IBM Selectric Maintenance Manual page 63

2. Carrier Return and Space Bar Magnet Pivot Plate (Fig.
123) - Position as follows:
a. Vertically - so that the left and right armatures
clear their yokes by
.001"
to
.003".
b. Horizontally - so that the armatures center in their
guide slots.
Adjustments 1 and 2 provide free operati on of the armatures
and prevent binding or choke-off.
Armature
Pivot Plate
FIGURE
123.
Pivot Plate
3.
Armature Backstop (Fig.
124) -
Position (armatures at
rest) so that the armatures clear their yokes by .020" to
.025".
This adjustment provides sufficient motion to unlatch the
interposers and also insures the armatures will be at-
tracted by the magnet coils when they are energized.
Armature
FIGURE
124.
Armature Backstop
Operational Interposer
Center line For Interposer
And Armature
FIGURE 125. Left to Right
2-39
4.
Magnet Unit Position - Position as follows:
a. Left to Right - so that the armatures are directly
beneath their corresponding interposers (Fig.
125).
b. Front to Rear - so that the armature link holes are
slightly to the rear of the interposer link holes (Fig.
126).
Having the trip link offset insures unlatching of the
interposer since the link pulls downward and also
to the rear.
FIGURE
126.
Front to Rear
5.
Pull Link (Fig.
127) -
Adjust the operational pull links
so that a .002" to .010" clearance exists between the
interposer latch bracket and the interposer latch at the
point of relatching.
NOTE: Test this adjustment by manually attracting the
armature and turning the operational shaft so that the in-
terposer is being restored toward the front.
.002"
to .010"
Clearance
Operational Armature
Manually Attracted
FIGURE 127. Check, Trip link
Operational
Magnet
With all parts at rest (Fig.
128)
be sure a clearance exists
between the pu II link and the armature.
The pull link must be approximately 1/2 turn too long to
insure that the armature is moving prior to picking upthe
load of the interposer. A trip link adjusted too short can
cause an intermittent operation 'or complete fai lure to re-
lease.