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MANAGERS AND PROJECTIONISTS 1359
Now you can test with battery and phones or battery and voltmeter. Test from one row of screws to each of the other rows in turn. Then test the other two rows, This will show if a connection exists between the different rows, which should not be the case when the connecting bar has been removed.
To test for an open circuit disconnect the input and output and remove the bar. Test with battery and voltmeter. From one of the input terminals a wire runs directly over to one output terminal. Test from one input terminal to the output terminals; if you get no reading, test from the other input terminal to the output. On one of these tests you should get a reading. Next test from one of these terminals to the three rows of screws. There should be a circuit from the terminal to one row of the screws. Now see that you get a reading at the last screw on each end of this row. When you cannot get a reading by testing from the input or output to any row of the screws, there is a break in the wiring from this series of resistances to the input or output. If there is an indication of a circuit from one of the end screws but there is no voltage at the other end screw in the same row, one of the resistances has become open circuited. To determine which one it is, begin at one end of the row and test from the first screwto the one next to it. Then from the second screw to the third, and so on until you get to two across which you get no reading. This is the open resistance, and can be temporarily cut out by putting a small wire across the two screws. Sometimes the open coil can be cut out by placing the bar to one side of the break or the other. Of course this can only be done when it does not throw the adjustment too far off of normal."