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b.
Place a
O.
005 inch shim between switch
button and link. Move switch until it
bottoms out.
c.
Tighten mounting screws to secure switch
in this position.
CA UTI ON : Feel the head loaded solenoid coil by
hand to inspect for overheating. The solenoid coil
is warm to the touch during normal operation when
24 vdc is applied. A defective Heads Loaded Switch
adjustment will cause 48 vdc to be applied to the
coil resulting in excessive heating. If the coil is
too hot to grasp and hold, the heads loaded switch
is not in proper adjustment.
13. Adjust the heads loaded switch
if
solenoid coil
is excessively hot (refer to procedures of
section 7.8.3).
14. Power down the machine.
7. 9 HEAD LOAD SPRING ASSEMBLY
NOTE: Removal and replacement of the head load
spring assembly is the same as described in
Chapter 4. Do not replace the counterbalance spring
assembly whenever a new head load spring assembly
is installed.
7.9.1 Head Load Spring Assembly Counterbalance
Spring Adjustment
NOTE: The head load counterbalance spring is not
installed on all machines, and this spring is not to be
replaced whenever a new head load spring is in-
stalled on machines. These procedures apply to
those machines which still incorporate the head load
counterbalance spring.
Adjustment of the counterbalance spring is
to
be
accomplished as follows:
1. With heads unloaded, position the counterbalance
spring perpendicular to the side of the head load
spring support.
2.
Check the force required to lift the spring support
off of the head. This force is measured at the
tab on the spring which contacts the head. If this
force is not 4 (±1) grams at the top head, and 9
(±1) grams at the bottom head, form the associ-
ated counter balance spring at the bend nearest
the mounting screw to deliver the required force.
3.
Repeat step 2
to
ensure that the required force
is maintained.
227 -5984 (9/65)
7. 10 CRASH STOPS
NOTE: Adjustment of front crash stop is the same
as described in Section 4. 10.
1.
7.10.1 Rear Crash Stop Adjustment
Use appropriate switches on the CE Panel to oper-
ate carriage in a reverse direction to detent on
track 000 against rear crash stop (near drive
magnet).
NOTE:
It
may be necessary to move the home
switch out of the way to accomplish the rear crash
stop adjustment.
Adjust screw on left end of rear crash stop
and tighten locknut so that a 0.003;
(±O.
001) inch
clearance exists between rear crash stop and
carriage.
Operate carriage, first in forward direction and
then reverse, to check that the 0.003,
(±O.
001) inch
clearance adjustment is maintained at the rear crash
stop when carriage is detented on track 000.
~':;OTE:
If the Home Switch was moved to accomplish
adjustment of the rear crash stop, it must be read-
justed as described in Section 7.11. 2.
7. 11 HOME SWITCH
7. 11. 1 Home Switch Removal and Replacement
1.
Remove all ac and dc power from machine.
2.
Remove leads from Home Switch terminals.
3.
Remove two binding head screws securing Home
Switch mounting bracket to actuator bracket.
4.
Remove binding head screws securing switch
to
mounting bracket.
5.
Replace Home Switch by reversing steps 2
through 4 and adjust switch according to
Section 7.11. 2.
7.11.2 Home Switch Adjustment
1.
Use appropriate switches on the CE Panel to
operate carriage in a reverse direction to detent
on track 001.
2.
Place a
O.
007 -inch feeler gage between the
carriage and HOlne Switch pushbutton and ad-
just the Home Switch adjusting screw until the
switch just transfers.
7.9
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Troubleshooting
