Comdial Executech 2232, Manual

Page: 66 / 80

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