IBM Selectric Service Manual

The Customer Engineer wi II usually make his adjust-
ment, tighten the lock nut, and find his adjustment
has changed several days later. This is due to the
limited engagement of the nut on the clevis. When-
ever you are making this adjustment I check the clevis
to be sure there is no burr on the bottom and if there
is, remove the c levis and file the burr away.
This burr cannot be removed due to manufacturing
tolerances. A new design is anticipated very shortly.
Burr
Figure 8.3
8.4
9.0
9.1
9.2
9.3
S.H. THREADING OF ARMATURE BY INTERPOSER
LINKS
Repeat cycles or failure ta release an interposer may
be caused by the threaded portion of the link biting
into the armature, causing an improper'link adjust-
ment.
OPERATIONAL AREA
Operational Notes
REPEAT FUNCTIONS
There are no repeat functi ons on the I/O Pri nter ,
consequently the Operational Keylev~r Pawls require
on Iy the bottom lug. The top lug (Repeat Lug) shou Id
be broken off.
NYLON CORD DRUM
If the slot in the Nylon Cord Drum opens or breaks, a
new
slot may be made with a spring hook which has
been heated.
INTERPOSER HEIGHT
The operational interposer height may be adjusted by
using the following procedure:
a. Hold the Clutch Release Arm so thaUhe cam re-
peats.
b. Turn the Interposer adjusting screw clockwise,
until the mechanism begins to operate (carrier
begins to move).
9.4
9.5
4-13
c. Back the adjusting screw out unti I the mechanism
stops operating, then back it out an additional
1/2 turn.
S.H. EXCESSIVE UP AND DOWN PLAY AT THE LH
END OF THE OPERATIONAL SHAFT
Excessive up and down play at the LH end of the op-
erational shaft requires the replacement of the black
nylon sleeve in the torque limiter hub and the cycle
clutch pulley hub.
S.H. OPERATIONAL SHAFT REMOVAL
1. Remove shift clutch ratchet and clutch spring.
Do not disturb the clutch arbor.
2. Loosen set screws in: Torque limiter hub, tab
governor hub, tab governor collar, operati ona I
cam ratchet (and R. H. shaft collar if long car-
riage) .
3. Remove clip from C.R. pinion spring.
4. Push torque limiter hub to the left as far as poss-
ible; then spread the coils on the CR pinion
spring and, with the pusher end of a springhook
push
the left hand pinion retainer off the shaft.
5. Move the pinion gear to the left and remove the
retainer clip at the right side.
6. The operational shaft may now be pulled out
through the shaft bearing toward the right. Any
part mounted on the shaft or around it may be
easi Iy removed or replaced.
Since the shift clutch arbor has not been loosened
from the shaft, upon reinstallation the shaft need only
be pushed inward unti I the shift clutch arbor bears
against the shift bearing (.002" - .004" end play) to
insure
placing the carrier return pinion gear back into
the same position as before disassembly. None of the
shift mechanism has been removed; therefore, no shift
adjustments
need be remade or checked.
In order to reset the operational cams in their original
position use the "tracks" on the cam follower rollers
as a guide. With ratchets which have only the set
screw, be certain the screw is tightened to the flat
side on the operational shaft.
Reset the tab governor hub and collar, observing the,
proper mesh and end play adjustments.
After re-installation of the C-clip retainers on either
side of the carrier return pinion gear, move the tor-
que limiter hub to the right as far as possible. Then
spread
the torque limiter spring loops and insert a
.005" feeler gage blade between the torque limiter
hub
and the torque limiter arbor. Tighten the torque
limiter hub, then remove the gage.
Install the clip which fastens the CR pinion spring to
the,torque limiter arbor.

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