32 THE MICROWAVE SYSTEM

FA F

FILAMENT AND

HIGH VOLTAGE

TERMINALS

ANTENNA

F I G U R E 24: High Voltage Diode

F I G U R E 25: Magnetron

5.While holding the MGTRON soft key, move the sur- vey meter around the outline of the oven door, keeping the tip of the meter in contact with and perpendicular to the oven door. Record the highest leakage.

6.Using the same procedure, measure the leakage with the oven door opened to the point just before the primary and secondary switches disengage. Record the highest leakage.

T I P : To hold the oven door open for this test, back out the top center screw around the perimeter of the oven door. Continue backing this screw out until the primary and secondary interlock switches disengage. As this point, tighten the screw until both switches re-engage.

7.Using the same procedure, measure the leakage around the oven’s entire exterior surface. Record the highest leakage.

HOW TO TEST MICROWAVE COMPONENTS

Testing the High-Voltage Diode

The high-voltage diode (Figure 24) is assembled by connecting several 1000-1500 volt semiconductor diodes in a series to increase the reverse voltage capa- bility. In the circuit, the high-voltage diode conducts to prevent the filament voltage from becoming posi- tive, thus as the high-voltage winding of the trans-

former goes to 2400 VPK, the high-voltage capacitor is charged to 2400 volts. When the high-voltage wind- ing starts to go toward negative, the high-voltage diode becomes non-conducting with the charged high-volt- age capacitor in series with the high-voltage winding. When the transformer gets to its negative peak of -2400 VPK, the voltage applied to the filament is negative 4500 volts.

W A R N I N G : Never attempt to measure high voltage directly.

How to Check a Diode

1.Disconnect the oven from the power source.

2.Fully discharge the capacitors.

3.Connect the voltage meter in series with the diode.

4.Using a multimeter set to DC voltage, connect one meter lead to one side of a 9-volt battery and the other lead to one side of the diode.

5.Connect the other side of the 9-volt battery to the other side of the diode. DC voltage should only be present on the meter in one direction.

6.Switch the meter leads on the diode, which will cause the opposite reading to be visible. Depending on the voltage of the battery, voltage between 5-7 VDC should be present in only one direction and 0-0.1 VDC in the other direction.

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Turbo Chef Technologies NGC-1007 service manual Testing the High-Voltage Diode, How to Check a Diode
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NGC-1007 specifications

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