Bull ESCALA E250, Use And Maintenance, Page: 77 / 162

Maintaining the System
4-17
Identifying the Problem
It may happen, sometimes, that a problem prevents the system from working correctly.
In many cases, this depends on trivial causes, simple human faults, which can be easily
discovered and removed, with no need for a specialist intervention.
In other cases, bad functioning is due to more serious human faults or to a system failure,
and the problem solution requires technical intervention.
This chapter describes some common problems, the possible trivial causes and the related
solutions.
Only when you have ensured that the problem is not due to any of the listed causes, you
need technical intervention.
The system itself offers some maintenance tools, available also when the operating system
is not running, which test the system hardware, and perform the fault isolation.
If you are maintaining the system on your own, you can find the description of these tools in
the
Maintenance Guide . This guide is available at your supplier.
The following paragraphs list some of the problems that may occur working with the
system, during either the system power on or its normal operating state. If you encounter
one of these problems, you can try to solve it on your own.
Otherwise, if it is necessary to call the technical support for assistance, remember to read
the system serial number, as this will be requested by the technical support.
The system serial number is written on the rating plate label placed on the rear side of the
unit, as shown in the figure.
Its format is XAN - F xx - nnnnn , where:
F xx is the system run code defined by the manufacturer
nnnnn is the system serial number (5 digits).
Note:
XAN changes into XBH for the systems shipped to Brazil.