Maintenance - AT&T Bell System Plant Series Service Manual

SECTION 502-611-403
3. MAINTENANCE
3.01
Maintenance of these sets should be limited
to the replacement of complements easily
obtained in the field.
3.02 Maintenance of individual components of these
sets such as keys, ringers, etc, is covered
in sections pertaining to that component.
3.03
No maintenance of the TOL'CH-TONE" dials
should be attempted. If dial is defective,
replace dial.
Page 2
TABLE A
POLARITY GUARD CONNECTIONS
(P-90D 197 GUARD ASSEMBLY)
REMOVE CONNECT
FROM TO
LEAD
NET
TERM.
NET
TERM.
~OLARin
BLOCK BLOCK GUARD
Dial BK
RR
T
Switch Hook
w
7
s
Jacks BK-S 7
s
Polarity
w
7
Guard G
RR
Note: For use when specified by local instruc-
tions for end-to-end signaling.