IBM Selectric Manual

IIRII
+5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5
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Affected By
FIGURE 60. Insufficient Rotate Arm Motion Ratio Change
11. Eccentric Stud Adjustment -(Typehead Homing) Use the
followi ng procedure to ad just the eccentri c stud:
a. Damper spring stop - as a preliminary adjustment,
sl ide the damper spring stop down as low as it wi II
go behind the damper spring (Fig. 61).
FIGURE 61. Damper, Spring Stop - Preliminary
Adjustment
b. Raise the compensator roller all the way to the top
of the V -shaped wedging slot.
c. Half-cycle an upper case II Mil (-5) and adjust the
eccentricstud{Fig. 62) inagainst the machine side-
frame unt i I the II M II detents .010" to .020" in the
negative direction from the center of the detent
notch when the head play is lightly removed in the
negative direction (Fig. 63). Make sure that the
damper spring is fully collapsed against'the machine
sideframe.
After the eccentric stud has been properly adjusted
the compensator roller must be reseated by raising
it to the top of the V-shaped slot and striking a
seriesofIM's". The compensator roller should seat
1/16" down from the top of the slot. I f it drops too
littleortoo much the rotate link should be adjusted
and the roller reseated until the 1/16
11
is obtained.
Having the roller seat 1/16" from the top of the slot
~etsupavertical condition between the compensat-
ing arm and the rotate arm so that the leverage with-
in the arm assembly will be the same for both posi-
tive and negative moVements of the arm.
22
Eccentric Stud
(Make Adjustment Here)
FIGURE 62. Eccentric Stud
r .010" To .020"
I~
Notch In Type Head
\
Adjustment Made Detent
With Eccentric Stud
FIGURE 63. Eccentric Stud

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