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MANAGERS AND PROJECTIONISTS 1343
live side, of course. To the 150-volt negative terminal of the meter attach a wire long enough to reach to .'ill parts of the PEC amplifier. The fuse itself has already
indicated the faulty circuit, but for additional check, touch the negative lead from the meter to the 45, the 90 and the PEC terminals on the dead side of the switch. Any terminal showing" a reading is connected to the circuit that is grounded.
Let us assume the PEC terminal on the switch to show a reading when the test is made. We may then either look for another ground, or make another test to further locate the trouble before the actual search for it begins.
First, open the transformer housing compartment under the PEC amplifier on the left side of the projector. Disconnect the ware from the PEC terminal. Test the wire and then the terminal itself. The meter reading will indicate in which direction the trouble lies.
Inspect the wires so far as they are visible, looking carefully for spots where the insulation may be defective, especially where the wire goes around a sharp bend. Also make sure that no strands of wire or other currentcarrying objects make contact wdth any of the terminals of the clip on which the coupling resistance is mounted. Carefully inspect the spring which carries the current from the stationary terminal strip on top to the one below. It is the one connected to lug No. 7 on top of the amplifier.
If the trouble be in this section and you experience trouble in locating the exact point, unsolder the wire from lug No. 7 and test both it and the lug. A reading on the lug test indicates a ground in the amplifier itself.