Miranda NV8256-Plus, Руководство пользователя

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60 Rev 1.3 • 29 Mar 09
6. Maintenance
Troubleshooting
When you insert the new battery, be careful to observe the correct polarity.
Troubleshooting
Many system troubles 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 3 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. For contact information, 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.
Check the AC line fuse on the PS6000 power supply module. See
Fuse
Replacement on page 57.
One or a few cards or
PS6000 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 PS6000 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 PS6000 power supply
module.
Check the PS6000 module and card fuses. See
Fuse Replacement on page 57.
Intermittent signal on
one or two outputs. Check input and output cable continuity and cable terminations.
Possible bad card. 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 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 PS6000 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 PS6000 power supply module if any test points
indicate low voltage.