IBM Selectric Service Manual

INDEX SELECTION SOLENOIDS
1. Adjust the solenoid core for .020" plunger to core air gap
by holding the plunger against the guide, turn in the core
until
the plunger just begins to rise, back off the core
1/2 turn and ti ghten the lock nut (Fig. 207).
NOTE: Be sure the links are not interfering during this
ad j ustm ent •
2. Adjust the rear index selection solenoid link so the air
gap on the rear solenoid will be .120" to .130" with the
front plunger sealed (Fig. 207).
3. Adjust the front index selection solenoid link so the air
gap on the front solenoid will be .120" to .130" with
the rear plunger sealed (Fig. 207):
Link (Rear)
Guide
Lock Nut
Core
FIGURE 207. Index Solenoid Adjustments
VERTICAL
FORM CONTROL
1. First Line and Body Skip Switches - With the bead chains
in place, position both switches so that each roller is just
touching the chain and sprocket at the lowest point be-
tween two small beads (Fig. 208). Connect an ohmmeter
across the
N/O contacts and slowly rotate the platen
knob until a large chain bead operates the switch roller
lever. The N/O contact must make before .047" rise of'
the-roller and break before .047" fall as a single large
bead is moved past each switch roller (Fig. 209). The
maximum rise
of the switch roller is approximately .062"
when encountering a large bead.
Just Touching
Adjusting
Plate
FIGURE 208. First Line And Body Skip Switches
2. Chain Sprocket and Hub - With the platen assembly in
place and properly detented, .rotate the hub and chain
. sprocket on the ratchet sleeve until the switch rollers are
centered on small beads. The hub and sprocket must be
fully to the left on the ratchet sleeve with the sprocket
against the end of the sleeve before tightening the hub
setscrews.
Adjusting
Plate
FIGURE 209. First Line And Body Ship Switches
3. Idler Adjustment - Adjust larger idler so there is a little
slack in both chains. The small idler can be used for fine
adjustment.
CAUTION: bo not adjust chain~ tight.
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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