1007054C7

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Summary of Contents for NN-CF770M CPH

Page 1: ... Panasonic Home Appliances Microwave Oven Shanghai Co Ltd 2010 NN CF770M CPH CANADA RPH MEXICO LATIN AMERICA Microwave Oven ORDER NO PHAMOS1007054C7 ...

Page 2: ...2 NN CF770M ...

Page 3: ...3 NN CF770M ...

Page 4: ...Power Relay RY1 20 7 2 Monitor Interlock Switch 20 7 3 Magnetron 20 7 4 Inverter power supply U 21 7 5 Temperature thermistor 21 8 MEASUREMENTS AND ADJUSTMENTS 22 8 1 Adjustment of primary latch switch secondary latch switch and monitor interlock switch 22 8 2 Measurement of microwave output 22 9 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 23 9 1 Equipment 23 9 2 Procedure for measuring radia...

Page 5: ...1 FEATURE CHART 2 CONTROL PANEL 5 NN CF770M ...

Page 6: ...3 SCHEMATIC DIAGRAM 3 1 CPH 6 NN CF770M ...

Page 7: ...3 2 RPH 7 NN CF770M ...

Page 8: ...rent transformer built into the inverter circuit 6 This signal is fed back to the microcomputer in the DPC to determine operating conditions and output necessary to control PWM signal to the Inverter Power Supply for control of the output power 4 3 Auto Menu cooking When the Auto Menu feature is selected and the Start button is tapped 1 The digital programer circuit determines the power level and ...

Page 9: ...enses the oven cavity temperature through oven temp sensor thermistor When the oven temperature reaches the set temperature DPC stops supplying high level signal to the power relay and the heater turn off 4 After the convection heater turn off the oven temperature will continue increasing for a while and then decrease When the oven temperature drops below the set temperature the digital programmer...

Page 10: ...The aluminum heat sink may be HOT due to heat energy therefore extreme care should be taken during servicing H V Inverter warning WARNING FOR INVERTER POWER SUPPLY U GROUNDING Check the High Voltage Inverter Power Supply circuit grounding The high voltage inverter power supply circuit board must have a proper chassis ground The inverter grounding plate must be connected to the chassis If the inver...

Page 11: ...ugh any holes in the unit during operation Never insert a wire nail or any other metal object through the lamp holes on the cavity or any holes or gaps because such objects may work as an antenna and cause microwave leakage 5 6 Verification after repair 1 After repair or replacement of parts make sure that the screws of the oven etc are neither loosen or missing Microwave energy might leak if scre...

Page 12: ... hot 1 Discharge high voltage remaining in high voltage capacitor 2 Disconnect 2 high voltage lead wires from magnetron filament terminals 3 Disconnect connector CN701 CN702 from H V Inverter board 4 Remove 4 screws holding inverter reinforcement bracket A on right heater panel base plate respectively 5 Release locking tabs connecting inverter air guide with inverter bracket 6 Remove 1 screw holdi...

Page 13: ...ng sure there is no gap between the waveguide and the magnetron to prevent microwave leakage CAUTION When replacing the magnetron be sure the antenna gasket is in place 6 3 Digital programmer circuit D P C Membrane Sheet NOTE Be sure to ground any static electric charge built up on your body before handling the D P C 1 Remove 1 screw holding reinforcement bracket and escutcheon base on front plate...

Page 14: ...oard 7 Use tools such as kinfe etc to lift the edge of membrane sheet and peel off escutcheon sheet key board membrane completely from escutcheon base NOTE a The membrane key board is attached to the escutcheon base with double faced adhesive tape Therefore applying hot air such as using a hair dryer is recommended for smoother removal b When installing the new key board membrane make sure that th...

Page 15: ...or power relays NOTE Do not use a soldering iron or desoldering tool of more than 30 watts on D P C contacts B With all the terminal pins cleaned and separated from D P C contacts remove the defective transformer power relays Replace components making sure all terminal pins are inserted completely resolder all terminal contacts carefully 6 5 Fan motor 1 Disconnect 2 lead wires from fan motor termi...

Page 16: ... by pushing the door E upward and out 5 Remove door key and door key spring To re install components 1 Place the door s lower hinge pin into the bottom hinge hole 2 Use your left index finger to support the door s lower hinge pin while guiding the door s upper hinge pin into the top hinge hole 3 Lower your finger to seat the door onto the hinges 4 Replace other components NOTE Adjust so that the u...

Page 17: ... the new stirrer motor and reconnecting the 2 lead wires reinstall the motor cover by rotating it around 180 tucking the 2 tabs under the base in the 2 provided slots then screw the single tab to the base using a 4mm 6mm screw 6 9 Convection fan motor and convection heater 1 Remove 1 screw holding side cover on cavity back plate 2 Remove 1 screw holding side cover on the side of back cover then re...

Page 18: ...ively 6 Remove 10 screws holding convection outside cover B on cavity back plate then remove the module which consists of convection inside cover A convection motor and convection heater To replace convection heater 7 Remove 1 nut holding convection fan then remove convection fan 8 Remove 2 screws holding convection fan bracket on convection inside cover A 18 NN CF770M ...

Page 19: ...ater bracket A on convection inside cover A 10 Remove 2 screws holding convection heater on convection inside cover A To replace convection motor 11 Remove 2 screws holding convection motor on convection fan bracket 19 NN CF770M ...

Page 20: ...r Opened Primary Latch Switch 0Ω Close Ω Open Secondary Latch Switch 0Ω Close Ω Open Power Relay RY1 Ω Open Ω Open 7 2 Monitor Interlock Switch 1 Unplug lead wires from Inverter Power Supply U primary terminals 2 Connect test probes of ohm meter to the disconnected leads that were connected to Inverter Power Supply U 3 Test the continuity of Monitor Interlock Switch with door opened and closed pos...

Page 21: ...3 Plug in the oven s AC power supply cord into outlet 4 Program DPC a Press Timer Clock button twice b Press Start button once c Press Micro Power button once 5 Program oven at High power for 1 minute and press Start button a After approximately 3 seconds oven stops operating b During oven operation the input current is approximately 0 4A INPUT CURRENT FAILURE CODE Unplug CN701 0 4A Oven stops in ...

Page 22: ...ircuit and all latch switches again by following the component test procedures 8 2 Measurement of microwave output The output power of the magnetron can be determined by performing IEC standard test procedures However due to the complexity of IEC test procedures it is recommended to test the magnetron using the simple method outlined below Necessary Equipment 1 liter beaker Glass thermometer Wrist...

Page 23: ...ge always use the 2 inch 5cm spacer supplied with the probe 4 Tap the Start button or set the timer and with the magnetron oscillating measure the leakage by holding the probe perpendicular to the surface being measured 9 2 1 Measurement with the outer panel removed Whenever you replace the magnetron measure for radiation leakage before the outer panel is installed and after all necessary componen...

Page 24: ...9 4 At least once a year have the radiation monitor checked for calibration by its manufacturer 24 NN CF770M ...

Page 25: ...your body 7 120V AC is present on the digital programmer circuit Terminals of power relay s and primary circuit of Digital Programmer Circuit When troubleshooting be cautious of possible electrical shock hazard Before troubleshooting operate the microwave oven following the correct operating procedures in the instruction manual in order to find the exact cause of any trouble since operator error m...

Page 26: ...tart button H V Inverter U operates by the control signals from DPC but magnetron is not oscillating 1 Magnetron 2 Loose lead wire connector CN703 3 H V Inverter U Oven stops in 1 minute after pressing Start button Convection function Oven thermistor circuit is not functioning 1 Oven thermistor 2 Loose wiring 2 No display and no operation at all Fuse is blown Most probably loose connection of conn...

Page 27: ...ch switches 2 Open or loose connection of high voltage circuit especially magnetron filament circuit NOTE Large contact resistance will cause lower magnetron filament voltage and cause magnetron to have lower output and or be intermittent 3 Defective high voltage component H V Inverter Power Supply U Magnetron Check high voltage component according to component test procedure and replace if it is ...

Page 28: ...and H99 First you must program the DPC into TEST MODE press Timer Clock button twice Press Start button once press Power Level button once Program unit for operation H95 H97 H98 H99 appears in display window a short time after Start button is pressed and there is no microwave oscillation Alternate way to troubleshoot oven with AC Ampere meter used H95 H97 H98 H99 appears in display window a short ...

Page 29: ...owave oscillation at any power 1 IC1 pin 27 voltages while operation at high power Abnormal IC1 Normal 5V Step2 2 Collector of Q222 voltage Abnormal Q222 and or Q225 Q226 Q227 Normal 0 7V Step3 3 Short circuit between collector of Q222 and emitter of Q225 Still not turn on RY1 RY1 turns on Q222 and or Q225 Q226 Q227 Dark or unclear display 1 Replace display and check operation Normal Display Abnor...

Page 30: ...gnetron circuit Open magnetron wiring between Inverter and magnetron terminal 2 Between 1 0A and 2 0A Check continuity of D702 in Inverter PCB 1 D702 shorted Replace H V Inverter F606Y8X00AP 2 D702 is OK Replace magnetron Shut off in 3 seconds after Start 1 Less than 0 5A Check open circuit Latch Switch DPC Power Relay and CN701 Replace defective component s or correct switch cables and connectors...

Page 31: ...10 7 How to check the semiconductors using an OHM meter 31 NN CF770M ...

Page 32: ...11 EXPLODED VIEW AND PARTS LIST 11 1 EXPLODED VIEW 32 NN CF770M ...

Page 33: ...DESCENT LAMP U 1 22 J61415G10XN MICRO SWITCH 1 PRIMARY LATCH SWITCH 23 F61415U30XN MICRO SWITCH 1 SECONDARY LATCH SWITCH 25 F61785U30XN MICRO SWITCH 1 MONITOR INTERLOCK SWITCH 26 2M261 M32JLP MAGNETRON 1 29 F62308F00AP FUSE 1 20A 31 F607X9M80CP NOISE FILTER U 1 CPH 31 F607X9M80RP NOISE FILTER U 1 RPH 32 F81247Q70BP BREAKWATER 1 34 F61449Q30AP STIRRER MOTOR 1 35 F900C9M80CP AC CORD W PLUG 1 37 F003...

Page 34: ...1 79 F41809M60BP CONVECTION FAN BRACKET 1 80 F490S9M80CP CONVECTION FAN MOTOR 1 81 F631D9M80CP CONVECTION HEATER 1 82 F64174V00BP HEATER BRACKET A 1 83 F66797Q70BP CONVECTION INSIDE COVER 1 84 A22429M60BP ADIABATIC MATERIAL 1 85 F66807Q70BP CONVECTION OUTSIDE COVER 1 86 A67359M50QP HEATER PROTECTOR 1 87 F40667Q70BP EXHAUST GUIDE D 1 88 F2099 1P00 REINFORCEMENT BRACKET D 1 89 F00066G00RP CAUTION LA...

Page 35: ... MEMBRANE SHEET 1 RPH E5 F80349M60SBP ESCUTCHEON BASE 1 E6 F891P9L60KXP DOOR OPENING BUTTON U 1 E7 F80375K00AP COOK BUTTON SPRING 1 E8 F82569M60BP DOOR OPENING LEVER 1 E9 F80579M60BBP ESCUTCHEON BASE B 1 E10 F66168J00XP FLAT CABLE 1 E11 F803G9M60SBP POP OUT DIAL U 1 E13 F82989M60SBP BUTTON 1 E15 F00079M80SCP NAME PLATE 1 CPH E15 F00079M80SRP NAME PLATE 1 RPH E16 F81269M60BP LCD DISPLAY WINDOW 1 E1...

Page 36: ...me Description Pcs Set Remarks D1 F30186P40AG DOOR KEY A 1 D2 F302A9M50SQP DOOR A U 1 D3 F301P9M60BP DOOR E U 1 D4 F30215G10XN DOOR KEY SPRING 1 D5 F30859Q30AP DOOR C 1 D8 F04114180CP HC LABEL 1 CPH D8 F02459660AP DHHS LABEL 1 RPH 36 NN CF770M ...

Page 37: ...11 5 WIRING MATERIALS Ref No Part No Part Name Description Pcs Set Remarks W1 F030A9M80CP LEAD WIRE HARNESS 1 INCLUDING OVEN TEMP SENSOR MAGNETRON THERMISTOR W2 F030E 1P00 H V LEAD WIRE 1 37 NN CF770M ...

Page 38: ...ASE PAPER 1 CPH P2 F01029M80SRP PACKING CASE PAPER 1 RPH P3 F01049M60BP UPPER FILLER 1 P4 F01059M60BP LOWER FILLER 1 P5 F01066Y40XP P E BAG 1 P6 F01078100XN DOOR SHEET 1 P7 F060V9M60QP WIRE RACK 1 LOW P8 F06037J70XP ENAMEL SHELF 1 P9 F01089M50QP TRAY PACKING 1 P11 E07496Y40BP GLASS TRAY 1 P12 F01926Y40XP SHEET 1 P16 F04459M80CP OVERLAY 1 CPH P17 F060V9M50QP WIRE RACK 1 HIGH 38 NN CF770M ...

Page 39: ...12 DIGITAL PROGRAMMER CIRCUIT 12 1 SCHEMATIC DIAGRAM 39 NN CF770M ...

Page 40: ...40 NN CF770M ...

Page 41: ...26 D27 D4EAY112A036 ZENER RESISTOR 2 1100V IC1 MNE31G9M8CP L S I 1 IC10 C0DAGYY00041 IC 1 IC200 B1HBGFF00007 IC 1 IC221 B3PAC0000060 IC SSR 1 Q180 B1BAAJ000003 TRANSISTOR 1 R311 D0AE102JA155 CARBON FILM RESISTOR 1 1KΩ 1 4W 5 R10 D0AE103JA155 CARBON FILM RESISTOR 1 10KΩ 1 4W 5 R290 D0AE104JA155 CARBON FILM RESISTOR 1 100KΩ 1 4W 5 R220 D0AE331JA155 CARBON FILM RESISTOR 1 330Ω 1 4W 5 RY1 AEBGJQC25F18...

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