Panasonic NN-ST678S manual Simple WAY of H.V. INVERTER/MAGNETRON Troubleshooting, Purpose, Set-up

Page 22

NN-SD698S / NN-ST678S / NN-ST658W

8.4.SIMPLE WAY OF H.V. INVERTER/MAGNETRON TROUBLESHOOTING

Purpose:

Simple way (3/37 seconds rule) of identifying whether it’s Magnetron, Inverter or others.

Set-up:

The unit under question is connected through the Ammeter as shown below.

Procedure:

Follow the matrix table below to identify the problem source.

Note:

Do not replace both Inverter board and Magnetron simultaneously and automatically without going through this procedure.

Power will:

 

Ammeter reading is:

 

To do:

Remedy:

Shut off in 37 seconds

1.

Between 0.5A and 1.0A.

Check and repair open magnetron circuit

Open magnetron wiring between Inverter

after “Start”.

 

 

 

 

and magnetron terminal.

 

2.

Between 1.0A and 2.0A.

Check continuity of D702 in Inverter PCB.

 

 

 

 

 

 

 

 

 

 

1.

D702 shorted

Replace H.V.Inverter(F606Y8M00AP)

 

 

 

2.

D702 is OK

Replace magnetron

Shut off in 3 seconds

1.

Less than 0.5A

Check open circuit: Latch Switch, DPC,

Replace defective component(s), or

after “Start”

 

 

Power Relay and CN701

correct switch, cables and connectors.

8.5.H.V.INVERTER BOARD MAIN PARTS LIST (F606Y8M00AP)

Ref. No.

 

Part No.

Part Name & Description

Pcs/Set

Remarks

DB701

 

B0FBBS000001

BRIDGE DIODE

1

20A, 600V

L701

 

F50206G00AP

CHOKE COIL

1

 

Q701

 

B1JAGV000015

TRANSISTOR SI

1

1000V

T701

 

A609A8M00AP

H.V. TRANSFORMER

1

(INCLUDING D701,D702,C706,C707)

C701

 

ECWF5284N300

CAPACITOR

1

0.28µF/500V

C702

 

ECWF2455N644

CAPACITOR

1

4.5µF/250V

22

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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 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 SwitchTemperature thermistor Inverter power supply UTest 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
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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.