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2. Check to see that the equipment gates are
Routine preventive maintenance of the switch-
properly fastened.
board consists of a systematic series of inspection,
cleaning, and routine operational check procedures.
3. Check to see that the circuit card assembly
The routine checks are designed to be performed
retaining bars are properly fastened.
without disturbing the equipment any more than
4. Check for accumulations of dust, dirt, or grease
necessary. Do not make any adjustments while
in the cabinets. If the cabinets require cleaning, clean
performing preventive maintenance, and avoid
them according to the applicable MRC.
moving equipment wiring when inspecting or
cleaning the equipment. Preventive maintenance
Attendant's Cabinet
should be performed according to the maintenance
requirement cards (MRCs) associated with the system.
Inspect the attendant's cabinet using the following
The following paragraphs will discuss some of the
procedure:
more common preventive maintenance checks.
1. Check for accumulations of dust, dirt, or grease
GROUND FAULT DETECTION PANEL
on the cabinet. If the cabinet requires cleaning, clean it
according to the applicable MRC.
This check should be accomplished daily using
2. Check to see that the push-button switch retainer
the following procedure:
bars are in place and properly fastened.
1. Check the two meters on the panel; both meters
3. Check the telephone set handset for worn or
should read in the OK region.
damaged components.
2. Momentarily operate the spring-loaded
METER TEST switch. Both meters should read in the
SUMMARY
OK region.
3. If both the meters read in the OK region in steps
In this chapter, we have discussed the purpose of
1 and 2, there are no ground faults and the check is
the automatic dial telephone system. We have
completed. If either or both meters do not read in the
explained how the type G telephone sets used with the
OK region in step 2, notify your supervisor.
system operate and how they are maintained. We have
also identified some of the more common troubles
HINGES AND LOCKING MECHANISMS
associated with the telephone sets and the procedures
for correcting the troubles.
The hinges and locking mechanisms of both
We have discussed the functions of the automatic
cabinet doors and the four equipment gates should be
dial telephone switchboards and identified the various
cleaned and lubricated once a week.
switchboards and the automatic switching equipment
used in the switchboards. We have described the
CABINET INSPECTION
function of the attendant's cabinet used with the
The two switchboard cabinets and the attendant's
switchboards. We have also discussed the various
alarms associated with the switchboards and the
cabinet should be inspected once a month.
procedures for isolating and clearing these alarms.
Switchboard Cabinets
We have discussed some of the procedures used
in performing preventive maintenance on the
Inspect the two switchboard cabinets using the
switchboard and the attendant's cabinet, and we have
following procedure:
discussed shore lines and how they are connected to
1. Open the cabinet doors.
the system.

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