IBM Selectric Reference Manual

12. Printers Without Dual Velocity
a. Powered Travel - With the cycle shaft latched at
rest and the impression control lever set at position
5
and the copy control lever set at 5 (all the way
back), loosen the binding screw and move the de-
tent plate forward or backward unti I a clearance of
.250" exists between the platen and the center of
the II home II character (Fig. 142.14). This clear-
ance may be measured with the foot of the Hoover-
ometer which is approximately .250". When
measuring the adjustment, remove the tilt ring
play by depressing the typehead I ightly toward
the front of the mach i ne .
Hooverometer
FIGURE 142.14 Powered Travel
b. Free Flight - Set the impression control lever at 5
and the copy control lever at 4 and hand-cycle the
machine unti I the print cam follower is resting on
the high point of the print cam. At this point,
there should be .035" of free flight between the
platen and the center of a hal f-cycled "home"
character. Adjust the eccentric on the impression
control
lever for this clearance (Fig. 142.15) 0
Keep the high part of the eccentric toward the
front of the machine.
13. Printers With Dual Velocity
a. Powered Travel - With the cycle shaft latched at
rest and the impression control lever set at 4 and
the copy control lever all the way forward, loosen
the binding screw and move the detent plate for-
ward or back until a clearance of .250" exists be-
tween the platen and the center of the "home"
character (Fig. 142.14). This clearance can
easil y be measured with the foot of the Hoover-
ometer which is approximately .250". When
measuri ng the adjustment, remove the ti It ring
play by depressing lightly on the rear of the tilt
ring.
b. Free Flight - Set the impression control lever ot 4
and the copy control lever all the way forward
and hand-cycle the machine unti I the print cam
follower
roller is resting on the high point of the
cam. At this point .035" of free flight should
exist between the platen and the center of the
"home" character. Adjust the eccentric on the
impression control lever to obtain this condition
(Fig. 142.15). Keep the high part of the eccen-
tri c forward.
NOTE: The pusher end of the large spring hook
measures
approximately .033" and may be used to
gauge this clearance. When measuring this clear-
ance, remove the tilt ring play by depressing the
typehead I ightly toward the front of the machine.
Large Spring Hook
Impression Control Lever ~
Eccentri c
FIGURE 142015 Free Flight
CAUTION: Each of these adjustments (powered
travel and free flight) directly affect each other
and must be adjusted alternately until both are
correct .
14. Dual Velocity Magnet Assembly (Removed)
a . Ad
i ust the pi vot pi ate for .001" to .003" betwee n
the armature and the yoke with the armature attract-
ed (Fig. 142.16). This will ensure a free armature.
2-50

IBM Selectric Specifications

General

Type	Electric typewriter
Introduced	1961
Keyboard Layout	QWERTY
Carriage Return	Electric
Manufacturer	IBM
Printing Technology	Typeball (golf ball)
Power Source	AC Power
Power Supply	120V AC