Panasonic NN-ST678S Troubleshooting Guide, Troubleshooting Oven stops operation during cooking

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NN-SD698S / NN-ST678S / NN-ST658W

8 TROUBLESHOOTING GUIDE

DANGER: HIGH VOLTAGES

1.DO NOT RE-ADJUST PRESET CONTROL on the H.V.Inverter (U). It is very dangerous to repair or adjust without proper test equipment because this circuit generates very large current and high voltage. Operating a misaligned inverter circuit is dangerous.

2.Ensure proper grounding before troubleshooting.

3.Be careful of the high voltage circuitry, taking necessary precautions when troubleshooting.

4.Discharge high voltage remaining in the H.V.Inverter (U).

5.When checking the continuity of the switches or the H.V.Inverter, disconnect one lead wire from these parts and then check continuity with the AC plug removed. Doing otherwise may result in a false reading or damage to your meter. When disconnecting a plastic connector from a terminal, you must hold the plastic connector instead of the lead wire and then disconnect it, otherwise lead wire may be damaged or the connector cannot be removed.

6.Do not touch any parts of the circuitry on the digital programmer circuit, since static electric discharge may damage this control panel. Always touch ground while working on this panel to discharge any static charge in 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 may be mistaken for the oven’s malfunction.

8.1.(Troubleshooting) Oven stops operation during cooking

 

SYMPTOM

CAUSE

 

CORRECTIONS

1.

Oven stops in 3 seconds after

No 120V AC is supplied to H.V.Inverter (U) CN702

1.

Latch Switch

 

pressing [Start] pad

terminals

2.

Power relay RY1

 

 

 

3.

Loose lead wire connector CN701, CN702

 

 

 

4.

H.V. Inverter (U)

 

Oven stops in 37 seconds after

H.V.Inverter (U) operates by the control signals

1.

Magnetron

 

pressing [Start] pad

from DPC but magnetron is not oscillating

2.

Loose lead wire connector CN703

 

 

 

3.

H.V. Inverter (U)

 

Oven stops in 10 seconds after

Steam sensor circuit is not functioning

1.

Steam sensor

 

pressing [Start] pad

 

2.

DPC

 

(Auto sensor cooking)

 

3.

Open or loose wiring of sensor terminal

 

 

 

from connector CN2 on DPC

2.

No display and no operation at all.

Most probably loose connection of connectors, or

1.

Allign door, Door Latch Switches

 

Fuse is blown.

door latch mechanism is not adjusted properly

2.

Loose wiring connectors

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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 Inverter defrost Variable power cooking controlInverter power supply circuit Description of Operating SequenceBalance of cooking time T2 time Sensor reheatThermistor Explanation of the Auto Sensor Cooking processGrounding of the inverter circuit board Check the groundingInverter warnings Inverter warningDischarging the high voltage capacitors Part replacementVerification after repair Sharp edgesTo replace membrane key board Disassembly and Parts Replacement ProcedureMagnetron Digital programmer circuit D.P.CFan motor Low voltage transformer and/or power relays RY1, RY2Door assembly To re-install componentsSteam sensor Turntable motorInverter power supply Monitor Interlock Switch Component Test ProcedureTemperature thermistor Inverter power supply UTest Measurement of microwave output Measurements and AdjustmentsEquipment Procedure for Measuring Microwave Energy LeakageNN-SD698S / NN-ST678S / NN-ST658W Troubleshooting Oven stops operation during cooking Troubleshooting GuideTroubleshooting Other problems Alternate way to troubleshoot oven with AC Ampere meter used Troubleshooting of inverter circuit U and magnetronPurpose Simple WAY of H.V. INVERTER/MAGNETRON TroubleshootingH.V.INVERTER Board Main Parts List F606Y8M00AP ProcedureHow to check the semiconductors using an OHM meter Exploded View Exploded View and Parts ListParts List Inverter Bracket Wiring Materials Door Assembly NN-SD698S Escutcheon Base AssemblyNN-ST678S NN-ST658W Packing and Accessories NN-SD698S Digital Programmer CircuitNN-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.