For a change-over, turn on the motor of the incoming projector at the sight
of the cue and almost immediately afterwards turn on the lamp of this projector, at
the same time turning off the lamp on the other projector. A short time afterwards,
or as long as the cue dictates, fade over the sound. When the film is run out of the
outgoing projector, turn off the motor. This difference in procedure is necessitated
by the aforementioned points of difference, and are important. If the projectors
are set just far enough apart so that each projector switch can be reached at one
time by stretching out the arms when standing between them, these operations are
quite easily carried out.
280. Location of Troubles. -It is the purpose of the trouble chart to list, in
tabulated form, troubles which may possibly occur, and the suggested remedy which
in most casts can be effected quickly. The method and procedure are similar to that
for other equipments.
The trouble chart is for the purpose of aiding the operator in locating the cause
of "no-sound," low volume, poor quality and noisy operation. In case of "no sound,"
before referring to the chart, check the operating procedure and see that no error was
made in setting up, check all cable connections and check to see that the exciter lamp
of the "faded in" projector is lighted and that all tubes in the amplifier unit are
281. Use of Trouble Charts. -When -using the chart look along the left-hand
column for the section corresponding to the type of trouble experienced, then look
in the "Indication" column and note if any of the items listed there correspond to
the nature of the trouble found. The "Cause" column should then be consulted for
the probable cause of the trouble, and the "Remedy" column for the suggested