IBM Selectric Manual

a. Platen Height - With the head of the Hooverometer
set
at the '4 scribe line, the platen should just touch
the base of the handle when the head is resting on
the escapement rack (Fig. 71).
Ad just the platen guide bracket eccentrics to obtain
this condition (Fig. 70). The high part of the eccen-
trics should be kept to the rear. It is necessary to
leiTIIJ-Ve the de fleetv. G .. d f.vl.t feed iO!!S whe .. check-
ing the adjustment with the Hooverometer.
NOTE: The Hooverometer should be inserted at a
position just
to the left of the escapement cord drum
when
checking the right side and directly in line
with the rotate-two latch when checking the left
side. The handle of the Hooverometer must be as
nearly vertical as possible during the checks. The
base
of the handle does not reach the center line of
the platen when the handle is vertical, but the di f-
ference in height has been compensated for in the
location of the scribe line.
b. Platen Front to Rear - With the head of the Hoover-
ometer set at the #2 scribe line, the tool should
just span
the distance between the platen and the
print shaft as illustrated in Fig. 72. Adjust the
platen adjusting eccentrics to obtain this condition
(Fig. 70).
FIGURE 72. Front to Rear Platen Adjustment
Check at both ends of the platen. In order to adjust
the platen adjusting eccentrics it is also necessary
to loosen the front screws in the eccentric retaining
pi ates . (Be sure that the Hooverometer does not rest
on
the pri nt shaft keyway.)
NOTE: After the correct vertical and horizontal
positions ofthe platen are obtained with the Hoover-
ometer, the vertical position may be refined to pro-
vide even printing between the tops and bottoms of
the characters. Check at both ends of the writing
line.
CAUTION: Any change in the front to rear posi-
tionofthe platen necessitates a readjustment of the
velocity control plate and anvi I. Also, any change
in the platen position may alter the paper feed ad-
justments. All paper feed adjustments should be
checked and readjusted if necessary.
5.
28
Carrier Shoe Ad justment
a. Carrier Shoe (Old Style) - Adjust the upper carrier
shoe eccentric mounting stud to provide .001" to
. 004" vertical motion of the carrier at the rear
(Fig. 73). Check at several points along the writing
line.
Thi~ l)mollnt of play insures free lateral movement
ofthe carrier yet restricts the vertical movement to
help prevent variation in the vertical alignment of
the 'type.
NOTE: The eccentric is accessible with the 3"
screwdriver throush the opening in the escapement
bracket just above the tab torque bar. The side of
the screwdriver blade should be used if possible.
Carrier Shoe
Escapement Rack
FIGURE 73. Carrier Shoe - Old Style
b. Carrier Shoe (New Style) - Adjust the upper carrier
shoe eccentric mounting stud to provide .002" to
. 006" vertical motion of the carrier at the rear
(Fig. 74) when the spring load on the upper shoe is
suppressed.
FIGURE 74. Carrier Shoe - New Style
NOTE: The vertical motion may be felt by firmly
moving
the carrier up and down at the rear, so as
to overcome the effects of the spring load on the
upper shoe.

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