IBM Selectric Reference Manual

sion to the current level will be required. Time and
parts for this conversion may be charged to Code 32.
B/M 1280498 includes the following parts:
Ref. Part No. Description
-
1 1164310
Pu Iley, Ti It
2
1128455
Stud, Tilt Pulley(redes.igned)
3
1164099
Washer, Fe It
4 1164158 Washer, Spacer
When orderi ng the above bi II of materi a I, it wi II be .
necessary to order a new ti It tape to be used in con-
junction with the above bi II. The new ti It tape part
numbers are as follows:
Figure
16.0
Ref. Part No. Description~
5
5
1164314
1164316
4 __ ........
Tape, 1111 Printers
Tape, 15
11
Printers
5
Insta Ilation: Since the new pu lIey is heavier, it may
be necessary to use two spacer washers to provide suf-
ficient clearance between the pulley and the yoke in
ti It 3 position. The mounting stud should be lubricated
with IBM #23 grease and the felt washer kept dry.
The purpose of this washer is to keep erasures out of'
the pivot bushing.
MECHANICAL KEYBOARD LOCKUP
17.0 Mechanical Keyboard Lockup
17. 1 The most common causes for Keybo4:::1rd Lockup are:
a. The Cyc Ie Clutch Latch Link Pawl doesn't clear
the keeper with an interposer latched down.
(Section 10.0).
b. Fi Iter shaft timing adjustment.
c. Cyc Ie shaft overthrow adjustment (Adjustment
4.5) .
5·25
d. Latch motion restricted by restoring roller.
(Section 15.0),
e. Cyc Ie clutch adj ustments - latch bi ndi ng (Secti on
15.0) .
f. Character interrupter adjustment. Old Style -
See Ref. Man. New Style - See 17.2:
g. The Linelock Interposer binds in the Selector
Compensator (clean and lubricate).
17.2, KEYBOARD LO CKUP
Keyboard 10ckup wi II resu It from excessive overlap
of the cyc Ie clutch pawl stop on the cyc Ie clutch
pawl. All SELECTRIC I/O Printers should be checked
using a new specification of 1/3 to 1/2 overlap of
the paw I stop on the cyc Ie clutch paw I (see i lIustra--
tion). Be sure to maintain the .010
11
to .020" verti-
cal adjustment.
Cycle Clutch Pawl
.010
11
To .020
11
Figure 17.0
TRANSMIT ERRORS
18.0 Transmit Errors
18.1 S.H. TRANSMIT CONTACTS
The transmit contacts may be dirty. Clean with IBM
contact cleaning fluid, then wipe dry with clean
bond paper.
18.2 The transmit contact air gaps should be .020".
18.3 The C 1 and C2 contacts must not bri dge (NjO and
N/C make at the same time.) For C1 and C2 timing
see the applicable systems Reference Manual.
18.4 PRI NT SE LECTIO N CO NT ACT ACTUATORS
If the contact actuators bind, they should be replaced
with the new style. The material used in manufact-
uring the contact actuators has been changed from
a
dear translucent nylon to a cloudy, yellowish,
fiber nylon. The finish of the actuator plates has
been changed from nicke I to chrome to provide more
reliable operation of the actuators. When replacing
an old style actuator with a new style actuator, the
actuator plate must ALSO be changed. Only new
style actuator plates are avai lable for field replace-
ment. All part numbers remain the same.

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