Ring Communications CB901EX - Manual (Page 26)

CB901EX Operations Manual March 2011
SERVICE INFORMATION
CAUTION: Always turn power OFF before changing subscriber boards in the central exchange.
The CB 901EX system is a microprocessor controlled system and for servicing/maintenance a
certain level of such knowledge is needed together with some understanding of the software.
Remember that the system is bus organized. This means that all subscriber boards are «wired» in
parallel, except the master station connections. A fault on one of the subscriber boards may therefore
cause the whole system to malfunction. For trouble-shooting, follow the steps below:
a. Disconnect all the NFE 1625 (NFE 1525) Subscriber Boards.
b. Install one board at a time into the different plug positions until the faulty board is
located.
A master station fault may be located in the station itself, or on the subscriber board. Check both
with a known good station to pin point the fault.
The user can be requested NOT to use the system until an all-call announces that the system is
ready for use.
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