AT&T Bell System Plant Series Installation And Maintenance Manual page 6

L
SECTION 512-515-200
• If the radio frequency interference is
heard on the loudspeakers or on a hand-
set when the handset is off hook and
the push-to-talk relay is actuated, con-
nect a KS-13814, List 1 (0.05 p.f) ca-
pacitor between terminals 2R and 2T
of the control unit terminal strip.
• If radio frequency interference is heard
on the handset after the quieting relay
has been actuated, connect a KS-13814,
List 4 or 542L (0.1 p.f) capacitor be-
TABLE B
tween terminals J1 and 2T of the con-
trol unit. Two KS-13814, List 1 (0.05
p.f) capacitors in series may be used.
(g)
Associated Telephone Sets
• Refer to appropriate sections in the Divi-
sion 502 for maintenance of the various
telephone sets associated with the farm
interphone system.
• Replace G5KR handset if push-to-talk
switch does not function properly.
2A FARM INTERPHONE
COMMON TROUBLES AND PROBABLE CAUSE
TROUBLE
PROBABLE CAUSE CORRECTION
Incorrect or defective Rearrange, repair, or
Individual speaker not
wiring replace wiring
operating properly
Defective speaker Replace speaker
Incorrect or defective wiring to
Rearrange, repair or
Weak or noisy output
one or more speaker locations replace wiring
on all speakers
Defective control unit Replace control unit
Crosstalk between
Split cable pairs
Rearrange wiring
CO line and
Output of control unit
Replace control unit
intercom line
too high
AC power supply off or Check AC power or
plug pulled out place plug back in outlet
System completely
Replace fuse (3/4 amp)
dead Blown fuse
Defective control unit
Replace control unit
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