IBM Selectric Service Manual

Breck In Wiring
Diode Open
Interlock Open
Defective Driver
Or Reed Relay
OPERATIONAL AREA IN OUTPUT MODE
No
Yes
~ __________ ~N~o __________ ~ Y~
No Y~
Armature Link Adjustment B.l, B.3, B.4
Refer To Section:
Backspace 1.0
Spacebar 2.0
Tab 5.0
Carrier Return 6.0
Figure 8.0
8.0
8.1
8.2
OPERATIONAL AREA IN OUTPUT MODE
Operational Adjustments
Adjust
the Armature Link so that the interposer
clears the latch bracket by .005" - .010" with the
magnet energized.
REPEAT CYCLES MAY BE CAUSED BY:
a. The armature sea ling to the core. Adjust the
armature pivot plate for .002" - .005" armature
to yoke clearance. It is desirable to maintain
the adjustment close to the high limit to insure
that the armature does not contact the core.
b. I nsuffi ci ent interposer restori ng acti on (2. 16)
c. I nterposer latch bi ndi ng or spri ng off.
d. Release lever slips off cam wheel.
The cam wheel mounting stud has been extended so as
to
provide greater release lever bite on the cam wheel.
The improved bite will eliminate extra cycles of the'
Operational cams caused by the release lever slipping
off
the si de of the clutch whee I.
Armature
.002" - .005"
\
Armature Pivot Plate
Figure 8.1
8.3
Part No.
1159268
1159267
1159269
Description
CR cam
SB cam
Ratchet
OPERATIONAL INTERPOSER LINKS
The i lIustrati on be low shows the operati ona I i nter-
poser clevis and armature link. Each time one of the
operational magnets is energized, the armature pulls
on this
link, which in turn pulls the interposer from
its rest
position and activates it. Each one of these
Ii nks must be adjusted for proper un latchi ng c lear-
ance. A prob lem has been encountered where the
lock nut, when tightened against the clevis, tends to
loosen very rapid Iy due to a burr on the bottom of the
clevis. The illustration shows this burr and how the
locI<! nut contacts it, giving it a very small locking
surface.
Backstop
Mtg.
Armature Backstop
Figure
8.2
4-12

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