Interposer - IBM 5475 Maintenance Manual

Front Guide Comb
Figure 2-1. Latch Key Adjustments
4. Pull out the pivot rod with pliers or use a follower rod
to push it out until the keylever is free.
5. Raise the pivot end of the keylever to be removed and
work it to the rear until it clears the upstop rod. Work
the keylever out of the keyboard.
6. Replace in the reverse order.
7. Perform checks and necessary adjustments.
Interposer
Checks
The interposer should be latched by the EDS latch spring
before the downward motion of the key lever is complete.
When the keylever hits its downstop, the interposer should
have some travel left before it bottoms on the guide comb
slot at the rear of the keyboard.
Adjustment-Latch Key
The interposer tip must clear the EDS latch spring, and must
be at least 0.005 inch above the bottom of the interposer
guide comb slot (Figure 2-2) when the keylever is fully
operated. To obtain these conditions, the keylever must be
formed. If the interposer is not traveling far enough, form
the keylever (Figure 2-3) by placing pliers across the pro-
jections provided on the keylever. Squeeze gently to obtain
the desired position of the <lobber. If the interposer is
traveling too far, form the keylever (Figure 2-4) by placing
2-2 (3/71)
Rear Interposer
Guide Comb
Restore
Bail
Latch Spring
f
0.005 Minimum Gap
Figure 2-2. Interposer to Guide Comb Clearance
pliers on one projection and a screwdriver between the
projections then spreading the projections. Hold the screw-
driver tip against the pliers and the shank against the
opposite projection applying force to spread the projections.
The theory of this adjustment is to raise or lower the
tail of the keylever, thus changing the relative position of
the <lobber. The travel of the key lever is not affected. If
the tail is raised, it will strike the upstop sooner and the
<lobber will be lower and closer to the interposer. The
opposite is true if the tail is lower; it will strike the upstop
later and the <lobber will be further from the interposer.