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14 - Preliminary Tests
IV-PIACING INTO SERVICE
Place the tubes in their sockets . Press push button
to "MANUA L" pos ition. Operate toggle switch No. 1 on the control
panel to the position as outlined in para graph 12 and operate the 10-pole transfer sw itch to the correspond ing pos ition. Inspect
the scanner to see that the lenses are clean and that the
mot or shaft is turning freely. Close the ac supply switch.
While the synchronous motor is running disconnect the a-c . supply
voltage and measure the time required for the motor to reacQ
standstill. If this time is less than 8 sec onds , there is too
much fric t ion in the motor bearings and the mot or bearings shoud
be cleaned or replaced . Inspect the tubes to see that the filaments
are glowing with a dull red glow , and ob serve that the
lens es are rotating in direction as specified in table I of
Drawing 2-A-4278 , viewing it from ins ide the scanner case when
the door is open. Check to see that the d-c. revers ing motor
field is supplied with voltage by ob serving tha t there is a
bluish glow in the RCA-83 rectifier tube.
Place a piece of the ma terial without any printing on
the roll below the scanner and turn the potent iometer dial on the
control panel "all inll clockwise to position 100. There should
now be a bluish glow in tube II, and no glow in tube III . If
there is a glow in tube III the scanner is not properly lined up
in relation to the roll, or the ground connections are not properly
made.
15 - Operation of Tubes
To test the operation of the scanner and tubes 'XI and
III, place the material in its norma l position beneath the scanner.
Turn potent iometer to position 100. Place the line or
edge in the approximate diametrical center of the light circle
and move to left and right . Ob serve tube II which should be liON"
as indicated by a bluish glow or " OFF " approx imately within the
regions as indicated by Fig. 1 and 2 of Drawing 2-A-4278 . It
will be noted that tube II will be on or off if the line or edge
is moved slight ly away from the diametrical pos ition. If this
"ON - OFF II position is not approximately in the diametrical position
the location can be changed by turning the lens holder
slight ly in relation to the motor shaft, although this should
not be necessary because adjustment of the lens holder ha s been
made at the factory, and the correct posit ion of the lens holder
is indicated by a mark on the motor shaft oppos ite a mark on the
lens holder bushing .
It may be found in some cases tha t more points of control
ex ist than are shown in Fig. 1 and Fig. 2 of Drawing 2-A-7tB
By turning the potent iometer towards zero this cond ition can be
eliminated.
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