IBM Selectric Reference Manual page 22

11. Selector Compensator - Adjust as follows:
a. Late Style (Fig. 11)
1 • Loosen locking set screws in the LH and RH nylon
blocks.
2.
Latch the extreme RH interposer down.
3.
Tighten the RH adjusting plug so that the end
ballwilltraptheinterposerin the latched posi-
tion when the interposer latch is manually dis-
engaged.
4.
Whi Ie holding the latch spring away from the
interposer
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back out the adjusting plug slowly
until the interposer "restores freely - then back
out
1/6
turn more (one flat on the hexagon nut
is
1/6).
Hex
FIGURE 11. Compensator Adjustment
I
Late Style
5. Repeat the same procedure on the LH side.
6. Tighten the locking screws in the nylon blocks.
b. Early Style (Fig. 12) - With the extreme RH inter-
poser latched down and held against the right side
of its guide slot
I
adjust the adjusting screw (or
slider) until the extreme RH ball is trapped between
the interposer and the adjusting screw (or sl ider).
Follow the same procedure for the left side.
Ba II Trapped Between The Interposer
And Adjusting Screw
Interposer Held Against Right
Side Of Its Guide Slot Make Adjustment Here
FI GURE 12. Compensator Adjustment
I
Early Style
12. Latch Bail Shaft - Adjust the plate that supports the right
end of the bai I shaft so that the bai I shaft is parallel to
the cycle shaft.
Thisadjustment isextremely important because the
roller~
on the latch bail MUST contact their respective selector
cams at the same point and with the same pressure in order
to insure that both cams operate the bai I together.
2-4
The bail shaft is set at the factory and should not require
a readjustment unless the plate becomes loosened or parts
replacement is necessary. This is a difficult adjustment
to make and should not be loosened unless absolutely
necessary.
The adjustment can be made if necessary by loosening
and tightening the bai I shaft plate mounting screws with
a hammer and screwdriver. The screws should be left
f~iction-tight until the correct position of the plate is
obtained in order to faci I itate the adjustment.
The bail shaft plate must be adjusted both vertically and
horizontally in order to make the rollers of the latch baH
ride their respective cams equally. Changing either the
vertical or horizontal position wi II affect the other;
therefore both adjustments must be considered together
andadjustedalternately until both are correct. If a re-
adjustment is necessary
I
the following procedure may be
used.
a. The correct vertical position is obtained by raising
or lowering the bai I shaft mounting plate unti I both
ba·il rollers have equal pressure against their re-
spective cams. Check by testing the drag on strips
of paper inserted between the rollers and the cams.
b. The front to rear position of the bai I shaft plate can
be set relative to the cycle shaft. Set the Hoover-
ometer to span the distance between the cycle
shaft and the left end of the bail shaft as illus-
trated in Fig. 13. Move the Hooverometer to the
right and adjust the bai I shaft plate forward or back
to the same clearance as at the left side. With
the bail shaft parallel to the cycle shaft
I
the bai I
rollers should be contacting their respective cams
at the same point.
IQ)
\
/
FIGURE 13. Latch Bail Shaft Plate Adjustment
NOTE: As a final check for the adjustment of the latch
bai I plate
I
hand cycle the machine using a zero ti It
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zero rotate character (all latches removed from the bai I).
Both latch bai I rollers should maintain contact with their
respective cams throughout the cycle.