Bell and Howell 1598, Руководство пользователя

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P a n chromatic TQIII & TQIII Specialist User Manual
Page 8
Projecting the film
20 Advance the function switch to "3". The film will now begin to move through the projector.
When the whole of the leader section has passed the entry roller "4"— or, on a professionally
made film, a second after the last number on the printed leader has passed under this roller -
advance the switch one more click to light the projection lamp and throw the picture on the
screen.
Your projector gives you a choice of two light intensities. When the switch bar is pointing to the
first lamp symbol, the lamp receives less than the voltage for which it is designed. In this under-
run condition, the life of the average lamp will be usefully prolonged. For economy, therefore, use
the first position whenever it gives a sufficiently bright picture. For the maximum light, turn the
switch fully clockwise; the lamp will now receive the correct voltage and, in consequence, have
the normal life expectancy.
In addition to this useful "economy" setting of the lamp, the projector has an exclusive safety
device to warn you if, because of variations in the supply voltage, the lamp is being over-run. In
some localities and at certain times of day, the mains supply may rise appreciably above the
nominal value, so reducing the life expectancy of the lamp. Should this happen when you are using
a TQlll Specialist projector, you will be warned that action is required by the flashing of the red
excess voltage indicator 20a.
If this indicator flashes when the projection lamp is being run at full brightness, immediately turn
the switch back to the first, "economy", position. If the flashing persists, switch the projector off,
disconnect the power lead connector from its receptacle, and inspect the voltage selector 3a. If the
selector is not at the normal setting for your nominal supply voltage, as shown by the centre
column of the table below, correct it before resuming projection. If the setting is already "normal",
try the alternative setting if one is given in the right-hand column.
NOMINAL NORMAL ALTERNATIVE
VOLTAGE SETTING SETTING
100 100 110
110 110 130
115-130 130 -
200 200 220
208-220 220 240
225-240 240 250
250 250 -