ISS 8, SECTION 574-220-700TC
1.03 The adjustments in this section are ar-
ranged in a sequence that should be fol-
lowed if a complete readjustment of the unit is
undertaken. A complete adjusting procedure
should be read before attempting to make the
adjustment. After an adjustment is completed,
be sure to tighten any nuts or screws that may
have been loosened, unless otherwise instructed.
1. 04 The adjusting illustrations indicate toler-
ances, positions of moving parts, spring
tensions, and the angle at which scales should be
applied. The tools required to make adjustments
and check spring tensions are not supplied with
the equipment, but are listed in Section
570-005-800TC. Springs which do not meet the
requirements, and for which there are no ad-
justing procedures, should be discarded and
replaced by new springs.
1.05 References made to left, right, up, down,
front, rear, etc, apply to the unit in its
normal operating position as viewed from the
front.
1.06 When a requirement calls for a clutch to
be disengaged, the clutch shoe lever must
be fully latched between its trip lever and latch-
lever so that the clutch shoes release their ten-
sion on the clutch drum. When engaged, the
clutch shoe lever is unlatched and the clutch
shoes are wedged firmly against the clutch drum.
Note: When the main shaft is rotated by hand,
the clutch does not fully disengage upon reach-
ing its stop position. In order to relieve drag
and permit the main shaft to rotate freely,
apply pressure on the lug of the clutch disc
with a screwdriver to cause it to engage its
latch lever and fully disengage the clutch.
1.07 To manually operate the typing unit
proceed as follows.
(a)
Attach the TP312709 armature clip to the
selector magnet armature by carefully
placing the spring loop over the magnet ter-
minal insulator. Press down to engage the
hook of the clip on the underside of the arma-
ture and release. The spring tension of the
armature clip will hold the selector arma-
ture in the marking (attracted) position.
(b)
While holding the selector magnet arma-
ture operated by means of the armature
clip, use the handwheel, included with the
special tools for servicing 28 teletypewriter
apparatus, to manually rotate the main shaft
in a counterclockwise direction until all the
clutches are brought to their disengaged
position.
(c)
Fully disengage all clutches in accord-
ance with 1.06, Note.
(d)
Release the selector magnet armature
momentarily to permit the selector
clutch to engage.
(e)
Rotate the main shaft slowly until all the
pushlevers have fallen to the left of their
selecting levers.
(f)
Strip the pushlevers from their selector
levers, which are spacing in the code
combination of the character function that is
being selected, and allow the pushlevers to
move to the right.
(g)
The pushlevers and the selector levers
move in succession starting with the no. 1
to the no. 7; the no. 8 is always marking and
is not equipped with a selector lever.
(h)
Continue to rotate the main shaft until all
operations initiated by the selector action
clear through the unit.
1.08 Where adjustment instructions call for
removal of components, assemblies,
subassemblies or parts, all adjustments which
the removal of these parts might facilitate should
be made before the parts are replaced or as the
equipment is reassembled. When a part mounted
on shims is removed, the number of shims and
their location should be noted so that the iden-
tical pile-up can be made when the part is re-
placed.
1.09 All electrical contact points should meet
squarely. Contacts with the same dia-
meter should not be out of alignment more than
25 percent of the contact diameter. Check con-
tacts for pitting and corrosion and clean or bur-
nish them before making specified adjustment or
tolerance measurement. Avoid sharp kinks or
bends in the contact springs.
CAUTION: KEEP ALL ELECTRICAL CON-
TACTS FREE OF OIL AND GREASE.
1. 10 When making a complete adjustment of
the unit, the following conditioning op-
erations should be performed to prevent damage.
(a) Loosen the shift lever drive arm clamp
screw (2.13).
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