IBM Selectric Reference Manual

2 .. ~ Armature Backstop (Late Style) (Fig. 173.2) -
Position, vertica Ily, so that the armatures (at rest) clear
their yokes by .020
11
to .025
11
•
Armature Backstop
FIGURE 173.2 Armature Backstop
3. Magnet Un it Position - Position as follows:
a. Left to Right - so that the armatures are directly
beneath the ir correspond ing interposers (Fig. 173.3).
Armature
FIGURE 173.3 Left To Right
b. Front to Rear - so that the armatUJe I ink holes are
sl ightly to the rear of the interposer I ink holes (Fig.
173.4) .
Link Off-Set
Shock Absorber Armature
Having the trip I ink offset insures unlatch ing of the
interpose-r since the I ink pulls downward and also to
the rear.
4. Pull Link (Fig. 173.5) - Adjust the operational pull links
so
that a .002" to .010
11
clearance exists between the
interposer latch bracket and the interposer latch at the
point of relatching.
.002" to .010" Clearance
Operational Armature,
Manually Attracted
FIGURE 173.5. Check, Trip Lihk
NOTE: Test this adjustment by manually attracting the
armature and turning the operational shaft so that the in-
terposer is being restored toward the front.
With all parts at rest.{Fig. 173.6) be sure a clearance ex-
ists between the pull I ink and the armature.
The pull link must be approximately 1/2 turn too long to
insure that the armature is moving prior to picking up the
load of the interposer. A trip I ink adjusted too short can
cause an intermittent operation or complete failure to re-
lease.
Interposer Latch Bracket
~Wdt"--
Clearance
Operational Armature
(De-Energized)
Interposer Latch Position
Operational Magnet
FIGURE 173.4. Front to Rear FIGURE 173.6. Trip Link
2-60

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