IBM Selectric Reference Manual

3. Tab Lever Stop (Fig. 230) - Form the stop on the es-
capement bracket. to obtain .001" - .006" clearance
between the vertical lug on the tab lever and the back-
space pawl when the tab lever is at rest and the back-
space pawl is fully seated in its rack.
On printers without backspace, adjust for .001" to
.007" between vertical lug on the tClb lever and the
escapement pawl.
Escapement Bracket-
1-,~;l~--7 ."..~~
Tab Lever LJI}:;lt~ ~~ G'f; /.
~
~~-~--- / (
~~ ~ ~
'" I \ -~ /~~
~,W ~/\ Stop Esc~~:ment Rack
/~~Ul( il' J) -. ~ Tab Le~er
fVSackspace Rack /
Form This
Lug I Tab Lever :$::1 I' .00] II
~B~c~p~c=- ~~--~~ __ / .J03
11
4.
5.
6.
FIGURE 230. Tab Lever Stop
Escapement Torque Bar Stop - Observe an .008" - .010"
cl earance between the escapement torque bar and the
lug of the escapement pawl (Fig. ]46). Check the pawl
mounting stud for .001" clearance between it and the
escapement torque bar (Fig. 148). This adjustment
should be checked at the left and right sides of the
printer. On 15" printers, final adjustment should be
made with a pawl mounting stud directly opposite the
escapement torque bar back-up (Fig. 149).
Tab lever Pawl (Fig. 231) - Adjust the pawl forward or
back on the tab lever so that the tip of the pawl clears
a set tab stop by .035" to .050". This adjustment
should be checked on the left, center, and right of
carrier travel.
Tab Rack
~
--.-----
Tab Lever . ....
~ - ~---:O3511 to .050
11
CS;~~ Adjust Tab Lever
_J
U
'-'
~ Pawl
fiGURE 231. Tab Lever Pawl
Tab Rack (Fig. 232) - With the tab cam on" its high
point I adjust the tab rack left to right for .005 II -
.020
1i
clearance between a set tab stop and the side
of the tab lever pawl.
2-77
7.
8.
Tab Pawl
FIGURE 232. Tab Rack Bushing
Pawl Clearance (Fig. 233) - The upright lug of the tab
latch should be formed forward or back so that the tip
of the escapement pawl clears the escapement rack
teeth by .005" - .015" when the tab lever is latched
to the rear.
Sma II Screwdriver
Escapement Bracket
Escapement Rack
.005 II to .015 II
FIGURE 233. Pawl Clearance Adjustment
Carrier Return Tab Interlock (Fig. 234) - With the car-
rier return clutch ·Iatch (in a carrier return operation)
the upright lug of the tab latch should clear the end of
the tab lever pawl by .005" - .025 ". The rear lug of
the tab latch should be formed forward or back to ob-
tain this condition.
NO TE: After this adjustment is made, the carrier re-
turn mechanism should be unlatched and a tab lever
latched out. The rear lug on the tab latch should
again be checked to ensure that it is not touching the
escapement torque bar.
JS
.005
11
to
~ '- .025
11
~~)
-, ~
- Escapement
Torque Bar
Form Rear
Lug Of Latch ---+-;......++~~~~\
For Clearance
FIGURE 234. Interlock

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