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Affected By
FIGURE 78.
Insufficient Rotate Arm Motion
Ratio Change
detent well within the acceptable band width provided
that all of the previous adjustments have been made cor-
rectly. If a slight difference in detenting must exist be-
tween the -3 and +5 characters it is permissible and some-
times desirable provided that the -3 detents more nega-
tive then the +5 character. In other words, it is better
to have too much rotate arm moti on than too
Ii
tt Ie. The
reason for this is to place a small amount of wear poten-
tial into the system for the areas of the differential mech-
anism where wear cannot be compensated for (positive
latches and latch bai I). Thus
1
as wear occurs in these
areas causi ng the rotate arm motion to decrease
r
the de-
tenting variation between the +5 and -3 characters wi II
also reduce.
Figure 78 Ilustrates the effects on detenting caused by
i nsuffi ci ent rotate arm moti on. NoH ce that the largest
detenting variation occurs between the +5 and -3. This
is because the +5 and -3 operate in opposite directions
and the error that appears when these two posi tions are
compared is the combined error of both positive and neg-
ative moti on.
If the rotate arm motion was excessive the detenting pat-
tern would remain the same except that each detent
would be on the opposite side of its detent notch.
NOTE:
The adjustment may be left loose during each
check until the correct positi on is obtained.
11. Final Typehead Homing - (Eccentric Stud Adiustment)
Use the following procedure to adjust the eccentric stud.
FiGURE 79.
Damper
I
Spring Stop -
Prelifflinary
Adjustment
2-23
a.
Damper spring stop - as a preliminary adjustment,
slide the damper spring stop down as low as it will
go behind the damper spring (Fig. 79).
b.
Raise the compensator roller all the way to the top
of the V-shaped wedging slot.
c.
Half-cycle an upper case -5 character and adjust
the eccentric stud (Fig. 80) in against the machine
si deframe unti I the -5 character detents .0 10" to
.020" in the negative direction from the center of
the detent notch when the head play is iightiy re-
moved in the negative direction (Fig. 81). Make
sure that the damper spring is fully collapsed against
the machine si deframe.
After the eccentric stud has been properly adjusted
the compensator roller must be reseated by raising
it to the top of the V -shaped slot an d stri ki ng a ser-
i es of -5 characters. The compensator roller shou Id
seat 1/16" down from the top of the slot. If it drops
too little or too much the rotate link should be ad-
Eccentri c Stud
(Make Adjustment Here)
FIGURE 80.
Eccentric Stud
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