SECTION 502-612-41 0
1ST HOLD
a
LS
7
KEY
2
A I
(0-W I
(W-01
6
44 SP
(Y-BRI§
j
(0-BKI
t
�
I
�
2
l4
20 IG-VI
CH
�· >-+--< s
*
INSULATED AND STORED
2ND HOLD
KEY
t
USE D
-161488
CONNECTOR OR SPARE TERMINAL
ANY "A• RELAY
IN IAI OR IA2
LINE CIRCUIT
t
LEADS INVOLVED IN MODIFICATION
FROM (0) BINDER
L $
- L INE SWITCH
PU
-
PICKUP
CH
-CHAINING
Fig. 4-Modification for Priority Hold
PU
(Y)
t
10- BKI
24
(W-0)
t
H
"A"
IBRI
IYI
�sCKTu�
I
I
NOTE
31
I
I
I
AI
'
7
2M
GRD
1
Page 12
LEGEND'
PU -PICKUP KEY
H-HOLD KEY
LS-LINE SWITCH
HSIA)-HEADSET JACK A
L
BUSY LAMP
(NOTE 21
LG
NOTES:
I.
(Y-BR) MOUNTING CORD LEAD DESIGNATED BL IS NOT USED.
2.
WHEN A LAMP
INDICATOR
IS USED
FOR
BUSY LAMP, EITHER A
51A
(IOV) 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
AVOID OVERHEATING.
3.
WHEN USING 6C KTU, THE STATION CABLE LOOP MUST BE LIMITED
TO 250
OR
500 FEET OF 24 GA. WIRE.
Fig. 5-Busy Lamp Control Circuit Using 6C KTU
BSP 502-612-410-i04_1975-03-12.jpg Scanned by Frank Harrell, {Cowboy Frank) Castle Rock, Colorado Feb 04,2012 16:23:25
HS(A)