IBM Selectric Maintenance Manual page 127

13.5 MAL-SELECTION OR PARITY ERRORS
Mal-selection or parity errors may be caused by the
latch pushers contacting their latch extensions when
an unselected pusher is against its armature. There
should be a minimum of .002" clearance (Fig. 1A)
between the pusher and the latch extension when the
pusher is against its armature. To check this adjust-
ment, turn machine power off, trip the cycle clutch,
and hand cycle a few degrees through a cycle. The
pusher cam follower should be on the low dwell of the
pusher cam.
Latch Extension
Figure 13.1
Machine Cycled To
Low Dwell Of Cam
.002"
PRINT AREA IN OUTPUT MODE
Interlock Open
Driver or Wiring
or Reed Re lay
No
No
Magnet Coil Bad
Armature Binding
Knock Off 14.3
Failure
10Cycie
No
Yes
Yes
EXTRA
Cycles
See 11.0, 14.8
14.3, 14.2
Yes
Magnet Assembly Adj. 14.4
Latch Lever Bile 14.9
Cycle CI. Adj.
Latch Lever Mounting 14.11
Bracket
Trip Link Adj. 14.10 .
Figure 14.0
PRINT MAGNETS
14.0 Print Magnets
14.1 The pusher to latch clearance must be .035" for a
II
pushers except the Check Latch which is .020" -
. 025".
14.2 The armatures must not bind when depressed manua Ily.
Check for oi I, di rt, residua I magnetism, and bent
armatures.
4-19
When operating the armatures manua Ily, be carefu I
not to bend or deform them.
14.3 The Cycle Trip Bail Knockoff Extensions must clear
the knockoff eccentri cs by .003" - . 008" when an
armature is manua Ily attracted .
14.4 A clearance of .001" - .010" must be maintained on
the horizonta I and verti ca I latching surfaces of the
armatures.