Ericsson AVP 4000, Reference Manual, Page: 330 / 422

Preventive Maintenance and Fault-finding
8-10 1/1553-FGC 101 1790 Uen Y
Caution!
Do not remove the top cover of this equipment as this may invalidate any
warranties. Unauthorised maintenance or the use of non-approved replacements
may affect the equipment specification and invalidate any warranties.
This Reference Guide does not include any maintenance information or procedures
that would require the removal of the top cover.
If the following information fails to clear the abnormal condition, call a Service
Engineer or contact Customer Services using the information given in the
preliminary pages of this Reference Guide.
8.5.2 Preliminary Checks
Always investigate the failure symptoms fully, prior to taking remedial action. Fault
diagnosis for the equipment operator is limited to the following tasks, since the
operator should NOT remove the top cover of the equipment:
1. Check the front panel alarm/status LED. If this is not lit:
a Confirm that the power switch is turned on (I). See
Chapter 1, Introduction
for location of the power switch.
b Replace the fuse in the power connector at the rear panel.
Note: Only replace the fuse once. If it blows again contact Ericsson Customer
Services.
c Replace external equipment, power source and cables by substitution to
check their performance.
2. Confirm that the equipment hardware configuration is suitable for the purpose
and has been correctly installed and connected (see
Chapter 2, Installing the
Equipment
).
3. Confirm that inappropriate operator action is not causing the problem, and that
the equipment software set-up is capable of performing the task being asked of
it. If the validity of the configuration, set-up or operation is in doubt, check it (see
Chapter 3, Getting Started ).
4. Check that the fans are unobstructed and working correctly.
When the failure condition has been fully investigated, and the symptoms are
known, proceed with fault-finding according to the observed symptoms. If the fault
persists, and cannot be rectified using the instructions given in this Reference
Guide, contact Customer Services. Switch off the equipment if it becomes unusable,
or to protect it from further damage.