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Punch Check Lights
Causes are normally the same as those listed under
reader check lights.
Punch Check Brushes Out of Time
1. If
all digits are out of time, check the tension
of the second stepped feed roll.
2. If
the lower digits
(5-9)
are out of time, check
the tension of the sixth feed roll.
Punching Registration
1. Cards being punched off by one digit can be
caused by a loose main drive belt.
This usually
happens when the clutch latches, causing the belt to
jump one tooth on the first stepped feed roll drive
pulley.
2. Variable registration (12 through 9) may be
caused by intermittent rolls becoming polished. This
is caused by running the machine excessively without
cards. The intermittent rolls are vapor blasted and
running together shortens the life of the vapor blast.
3. Variable registration (12 through 9) may be
caused by insufficient roll tension. Tension trouble
can be caused by cam follower bottoming or a
weak
spring.
4.
If
registration is off all the way across the
card, check
the
mesh of
the
geneva gears, or for a
loose pin.
5.
If
vertical registration varies slightly, check
the pressure shoe s.prings for tension. Make certain
they have not become polished at a point where they
contact the card.
6. Varying vertical registration can be caused by
intermittent roll closing too soon and moving card
9-2
slightly at the end of the previous geneva cycle.
7. Skewed punching and card marking can be
caused by the trailing edge of the card not traveling
past the forward aligners at least 1/32" .
8. If
horiz.ontal registration is varying, check the
side aligner adjustment.
Dropping Punches
1.
Check the interposer to punch clearance. It
should be .005" to .010".
2.
Check
the
clearance between the lower side of
the punch magnet armature and its latch. It should
be .005" to .010".
3. Check the punch magnet armature pivot rod
clearance.
It
should be .001" to .008".
4. Check for bent or loose punch magnet armature
leaf springs.
5. The miniature punch magnet connector ter-
minals can become dislocated.
A poor connection
can result.
Multiple Punches
1. Check
the
clearance between the lower side of
the punch magnet armature and the latch for at least
.005" .
2. Broken latch springs or latch spring hooks.
Damaged Cards or Jams
1.
Intermittent errors and card jamming may be
caused by loose or damaged timing belts.
2.
If
cards are being nicked on the leading edge by
the punches, check the timing of the first stepped feed
roll.
3.
If
the punch unit cuts long holes or is tearing
holes, check the punch unit timing.
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