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IMI 66-047
If erratic light indications or ring signals occur at a paired
station, an open data pair at either station
station with an open data line may work properly on a short loop but
fail on a long loop.
per the checkout procedure given in Chapter 2.
If a fault occurs which
drawn, the overload paired stations are disabled by circuit action.
Disconnect the disabled stations and reconnect them one at a time to
isolate the faulty one.
Failure Analysis
----- ---- ___
Figure 4-2 details a failure analysis flow chart to assist a service
technician in isolating a failure in a defective system.
isolate a failure is to
suspected one.
with the system.
use
Connecting and disconnecting stations to the
the stored station auto/speed dial memory data.
in the KSU memory and not at the individual stations.
KSU, however,
causes
memory dialing numbers as well as all COS programming data.
Test the wiring of stations showing this symptom
more than 300
causes
substitute
This is the recommended failure isolation method to
all stored memory to be lost.
may be
of current to
ma.
a known good assembly for a
system
4-5
Maintenance
the fault. A
be
One way to
does not affect
This data is stored
Replacing the
This includes all
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