Preventive Maintenance and Fault-finding
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.
8.5.3 Power Supply Problems/Unit Not Working
If the unit Status LED is unlit, fault-find the problem as detailed in Table 8.3.
Table 8.3 Status LED Unlit Fault-finding
Step Action If Result of Action is Yes… If Result of Action is No…
1
Is the LED/LCD display inactive
but the unit still working?
If the unit is clearly working
normally then the LED/LCD
Display itself is probably at
fault. Call a Service Engineer.
Proceed to next step.
2
Check Power Source. Connect
a known-working piece of
equipment to the power source
outlet. Does it work?
The problem lies within the
unit or power cable. Proceed
to next step.
The problem lies with the power
source. Check building circuit
breakers, fuse boxes, etc. If
problem persists, contact the
electricity supplier.
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