Viking DMOC205SS, VMOC205SS service manual Description and Function of Components

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DMOC205SS

VMOC205SS

DESCRIPTION AND FUNCTION OF COMPONENTS

DOOR SENSING AND PRIMARY INTERLOCK SWITCHES

The door sensing switch in the secondary interlock system is mounted in the upper position on the latch hook, the primary interlock switch is mounted in the lower position on the latch hook. They are activated by the latch heads on the door. When the door is opened, the switches interrupt the circuit to all components. A cook cycle cannot take place until the door is firmly closed thereby activating both interlock switches. The secondary interlock system consists of the door sensing switch and secondary interlock relay located on the control circuit board.

LATCH HOOK

THIRD DOOR SWITCH

DOOR SENSING

SWITCH

MONITOR SWITCH

LATCH

HEADSPRIMARY

INTERLOCK SWITCH

SWITCH LEVER

OPEN LEVER

DOOR OPEN

BUTTON

Figure D-1. Door sensing switch, monitor switch, third door switch and primary interlock switch

MONITOR SWITCH

The monitor switch is mounted on the middle position of latch hook. It is activated (the contacts opened) by the lower latch head while the door is closed. The switch is intended to render the oven inoperative by means of blowing the monitor fuse when the contacts of the relay RY1 and primary interlock switch fail to open when the door is opened.

Functions:

1.When the door is opened, the monitor switch contact close (to the ON condition) due to their being normally closed. At this time the door sensing and primary interlock and third door switches are in the OFF condition (contacts open) due to their being normally open contact switches.

2.As the door goes to a closed position, the monitor switch contacts are first opened and then the door sensing switch, third door switch and the primary interlock switch contacts close. (On opening the door, each of these switches operate inversely.)

3.If the door is opened, and the relay RY1 and the primary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK SWITCH, RELAY(RY1) AND MONITOR SWITCH FOR PROPER OP- ERATION. (REFER TO CHAPTER “TEST PRO- CEDURE”).

NOTE: MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY.

THIRD DOOR SWITCH

The switch is activated by the latch heads, while the door is closed. When the door is opened, the switch interrupt the circuit to the power transformer. This switch prevents power transformer engaging and microwave when the door opened.

THERMISTOR

The thermistor is a negative temperature coefficient type. The temperature in the oven cavity is detected through the resistance of the thermistor, and then the control unit causes the heater relay to operate, thus the current to the heating element is turned ON/OFF.

MAGNETRON THERMAL CUT-OUT

The thermal cut-out located on the waveguide is designed to prevent damage to the magnetron if an over heated condition develops in the magnetron due to cooling fan failure, obstructed air guide, dirty or blocked air intake, etc. Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached within the magnetron, the thermal cut-out will open at 257οF (125οC) causing the oven to shut down. magnetron thermal cut-out is not reset at room temperature.

OVEN THERMAL CUT-OUT

The thermal cut-out located on the side of the steam duct is designed to prevent damage to the unit if the foods in the oven catch fire due to over heating produced by improper setting of cooking time or failure of control unit.

Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached within the oven cavity, the thermal cut-out will open at 302οF (150οC) causing the oven to shut down.

When the thermal cut-out has cooled, the thermal cut-out closes at 266οF (130οC)

CONV. THERMAL CUT-OUT

The thermal cut-out located on the left side of the thermal protection plate (left) is designed to prevent damage to the heater unit if an over heated condition develops in the tube due to cooling fan failure, obstructed air ducts, dirty or blocked air intake, etc.

Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached within the heater unit, the thermal cut-out will open at 302οF (150οC) causing the oven to shut down.

When the thermal cut-out has cooled, the thermal cut-out closes at 266οF (130οC)

HEATING ELEMENT

The heating element is located at the left side of the oven cavity. It is intended to heat air driven by the convection fan. The heated air is kept in the oven and force-circulated and reheated by the heating element.

CONVECTION COOKING SYSTEM

This oven is designed with a hot air heating system where food is not directly heated by the heating element, but is heated by forced circulation of the hot air produced by the heating element.

The air heated by the heating element is circulated through the convection passage provided on the outer casing of the

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Contents Models DMOC205SS VMOC205SS Table of ContentsBefore Servicing DMOC205SS VMOC205SS Before Servicing When the testing is completedLeakage test without enclosure Microwave Measurement Procedure CanadaLeakage test with enclosure installed RequirementsLeakage test Microwave Measurement Procedure USAIf provided, Vent Hood, Fan assembly, Cooling Fan Motor Viking Range CorporationMicrowave Ovens DMOC205SS VMOC205SS Foreword Specification DescriptionHigh MIX. Roast VMOC205SS Oven DiagramOFF Condition Power Level P-0 to P-90 CookingOperation Description of Operating SequencePreheating Condition Convection Cooking ConditionAutomatic MIX Cooking Condition Sensor Cooking ConditionCooking Sequence Fire Sensing Feature Microwave ModeCompu Defrost Cooking Compu BROIL/ Compu ROAST/ Compu BakeFigure O-1. Oven Schematic-OFF Condition Schematic DiagramFigure O-3. Oven Schematic-Automatic Mix Cooking Condition Description and Function of Components Damper Operation Troubleshooting GuideDamper OPEN-CLOSE Mechanism Microwave CookingProblem Test ProcedurePower Transformer Test High Voltage Rectifier TestHigh Voltage Capacitor Test Secondary Interlock System Test Test Procedures Letter Component TestPrimary Interlock Switch and Third Door Switch Test Monitor SwitchThermistor Test Damper Switch TestChecking Temperature in the Convection Mode Heating Element TestNoise Filter Test Touch Control Panel Assembly TestCompu Defrost Test Test Procedures Letter Component Test KEY Unit TestWeight 1ST Stage 2ND Stage 3RD Stage 4TH Stage Level Time Relay TestWater load cooking test Steps Occurrence Cause or CorrectionAH Sensor Test Checking the initial sensor cooking conditionChecking Control Unit Testing Method for AH Sensor AND/OR Control UnitLSIIXA103DR Touch Control Panel AssemblyDescription of LSI ThermistorCooling fan motor driving signal Temperature measurement input Oven ThermistorDigit selection signal Convection motor driving signalTOR Segment data signals Segment data signalKey strobe signal Structure of Absolute Humidity Sensor Absolute Humidity Sensor CircuitServicing Magnetron Removal Component Replacement and Adjustment ProcedurePower Transformer Removal Outer Case RemovalHigh Voltage Capacitor Removal High Voltage Rectifier Assembly RemovalPositive Lock Connector NO-CASE Type Removal Damper Assembly RemovalHeating Element Removal Oven Lamp and Lamp Socket RemovalFAN Motor Removal Thermistor RemovalPower Supply Cord Replacement Control Panel Assembly and Control Unit RemovalControl Unit and KEY Unit Removal Door Replacement and AdjustmentAdjustment After adjustment, check the followingDoor Disassembly Door AdjustmentAfter adjustment, make sure of the following Requirement Microwave Measurement ProcedurePreparation For Testing Leakage test Leakage Test with Enclosure InstalledFigure S-1. Pictorial Diagram SFigureControl Panel DIP Control Panel Parts Parts ListElectrical Parts Cabinet 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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