104 Rev 2.2 • 27 Mar 10
5. Maintenance
Troubleshooting
When you insert the new battery, be careful to observe the correct polarity.
Troubleshooting
Many system issues are caused by easily corrected errors, such as poor quality or missing input or
reference signals, incorrect configuration, and so on. This section lists common problems and their
solutions in the most likely order of occurrence. Refer also to the Introduction
on page 1 for an
overview of the system and its major components. Try troubleshooting the system yourself, and if
you are not successful, call
Miranda Technical Support as explained near the front of this manual.
In the event that a problem is caused by a bad circuit board, swapping the bad board with a replace-
ment circuit board is the quickest solution. To order replacement boards or other components, con-
tact Miranda technical support. See Technical Support Contact Information on page iii
.
Caution To prevent explosion of the battery and possible equipment damage or harm to
personnel, be sure the battery is oriented with the correct polarity. Polarity mark-
ings are visible on the card’s battery housing.
Symptom Possible Causes and Solutions
System not powering up. Verify that the power cord(s) are plugged into the frame and the AC power
source. Use a voltmeter to verify the presence of power.
One or a few cards or
PS8100 power supply
modules are not powering
up or not operating
properly.
Check that the card or module is fully seated in the frame.
Reset the card or module by reseating it in the frame.
Check that all five green LEDs on the front of the PS8100 power supply
modules are lit. If an LED is not lit, it indicates a branch circuit may be faulty,
which could affect only certain modules in the frame. Replace the PS8100
power supply module.
Intermittent signal on one or
two outputs.
Check input and output cable continuity and cable terminations.
Swap each card in the signal path with another card to see if the problem
moves with the card. If so, replace the card.
If all cables, terminations, and cards check out OK, call Miranda technical
support. (See Technical Support Contact Information on page iii.)
Intermittent or missing
signals on all outputs.
Check the control card, which processes the references to produce sync. A
synchronous system requires an operational control card in order to pass
signals. An asynchronous system will operate in its last state even if the
control card is removed. Change over to the reserve control card to see if the
problem goes away.
Possible low voltage on PS8100 power supply module. Check power test
points on the module. Voltages at power supply test points may be slightly
high in lightly loaded systems. Replace the PS8100 power supply module if
any test points indicate low voltage.
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