IBM Selectric Reference Manual

3.
On long carriage machines the trigger upstop should be
moved up out of the way when making this adjustment.
After completing the adjustment the upstop should be
adjusted so that it clears the trigger lever by .001" to
• 005
11
(Fig. 1858).
This adjustment insures that the trigger wi II properly
reset over the lug on the escapement torque bar at the
completion of each spacebar operation. It also insures
that there wi II be a maximum transfer of motion fr~m
the spacebar operational latch to the trigger lever as-
sembly, thereby placing a sufficient amount of wear
potential into the system (which is felt as trigger over-
throw) •
/
/'
FIGURE 1858. Trigger Upstop
Spacebar Guide Stud
a. Early Style -Adjust the guide stud to operate freely
in the spacebar stem throughout the fu II trave I of
the spacebar (Fig. 186).
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\ "~."
\
~ .• -
/'I •. . ··~.:l
I . - .. ' ... .'
/1·.....··:(, \
1\ ~~G~ide Stud
"-.. /'
FIGURE 186. Guide Stud (Early Style)
2-64
The guide stud is accessible if the 2 upper screws
of the keylever guard are removed and the guard
is rotated forward out of the way. The operational
keylever springs must be disconnected in order to
rotate the guard •
b. Late Style - Adjust the guide stud (Fig. 187) for-
ward or back in its elongated mounting hole so
that a clearance of 1/16" to 1/32" exists between
the bottom of the skirt on the spacebar and the
bottom of the ski rt on a depressed fourth row key-
button.
Guide Stud
FIGURE
187. Guide Stud (Late Style)
Make certain that the guide stud mounting bracket
is adiusted so that the stabilizing link on th~ bot-
tom of the spacebar stem does not bind on the
guide stud.
a. Early Style -Adjust the return spring front to rear
so that the top of the spacebar is level. The spring
should
be formed up or down so that a weight of
2-1/2 ounces wi II just fai I to trip the spacebar in-
terposer (Fig. 18'8). The medium screwdriver,
whi ch weighs 2-1/2 ounces, can be used for this
check.
_~c:,~
i/Is??r.
FIGURE 188. Spacebar Return Spring (Early Style)
b. Late Style - Position the spring in one of the
three holes in the carrier return/backspace repeat
bai I so that the spacebar interposer can be tri pped
by a 2-3/4 to 3-1/4 ounce load (Fig" 189).

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