IBM Selectric Reference Manual

3.
4.
5.
6.
_--+---/!~-,- Ratchet Brake Spring
Reverse Interposer
to .015"
........ Feed Pawl
FIGURE 266. Ribbon Feed Plate Adjustment
The ratchets should be checked alternately with the
cartridge removed. The check as described is merely a
method of testing for the correct braking action of the
springs and has little to do with the reversing action.
Ribbon Feed Plate - With the ribbon mechanism set for
a
reversing operation and the ribbon cam at its high
point r adjust the ribbon feed plate forward or back so
that the ribbon feed pawl holds the reverse interposer
within .001" to .015" of its total travel (Fig. 266).
The adjustment not only insures sufficient throw for a
• reversing operation r but also gives optimum ribbon feed
results by determining the rest and active positions for
the pawl.
CAUTION: After completing the adjustment r manually
cycle a character to check that two teeth feed is ob-
tained plus .005" to .020" overthrow.
Be sure that the feed pawl does not contact the inter-
poser lever as the pawl is manually reversed from side
to side.
Cartridge Guides - Form the ribbon feed plate lug that
gui des the cartri dge into positi on so that the ri bbon
spools
are centered in the holes of the cartridge and
there is .001" to .010" lateral movement of the cart-
ridge.
Ribbon Lift Guide Plate - Adjust the plate as low as
possible without causing a change in the ribbon lift
guide height as the ribbon lift lever is moved from the
low lift to the high lift position (Fig. 267). The ribbon
lift cam should be at the low point when the check is
made.
The adjustment insures the same relcltive throw for both
the high and low lift positions.
Ribbon Lift Control Link - Adjust the link forward or
back by means of 'the clevis so that the underscore will
2-89
7.
8.
1.
-- ---"7
/"J
Move Link Front To Rear
FIGURE 267. Ribbon Lift Guide Plate Adjustment
strike the ribbon 1/16" from the bottom edge. The rib-
bon lift lever must be in the high lift position when the
check is made.
CAUTION: Do not adjust the link so short that it
chokes off in the front end of the cam follower s lot as
the ribbon lift lever is moved into the high lift position.
Ribbon lift Lock - Adjust the ribbon lift lock so that it
will positively hold the ribbon lift guide in the load
position. The lock is located under the right front
corner of the carrier.
Stenci I Lockout (Fig. 268) - With the lift lever in
stenci I positi on and the cam follower on the high point
of the ribbon feed cam, form the ribbon feed latch for
.010" clearance with the lug on the cam follower.
FIGURE 268. Stencil Locking
RIBBON SHIFT MECHANISM
Magnet Adjustments (2 Magnet)
a. With the armatures energized, position the hinge
plates so that the armatures clear the magnet yokes
by .003" to .005" (Fig. 269).
Black Shift Armature
(Energ i zed)
Hinge Plate
FIGURE 269. Hinge Plates
.003
11
to
.005"
Red Shift Magnet
Screws

IBM Selectric Specifications

General

Type	Electric typewriter
Introduced	1961
Keyboard Layout	QWERTY
Carriage Return	Electric
Manufacturer	IBM
Printing Technology	Typeball (golf ball)
Power Source	AC Power
Power Supply	120V AC