SECTION 502-612-4 1 0
8
LS
2 AI
(O-W)
20 IG-V)
CH
e---=--'-'---7
6
>-+-<
5
7
*
INSULATED AND STORED
(W-0)
1ST HOLD
KEY
6
2ND HOLD
KEY
t
USE
0-161488
CONNECTOR OR SPARE TERMINAL
ANY "A� RELAY
IN IAI OR IA2
LINE CIRCUIT
LEADS INVOLVED IN MODIFICATION
FROM
{
0) BINDER
L S
-
LINE SWITCH
PU
- P ICKUP
CH
-
CHAINING
Fig. 4-Modification for Priority Hold
(Y) •
(0- SKI
24
(W-0)
*
"A"
PU
7
6c
.-:ru �
(NOTE
3)
I
I
I
I
(BRI
LS
(YI
AI
2M
GRD'I
4
Page 12
LEGEND:
PU -P ICKUP KEY
H- HOLD KEY
LS- Ll NE SWITCH
HSIAI- HEADSET JACK A
NOTES:
I. (Y-BRI MOUN TING CORD LEAD DESIGNATED BL
IS
NOT USED.
2.
WHEN
A LAMP INDICATOR
IS USED
FOR
BUSY
LAMP,
EITHER
A
51
A (I
OV)
OR 52A (24V) LAMP
MAY
BE USED.
IF
THE LAMPS
OF A KEY
OR LAMP
SOCKET
INSTALLED IN A
TELEPHONE SET
ARE USED,
ONLY
51A (IOV)LAMPS
SHALL
BE USED
TO
AVO I
0
OVERHEATING.
3.
WHEN USING 6C KTU, THE STATION CABLE LOOP MUST BE LIMITED
TO 25!1 OR 500 FEET OF 24 GA. W IRE.
Fig. 5-Busy Lamp Control Circuit Using 6C KTU
HS(A)
IBSP
502-612-'f10-i05
Scanned
Frank Rarrell, (Cowooy Frank) Castle Rock, Colorado Oct
05, 2012
