IBM Selectric Reference Manual

TAPES
16 .0 Broken Tapes
When a
tape breaks, the cause should be isolated to
prevent a reoccurrence. The following list outlines
the causes of tape breakage.
16.1 ROTATE TAPE
a. Rotate detent clearance, (Is the Detent Actuat-
ing Lever Roller in place?)
b. Print shaft timing.
c. Shift Interlock adjustments.
d. Shift Arm moving out in straight line.
e. Defective Rotate Arm or Shift Arm Pulley.
f. Any bind that affects free rotation of the head.
g. Loose or missing Tape Guide.
h. Burrs on any area where the tape trave Is.
i. Negative latch clearance is insufficient.
j . Latch links adjusted too long.
k. Latches slip from under the bai I duri ng operati on
(links too short).
I. Foreign material obstructing the travel of the
tape.
m. Interference between the Ti It and Rotate Pulleys.
n. See 10.23.
16.2 TILT TAPE
a. Detent to Ti It Ring clearance.
b. Burrs on the Ti It Pu lIey (especia lIy where the
tape comes out of the pu Iley .)
c. Any bi nd that affects free moti on of the Ti It
Ring.
d. Foreign material in the sector gears.
e. Print shaft timing (affects the rotate mechanism
more) .
f. Ti It Pulley Spring missing or broken. (Spring
eye must face the rear of the machine.)
g . Interference between Ti It and Rotate Pu Ileys .
h. Excessive wear in the R. H. Ti It Pulley Stud.
Most common causes.
16.3 S.H. TAPE BREAKAGE OR MAL-SELECTION
A curled end or a ragged leading edge on a rotate or
ti It tape wi II indicate one of the following:
1. Shift arm not parallel 'to the carrier.
2. Rotate or tilt arm not parallel to the carrier.
Shou Id it be necessary to move the rotate and ti It
arm (using their mounting bracket) further to the rear
of the machine, it may be necessary to file a small
amount of material from the power frame edge in the
area of the ti It tape, in order to ensure no interfer-
ence. Shou Id it be necessary to move the arms to-
ward the front, check for interference with the follow-
ing:
1. The rotate eccentric stud on the paper bai I
spring.
2. The rotate arm itself on the damper spring stop.
5-24
3. The ti It tape rubbing across the head of the car-
rier shoe eccentric stud when the carrier is at the
extreme left hand.
16.4 SPRING LOADED TILT ARM
All current production Selectric I/O Printers wi II
have a spring loaded, left-hand ti It arm. This feat-
ure prevents accidental disengagement of the ti It tape
from its pulleys whenever slack is introduced into the
system. For example, if the operator should manu-
ally tilt the typehead during removal or installation
of the head, the spring loaded arm will automatically
maintain the tape's position on its pu lIeys.
A simi lar spring is used on the shift arm to protect the
Rotate Spring.
16.5 S.H. ROTATE TAPE
The Rotate Tape should twist "top to the front" as it
leaves the left side of the Carrier.
16.6 S.H. TAPE INSTALLATION
When installing the new style (crimped) tapes, it may
be di ffi cu It to insert the liT II end throug h the rear of
the Rocker . To faci Ii tate i nsta lIati on, the tape
shou Id be inserted eye let fi rst throug h the front of the
Carrier, and pulled through until the "T" can easily
be inserted.
16.7 S . H . TAPE WI PER
The Tape Wiper on the left side of the Carrier must
be removed. It causes flexing of the tapes which can
result in mal-selection and eventually tape breakage.
16.8 S.H. OLD LEVEL TILT
When installing a Rotate Tape it is necessary to re-
move the Ti It Pu lIey Spri ng. The Ti It Tape slackens
and usua lIy fa lis off the pu lIey. This can be prevented
by p laci ng a rubber band around the Ti It Tape near
its anchor pin on the right side of the Carrier, and
then hooking the rubber band to the right hand Mar-
gin Stop. This wi II hold tension on the Ti It Tape to
keep it on the pu lIey, and wi II a Iso ho Id the tape on
the anchor pi n c lear of the path for the new Rotate
Tape.
16.9 GEARLESS TILT PULLEY/BELLCRANK
An improved ti It pu lIey and be IIcrank has entered
production. This pulley/bellcrank will provide a
more
reliable ti It operation and wi II eliminate acci-
denta I disengag i ng of the tape at the p~ lIey anchor
and will also eliminate breakage of the tilt tape due
to flexing at the tape anchor point.
This new design tilt pulley/bellcrank, B/M 1280498,
is avai lable for field replacement. In order to pre-
clude a third level of tapes, all former gearless ti It
tapes and ti It pu Ileys have been made obso lete. When
replacement parts are necessary, a complete conver-

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