IBM Selectric Reference Manual

4.
5.
6.
Multiplying Control Lever.
a. As a preliminary setting, position the multiplying
control lever stop front to rear so that its elongated
hole is centered (Fig. 225). The adjustment pro-
vides an average leverage ratio for the multiplying
lever. Subsequent adjustments may require that the
front to rear position be changed slightly.
b. Adjust the multiplying control lever vertically to
just clear the bottom edge of the multiplying lever
when it is moved from the single to the double index
posi tion. The adjustment shou Id be made with the
index cam latched. Keep the high point of the
eccentri c toward the front of the mac hi ne.
c. Adjust the multiplying control lever stop front to
rear so that two full teeth of motion is given the in-
dex pawl after it starts to drive the platen (Fig.
225) •
CAUTION: Be sure that the indexing acti.on is not
choked off by the platen overthrow stop.
Platen Overthrow Stop - Adjust the stop forward or back
so that •. 005" clearance exists between the stop and the
pawl when the cam is on its high point (Fig. 225).
Index Selection Lever - Adjust the index selection lever
link so that the lever lines up with i'he double rrfark on
the case· when the lever is in the double line space po-
siti on (Fig. 225).
Multiplying Control Lever Stop-.-:-II----"'P"'I
FIGURE 225. Index Travel Adjustment
2-75
1.
2.
TABULATOR SET AND CLEAR MECHANISM
Tab Rack Bellcrank - Adjust the bellcrank attached to
the left end of the tab rack so that an unset tab stop is
centered between the tab lever pawl and the tab set lug
on
the escapement bracket (Fig. 226). Latch the tab
lever to the rear to check this adjustment.
CAUTION: Be sure that the tab set and clear level is
fu II y seated on top of the two pi vot pi ns on the I eft
si de of the powerframe.
Tab Stop Not Set
Escapement Bracket
t
·-r-
... _- Equal Clearance
FIGURE 226. Tab Rack Bellcrank Adjustment
Tab Set and Clear Link - Adjust the link so that the slope
of the keybutton matches the slope of the ON/OFF
switch keybutton with the switch in the OFF position.
NOTE: A link guide found on the 11 inch machine
should be adjusted so that it wi II permit free operation
without allowing the link to flex during a set or clear
operation. The link guide must also be positioned in
the slot of the selector latch bail shaft to maintain the
proper lateral position of the shaft. On 15"
machines the intermediate lever should be vertical
within .015".
3. Set and Clear Arm Stops - For the stop lugs on the set
and clear lever bracket (Fig. 227) so that they limit the
movement of the arm just as the tab stop fu lIy reaches its
set or cleared position. Also, form the extension on the
rear stop lug so the tab set and clear arm cannot pivot
sideways out of engagement with the tab rack bellerank.
NOTE: On the early style tab set and clear mechanism
the stop lugs were anchored and adjusted by two screws
on
the outside of the powerfrarr,e.
~--~
Link --- __ ~U)
Set And C lear Lever
Bracket
The Upper Slot Edges Should
Be Pinched so that the Link
Cannot Accidentally Disengage
FIGURE 227. Set And Clear Arm Stops

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