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© Panasonic Home Appliances Microwave Oven
(Shanghai) Co., Ltd. 2011

NN-CF771S

BPQ (U.K.)
EPG (Continental Europe)

Microwave Oven

ORDER NO.PHAMOS1101010CE

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Summary of Contents for NN-CF771S

Page 1: ... Panasonic Home Appliances Microwave Oven Shanghai Co Ltd 2011 NN CF771S BPQ U K EPG Continental Europe Microwave Oven ORDER NO PHAMOS1101010CE ...

Page 2: ...2 NN CF771S ...

Page 3: ...3 NN CF771S ...

Page 4: ... assembly 15 6 8 Stirrer motor 16 6 9 Convection fan motor and convection heater 16 7 COMPONENT TEST PROCEDURE 19 7 1 Primary Secondary Latch Switch interlocks Power Relay RY1 19 7 2 Short Switch 19 7 3 Magnetron 19 7 4 Inverter power supply U 20 7 5 Temperature thermistor 20 8 MEASUREMENTS AND ADJUSTMENTS 21 8 1 Adjustment of primary latch switch secondary latch switch and short switch 21 8 2 Mea...

Page 5: ...1 FEATURE CHART 2 CONTROL PANEL 5 NN CF771S ...

Page 6: ...3 SCHEMATIC DIAGRAM 6 NN CF771S ...

Page 7: ...up to 2 000V AC 4 Then the half wave doubler voltage rectifier circuit consisting of the H V diodes and capacitors generates the necessary 4 000V DC needed for the magnetron 5 Output power of the magnetron tube is always monitored by the signal output from the current transformer built into the inverter circuit 6 This signal is fed back to the microcomputer in the DPC to determine operating condit...

Page 8: ...nses 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 9: ... 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 inve...

Page 10: ...he 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 screws are not properl...

Page 11: ... 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 12: ...ern making 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 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 2 Disc...

Page 13: ... Relay board 4 Remove flat cable from CN13 on D P C board DU by pulling it out slightly 5 Remove all screws holding D P C board AU Display Dial board 6 Separate D P C board from tabs on the escutcheon base and remove D P C board 13 NN CF771S ...

Page 14: ...ower 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 terminals...

Page 15: ... 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 16: ... 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 17: ...ctively 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 17 NN CF771S ...

Page 18: ...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 18 NN CF771S ...

Page 19: ...r Closed Door Opened Primary Latch Switch 0Ω Close Ω Open Secondary Latch Switch 0Ω Close Ω Open Power Relay RY1 Ω Open Ω Open 7 2 Short 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 short switch with door opened and closed positions using...

Page 20: ... the oven s AC power supply cord into outlet 4 Program DPC a Press Clock button once b Press Timer button once c Press Start button once d 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...

Page 21: ... 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 watch or stopwatch ...

Page 22: ...o discharge any static charge in your body 7 230V 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 a...

Page 23: ...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 24: ...tches 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 defect...

Page 25: ...irst you must program the DPC into TEST MODE press Clock button once press Timer button once Press Start button once press Micro Power 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 ...

Page 26: ... this procedure Power will Ammeter reading is To do Remedy Shut off in 23 seconds after Start 1 Between 0 5A and 1 0A Check and repair open magnetron 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 Z606Y6Y40BP 2 D702 is OK Replace magnetron Shut off in 3 seconds after Start 1 ...

Page 27: ...PACITOR 1 C702 Z0C2E505A262 FILM CAPACITOR 1 C703 Z0C2E395A246 FILM CAPACITOR 1 DB701 Z0FBBQ000007 RECTIFIER BRIDGE 1 L701 Z5020M300GP CHOKE COIL 1 R702 Z0CM352JA002 SAND BAR RESISTOR 1 T701 Z609A6Y40BPP TRANSFORMER 1 INCLUDING D701 D702 C706 C707 D701 D702 Z0FBAZ000004 DIODE 2 C706 Z0C3F562A002 FILM CAPACITOR 1 C707 Z0C3F432A002 FILM CAPACITOR 1 27 NN CF771S ...

Page 28: ...10 EXPLODED VIEW AND PARTS LIST 10 1 EXPLODED VIEW 28 NN CF771S ...

Page 29: ...61415G10XN MICRO SWITCH 1 PRIMARY LATCH SWITCH 23 Z61415U30XN MICRO SWITCH 1 SECONDARY LATCH SWITCH 25 Z61785U30XN MICRO SWITCH 1 SHORT SWITCH 26 Z2M261 M32JL MAGNETRON 1 29 Z62304210BP FUSE 1 10A 250V 30 Z6331 1T50 FUSE 1 15A 250V 31 Z607X9M60BP NOISE FILTER U 1 32 Z81247Q70BP BREAKWATER 1 34 Z61449M60BP STIRRER MOTOR 1 35 Z900C9M60BP AC CORD W PLUG 1 BPQ 35 Z900C9M60EP AC CORD W PLUG 1 EPG 40 Z6...

Page 30: ...MOTOR 1 81 Z631D7Q70BP CONVECTION HEATER 1 BPQ 81 Z631D7Q80EP CONVECTION HEATER 1 EPG 82 Z64174V00BP HEATER BRACKET A 1 83 Z66797Q70BP CONVECTION INSIDE COVER 1 84 Z22429M60BP ADIABATIC MATERIAL 1 85 Z66807Q70BP CONVECTION OUTSIDE COVER 1 86 Z67359M60BP HEATER PROTECTOR 1 87 Z40667Q70BP EXHAUST GUIDE D 1 88 Z20999L70XP REINFORCEMENT BRACKET D 1 30 NN CF771S ...

Page 31: ...80349N00SBP ESCUTCHEON BASE 1 E6 Z891P9N00SBP DOOR OPENING BUTTON U 1 E7 Z80375K00AP COOK BUTTON SPRING 1 E8 Z82569M60BP DOOR OPENING LEVER 1 E9 Z80579M60SBP ESCUTCHEON BASE B 1 E10 Z66168J00XP FLAT CABLE 1 E11 Z803G9N00SBP POP OUT DIAL U 1 E13 Z82989N00SBP BUTTON 1 E15 Z00079N00SBP NAME PLATE 1 CF771S BPQ E15 Z00079N00SEP NAME PLATE 1 CF771S EPG E16 Z81269M60BP LCD DISPLAY WINDOW 1 E17 Z80189M60B...

Page 32: ...art Name Description Pcs Set Remarks D1 Z30186P40AG DOOR KEY A 1 D2 Z302A9N00SBP DOOR A U 1 CF771S BPQ D2 Z302A9N00SEP DOOR A U 1 CF771S EPG D3 Z301P9M60BP DOOR E U 1 D4 Z30215G10XN DOOR KEY SPRING 1 D5 Z30859Q30AP DOOR C 1 32 NN CF771S ...

Page 33: ...10 5 WIRING MATERIALS Ref No Part No Part Name Description Pcs Set Remarks W1 Z030A9M60BP LEAD WIRE HARNESS 1 W2 Z030E 1P00 H V LEAD WIRE 1 W3 Z03877R00SP LEAD WIRE HARNESS U 1 33 NN CF771S ...

Page 34: ...NG CASE PAPER 1 P3 Z01049M60BP UPPER FILLER 1 P4 Z01059M60BP LOWER FILLER 1 P5 Z01066Y40XP P E BAG 1 P6 Z01078100XN DOOR SHEET 1 P7 Z060V9M60BP WIRE SHELF U 1 P8 Z06037J70XP ENAMEL SHELF 1 P10 Z01137Q70BP FOAM 1 P11 Z07496Y40BP GLASS TRAY 1 P12 Z01926Y40XP SHEET 1 P13 Z0177 1L40 FOAM 1 P14 Z06436Y40BP PLASTIC SPACER 4 P15 Z07096Y40BP ANTI SPARK RING 1 P16 Z000B9M60EP COOK BOOK 1 EPG 34 NN CF771S ...

Page 35: ...11 DIGITAL PROGRAMMER CIRCUIT 11 1 SCHEMATIC DIAGRAM 35 NN CF771S ...

Page 36: ...36 NN CF771S 01 11 S 9N0 Printed in China ...

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