Viking VMOC205SS, DMOC205SS service manual Servicing

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DMOC205SS

VMOC205SS

SERVICING

1.Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc, and sometimes it is not fully protected by the built-in protection circuit.

In order to protect CMOS LSI.

1)When storing and transporting, thoroughly wrap them in aluminium foil. Also wrap all PW boards containing them in aluminium foil.

2)When soldering, ground the technician as shown in the figure and use grounded soldering iron and work table.

approx. 1M ohm

2. Shapes of Electronic Components

B

 

Transistor

C

 

DTA123ES

E

 

KRA101M

Transistor

 

E C B

KRA223M

2SB910M

KRC243M

3.Servicing of Touch Control Panel

We describe the procedures to permit servicing of the touch control panel of the microwave oven and the precautions you must take when doing so. To perform the servicing, power to the touch control panel is available either from the power line of the oven itself or from an external power source.

(1)Servicing the touch control panel with power supply of the oven:

CAUTION:

THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING PRESENTS A HAZARD.

Therefore, when checking the performance of the touch control panel, put the outer cabinet on the oven to avoid touching the high voltage transformer, or unplug the primary terminal (connector) of the high voltage transformer to turn it off; the end of such connector must be insulated with an insulating tape. After servicing, be sure to replace the leads to their original locations.

A. On some models, the power supply cord between the touch control panel and the oven itself is so short that the two can't be separated.

For those models, check and repair all the controls (sensor-related ones included) of the touch control panel

while keeping it connected to the oven.

B. On some models, the power supply cord between the touch control panel and the oven proper is long enough that they may be separated from each other. For those models, therefore, it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper; in this case you must short both ends of the door sensing switch (on PWB) of the touch control panel with a jumper, which brings about an operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if dummy resistor(s) with resistance equal to that of the controls are used.

(2)Servicing the touch control panel with power supply from an external power source:

Disconnect the touch control panel completely from the oven proper,and short both ends of the door sensing switch (on PWB) of the touch control panel,which brings about an operational state that is equivalent to the oven door being closed. Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel it is also possible to check the sensor- related controls of the touch control panel by using the dummy resistor(s).

4.Servicing Tools

Tools required to service the touch control panel assembly.

1)Soldering iron: 30W

(It is recommended to use a soldering iron with a grounding terminal.)

2)Oscilloscope: Single beam, frequency range: DC - 10MHz type or more advanced model.

3)Others: Hand tools

5. Other Precautions

1)Before turning on the power source of the control unit, remove the aluminum foil applied for preventing static electricity.

2)Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted.

3)After aluminum foil is removed, be careful that abnormal voltage due to static electricity etc. is not applied to the input or output terminals.

4)Attach connectors, electrolytic capacitors, etc. to PWB, making sure that all connections are tight.

5)Be sure to use specified components where high precision is required.

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Contents Table of Contents Models DMOC205SS VMOC205SSBefore Servicing DMOC205SS VMOC205SS When the testing is completed Before ServicingRequirements Microwave Measurement Procedure CanadaLeakage test with enclosure installed Leakage test without enclosureMicrowave Measurement Procedure USA Leakage testIf provided, Vent Hood, Fan assembly, Cooling Fan Motor Viking Range CorporationMicrowave Ovens DMOC205SS VMOC205SS Foreword Specification DescriptionHigh MIX. Roast Oven Diagram VMOC205SSDescription of Operating Sequence Power Level P-0 to P-90 CookingOperation OFF ConditionSensor Cooking Condition Convection Cooking ConditionAutomatic MIX Cooking Condition Preheating ConditionCompu BROIL/ Compu ROAST/ Compu Bake Fire Sensing Feature Microwave ModeCompu Defrost Cooking Cooking SequenceSchematic Diagram Figure O-1. Oven Schematic-OFF ConditionFigure O-3. Oven Schematic-Automatic Mix Cooking Condition Description and Function of Components Microwave Cooking Troubleshooting GuideDamper OPEN-CLOSE Mechanism Damper OperationTest Procedure ProblemPower Transformer Test High Voltage Rectifier TestHigh Voltage Capacitor Test Monitor Switch Test Procedures Letter Component TestPrimary Interlock Switch and Third Door Switch Test Secondary Interlock System TestHeating Element Test Damper Switch TestChecking Temperature in the Convection Mode Thermistor TestTouch Control Panel Assembly Test Noise Filter TestRelay Test Test Procedures Letter Component Test KEY Unit TestWeight 1ST Stage 2ND Stage 3RD Stage 4TH Stage Level Time Compu Defrost TestChecking the initial sensor cooking condition Steps Occurrence Cause or CorrectionAH Sensor Test Water load cooking testTesting Method for AH Sensor AND/OR Control Unit Checking Control UnitThermistor Touch Control Panel AssemblyDescription of LSI LSIIXA103DRConvection motor driving signal Temperature measurement input Oven ThermistorDigit selection signal Cooling fan motor driving signalTOR Segment data signals Segment data signalKey strobe signal Absolute Humidity Sensor Circuit Structure of Absolute Humidity SensorServicing Outer Case Removal Component Replacement and Adjustment ProcedurePower Transformer Removal Magnetron RemovalDamper Assembly Removal High Voltage Rectifier Assembly RemovalPositive Lock Connector NO-CASE Type Removal High Voltage Capacitor RemovalThermistor Removal Oven Lamp and Lamp Socket RemovalFAN Motor Removal Heating Element RemovalPower Supply Cord Replacement Control Panel Assembly and Control Unit RemovalControl Unit and KEY Unit After adjustment, check the following Door Replacement and AdjustmentAdjustment RemovalDoor Disassembly Door AdjustmentAfter adjustment, make sure of the following Leakage test Leakage Test with Enclosure Installed Microwave Measurement ProcedurePreparation For Testing RequirementFigure S-1. Pictorial Diagram SFigureControl Panel DIP Cabinet Parts Parts ListElectrical Parts Control Panel PartsDoor Parts MiscellaneousScrews Nuts and Washers LX-NZ0029YBE0 Oven and Cabinet Parts Control Panel Parts Door Parts Packing and Accessories DMOC205SS VMOC205SS Copyright 2004 by Viking

VMOC205SS, DMOC205SS specifications

The Viking DMOC205SS and VMOC205SS are two state-of-the-art microwave ovens that redefine cooking convenience and efficiency. Designed for modern kitchens, these appliances come equipped with a range of features and technologies that enhance their usability and performance.

One of the most notable aspects of the Viking DMOC205SS and VMOC205SS is their powerful cooking capabilities. Both models utilize an advanced cooking system that ensures even heat distribution, resulting in perfectly cooked meals every time. With a robust wattage of up to 1,200 watts, these microwaves can quickly and efficiently prepare a wide variety of dishes.

The DMOC205SS features a spacious interior, offering 2.1 cubic feet of cooking space, making it ideal for larger families or those who frequently entertain guests. The VMOC205SS variant also shares a similar capacity but comes with additional features tailored for versatility. The interior design of both models includes a stainless steel finish that not only enhances durability but also adds a touch of elegance to any kitchen.

Functionality is at the forefront of the Viking DMOC205SS and VMOC205SS. Both models are equipped with multiple cooking modes, including microwave, convection, and grilling options. This multi-functional capability allows users to seamlessly switch between cooking methods, ensuring optimal results for various recipes. The intuitive control panel features easy-to-read buttons and a digital display, making it user-friendly for all cooking levels.

In terms of technology, these Viking microwaves incorporate sensor cooking, which automatically detects the moisture and temperature of food, adjusting cooking times accordingly. This feature not only prevents overcooking but also ensures consistently delicious results. The models also come with pre-programmed cooking settings for popular dishes, making meal preparation simpler and quicker.

Energy efficiency is another critical aspect of the Viking DMOC205SS and VMOC205SS. Both models are designed to minimize energy consumption while maximizing performance, which is beneficial for both the environment and the homeowner’s energy bills.

Safety features are embedded within the design of these microwaves. They include a child lock function to prevent accidental use, as well as a timer that ensures food is cooked for the precise amount of time needed.

In summary, the Viking DMOC205SS and VMOC205SS are exceptional microwave ovens that combine advanced technology, practical features, and stylish design. Their powerful cooking capabilities, user-friendly controls, and energy-efficient operation make them a perfect addition to any modern kitchen. These appliances empower users to explore a wide range of cooking possibilities, bringing convenience and quality to meal preparation.
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