IBM Selectric Maintenance Manual page 23

3. Armature Stop - With the armature manually attracted,
adjust for a clearance of .004" to .008" between the
armatures and yokes (Fig. 12 - see Fig. 11 for assembly
end view) • Measure clearances at the outside arma-
tures (T2 & R5).
Armature
Mtg. Bracket
'-..c,r-= _ _ _
~~
Gu;d,
Armature Stop Stop Screw
FIGURE 11. Armature Stop
4. Armature Guide - Position horizontally so that the arm-
atures are centered in the guide slotS (Fig. 11).
.004" to .008"
Armature
Armature Stop
FIGURE 12. Armature Stop
5. Back Stop (Fig. 13) - Position vertically (with arma-
tures at rest) for a clearance of .041" to .044" between
the armature stop and armatures. Measure clearance at
the outside armatures (T2
&
R5).
Armature
I~"'
_ _
Mtg. Screw
.041" -
Armature Stop
FIGURE 13. Armature Backstop
6. Pivot Eccentrics (Fig. 14)- Adjust so that the cycle
clutch trip bail is parallel to the armatures. The follow-
ing procedure may be used:
a. Disconnect the trip link (Fig. 18).
b. Apply slight pressure to the knockoff extension (Fig.
17)or trip link extension to hold the bail in contact
with the armatures.
c. Apply slight pressure to the T2 and R5 armatures (Fig.
10). Both armatures should be touching the trip bail.
If not, adjust the pivot eccentrics to satisfy this con-
dition.
2-4
Arm
581~~~~~fr"'''''''~---
Just Touches
FIGURE 14. Pivot Eccentrics
NOTE: The high point of the pivot eccentrics must be
toward the top (paper feed area) of the machine
~
the
pivot eccentrics are. not positioned to the top, the print
magnet armatures will contact the trip bail too soon,
causing sluggish operation or failure to trip the cycle
clutch.
d. After completing step c, while holding the trip bail
against the armatures, check the center. armatures
tr
be sure they are touching the trip ban or clear it b},
a maximum of .002". ExcessiveVclearance can cause
extra cycles.
NOTE:
Item 6 isa preliminary adjustment. For final adjustment,
see note
unde~
Item 3 of cycle clutch trip mechanism.
7.
Magnet Unit (Fig. 15) - Position under its two mounting (
screws for .005" to .010" clearance between the pusher·
tai Is and armature latching surfaces (armatures at rest).
This adjustment insures that the pusher does not contact
its latch extension when the pusher is against its armatur'.
during a print cycle. If allowed to touch mal-selection
wi
II
resu It.
Pusher Tail -Ij-J05" - .010"
Latching
surface~.
II
Armature •
'-
.
. Power Frame
FIGURE
15~
Magnet Unit Position
8. Mounting Bracket (Fig. 16).- Position under its fou'
mounting screws for .001" to .010" clearance between
the pusher tai Is and armatures.
NOTE:
Adjustments 7 & 8 are interacting - both requirements
must be satisfied.
Excessive clearance may cause mal-selection since the
armature may not hold the pusher tai I when the magnet
is not energized.