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In the R. B. Lab.
7*
ache, but rather he observes the symptoms and through a sequence of thought and experiment establishes just what and where the trouble is. Likewise in radio a few consistent observations, even by the most unexpert member of the family, will often solve the difficulty without calling in an expert.
There are three types of radio difficulties:
Absolute Inoperation Poor Operation Noises
These are general headings and they cover a multitude of the conventional radio sins. In this article we shall begin to treat the first group, not because it is the most prevalent (which is doubtful) but because its treatment is the more definite and simple.
THE SET WON'T WORK
PERHAPS the receiver is turned on in the usual manner but nothing happens. The receivers or loud speaker is dead, and the twisting of dials futile. The first thing to be done is to locate the trouble. The second
task —to be treated next month — is to apply the remedy associated with that particular trouble.
Test No. i — Turn off the bulbs, listening for a click in the phones or speaker. No click indicates a break somewhere in some battery circuit. When there is no click, we proceed to
Test No. 2 — Inspect the bulbs. If they light, the filament circuit is O. K. A very dim, partial light (which however, should give a faint click in Test No. i) suggests a low A battery. One or more bulbs may be " blown ". If the bulbs do not light we try
Test No. 3 — Make a momentary "short" of the binding posts on the set generally marked A-plus and A-minus, with a pair of scissors or any other metal object that is convenient. A spark indicates trouble in the set itself — filament wiring, burnt-out rheostats, loose socket prongs, filament control jack, or an inoperative switch. No spark shows that the trouble is on the battery side — in the leads to the battery, in the batten' terminals, or a dead battery.
If Test No. 2 finds the bulbs normally
fig. 4
"There is no spark, Harry, You 'd better take a look at those battery leads". There are many simple tests that almost any one can make which will show up the more common radio ailments, and suggest a way to remedy the difficulty without calling in an expert