Panasonic NN-ST658W, NN-SD698S, NN-ST678S manual Component Test Procedure, Monitor Interlock Switch

Page 14

NN-SD698S / NN-ST678S / NN-ST658W

5 COMPONENT TEST PROCEDURE

WARNING

1.High voltage is present at the output terminals of the High Voltage Inverter (U) including aluminum heat sink during any cook cycle.

2.It is neither necessary nor advisable to attempt measurement of the high voltage.

3.Before touching any oven components, or wiring, always unplug the power cord and discharge the high voltage capacitors (see page 8).

5.1.Primary, Secondary Latch Switch interlocks & Power Relay RY1

1.Unplug lead connectors to Power Relay RY1 and verify open circuit of the Power Relay RY1 1-2 terminals.

2.Unplug lead connectors to Primary Latch Switch and Secondary Latch Switch.

3.Test the continuity of switches at door opened and closed positions with ohm meter (low scale).

Normal continuity readings should be as follows.

 

Door Closed

Door Opened

Primary Latch Switch

0Ω (Close)

Ω(Open)

Secondary Latch Switch

0Ω (Close)

Ω(Open)

Power Relay RY1

Ω (Open)

Ω(Open)

5.2.Monitor Interlock 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 Interlock Switch with door opened and closed positions using lowest scale of the ohm meter.

Normal continuity readings should be as follows.

Door Opened

Door Closed

0Ω (Close)

Ω (Open)

5.3.Magnetron

Continuity checks can only indicate an open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron.

1.Isolate magnetron from the circuit by disconnecting the leads.

2.A continuity check across magnetron filament terminals should indicate one ohm or less.

3.A continuity check between each filament terminal and magnetron case should read open.

5.4.key board membrane (Membrane switch assembly)

Check continuity between switch terminals, by tapping an appropriate pad on the key board. The contacts assignment of the respective pads on the key board is as shown in digital programmer circuit.

14

Page 13 Page 15
Image 14
Page 13 Page 15
Contents NN-SD698S NN-ST678S NN-ST658W NN-SD698S / NN-ST678S / NN-ST658W NN-SD698S / NN-ST678S / NN-ST658W Contents Schematic Diagram Description of Operating Sequence Variable power cooking controlInverter power supply circuit Inverter defrostExplanation of the Auto Sensor Cooking process Sensor reheatThermistor Balance of cooking time T2 timeInverter warning Check the groundingInverter warnings Grounding of the inverter circuit boardSharp edges Part replacementVerification after repair Discharging the high voltage capacitorsDigital programmer circuit D.P.C Disassembly and Parts Replacement ProcedureMagnetron To replace membrane key boardTo re-install components Low voltage transformer and/or power relays RY1, RY2Door assembly 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 usedProcedure Simple WAY of H.V. INVERTER/MAGNETRON TroubleshootingH.V.INVERTER Board Main Parts List F606Y8M00AP 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
Related manuals
Manual 60 pages 50.3 Kb

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.
Top Page Image Contents