Grass Valley NV8288 v.1.5 - Manual (Page 70)

60 Rev 1.5 • 24 Sep 09
6. Maintenance
Troubleshooting
Troubleshooting
Many system troubles are caused by easily corrected errors. This section lists common problems
and their solutions in the most likely order of occurrence. Refer to Chapter 2,
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. For contact information, see
Technical Support Contact Information on page iii.
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. If you need to order replacement boards or other compo-
nents, see
Technical Support Contact Information on page iii.
Obtaining Service
For service advice, warranty exchange, warranty repair, or out-of-warranty repair:
1 Call Miranda Customer Support at the telephone number in the front of this manual under the
heading Technical Support Contact Information on page iii. Our Customer Service Personnel
will help you resolve any service issues.
2 If you need an exchange or repair, Miranda will assign you a Return Material Authorization
(RMA) number. Do not return equipment without first receiving an RMA number. Miranda
uses the RMA to track receipt of the equipment and to record repair or replacement informa-
tion.
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 power supply module. See
Fuse Replacement
on page 57.
One or a few cards or
PS6000 modules (i.e., input
card) not powering up or not
operating properly.
Check that the card is fully seated in the frame.
Reset the card 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 power
supply.
Check module fuses. See
Fuse Replacement on page 57.
Intermittent signal on one or
two outputs. Check the input and output cables and cable terminations and verify they are
properly connected.
Check the reference connections and verify that they are properly connected.
Check to make sure that the card is not “bad.” 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 are OK, call Technical Support. (See
page iii.)
Intermittent or missing
signals on all outputs.
Check the quality of the reference signals and their cable connections.
Possible low voltage on PS6000 power supply module. Check power test
points on power supply. Voltages at power supply test points may be slightly
high in lightly loaded systems. Replace the power supply if any test points
indicate low voltage.