AT&T Bell System Plant Series Service Manual page 2

SECTION 502-541-401
Push buttons
2.06
Replace cracked pushbuttons or collars.
Remove accumulated dirt or film from collars
and pushbuttons with a water dampened cloth.
DO NOT USE SOL VENTS OF ANY KIND. If
cleaning does not correct binding of pushbuttons,
replace button and collar assembly. It should be
carefully aligned to avoid interference with removal
of replacement of housing.
Page 2
TABLE A
TERMINATIONS AT CONNECTING BLOCK
LEAD KEY CONN
DESIG
CABLE
BLOCK
MTG
CKT
--
r - - -
r-------
CORD
lA 1A1 D TYPE TERM. NO.
LEADS
R R BL 1
1
R
Line
T
T
w
2 G
r--
--~----
r-------
f - - - - - -
1
B
A1 0 4
..., y
H A
w
5 00 BK
"'...,
1-----
,_...,
- - -
- - - -
R R G 6
ol ::l
BL
Line
T T
w
7
z>Q
w
r----
r---
""
- - - -
..>::'"
2
B
-
BR
9
<)0
BR-R
H A
w
10
oU
BR-G
~
-----
- - - -
R R
s
3
BR-Y
Line
T T
w
8
BR-BK
~- - -
- -
- - - - - - - - - - - - - -
3
B
-
BL
1 2
BR-BL
H A R 2
BR-W
Ringer R R 0 4
Y-BL
or Buz B B BK 5 Y-W