Viking VMOS200, DMOS200 Touch Control Panel Servicing, Servicing Tools, Other Precautions

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CDMOS200

DMOS200

VMOS200

CVMOS200

TOUCH CONTROL PANEL 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

2.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 AND PRESENTS A HAZARD. Therefore, before checking the performance of the touch control panel,

1)Disconnect the power supply cord, and then remove outer case.

2)Open the door and block it open.

3)Discharge high voltage capacitor.

4)Disconnect the leads to the primary of the power transformer.

5)Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

6)After that procedure, re-connect the power supply cord.

After checking the performance of the touch control panel,

1)Disconnect the power supply cord.

2)Open the door and block it open.

3)Re-connect the leads to the primary of the power transformer.

4)Re-install the outer case (cabinet).

5)Re-connect the power supply cord after the outer case is installed.

6)Run the oven and check all functions.

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, 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 activates 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 activates 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).

3.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

4. Other Precautions

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

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

3)After aluminium 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 CDMOS200 VMOS200Before Servicing CDMOS200 VMOS200 CVMOS200 When the testing is completed Before ServicingMicrowave Measurement Procedure Canada Leakage test with enclosure installedRequirements Leakage test without enclosureMicrowave Measurement Procedure USA Leakage testMicrowave Ovens DMOS200 CDMOS200 VMOS200 CVMOS200 Foreword If provided, Vent Hood, Fan assembly, Cooling Fan MotorViking Range Corporation Specification General InformationDescription Grounding InstructionsVMOS200 model shown Oven DiagramMove the Round Grounding Prong from this Plug Power Level P-0 to P-90 Cooking OperationDescription of Operating Sequence OFF ConditionSensor Cooking Condition Cooking SequenceSchematic Door Closed Clock Appears on Display Imar Y IT C H C O Ndar Y S W IT C HDescription and Function of Components Troubleshooting Guide Test Procedures Test ProcedureProblem Procedure Letter Component Test Magnetron Assembly TestPower Transformer Test Procedure Letter Component TestMicrowave Output Power Procedure Letter Component Test High Voltage Rectifier Test Cavity Temperature Fuse TestMagnetron Temperature Fuse Test High Voltage Capacitor TestDoor Sensing Switch Monitor Switch TestSecondary Interlock System Test Secondary Interlock Relay RY2Blown Monitor Fuse Test Touch Control Panel Assembly TestBefore testing Test Procedures KEY Unit TestCompu Defrost Test Weight 1ST Stage 2ND Stage Level TimeRelay Test Occurrence Cause or Correction Steps Occurrence Cause or CorrectionTesting Method for AH Sensor and /OR Control Unit AH Sensor TestChecking the initial sensor cooking condition Water load cooking testProcedure Letter Component Test Checking Control Unit Procedure Letter Component Test Noise Filter Test Measuring Point Indication of OHM-METERTouch Control Panel Assembly LSIIXA098DR Signal synchronized with commercial power source frequency Key strobe signalSignal coming from touch key Signal similar to P17Power source voltage GND0V Internal clock oscillation frequency control input settingPin No AH sensor inputSegment data signal Common data signal COM10SEG COM7 OUTAbsolute Humidity Sensor Circuit Structure of Absolute Humidity SensorServicing Tools Other PrecautionsTouch Control Panel Servicing Component Replacement and Adjustment Procedure Outer Case RemovalPower Transformer Removal Re-installHigh Voltage Rectifier and High Voltage Capacitor Removal Magnetron RemovalPositive Lock Connector NO-CASE Type Removal Control Panel Assembly RemovalOven Lamp and Lamp Socket Removal Turntable Motor RemovalAH Sensor Replacement RE-INSTALLCooling FAN Motor Removal RemovalDoor Replacement After adjustment, check the followingSealer Film After any service, make sure of the followingInstallation Diagram HIG H Voltag E C OmponeFigure S-2 Power Unit Circuit Circuit Figure S-3 CPUUnitFigure S-5 Printed Wiring Board of Power Unit Parts List Electric PartsCabinet Parts Control Panel PartsSCREWS,NUTS and Washers Door PartsMiscellaneous Oven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous Packing and Accessories Copyright 2002 by Viking
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CVMOS200, CDMOS200, DMOS200, VMOS200 specifications

The Viking VMOS200, DMOS200, CDMOS200, and CVMOS200 are advanced products designed for telecommunications and power management applications. Each model showcases unique features and technologies that make them stand out in their respective fields.

The VMOS200 is built on the vertical MOSFET technology, allowing for optimized performance in high-power applications. This device excels in switching capabilities and minimizing conduction losses, leading to improved efficiency. The VMOS200 is ideal for use in power amplifiers and high-frequency applications, where reliable performance and thermal stability are crucial. Its rugged design ensures that it can withstand harsh environments, making it a preferred choice for industrial and aerospace applications.

Next, the DMOS200 employs a double-diffused MOSFET technology, which enhances its thermal performance and power handling capabilities. This model is particularly effective in low-voltage applications where efficiency is paramount. The DMOS200 features a low on-resistance characteristic, allowing for reduced energy loss during operation. Its fast switching speed enables high-frequency operation, making it suitable for RF amplifiers and motor drives.

The CDMOS200 introduces a charge-balanced design, optimizing the allocation of charge carriers within the device to minimize heat generation and improve efficiency. This model is tailored for demanding applications in communications where signal integrity and power efficiency are critical. With its high breakdown voltage and robust construction, the CDMOS200 can handle more demanding operational conditions, making it popular in cellular and satellite communication systems.

Lastly, the CVMOS200 combines the advantages of vertical and charge-balanced technologies, offering a versatile solution for a broad range of applications. This hybrid design provides high efficiency, exceptional reliability, and enhanced thermal management. The CVMOS200 is particularly well-suited for switching power supplies and audio amplification. Its compact footprint allows for integration into space-constrained designs while maintaining high performance.

In summary, the Viking series of devices—VMOS200, DMOS200, CDMOS200, and CVMOS200—offer a range of features, technologies, and characteristics tailored to meet the demands of modern power electronics and telecommunications. With their robust designs, high efficiency, and adaptability to various applications, these devices are integral components for engineers and designers looking to create cutting-edge technological solutions.
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