Bell System Practices 630 Series Installation And Maintenance Manual page 10

IVote: Telephone sets associated with line
concentrator units will have the 840362909
printed wiring board assembly mounted in
the 235- or 236-type KTL-'s.
!!lr
Lamps used with these sets to indicate
;
station busy lamp feature should be
of the 51A type.
2.30 To
provide station busy lamp feature with
telephone sets equipped for both handset
and headset operation and 635-type keys, a D-180463
Kit of Parts consistin~ of an 840362909 Printed
W;iring Board Assemb]y and 840361836 plug
assembly. ordered separately, must be installed
(Fig. 19].
2.31
The printed wiring board assembly is provided
with adhesive backing to permit mounting
on any clean, flat surface.
2.32
The plug assembly is used to extend the
A lead through the chaining switch to the
printed wiring board.
Note: If all modules are not equipped \vith
keys only the printed \viring board assembly
is required. The plug assembly is used to
provide the chaining s~vitch function for the
last key if all modules are equipped with keys.
2.33
For additional information on station busy
lamp feature, refer to Section .502-110-100.
Page 10