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1346 HANDBOOK OF PROJECTION FOR
wire that was soldered to lug No. 7, already disconnected to find which half the trouble is in, to lug No. 1, again leaving two parts disconnected, namely lugs No. 1 and 6.
Using only half of the primary, temporarily of course, we will lose a good deal in the amplification, especially of the lower notes. However, no other trouble will result and the connection may continue until a new half can be installed in place of the faulty one.
TROUBLE AT 90VOLT TAP.— Trouble at the 90-volt tap indicates fault in the V3 circuit, which is very similar to the V2, except that the voltage is 90 instead of 45. Also the transformer is called the "Output" instead of the "Input" transformer. The lugs are differently numbered also.
The testing method is exactly the same ; however, do not forget that we must not use the same lug numbers, but corresponding lugs instead. Five (5) is the input battery terminal in the input transformer, which lug of the output is No. 7. You may clear this all up by examining the wiring diagram on the cover.
Should it ever happen that both halves of the primary of the input transformer become either grounded or "open," which same may happen if the part between lugs 2 and 1 become grounded, the rush of current due to the ground burning out the section between lugs 6 and 5, the transformer should be replaced with a new one.
WARNING. — Do not attempt to substitute transformers from other apparatus. Use only the transformer supplied for the purpose by the manufacturer of the equipment.