AT&T Bell System 1A Hardware Tests And Adjustments page 2

SECTION C54.204
J.
RELAY
SETS
3.01 The KS-8230-Ll and L2 relay sets have carbon con-
tacts to take the arcing that occurs due to signal
lines being equipped with a large number of signals. The1le
carbon contacts, when badly worn, may be replaced with
new carbon contac-ts .
3.02 The relays and other parts of transformer relay sets
used on 1 B Code Calling Systems do not normally
require any adjustments. If any of these units become de-
fective, replace with a 11ew or repaired unit.
3.03 The relays in the KS-7340 and KS-7357 relay sets and
the KS-8233-L2 transformer relay set have a two-
position armature air gap. The close air gap should be used
for manual ringing telephone lines and the wide air gap should
be used for machine ringing telephone lines, especially in dial
areas.
4. SIGNALS
4.01 Bella and Chime Sl,nala require no adjustment or
lubrication except the chime signals which have an
adjusting screw at the bottom of the plunger guide for ad-
justing the volume of the signal. The volume should
be
adjusted to meet the subscriber's requirements. If plunger
should stick in its guide, remove guide and plunger if practi-
cable and clean with carbon tetrachloride. If it is impracii-
cable to remove these parts or cleaning does not correct
difficulty in those cases where the plunger and guide
cat!
be removed, replace the entire signal.
4.0'Z Hornat Foreign substances may collect between the
diaphragm and the front plate. In these cases remove
front plate and brush out the dirt (horn plate position should
be noted at the time of removal, so it may be replaced in its
identical position). The volume of sound emitted by horns may
be adjusted by means of a screw and lock nut which is provided
for this ourposF;. As in the case of bells, the volume should
meet the· subscriber's requirements. Defective horns shall be
replaced.
4.03 Sisnala bavins
relay, which operate on telepho.-
riDl(iDir Toltage
have a two-position armatu~e air gap.
The close air gap should be used for manual ringing tele-
phone lines and the wide air gap should be used for machine
ringing telephone lines, especially in dial areas,
S.
'l'ESTS
5.01
If
the code calling system becomes inoperative, check
the 312002 Littelfuse inside the code sender aud those
in the power supply circuits.
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5.oi
After makmg any adjustments or replacements in the
code calling apparatus, test the system by sendin&
one of the codes, preferably a code that is unassigned by the
subscriber.
5.03 See that all signals are operative and that their vol•
ume is satisfactory to the subscribu.
5.04 Note whether the speed of the operating . unit in the
code sending station is within the specified limits
and that the busy lamp in the top of the code sending station
is operative.
5.05 If night connection arraniements are provided con-
nect the code calling system for night connee;tions
and have the attendant ring the e'Xtension station with which
the code calling system is associated. Note that the signals
sound once each time ringing c.irrent is applied to the ex-
tension station.
5.06
H anr particular signal or group ol signals becomf:
inoperative inspect the signal control relay set or
transformer relay set associated with the signals and .,he
relays in the signafa, if the signals are equipped with relays.
Replace any 4efective apparatus. Difficulty might ~lso
be
present in the telephone wiring and connections and if
10,
should be corrected. Defective power wiring, appliance out-
lets, etc., should be bro1,.ght to the attention of the subscriber
who should arrange to have the defects corrected
by an
electrician.
s.w
Check the
starting running, and pulsi'lg contacts in tlre
code sender for fuhure to operate properly, or for dirt.
Notes
Power should be disconnected from the set before
cleaning or adjusting any contacts.
The pair code contacts on the List
1
sender may be burnished
.by removing the back of the set. The two pairs of contP.cts on
the List 2 sender are acces!ible for burnishing only when the
unit has been removed from the housing. Contact pressure
may be established at the code ccntacts for the burnishing
operation by press~ on the contact operating bar. In order
to burnish the starting or motor control contacts of either
List
1
or List 2 it
will be
necessary to remove the unit from
the housing. Contact pressure at the starting contacts may be
established by fully depre~sing any key. The motor control
contacts can be btirolshed
if the motor ls stopped before the
cam reaches the end of the cycle,
Le. contacts are closed.
5.08
When the selector sw!tch ls
In
the
"N"
posttlon
check that the code ls repeated only three times before
stopping. When the selector switch ls in the "C" position check
that t.he code ls repeated continuously or unt'J the switch i.,
!'estored to the
"N"
position after which the sender will complete
its cycle and atop.
&.
RADIO lNTERF'ERENCE
6.01 When trouble is encountered with radio interference:
and the source has been determined to be either the
code sending station or signals, refer this conditior. to your
supervisor or to the engineering departmenL