Covers And Mounts - IBM Selectric Manual

COVERS AND MOUNTS
1. TOP COVER HINGE - The hinge should be adjusted so that the con-
tour of the top cover matches the <ontour of the center cover (Fig.
208).
HINGE
FIGURE 208.
MAKE THE ADJUSTMENT
ATTHESE POINTS
ADJUST AT 4 POINTS
TOP COVER HINGE ADJUSTMENT
2. TOP COVER LATCHES - Adjust the latches front to rear so that the
top cover is latched securely in the closed position.
3. HINGE SPRING - The spring should be positioned front to rear so that
the top cover hinge is detented and held in the open position.
4. CENTER COVER MOUNTS - Adjust the center cover mounts so that
with the machine suspended in the covers the following four require-
ments are met:
a. All of the openings for keybuttons will have equal clearance on
each side.
b. The platen will clear the covers in the extreme front or rear po·
sition.
c. The clearance between the paper guide and the d.flector will
be
.020" to .040" (fig. 209).
d. The top of the spacebar will be 1-3/8" above
t~fI
bottom of the
center cover section.
The shock mount brackets ore adjustable front to rear as well as up
and down. The cover brackets are adjustable left and right on the
shock mounts.
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!
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1
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FIGURE 209.
DEFLECTOR PAPER GUIDE CLEARANCE
5. TOP COVER INTERLOCK - The top cover interlock lever should be
formed so that when the top cover is closed the following conditions
exist:
a. The top cover hinge contacts the interlock squarely in the center.
b. A clearance of 1/16" to 3/32" exists between the lower lug of
the cover interlock and the carrier return/tab interloc:k lever
(Fig. 210).
FIGURE 210. TOP COVER INTERLOCK
FABRIC RIBBON MECHANISM (NEW STYLE)
1. CARTRIDGE GUIDE LUGS: Form the cartridge guide lugs so that
the cartridge spools will be centered over the ratchets. Side play
of the cartridge must be limited within .005"·.010".
73
2. CARTRIDGE RETAINING SPRINGS: The cartridge retaining springs
should be positioned laterally so they are FLUSH against the feed
plate; then adjusted front to rear so that the cartridge retaining fing-
ers are centered in the holes of the cartridge guide lugs. (Fig. 211).
The ratchet brake portion of the spring should exert a small drag on
the feed ratchet. Form only as necessary.
NOTE: Excessive or insufficient tension could result in reverse fail-
ure.
RETAINER
FINGER
CENTERED
CARTRIDGE RETAINER
MOUNTED FlUSH
~
FIGURE 211. CARRIAGE RETAINING SPRINGS
3. RIBBON LIFT LEVER: Three conditions must be met as follows:
a. Form the lift lever finger tab left or right (Fig. 212A), so that
the ribbon feed pawl will center between the two feed ratchets
when the lift lever is placed in stencil position.
b. Form the rear lug so that a clearance of .010"-.040" exists be-
tween the lug and the feed plate positioning lug when the LEFT
HAND RATCHET IS FEEDING (Fig. 212B).