Bell System Practices 630 Series Installation And Maintenance Manual page 7

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.
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