IBM Selectric Manual

2. Ratchet Brake Spring - Form the left and right ratchet
brake springs so that each will hold its ratchet in posi-
tion after the ratchet has been manually rotated far enough
to full y actuate the reverse mechanism.
The ratchets should be checked alternatel y with the cart-
ridge 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.
3. Ribbon Feed Plate - With the ribbon mechanism set for
a reversi ng
operation and the ribbon cam at its high point,
ad just the ribbon feed plate forward or back so that the
ribbon feed pawl holds the reverse interposer within. 005
"
to .010" of its total travel (Fig. 186).
4.
FIGURE 186. Ribbon Feed Plate Adjustment
The adjustment not only insures sufficient throw for a re-
versing operation, but also gives optimum ribbon feed
results by determining the rest and active positions for
the pawl.
CAUTION: Aftercompletingthe adjustment', 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
guides the cartridge into position so that the ribbon
spools are centered in the holes of the cartridge and
there is .005" to .010" lateral movement of the cart-
ridge.
5. Ribbon lift Guide Plate - Adjust the plate as low as
possible without causinga change in the ribbon lift guide
heightas the ribbon lift lever is moved from the low lift
to the high lift position (Fig. 187). The ribbon lift cam
should be at the low point when the check is made.
63
Adjust Plate
Up Or Down
Move Link Front
To Rear
FIGURE 187. Ribbon Lift Guide Plate Adjustment
The adjustment insures the same relative throw for both
the high and low lift positions.
6.
Ribbon Lift Control Link -Adjust the link forward or back
by means of the clevis so that the underscore will strike
the ribbon 1/16" from the bottom edge. The ribbon lift
lever must be in the high lift position when the check
is made.
CAUTION: Do not ad just the link so short that it chokes-
off in the front end of the cam follower slot as the rib-
bon lift lever is moved into the high lift position.
7. 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.
8.
o
FIGURE 188. Stencil Locking
Stencil Lockout {Fig. 188) -Withtheliftleverinstencil
position 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.

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