Selection System Check Formal-Selection - IBM Selectric Maintenance Manual

the hole in the right side frame. An interposer must
be latched down whi Ie ho Iding the cyc Ie clutch link.
Allow the link to move forward s lowly 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 cycle bail upstop. This will main-
tain a clearance of
.010" - .020"
between the cycle
bail 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 spri ng, PN
1090343
I
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 the 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 BAI L
CLEARANCE
Form the interposer stops to obtain
.001"
clearance.
If this adjustment is made, the latch links MUST be
readjusted.
ADJUST AS FOLLOWS:
The selection latches should hang vertically with
maximum overlap on the bai I plate. The links shou Id
4-18
have only
.001" - .002"
lost motion in them and
must not restri ct the overhang af the latches.
*
Mechanical Keyboard Only.
13.3 SELECTION LATCHES
All latch spri ngs must be secure. Check the latch
extension to pusher clearance. This should be
.035"
for all latch pushers except the check latch which is
.020" - .025".
There have been instances where the Check Latch
wi II jump on top of the positive bai I causing sustained
ma I-se lection. No latches can be operated since the
check latch is ho Idi ng the bai I down. This conditi on
can also occur if the Selection Bail Downstop is mal-
. adjusted. With the machine latched at half-cycle
there should be
.001" - .010"
clearance between the
bai I and the downstop. The vertica I clearance be-
tween the check latch and the bai I shou Id be increased
to
.020" - .025"
if this occurs.
13.4 SELECTOR LATCH EXTENSIONS
Ma I-se lection can be caused by loose or broken Se-
lector Latch Extensions (sometimes referred to as
Black Latch Extensions).
Improper heating during the manufacturing 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 hole to prevent breakage,
and insure positive positioning of the extension.
The new extensions may be recognized by their larger
size (see illustration).
D
o
Early Style Late Style
Figure
13.0