:
Ul
CD
"'
NOTE'
LINE SWITCH Off-HOOK SEQUENCE'
de
CLOSES
cb
CLOSES
fg
OPENS
( ) CURRENT COLOR CODE
( ( MD COLOR CODE
*
INSULATED AND STORED
]
UNDESIGNATED
I
TERM.ON NET\IORK
TERMS:ARE ON
� TERM.OH TERM.BOARD 2 HRM.BOARD I
HEAD
LEGEND'
ON
DP
LS
HS
(A)
HS
(B)
FL
G3AR
DIAL orr NORMAL CONTACTS
DIAL PULSE CONTACTS
LINE SWITCH
517A JACK A
517A JACK B
FLASH KEY
c
TELEPHONE
SET RCVR
HANDSET
Ll
0
G
(R-G)
[S-W)
RCVR
J
0
��
L2
0
(W)
(w)
(BK-BR )[G-Y)
FL
G3AR
(BR-BK)
[
BR
)
5
(W-BR )[BK-BL)
GN
I
(BR-R )[G-BK)
HANDSET
Lll
b
TRMTR
425D NET\IORK
151D AMPLIFIER
Bl
(BK-BL)
B
[0-BK)
IR-BL)
[0]
6
5
4
(Y-G)
(S-Y)
6 �
HS(a)
IW-G)[Y-BK]
��;14337
226A
6
HS
(B)
(W)
ON
(R)
[S-R)
LS
(BK)
(S-BK)
(W)
(S-R)
[
R-G
)
2,
(R)
IND
(G-BK)
(R-BK)
(G-R)
(Y-W)
KS-14337
TO rIG.
4 OR 5
f Q
A
(w-o)
[R-BK)
AI
(0-V)
(Y)
BL
(Y-BR)
(Y-BK)
(V-BL)
[G)
(BL-V)
(R)
R OR Rl
(S-Y)
[Y-BL)
B OR 81
(Y-S)
[Y-11)
Rl
(BL-R)
(BR-W)
[S-BR)
(BK)
HEAD
�
(BL-Y)
TELEPHONE
(R)
SET TRMTR
IBL)
IO-Wl[9]
HS
(A)
(0-BK)
(BL-W)
IBR) [S-G]
2
3
LS
(Y)
c
(S)
(W-BL) (G-BL)
6
(R)
(S-R)
AI
7
(BK)
IS)
DIB RINGER
(S-W)
5
*
c
d
.
(BL-W)
[O-R)
FL
(G OR BL) RR
I
OP
(BL)
4
(S-BK)
(G)
[
S
-
Y
)
(W-G) ( Y-BL)
(0-G)
3 �
(
BK
-B
L
)
(G-W)
KS-13490,LI
RESISTOR
(BK-Gj
(O-W)
4�
HS
(B)
(BK-S)
(S-BL)
C
I
(II)
[S-BR)
Fig. 3--Early 636- and 637-Type (MD) Telephone Set, Connections (Amplifier Wired for Polarity Guard Diode
Protection)
BSP
502-610-410-i02_1972-04-05.jpg Scanned by Frank Harrell, {Cowboy Frank) Castle Rock, Colorado Feb 04, 2012 14:14:12
151D
AMPLI
r
IER
(Y-BL)
4
(BK-BL)
v
[
TPA
505024
c;;
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m
n
....
5
z
"'
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0
0
