Panasonic NN-ST658W, NN-SD698S, NN-ST678S manual Troubleshooting Other problems

Page 20

NN-SD698S / NN-ST678S / NN-ST658W

8.2.(Troubleshooting) Other problems

 

SYMPTOM

 

CAUSE

CORRECTIONS

1.

Oven is dead.

1.

Open or loose lead wire harness

 

 

Fuse is OK.

2.

Open thermal cutout / thermistor

Check thermal cutout is defective.

 

No display and no operation at all.

3.

Open low voltage transformer

 

 

 

4.

Defective DPC

 

2.

No display and no operation at all.

1.

Shorted lead wire harness

Check adjustment of primary, secondary latch

 

Fuse is blown.

2.

Defective primary latch switch (NOTE 1)

switch and monitor interlock switch including

 

 

3.

Defective monitor interlock switch (NOTE 1)

door.

 

 

 

 

 

4.

Defective Inverter Power Supply (U)

 

 

 

 

NOTE 1:

 

 

 

 

All of these switches must be replaced at the same time.

 

 

 

Check continuity of power relay RY1 contacts (between 1 and 2) and if it has continuity, replace

 

 

 

power relay RY1 also.

 

3.

Oven does not accept key input

1.

Key input is not in proper sequence

Refer to operation procedure.

 

(Program)

2. Open or loose connection of membrane key

 

 

 

 

pad to DPC (Flat cable)

 

 

 

3.

Shorted or open membrane key board

 

 

 

4.

Defective DPC

Refer to DPC troubleshooting.

4.

Fan motor turns on when oven is

1.

Misadjustment or loose wiring of secondary

Adjust door and latch switches.

 

plugged in with door closed.

 

latch switch

 

 

 

2.

Defective secondary latch switch

 

 

 

3.

Door switch CN3

 

5.

Timer starts count down but no

1.

Off-alignment of primary latch switch

Adjust door and latch switches.

 

microwave oscillation.

2.

Open or loose connection of high voltage

 

 

(No heat while oven lamp and fan

 

circuit especially magnetron filament circuit

 

 

motor turn on)

 

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

Check high voltage component according to

 

 

 

H.V. Inverter Power Supply (U)

component test procedure and replace if it is

 

 

 

Magnetron

defective.

 

 

4.

Open or loose wiring of power relay RY1

 

 

 

5.

Defective primary latch switch

 

 

 

6.

Defective DPC or power relay RY1

Refer to DPC troubleshooting

6.

Oven can program but timer does not

1.

Open or loose wiring of secondary latch switch

 

 

start countdown.

2.

Off-alignment of secondary latch switch

 

 

 

3.

Defective secondary latch switch

 

7.

Microwave output is low. Oven takes

1.

Decrease in power source voltage

Consult electrician

 

longer time to cook food.

2.

Open or loose wiring of magnetron filament

 

 

 

 

circuit.(Intermittent oscillation)

 

 

 

3.

Aging change of magnetron

 

8.

Fan motor turns on and turntable

1.

Low voltage transformer on DPC.

 

 

motor rotates when door is opened.

 

 

 

9.

Oven does not operate and return to

1.

Defective DPC

Check grounding connector on escutcheon

 

plugged in mode as soon as [Start]

 

 

base.

 

pad is pressed.

 

 

 

10.

Loud buzzing noise can be heard.

1.

Loose fan and fan motor

 

11.

Turntable motor does not rotate.

1.

Open or loose wiring of turntable motor

 

 

 

2.

Defective turntable motor

 

12.

Oven stops operation during cooking.

1.

Open or loose wiring of primary and

Adjust door and latch switches.

 

 

 

secondary latch switch

 

 

 

2.

Operation of thermal cutout

 

20

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Contents NN-SD698S NN-ST678S NN-ST658W NN-SD698S / NN-ST678S / NN-ST658W NN-SD698S / NN-ST678S / NN-ST658W Contents Schematic Diagram Variable power cooking control Inverter power supply circuitDescription of Operating Sequence Inverter defrostSensor reheat ThermistorExplanation of the Auto Sensor Cooking process Balance of cooking time T2 timeCheck the grounding Inverter warningsInverter warning Grounding of the inverter circuit boardPart replacement Verification after repairSharp edges Discharging the high voltage capacitorsDisassembly and Parts Replacement Procedure MagnetronDigital programmer circuit D.P.C To replace membrane key boardLow voltage transformer and/or power relays RY1, RY2 Door assemblyTo re-install components Fan motorTurntable motor Steam sensorInverter power supply Component Test Procedure Monitor Interlock SwitchTest Inverter power supply UTemperature thermistor Measurements and Adjustments Measurement of microwave outputProcedure for Measuring Microwave Energy Leakage EquipmentNN-SD698S / NN-ST678S / NN-ST658W Troubleshooting Guide Troubleshooting Oven stops operation during cookingTroubleshooting Other problems Troubleshooting of inverter circuit U and magnetron Alternate way to troubleshoot oven with AC Ampere meter usedSimple WAY of H.V. INVERTER/MAGNETRON Troubleshooting H.V.INVERTER Board Main Parts List F606Y8M00APProcedure PurposeHow to check the semiconductors using an OHM meter Exploded View and Parts List Exploded ViewParts List Inverter Bracket Wiring Materials Door Assembly Escutcheon Base Assembly NN-SD698SNN-ST678S NN-ST658W Packing and Accessories Digital Programmer Circuit NN-SD698SNN-SD698S / NN-ST678S / NN-ST658W NN-ST678S NN-SD698S / NN-ST678S / NN-ST658W NN-ST658W NN-SD698S / NN-ST678S / NN-ST658W NN-SD698S 01/08
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NN-ST658W, NN-ST678S, NN-SD698S specifications

The Panasonic NN-SD688S and NN-SD698S are two high-performance microwave ovens designed to meet the needs of modern households. With cutting-edge technology and innovative features, these models offer a convenient way to heat, cook, and defrost a variety of foods.

At the heart of both models is the Inverter Technology, which provides consistent and precise cooking power throughout the microwave's cooking time. Unlike traditional microwaves that use a turn-on, turn-off method to regulate cooking power, the inverter system delivers a steady stream of energy. This allows for evenly cooked meals, reduces the chances of overcooking, and ensures delicate items like fish and vegetables retain their texture and flavor.

Both the NN-SD688S and NN-SD698S boast a spacious 1.2 cubic feet capacity, allowing users to easily accommodate large dishes and multiple servings. The sleek and modern stainless steel design ensures these microwaves fit seamlessly into any kitchen décor, while also being easy to clean and maintain.

The microwaves come equipped with an array of smart cooking features, including the Sensor Cook function. This technology automatically detects the steam released from food and adjusts cooking time and power levels accordingly. This feature takes the guesswork out of microwave cooking, ensuring perfectly cooked meals without constant monitoring.

Another standout feature is the Keep Warm function, which helps maintain food temperature without cooking it further. This can be especially useful when preparing multiple dishes or when meals need to be served at different times.

Both models also include a variety of pre-programmed cooking options, providing quick access to commonly prepared items. With one-touch settings for popcorn, pizza, and more, users can select their desired food type and let the microwave handle the rest.

In terms of safety, Panasonic has integrated a child safety lock to prevent accidental operation, which offers peace of mind for families with young children.

In summary, the Panasonic NN-SD688S and NN-SD698S microwaves reflect the brand's commitment to innovative cooking solutions. With features such as Inverter Technology, Sensor Cook, and a sleek design, these models are perfect for those seeking efficiency, convenience, and ease of use in their kitchen appliances. Whether reheating leftovers, cooking fresh meals, or defrosting ingredients, these microwaves offer versatility and reliability, making them essential tools for any modern kitchen.