IBM Selectric Reference Manual

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Copy Control Lever
Copy Control Ecc.
FIGURE 133. Copy Control Mechanism
PRINT MECHANISM - EARLY STYLE
Copy Control Lever - With the copy control lever de-
tented in the forward position, the high points of the
eccentrics should be vertical {Fig. 133). Adjustthecopy
control lever on the shaft to satisfy this condition.
This adjustment provides the most effective operation of
the eccentrics in moving the platen forward and back.
NOTE: The stop ears on the copy control detent spring
should be formed to provide positive detenting in the
extreme front and rear positions of the lever.
CAUTION: The adjustment of the copy control lever,
while important as a preliminary setting, should not re-
quire adjustment unless it becomes loose or parts replace-
ment is necessary. Any change in the adjustment will
affect the front to rear position of the platen requiring
that other adjustments be altered to compensate.
The copy control lever should be all the way forward
unless stated otherwise for the following adjustments.
Eccentric Retaining Plates - For maximum efficiency of
the copy control eccentrics, adjust the plate on each
side of the machine so that no front to rear play exists
between the eccentrics and the retaining plates (Fig. 133).
Be sure that no binds exist.
Platen Latches - Adjust the platen latch eccentrics{Fig.
133) with the high part down so that the platen is held
firmly in posi"tion vertically and horizontally. The
latches should latch and unlatch freely with the feed
rolls released.
Platen Position - To properlyadjustthe print mechanism,
the correct position of the platen must be established first
and then the print ad justments made relative to the platen
2-42
position. This involves both a height adjustment and a
front
to rear position. Because of the method used in
measuring these positions, it is necessary to consider them
together and ad just them alternately unti I both are correct.
a. Platen Height - With the head of the Hooverometer
setatthe #4scribe line, the platen should just touch
the base of the handle when the head is resting on
the escapement rack ( Fig. 134).
#4 Scribe
Platen Center Line
»<::~
Line i:":
FI GURE 134. Platen Height Adjustment
Ad just the platen guide bracket eccentri cs to obtain
this condition (Fig. 133). The high part of the eccen-
tri cs shou I d be kept to the rear. It is necessary to
remove the deflector end front feed rolls when check-
ing the adjustment with the Hooverometer.
NOTE: The Hooverometer should be inserted at a
position just to the left of the escapement cord drum
when checking the right side and directly in line

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