AT&T Bell System Plant Series Adjustment Procedure page 10

SECTION 032-709-701
Code or
Spec No.
Materials
Description
Toothpicks {hardwood, flat
at one end and pointed at
the other)
No. 22 Bare Tinned Copper
Wire
3.002 Due to the design and method of
mounting these keys, it will not be
practical to perform any of the adjustments
specified herei~ for lever-type keys unless
the ~ey is removed from the keyshelf. At
the time the key is removed, inspect the
entire key for possible faults and make any
adjustments that may appear necessary at
this time. This will insure that the key is
in propez· working order before it is
remounted.
3.003 To remove the key from the keyshelf
proceed as follows. Raise the key-
shelf and loosen the mounting screws with
the 3-inch cabinet screwdriver. Raise the
key out of the keyshel-r as far as is per-
mitted by the skinners. Place a No. 429A
or 429B key support inside the lugs on each
end of the key to support the key while
making adjustments.
3.004 When adjusting the 6013-ty.pe key,
remove the key from the box using the
3-inch cabinet screwdriver to remove tne
mounting screws and adjust the key in the
same manner as the 272-type keys.
Rotating-plunger-type Keys
*3.01 Cleaning (Rq 2.01)
(1) Clean the contacts in accordance with
Section 022-186-Sll. Clean other
parts as outlined in procedure 3.02(4).
3.02 Plunger
Movemen~
(Rq 2.02)
(1) Cracked, warped, or broken keytops of
a universal-type key may cause the
plunger to bind and thus prevent or delay
the release of the plunger. In this case,
replace the keytop.
(2) Loose or missing screws in the keytop
of a universal-type key may allow the
keytop to move and thereby cause the
plungers to bind. In this case, replace
the missing screws and tighten all screws
with the KS-6854 screwdriver.
(3) If the plunger of a universal-type key
binds in the slot, loosen the keytop
screws with the KS-6854 screwdriver and
shift the keytop until no bind occurs. If
binding still occurs, ream out the slot in
the keytop slightly.
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(4) Examine the key to determine whether
or not failure to operate is due to
dirt or a gummy substance forming between
the inside of the keyshell andthe plunger
or on the surface of the plunger spring
which rests against the plunger. To de-
termine whether or not this condition
exists on 272-, 406-,
498-,
538-, and
556-type keys, remove the key from the
keyshelf using the 3-inch cabinet screw-
driver to loosen the screws holding the
key to the keyshelf. If it is necessary
to clean the plunger and plunger springs,
remove the plunger from the keyshell. To
do this remove the plunger retaining screw
with the Starrett pocket screwdriver
No. 559A and remove the plunger. In order
to remove the plunger of a universal-type
key, remove the keytop and then remove the
screws holding the plunger unit to the key
frame with the 3-inch cabinet screwdriver.
Remove the plunger unit, the plunger re-
taining screw, and the plunger as described
above. When the plunger has been removed,
wipe it with a clean, dry KS-14666 cloth,
removing all the gummy substance. Clean
the inside of the keyshell and the surface
of the plunger springs which rest against
the plunger by means of a toothpick which
has been dipped in petroleum spirits. Do
not use the same toothpick for more than
one operation. When the plunger springs
are thoroughly dry, place the plunger back
in the keyshell without the plunger re-
taining screw. This is done so that a
preliminary test may be made. With the
key plunger in this position, rotate the
plunger a number of times to determine
whether or not it operates freely.
(5) If the plunger operates freely but is
sluggish in restoring to normal after
the plunger, keyshell, and plunger spring
have been cleaned in accordance with (4),
it is probably due to the plunger springs
not being properly adjusted. Failure of
the plunger springs to rest against the
plunger when in the normal position, or
unequal pressure of the plunger springs,
may cause this trouble. Since it is not
possible to adjust the plunger springs
while mounted in the keyshell, it will be
necessary to remove the spring assembly.
This is done by removing the spring assemhly
mounting screws with the KS-6854 screw-
driver and then removing the spring as-
sembly taking care not to lose the
insulators. Do not loosen the spring as-
sembly screw. When the spring assembly
has been removed from the keyshell, examine
the plunger springs to determine whether
the opposite springs are bent at approxi-
mately the same angle. If the requirement
is not met after the opposite plunger
springs have been adjusted so that they
are approximately equal, tension the plunger
springs slightly by bending the two springs
approximately equal amounts towards each
other. At this time make any readjustments