IBM Selectric Maintenance Manual page 37

CAUTION: Vertical play in the upper ball socket will
affect vertical alignment and impression because the
type head wi II not maintain a definite position.
Also, care must be taken to insure that the entire rotat.
system is free from binds. A bind in the upper ball sock-
et can result in poor horizontal alignment if the rotate
detent fails to fully seat in the detent notch before print
occurs. An excessive bi nd can cause unwanted roller
droppage in the wear compensator during a negative se-
lection. Binds in the system (carrier area) can be
checked by manually operating the shift arm in and out.
5. Tilt Detent - Adjust the gui de and pivot screw so that
the ti It detent wi II operate freely with no side play
(Fig. 50).
Ti It Detent
FIGURE 50. Ti It Detent Adj ustment
As Little Clearance
As~
Possible, No Binds
~
EARLY STYLE
""
.
As Little Clearance as
Possible, No Binds
Adjust Guides to Obtain
Proper Clearance
FIGURE 51. Rotate Detent Guides
Excessive side play in the tilt detent will cause poor
vertical alignment. A bind in the tilt detent will offect
both the vertical and horizontal alignment because H
will retard or restrict the seating of the tilt detent which,
in turn, will retard or restrict the seating of the rotate
detent.
6. Rotate Detent - Adjust the front and rear guides so that
the rotate detent will operate freely with no side play
(Fig. 51).
Excessive play in the detent will result in poor horizon-
tal alignment because the detent cannot positively po-
sition the typehead.
7. Rocker Shaft - Adjust the rocker shaft left or right to
obtain .002" to .004" side play in the rocker (Fig. 52).
The side play exists between a C-clip around the shaft
at the right of the rocker and a thrust washer against the
carrier casting at the left of the rocker. The rocker
shaft is held in place by a set screw at the left end of
the shaft.
2-14
Excessive play in the rocker could affect horizontal
alignment by allowing the rocker to shift its position
left to right.
FIGURE 52. Rocket Shaft Adjustment
8. Print Sleeve End Play - Adjust the print sleeve end play
to be .002" to .004". The end play is controlled by the
print cam on the right hand end of the sleeve. The ad-
justment should not be gained with the ribbon lift cam
because its set screw tightens down into a dimple in the
print sleeve fixing the position of the cam (Fig. 53).
End Play Adjust by Print Cam
FIGURE 53. Print Sleeve End Play