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8.7. How to check the semiconductors using an OHM meter

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NN-GD693S

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Содержание NN-GD693S

Страница 1: ... Panasonic Appliances Microwave Oven Shanghai Co Ltd 2013 NN GD693S RPH MEXICO LATIN AMERICA Microwave Oven ORDER NO PAPMOSH1301014CE ...

Страница 2: ...2 NN GD693S ...

Страница 3: ...3 NN GD693S ...

Страница 4: ...agnetron 16 5 4 Inverter power supply U 17 5 5 Temperature thermistor 17 6 MEASUREMENTS AND ADJUSTMENTS 18 6 1 Adjustment of primary interlock switch secondary interlock switch and monitor switch 18 6 2 Measurement of microwave output 18 7 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 19 7 1 Equipment 19 7 2 Procedure for measuring radiation leakage 19 7 3 Record keeping and notification after ...

Страница 5: ...1 SCHEMATIC DIAGRAM 5 NN GD693S ...

Страница 6: ...ed 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 2 3 Inverter defrost When the Auto Control feature is selected and the Start pad is tapped 1 The digital programer circuit determines the power level and cooking time to complete cooking and indicates the operating state i...

Страница 7: ...eed to select power level and cooking time NOTE The Auto Sensor Reheat process is similar as Auto Sensor Cooking process Balance of cooking time T2 time The balance of cooking time which is called T2 time can be calculated by the following formula T2 time in sec T1 time X K factor NOTE Remember the T1 time starts after the 10 second period The coefficient K is programmed into the microprocessor me...

Страница 8: ...nk 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 in...

Страница 9: ...n 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 3 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 properly tightened 2 Make sure...

Страница 10: ...up in your body before handling the DPC 1 Disconnect connector CN701 on H V Inverter board 2 Remove 1 screw holding escutcheon base and slide the escutcheon base upward slightly 3 Remove all screws holding D P C board on escutcheon base 4 Separate D P C board from tabs on the escutcheon base and remove D P C board To replace membrane key board 5 Use tools such as kinfe etc to lift the edge of escu...

Страница 11: ...l terminal pins are inserted completely resolder all terminal contacts carefully 4 4 Fan motor 1 Disconnect 2 lead wires from fan motor terminals 2 Remove 2 screws at location on oven attaching orifice assembly 3 Remove orifice assembly from oven assembly 4 Remove fan blade from the fan motor shaft by pulling it straight out 5 Remove 2 screws holding fan motor to orifice 4 5 Door assembly 1 Suppor...

Страница 12: ...avity slot Then lower your finger to seat the door onto the hinge NOTE Door alignment is crucial If door is misaligned apply pressure until alignment is achieved NOTE Adjust so that the upper portion of the door will touch firmly to the oven cavity front plate without pushing the door If the door assembly is not mounted properly microwave power may leak from the clearance between the door and oven...

Страница 13: ...turntable motor 3 Remove the turntable motor by removing screw NOTE After reinstalling the new turntable 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 4 7 Quartz heater 1 Disconnect lead wires from both side of heater terminals 2 Remove...

Страница 14: ...nsor 1 Disconnect connector CN2 from digital programmer circuit board 2 Disengage catch hooks on sensor cover C from orifice 3 Remove steam sensor from orifice NOTE When installing the steam sensor make sure that the direction of steam sensor is as shown in figure 14 NN GD693S ...

Страница 15: ...ot 1 Discharge high voltage charge 2 Remove the H V lead wire from magnetron terminals 3 Disconnect 2 connectors from CN701 CN702 on H V Inverter U 4 Remove 1 screw holding grounding plate to the base 5 Press 1 encircled locking tab and then slide 4 locking tabs of Inverter bracket at the bottom of the base in direction of arrows 6 Remove 1 screw holding H V Inverter to Inverter bracket 7 Remove 1...

Страница 16: ...sed Door Opened Primary Interlock Switch 0Ω Close Ω Open Secondary Interlock Switch 0Ω Close Ω Open Power Relay RY1 Ω Open Ω Open 5 2 Monitor 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 Switch with door opened and closed position...

Страница 17: ...n 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 Power Level 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 3 second...

Страница 18: ... all interlock switches again by following the component test procedures 6 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...

Страница 19: ...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 7 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 components are replaced or adjusted Special care should be tak...

Страница 20: ...7 4 At least once a year have the radiation monitor checked for calibration by its manufacturer 20 NN GD693S ...

Страница 21: ... correct operating procedures in the instruction manual in order to find the exact cause of any trouble since operator error may be mistaken for the oven s malfunction H97 H98 error code display If 3 times H97 or 2 times H98 exist microwave oven can not be used any more even if the defective parts already be replaced un plug and plug in again How to reset for the service Please take the following ...

Страница 22: ...erates 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 10 seconds after pressing Start button Auto sensor cooking Steam sensor circuit is not functioning 1 Steam sensor 2 DPC 3 Open or loose wiring of sensor terminal from connector CN2 on DPC 2 No display and no operation at all Fuse is blown Most probabl...

Страница 23: ...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 defective 4 Open or loose wiring of power relay RY1 5 Defective primary interlock switch 6 De...

Страница 24: ...nd 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 t...

Страница 25: ...oscillation at any power 1 IC1 pin 27 voltages while operation at high power Abnormal IC1 Normal 5V Step2 2 Collector of Q220 voltage Abnormal Q220 and or Q221 Q222 Q225 Normal 0 7V Step3 3 Short circuit between collector of Q220 and emitter of Q225 Still not turn on RY1 RY1 turns on Q220 and or Q221 Q222 Q225 Dark or unclear display 1 Replace display and check operation Normal Display Abnormal IC...

Страница 26: ...pen 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 F606Y9X90AP 2 D702 is OK Replace magnetron Shut off in 3 seconds after Start 1 Less than 0 5A Check open circuit Interlock Switch DPC Power Relay and CN701 Replace defective component s or correct switch cables and connectors 8 6 H V INVE...

Страница 27: ...8 7 How to check the semiconductors using an OHM meter 27 NN GD693S ...

Страница 28: ...9 EXPLODED VIEW AND PARTS LIST 9 1 EXPLODED VIEW 28 NN GD693S ...

Страница 29: ...COVER A 1 24 F64509X70EP SENSOR COVER B 1 25 F65439X70EP SENSOR COVER C 1 26 J61415G10XN MICRO SWITCH 1 PRIMARY INTERLOCK SWITCH 27 F61415U30XN MICRO SWITCH 1 SECONDARY INTERLOCK SWITCH 28 F6145 1F90 THERMAL CUTOUT 1 29 F612E9Y00AP INCANDESCENT LAMP U 1 30 F61785U30XN MICRO SWITCH 1 MONITOR INTERLOCK SWITCH 31 F606Y9X90AP H V INVERTER U 1 32 2M261 M39R MAGNETRON 1 33 F62308F00AP FUSE 1 34 F62315G1...

Страница 30: ...Ref No Part No Part Name Description Pcs Set Remarks 65 F03349X90RP MENU LABEL 1 30 NN GD693S ...

Страница 31: ...0SRP ESCUTCHEON BASE U 1 E4 F891P9Y40NAP DOOR OPENING BUTTON U 1 E6 F82569Y00AP DOOR OPENING LEVER 1 E7 F80375K00AP COOK BUTTON SPRING 1 E8 F803G9M60SBP POP OUT DIAL U 1 E9 F80189Y40AP DIAL SUPPORT 1 E10 F82989Y40SAP BUTTON 1 E11 F82989Y90SAP BUTTON B 1 E13 F66167D00AP FLAT CABLE 1 E14 F81279Y40AP BACK PANEL 1 E16 F33169Y40AP GROUNDING METAL 1 31 NN GD693S ...

Страница 32: ...SSEMBLY Ref No Part No Part Name Description Pcs Set Remarks D1 F30189Y00AP DOOR KEY A 1 D2 F302A9X90SRP DOOR A U 1 D3 F301P9X70EP DOOR E U 1 D4 F30215G10XN DOOR KEY SPRING 1 D5 F30859Y00AP DOOR C 1 32 NN GD693S ...

Страница 33: ...9 5 WIRING MATERIALS Ref No Part No Part Name Description Pcs Set Remarks W1 F030A9X90RP LEAD WIRE HARNESS 1 INCLUDING MAGNETRON THERMISTOR W2 F030E9Y00AP H V LEAD WIRE 1 33 NN GD693S ...

Страница 34: ...90SRP PACKING CASE PAPER 1 P3 F01049Y00AP UPPER FILLER 1 P4 F01059Y00AP LOWER FILLER 1 P5 F01068100XN P E BAG 1 P6 F01078J00XN DOOR SHEET 1 P7 F01089X90QP RACK PACKING 1 P8 E06014N30BP COOKING TRAY 1 P9 F01099Y00AP SHEET 1 P10 F060V9X70EP OVEN RACK 1 P15 F00166H70RP OPERATION PRECAUTION 1 P18 F04459X90SRP OVERLAY 1 34 NN GD693S ...

Страница 35: ...10 DIGITAL PROGRAMMER CIRCUIT 10 1 SCHEMATIC DIAGRAM 35 NN GD693S ...

Страница 36: ...36 NN GD693S ...

Страница 37: ...1 F67525E40XN DIFFUSION SHEET 1 D25 D4EAY2710001 VARISTOR 1 270V D26 D27 D4EAY112A036 VARISTOR 2 1100V IC1 MN69F009DY1 L S I 1 RY1 RY3 RY4 K6B1AYY00129 POWER RELAY 3 RY2 K6B1AZA00013 POWER RELAY 1 T10 G4C2AAD00006 LOW VOLTAGE TRANSFORMER 1 RE81 EVEJ1HF2224M REVOLVING ENCODER 1 SW1 SW7 SW10 SW13 SW15 SW17 EVQ11L05R TOUCH SWITCH 14 37 NN GD693S 01 13 S 9X9 Printed in China ...

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