Bell System Practices AT&T Plant Series Identification, Installation, Connections, And Maintenance page 5

(b) The line switch and ne .~r!. ,we riv~. (1 to
the chassis assembly and ~t~ould not ~'
removed.
If maintenance is required, rel)l~,
chassis assembly.
(c) Maintenance of the dials is the same as for
6-type rotary dials.
Refer to Section
501-162-100.
(d) Refer to Section 501-259-101 for maintenance
of P 1A ringer and Section 512-620-200 for
optional speakerphone components.
(e
Refer to connection
locating and clearing
figures as an aid in
trouble.
–i
1SS 2, SECTION 501-410-101
TABLE B
1Al OR 1A2 KTS AND 3-TYPE SPEAKERPHONE
CONVERSION (SEE NOTE)
CONNECT TO
NET. TERM.
REMOVE
MIRE
OR
LEAD COLOR FROM NET,
SPEAKER.
TERM. IA1 OR
PHONE
1A2 KTS
WITH
IA I OR
1A2 KTS
Line
(BR)
c
G G
Switch'b
(w)
F c
c
(s)
A L2 -i
Ringer
(R)
K
A A
(BK)
G
F F
MIW Cord or
.
Equiv.
K L1
Note: For lA1 or 1A2 KTS only, use D4BJ
mtg. cord. For lA1 or 1A2 KTS with speaker-
phone use D1OR mtg. cord, connect as shown in
Fig. 5.
* The telephone set may be dialed in the on-hook
condition with speakerphone option,
t Use D-161488 connector to connect (S) line
switch lead to LK lead of transmitter.
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