NOTE'
LEGEND'
F
425D NETWORK
LINE
SWITCH OFF-HOOK SEQUENCE'
de-
CLOSES
ON
-
D 1 AL orr NORMAL CONTACTs
Qp-
DIAL PULSE CONTACTS
cb
-CLOSES
to
-OPENS
( ) CURRENT COLOR CODE
LS-
LINE SWITCH
HS lA)
-
51 7A JACK A
HSIB)-
517A JACK 8
FL
-
FLASH KEY
*
INSULATED AND STOR£0 UNDES
I
GNATED
( ) MD COLOR CQD£
J
t
TERM.ON NETWORK
TERMS.ARE ON
+
TERM.ON TERM.BOARD 2
TERM.BOARD
I
HEAD
TELEPHONE
SET
(R-G)
(S-11)
(II)
4
u'
(BR-8K)
(8R)
5
(II-8R)
6
HSIAl
( ) R
C
V
R
G3AR
HANDSET
RCVR
)8K-8L)
GNt
(8K-BR) (G-Y)
FL
(8R-R)
(II)
ON
(G-8K)
RR
Ll0
0
G
L
2
0
0.JE-0
(R-BL)
(o)
6
6
G3AR HANDSET
TRMTR
R
5
1510
AMPLIFIER
(BK-BL)
(0-BK (
4
(Y-G)
HSIBl
(R-8K) 1!
(G-R)
2211A
INO
II
I
2
3
4
151D
ANPLIF I ER
(S-Y)
L
(Y-11)
+
KS-14337
CAP.
(R)
(S-R)
(BK)
(S-8K)
(II)
(S-R)
LS
(8L-R)
(R-Gj
(0-G)
(8R-11)
(G-8K) ( S-8R)
(R)
(R)
HEAD
fl
TELEPHONE
SET TRMTR
(II-G) (Y-BL)
21
5.
+
KS-14337
CAP.
(II-G) (Y-8K)
6'
(R-G) (S-11)
A
(11-0)
(R-8K)
1
0
-
W
)
[S]
HSIAl
(0-8K)
2
3
IBR)
[S-G]
LS
(Y)
(s-w]
(G OR 8L)
3'
(8K-BL) (G-W)
c
v
KS-13490, L1
*
DP
RESISTOR
A
I
(0-V)
(Y)
•'
(8K-G)
(D-W)
E
TO
FIG.
8L
(Y-8R)
(Y-8K)
(8L)
I
Y
-
B
L
)
[R-W]
4 OR 5
(V-8L)
(G]
R
(BL-V)
(R)
I
(W-BL)
(G-8L)
(8L-W) (0-R)
4
(S-8K)
3
2
(8K-S)
(S-8L)
2
B
(R)
(S-R)
At
FL
HSIBl
(W)
(S-8R]
R OR Rl
(S-Y)
(Y-8L)
(G) [S-Y]
d
cl
LS
8 OR 81
(Y-S)
( Y-W)
7
(8K)
(S)
(0-Y)
(R-BL)
I
018 RINGER
Kt
Fig. 2-Early 636- and 637-Type (MD) Telephone Set, Connections
SSP
S0l-610-410-i02_1972-04-04.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Feb 04,2012 14:13:46
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