IBM Selectric Reference Manual

the ho Ie in the right si de frame. An interpose r must
be latched down whi Ie holding the cycle clutch link.
Allow the link to move forward slowly and look for
.001" - .002" clearance between the pawl and the
keeper. This must be checked on both sides of the
keyboard and must be the same across the keyboard.
NOTE: If this adjustment is changed, the pawl bite
must be checked.
Pawl bite should not exceed 1/2 the thickness of the
keeper. Adjust the cyc Ie bai I upstop. This wi II main-
tain a clearance of .010" - .020" between the cycle
bai I and the interposers. With this clearance the
cyc Ie bai I wi II not be ab Ie to bounce on. the i nter-
posers.
Figure 12.0
A spring, PN 1090343, may be added between the
cycle clutch trip bai I and the cycle clutch pawl to
reduce bai I bounce (Fig. 12. 1) .
Interposer latch springs:
a . Must not be bent or ma Iformed .
b. Must overlap tne interposer by a minimum of
.050" when the interposer is latched down.
SELECTION SYSTEM CHECK FOR MAL-SELECTION
13.0 Selection System Check for Mal-Selection
*13.1 INTERPOSER TO FILTER SHAFT CLEARANCE
The
vertical clearance should be .025" - .030" when
the interposer is un latched.
*13.2 SELECTOR LATCH INTERPOSER TO SELECTOR BAIL
CLEARANCE
Form
the interposer stops to obtain .001" clearance.
If this adjustment is made, the latch links MUST be
readjusted.
ADJUST AS FO LLOWS:
The selection latches should hang vertically with
maximum overlap on the bail plate. The iinks should
5·18
have only .001" - .002" lost motion in them and
must not restri ct the overhang of the latches.
* Mechanica I Keyboard On Iy.
13.3 SELECTION LATCHES
All latch springs must be secure. Check the latch
extension to pusher clearance. This should be .035"
for a II latch pushers except the check latch whi ch is
.020" - .025".
There have been instances where the Check Latch
wi
II jump on top of the positive bai I causing sustained
mal-selection. No latches can be operated since the
check latch is holding the bai I down. This condition
can also occur if the Selection Bail Downstop is mal-
adjusted. With the machine latched at half-cyc Ie
there should be .001" - .010" clearance between the
bai I and the downstop. The vertical clearance be-
tween the check latch and the bai t shou id be increased
to .020" - .025" if this occurs.
13.4 SELECTOR LATCH EXTENSIONS
Mal-selection can be caused by loose or broken Se-
lector Latch Extensi ons {sometimes referred to as
Black Latch Extensions}.
Improper heati rig duri ng the manufacturi ng process
created bending stresses on the corners of the square
hole in the extension.
All new production machines incorporate a new Se-
lector Latch Extension which has a larger structural
surface and a rounded corner ho Ie to prevent breakage,
and insure positive positioning of the extension.
The new extensions may be recognized by thei r larger
size {see illustration}.
D
o
Early Style
Late Style
Figure 13.0

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