AT&T Bell System Plant Series Service Manual page 8

SECTION 502-542-400
BL (Y-BRl
44f---------------------------------~
2
44
24
/ A I
BL
SP
A.
WITHOUT
I
HOLD
(G-BK)
HS
(BR)*
(0-W) (Y)
t
!BRl
*
IB
LS
(Y-BR)
(BR-V)t
Mnc
ADD STRAP
~
'U '<./
8.
WITH
I
HOLD
H-HOLD KEY
HS-HEADSET ON-OFF KEY
LS-
LINE SWITCH
@-WITHOUT BUSY LAMP
/
4
(Q-BK)*
I
(Y)*
'
H
@-WITH BUSY LAMP, USE KS-15724, Ll DIODE
*-LEADS INVOLVED IN MODIFICATION
NOTE:
ALL TERMINALS ARE ON KEY TERMINAL BOARD.
I
@
®
~~
6
Fig. 2--1563HB (MD) Telephone Set-lA 1 or 1A2
Key Telephone System, I Hold and/or Station
Busy Lamp Modifications
Page 8
8 Pages
(BRl;
1\
(BRl*
HS
(G-BKl*
®
1
c
2
LB
(O-W)
IB
® @
(Y);
)
b
LS
_,_
a
@
L
G OR SG
(BR-Y)
t"
SG
19
0
BL
Y- R
B
l:
44~---------------<
X
__ ® ______________ ~~4
3 (S-Y)
LS
ct
(G)
(W)
(S-Rl
H-
HOLD KEY
FL-FLASH KEY
HS-HEADSET ON-OFF KEY
LS-
LINE SWITCH
@-WITHOUT BUSY LAMP
@-WITH BUSY LAMP
9 (Yl*
f
-NETWORK TERMINAL UNDESIGNATED TERMINALS
ARE ON KEY TERMINAL BOARD.
i-
LEADS INVOLVED IN MODIFICATION
Fig. 3-1563HB (MD) Telephone Set Converted for
lA Key Telephone System, With or Without
Station Busy Lamp
I