TOA Electronics EX-16 - Manual (Page 32)

5.1 Fault in Exchange
* When the power supply unit or the CPU-16 is out of order, the same kind
of fault will occur at all stations.
* When the LAU-16 is out of order, a fault will appear only at a particular
station.
* If the exchange is out of order, the faulty unit must be searched out and
replaced.
Fault in exchange
Check the power unit
(See 4.3.2)
Replace CPU-16
Yes
Fault
No
No
Replace LAU-16
Yes
Replace DSM-16
Yes
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