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Faulting and maintenance
Faulting and maintenance
7.1
There are no user-replaceable parts in the system. In the event of
problems, faulting of the system is limited to checking the switch
settings, voltage links, functional testing, mains plug or input fuse
replacement and changeout of the System phone or CCV. A basic faulting
flowchart for the 2+8 is given in Figure 7.1.
If the customer's 2+8 system suffers from repeated lock-ups or crashes
for no apparent reason, ask the customer if any other electrical appliance
is being switched on or off at the time the system stops working. The 2+8
has designed-in mains interference suppression, line surge protection,
and electrostatic discharge immunity. However, it is not possible to
protect the system entirely from extreme levels of external interference
and these can cause the central processor to stop working. The only
immediate remedy is to power the system down and then up again.
If calls are being disconnected for no apparent reason the cause must be
isolated to either the 2+8 system or the local switching network. A
suggested method is to change the CCV and note if the fault still persists.
Extreme levels of external interference can cause call disconnection
which is usually followed by a complete system crash.
7-1
TPU 1371 Issue 3 (4/91)
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