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Microwave training

VIKING. Preferred Service. Microwave training. ADVANCE. The information provided in this training module covers the operation and programming of the Viking Microwave units NOTE: The information provided is subject to change without notice. Viking Range Corporation – October 2008.

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Microwave training

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  1. VIKING Preferred Service Microwave training ADVANCE

  2. The information provided in this training module covers the operation and programming of the Viking Microwave units NOTE: The information provided is subject to change without notice. Viking Range Corporation – October 2008 Continue

  3. VMOS – DMOS Continue

  4. Above is the wiring schematic for the VMOS – DMOS countertop microwave unit. This drawing shows the oven disconnected from a power source and with the door closed. We will now connect the unit to a power source………

  5. Open the door of the microwave. The Primary, Secondary and Door Sensing Switch contacts open, while the Monitor switch contact closes. If the Primary switch contact fails to open, then a direct short will result, tripping the monitor fuse.

  6. The control board senses the open Door Sensing Switch and activates the RY-1 relay coil. The coil operates on 24 Volts DC. This will allow a neutral path to the oven lamp.

  7. With the RY-1 relay closed, we now have a neutral path for the oven lamp. Now lets close the door and program a cook cycle

  8. Using the keypad on the microwave we will select a 5 minute cook cycle. Using the numbered keys, select 5-0-0 then hit start Using the cursor, select “Start/Touch On” below

  9. With the door closed and a program selected, the control board will activate the RY-1 relay. This will supply a neutral return to the lamp, turntable and the fan motor.

  10. The oven lamp will operate whenever the RY-1 relay is activated. With the Primary Switch closed, we have line voltage to the turntable and fan motor.

  11. The control board will activate the RY-2 relay. This will supply a neutral return to the primary winding of the High Voltage transformer. At the same time, line voltage is supplied to the primary side of the H.V. transformer through the closed circuit in the Secondary Switch.

  12. The secondary of the transformer is made up of two separate sections. The filament section steps down the voltage to 3.5 Volts DC. This is required to heat up the filament within the magnetron tube

  13. The secondary of the transformer is made up of two separate sections. The filament section steps down the voltage to 3.5 Volts DC. This is required to heat up the filament within the magnetron tube The filament will remain active as long as primary voltage is applied to the power transformer.

  14. Microwave HV systems use a process known as the voltage doubling circuit. The high voltage section produces 2300 Volts AC. During the first positive half cycle, the voltage from the transformer travels the path of least resistance, which is through ground, then through the rectifier then into the capacitor where the charge is stored. This occurs at 1/150th of a second. Peak charge in capacitor -2300 volts

  15. During the second negative half cycle, the voltage from the transformer travels into the capacitor. The transformer’s 2300 volts and the stored capacitor voltage of 2300 volts are combined in series, totaling 4600 VDC. Because of the rectifier, the discharged voltage is applied to the magnetron tube. This occurs at 1/80th of a second. This cycle repeats 60 times per second at 60hz. Total Voltage to tube -4600 volts

  16. This concludes the schematic flow on model VMOS - DMOS microwaves Advance

  17. Red wire (com) – from noise filter Orange wire (com) – to oven lamp Brown wire (N.O.) – to fan motor PRIMARY SWITCH Return

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