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1SS 4, SECTION
502-600-100
(4)
Depress
the top button
of the installed
key
as
in
(2)
and
hold
its
latch bar
in
the
forward-most
position
as in (3).
Observe
the
effect
of the Iatchbar
of the (reference)
key on
the
pivot
bar
while
slowly
depressing
its
top
button.
If the
pivot
bar moves
significantly
in
the foward
direction,
the installed
key is positioned
too low.
To correct,
loosen
the screws
and very
slightly
raise
the key until
the pivot
bar has no
perceptible
forward
motion.
Retighten
screws
and
recheck
(3).
Note:
If
an
installed
key
does
not
meet
the
(no
perceptible
latchbar
movement)
requirement
using
this
procedure,
and
there
is reason
to suspect
that
the
reference
key
is
out
of
position,
reposition
all
keys
as
follows.
(5)
Loosen
the
screws
of the
(reference)
key.
With
no buttons
down and the latchbar
held
in, shift
the
reference
key until
latchbar
notch
is centered
over
edge
of
pivot
bar
(Fig.
7).
Tighten
screws while maintaining
key and latchbar
position.
(6)
Moving
from
left
to
right,
progressively
position
and check
each
key relative
to the
reference
key as in (3) and
(4).
Note:
If
the
installed
key
still
does
not
meet
the (no perceptible
latchbar
movement)
requirement,
replace
key.
It should
not
be
necessary
to apply
undue
force
to move
and
position
the 590- and
650-series
keys.
*
(7)
2.14
(1)
(2)
(3)
Remove
latch-bar
return spring and
retaining pin on key
when adding or
replacing
keys.
Install
key
designation
strip,
light
shield,
housing,
mat,
and
faceplate
as required.
Remove
(635-type ) keys from
telephone
sets
as follows.
Loosen
captive
screws
at each
end
of key
module.
Lift
key out of key frame
disengaging
key
latch
arm
from
pivot
bar.
Turn key counterclockwise
and unplug 508-type
and
509A plugs
(Fig.
8).
Fig. 7—Positioning
590
and
650
Series Keys
(4)
Remove
contact
strips
from
key module,
if
provided.
2.15
Install
(635-type)
keys
in telephone
sets
as
follows.
(1)
If
required,
install
proper
contact
strips
furnished
with
635-type
keys ( Fig. 9).
(a)
Key modules
with
six pick-up
keys
must
be equipped
with a S401,57218 (green
lead I
and
a 840157200
(red
lead)
contact
strip.
(b)
Key modules
with
five pick-up
keys
and
a
hold
key
must
be
equipped
\vith
a
840151138
(green
lead)
and
a 840151120
{red
lead)
contact
strip.
(c)
Key
modules
with
four
pick-up
keys,
a
hold
key,
and
a
cutoff
key
must
he
equipped
with
a 840151047
(green
lead ) and a
840151039
(red
lead)
contart
strip.
(2)
Connect
508-type
and 509A plugs
to proper
receptacles
(Fig.
8).
Note:
(h
initial
installation
the
l)$type
and 509A plugs
should
follo~v the same
color-
sequence
for each
key
module:
Pink
(Hold
Key),
Light
Beige
(('haining
S\vitch),
!dlue
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