IBM Selectric Service Manual

C-5 N/C
MACHINE
BREAK MAKE
1447
15 ± 10 105±5
1052
15 ± 10 105 ±5
T053
15 ± 10 105 ±5
1062
15 ±10 105 ±5
Figure 135. Timing Chart
NOTE: Trip the Tab Interposer, turn the operational shaft
unti I the cam just starts to turn. This is zero degrees.
SPACEBAR MECHANISM
1. All print escapement and operational control adjustments
must be correct before attempting adjust~lents of the
spacebar.
2. Spacebar Latch Lever Screw - Adjust the screw so that
.007" to .010" clearance exists between the escapement
trigger and the escapement torque bar (Fig. 136A). Dis-
connect the escapement trip link before making this ad-
justment.
~ ___ Trigger
Torque Ba
FIGURE 136A. Spacebar Latch Lever Screw
(Long
Carriage)
The trigger upstop should be moved up out of the way
when making this adjustment. After completing the ad-
justment the upstop should be adjusted so that it clears
the trigger lever by .001" to .005" (Fig.136B).
This adjustrnent insures that the trigger wi II properly re-
set over the lug on the escapement torque bar at the com-
pletion of each spacebar operation. It also insures that
there will be a maximum transfer of motion from the
spacebar operati onal latch to the trigger lever assembly,
thereby placing a sufficient amount of wear potential
into the system (which is felt as trigger overthrow).
Trigger Upstop
/
/
I
\
'\.
'-...
/
../
FIGURE 136B. Trigger Upstop
BACKSPACE MECHANISM
I. Be sure the print escapement and operational control ad-
justments are correct before attempting backspace ad-
justments.
2. Tab Lever Stop - The rest position of the tab lever is
controlled by a lug on the escapement bracket called
the tab lever stop (Fig. 137). The stop should be formed
front or rear so that a clearance of .001 II to .003" exists
between the verti cal lug on the tab lever and the back-
space pawl when the backspace pawl is bottomed in its
rack.
-----
/
I
"".---.,
,
//
--
Tab Lever Stop
Tab Lever ~ '"*.....,.~.001" to .003"
Backspace Pawl ',- ____
FIGURE 137. Tab Lever Stop Adjustment
The tab lever stop may be formed by inserting the T-
bender from the upper right side. It wi II be necessary to
force the tab torque bar to the rear in order to insert the
T -bender.
2-41

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