Panasonic NN-SD698S, NN-ST678S, NN-ST658W Inverter power supply U, Temperature thermistor, Test

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5.5.Inverter power supply (U)

DO NOT try to REPAIR H.V. Inverter power supply (U). Replace complete H.V. Inverter(U) Unit.

WARNING: HIGH VOLTAGE

Test if failure codes H95, H97 or H98 appear when performing the following procedure. It is recommended to use an AC line input current ammeter for testing.

Test 1

1.With the oven unit’s AC power supply cord is unplugged from the wall outlet, unplug the 2 pin H.V. connector CN703 from the magnetron tube.

2.Place 1 liter of water load into oven cavity.

3.Plug in the oven’s AC power supply cord into outlet.

4.Program DPC.

a.Press Timer/Clock pad twice.

b.Press Start pad once.

c.Press Power Level pad once.

5.Program oven at High power for 1 minute and press [Start] pad.

a.After approximately 37 seconds, oven stops operating.

b.During oven operation, the input current is approximately 0.5 to 1A. If both a and b are OK, proceed to test 2.

 

INPUT CURRENT

FAILURE CODE

Unplug CN703

0.5 to 1A

Oven stops in 37

 

 

seconds after started.

Test 2

Continued from Test 1

1.Unplug the oven’s AC power supply cord from outlet.

2.Unplug 3 pin connector CN701. CN703 remains unplugged.

3.Plug in the oven’s AC power supply cord into outlet.

4.Program DPC.

a.Press Timer/Clock pad twice.

b.Press Start pad once.

c.Press Power Level pad once.

NN-SD698S / NN-ST678S / NN-ST658W

5.Program oven at High power for 1 minute and press [Start] pad.

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

seconds after started.

If both a and b check OK, the Inverter Power Supply (U) can be determined to be OK.

5.6.Temperature thermistor

These sensor monitors the heat produced by the heater circuit and maintains the magnetron temperature which user had selected. Normal room temperature 10°C to 30°C, the reading across the temperature thermistor should be as follows.

TEMP

MAGNETRON THERMISTOR

100°C

30-60K

25°C

700K-1.5M

If the resistance reading is out of the range stated here, the thermistor is detective and must be replaced.

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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 ProcedureInverter power supply U Temperature thermistorTest 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.