Bell System Practices 2636CA Service page 12

SECTION 502-612-4 1 0
2
20 IG-V)
e---=- -'-'- --7
ANY "A� RELAY
IN IAI OR IA2
LINE CIRCUIT
"A"
.-:ru �
6c
(NOTE
I
I
2M
AI
GRD' I
4
LEGEND:
PU -P ICKUP KEY
H- HOLD KEY
LS- Ll NE SWITCH
HSIAI- HEADSET JACK A
Page 12
IBSP
502-612-'f10-i05 1976'0�-12.jpg
8
LS
(O-W)
CH
6
5
>-+-<
*
INSULATED AND STORED
t 0-161488
USE CONNECTOR OR SPARE TERMINAL
LEADS INVOLVED IN MODIFICATION
{
FROM 0) BINDER
-
LINE SWITCH
L S
- P ICKUP
PU
-
CHAINING
CH
Fig. 4-Modification for Priority Hold
PU
3)
I
I
Fig. 5-Busy Lamp Control Circuit Using 6C KTU
Scanned by Frank Rarrell, (Cowooy Frank) Castle Rock, Colorado Oct
1ST HOLD
KEY
7
(W-0)
6 (
2ND HOLD
KEY
NOTES:
I. (Y-BRI MOUN TING CORD LEAD DESIGNATED BL
WHEN
2. A LAMP INDICATOR
51 OV)
A (I OR 52A (24V) LAMP
OF A KEY SOCKET
OR LAMP
ARE USED, 51A (IOV)LAMPS
ONLY
0
AVO I OVERHEATING.
3.
WHEN USING 6C KTU, THE STATION CABLE LOOP MUST BE LIMITED
TO 2 !1 OR 500 FEET OF 24 GA. W IRE.
5
(Y) •
24
(0- SKI
*
(W-0)
7
(BRI
LS
(YI
NOT USED.
IS
IS USED BUSY EITHER
FOR LAMP,
MAY
BE USED. THE LAMPS
IF
TELEPHONE SET
INSTALLED IN A
BE USED
SHALL TO
05, 2012 16:��
HS(A)
A