Bell System Practices 564HK Service page 3

AI
BL
NOTE:
(
[ l
Fig. 1 -Station Busy Lamp Circuit (Without I Hold
Feature)
AI (0-11)
KS-15724,LI
DIODE
(
SP
ADD
S R P
T A
•
L E A D S INVOLVED IN MODIFICATION
@
WITHOUT STATION BUSY LAMP
G)
WITH STATION BUSY L AMP
LS
LINE
H
HOLD KEY
( I C U R R E N T COLOR CODE
[
)
M D COLOR CODE
Fig. 2
BSP S02-S41-407-i03_1973·06·03.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado
(0-11)
-BR 1
( ) (BRJ
Y
( )
NOTE
A O O KS-15724, L1 OIOOE
I
CURRENT COLOR COOE
MO COLOR CODE
t
INDICATES LEAD INVOLVED
IN MODIFICATION
(Yl+
)
(0-BKl+
G-Y
(WI
SWITCH
-1 Hold Arrangement
PICKUP-SIGNAL KEY CONVERSION
CONVERTIBLE
KEY
OPTIONS (NOTES)
HPPPPP
HPPPPS
HPPPSS
HPPSSS
HPPP*P*S*
HPP*P*P*S*
* These pickup key options are used on private
or intercommunicating lines with the signal key
common to each line. The signal key, under con­
trol of the line switch, will ·operate the signal
circuit of each line when associated pickup key
is depressed. Use S lead on 2nd, 3rd, or 4th
pickup key as required.
Notes:
1. All convertible key positions are arranged
in the factory as pickup positions. To con­
vert a key position from pickup (locking)
to signaling
P-12A892 screw detail from plunger at the
key position to be converted. Make neces­
sary connection changes as shown in Table
A. To convert a key position from nonlock­
ing to locking, insert P-12A892 screw de­
tail.
2. When keys are converted for signaling, the
S lead of key involved provides the signal
circuit and SG lead provides the common
signal ground.
Feb 02,2012 19:09:53
ISS 3, SECTION 502-541-407
TABLE A
564HK/HL
KEY LEADS
BR Y-BR S-R
M M
M
M M M
M M SG
M
X SG
X M 5H
X X 5H
(nonlocking), remove
BR-BK
X
SG
X
X
N
N
the
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