IBM 1402 Instruction & Reference Manual page 12

Card read-punch
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DRIVE
ARM
KEEPER
RATCHET
Figure 2-4. Magnet Assembly Adjustments
clutch assembly is installed or when complete adjust-
ment is to be made of the center plate assembly and
clutch magnet assembly. When this is to be made, the
read clutch locating plate gage
(PiN
610147) must be
used.
NOTE: Use of this tool will insure a parallel condi-
tion between drive arm latch surface and the latch at
latch-up time (Figure 2-4A).
Proceed to step 5 for the armature, latch, -and
magnet adjustments.
The following. sequence is used to adjust the clutch:
1. Remove clutch pulley as described in Clutch
Pulley Assembly Removal Procedure.
2. Remove latch keeper and latch from center
plate assembly.
3. Position locating gage on center plate assem-
bly studs and clutch pulley assembly shaft (Figure
B
SEE
NOTE
ADJUST SCREWS
FOR.020" TO
• 022" CLEARANCE
HERE
-_-l.--
CHECK. 001" TO
.003" CLEARANCE
HERE
NOTE: .008"
to
.012" UNLATCHING
CLEARANCE SHOULD GIVE 75% (OR
MORE) LATCH SURFACE CONTACT
LOCATING BLOCK
2-5). Position and secure locating block withcenter
plate assembly as far left as possible. Remove gage.
4. Reinstall latch keeper, spring, and latch.
Follow Clutch Pulley Assembly Procedure for re-
assembly of clutch pulley assembly.
5. Adjust armature pivot bracket to maintain
.002" to .005" clearance between armature and core
(Figure 2-4).
6. There should be .020" to .022" clearance be-
tween armature and yoke with latch against backstop
(Figure 2-4).
7. Manually attract the armature and position the
latch assembly plate for a .008" to .012" unlatching
clearance between the latch and the clutch drive
assembly. Tighten center plate assembly mounting
screws. At this time, there should
be
at least 75% of
the latch contacting the drive arm assembly in a
2-3

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