IBM Selectric Reference Manual

Pawl Centered
FIGURE 221. Vertical Adjustment Of Index Selection Cam
INDEX MECHANISM (EARLY STYLE)
1" All operational control adjustments must be correct be-
fore a"ny attempt is made to adjust the index mechanism.
2. Index link and Index link Stud
a. As a preliminary setting position the index link stud
in the middle of the slot in the pawl carrier. The
setti ng provi des an average leverage rati 0 for the
pawl carrier. Subsequent adjustments may require
that the position be altered slightly.
b. With the index selection lever in the single line
space position, adjust the index link so that the in-
dex pawl bottoms in the ratchet against a tooth
after .030" rise on the index cam (Fig. 222). Half-
turn adjustments may be made by disconnecting and
turning the link at the top.
The cam rise may be simulated by leaving the cam
latched in the rest position and placing four strips
of I BM card stock between the cam and the cam
follower (Fig. 222).
4 IBM Cards
Index Link
Cam Latched At Rest
FIGURE 222. Index Link Adjustment
2-74
c. Adjust the index link stud forward or back in the
slot of the pawl carrier so that one full tooth of
motion is given the index pawl after it starts to
drive the platen (Fig. 223).
Cam At High Point
FIGURE 223. Index link Stud Adjustment
NOTE: Adjustment of the index link and link stud
must be consi dered together. Make these adjust-
ments alternately until both are correct.
The upper index pawl stop must allow the index pawl
to bottom in the ratchet.
3. Upper Index Pawl Stop- With the index cam latched ad-
just the upper index pawl stop so that the index pawl
clears the ratchet by .015" to .030" (Fig. 224).
FIGURE 224. Upper Index Pawl Stop Adjustment

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