IBM Selectric Reference Manual

8.
Power Frame
FIGURE
32. Magnet Unit Position
This adjustment insures that the pusher does not contact
its latch extension when the pusher is against its arma-
ture during a print cycle. If allowed to touch mal-
selection wi II result.
Mounting Bracket (Fig. 33) - Position under its four
mounting screws for .001" to .010" clearance between
the pusher tails and armatures.
Mtg. Bracket Screws
FI GURE 33. Mounting Bracket Position
NOTE:
9.
Adjustments 7 & 8 are interacting - both requirements
must be satisfied.
Excessive clearance may cause mal-selection since the
armature may not hold the pusher tai I when the magnet
is not energized.
No clearance (the pusher holding the armature away
from rest) can cause mal-selection since the pusher may
not be released when the armature is attracted by its
magnet. Also extra cycles may result since the arma-
ture at rest would be holding the cycle clutch trip bail
partially rotated.
Knock Off Eccentrics (Fig. 34) - Adjust (T2 and R5arm-
atures manually attracted) to clear the trip bail exten-
sions by .003" to .008".
Excessive clearance wi II cause extra cycles due to the
armatures not being knocked off. It is necessary to knock
off the armatures since residual magnetism is present.
Knock-Off Eccentrk
Tr,ip Bai I
©L!
t
.003" - .008"
Extension
FIGURE
34. Knock Off Eccentrics
No clearance wi II cause fai lure to cycle because the
trip bail will not be able to rotate to trip the cycle
clutch.
PRI NT SELECTION MAGNET ASSEMBLY (Late Style)
NOTE: The late style magnet assembly may be identified by
the absence of pivot eccentrics, and the single knock-off
extension (Fig. 34.1).
Knock-Off Extension
FIGURE
34.1 Magnet Assembly
1. Guide Plate (Fig. 34.1) - The position of the guide
plate is predetermined by holes which fit over stamped
projections on the pivot plate.
2. Pivot Plate (Late Style) Fig. 34.2 - Adjust for a clear-
ance of .002" to .005" between the yoke and armatures
with the armatures manua II y attracted. Measure clear-
ance of the outside armatures (T2 & R5).
Armature Manually Attracted
T
.002" to .005"
FIGURE 34.2 Pivot Plate
3. Armature Stop (Late Style - With the armature manually
attracted, adjust armature stop for a clearance of
.003" to .007
11
between the armature and yoke
(Fig. 34.3).
2 -9

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