1SS 4, SECTION
502-600-100
Fig. 10—Current
Production
635-Type
Key and
Collar
&
/
NOTES:
1.
LEAD
END OF EARLY
PRODUCTION
STRIPS
wERE
BENT AT A 90 OEGREE ANGLE
2.
THIS
TAB MuSTEE
CUT OFF
wHEN
uSED
WITH
63 SBC5C
KEYS MA NuFACTUREO
AFTER
6-77.
Fig. 9 —Contact
Strip Used With
635-Type
Keys
concentrator
units.
(Refer
to the
section
on
modular
keys
in Division
512 for details
on
installing
the insulator/insulating
detail).
2.18
To provide
a second
hold
button
for
the
priority
hold
feature
on
early
production
telephone
sets, install
a 599H (MD) or 657L key in
the first
key position.
Current
production
telephone
sets
equipped
with
635-type
keys
will require
the
installation
of all or part of a D-180411
Kit of Parts
(depending
on the type mounting
cord) in the second
key module.
The kit consists
of the
following
1–840151161
1
1
–840151120
–840151138
plug
assembly
contact
strip
assembly
contact
strip
assembl}-
iVote:
Telephone
sets
equipped
with
D120K
and
D200S
mounting
cords
use the complete
kit
of parts.
Telephone
sets
equipped
with
D120M
and
D200AA
mounting
cords
require
the 635A5C
key and 840151161
plug assembly
only.
2.19
The
635AD5C
key
module
is equipped
to
provide
four
pickup
keys,
one
cutoff
key,
and
a hold
key.
The
key module
is used
in the
first
module
of the
telephone
set
and
has
to be
equipped
with
2 contact
strip
assemblies
2.15(1 )(c)
and
a
piggy-back
adapter
840155501
(Fig.
11)
accommodates
the
slate
508-type
mounting
cord
plug.
2.20
The
811218585,
(P-12.4858)
blocking
ring
is
used
to
make
an
individual
pickup
key
inoperative
on the
598-,
599-,
656-,
and
657-type
keys
and
is installed
as follows.
(1)
Remove
lamp
block
assembly
from
key
(Fig.
12).
1 –635A5C
key
(2)
Remove
button
retainer.
Page
7
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