Grass Valley CR Series v.3.2 - Manual (Page 128)

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Maintenance
Trouble-Shooting
Power Supply LED Does Not Illuminate
If the device is otherwise functioning properly, the problem is a faulty LED. (Call Grass Valley for
service.) If the router is not functioning at all, take the following steps.
Determine whether the external power supply delivers power. (If you cannot do this, call Grass
Valley.) If it does deliver power, try using the other PS connector. If neither connector works, the
router is “dead.” If one PS connector works and the other doesn’t, the router is defective.
The CRPS1 power supplies from Grass Valley have an indicator lamp. If the indicator lamp is off,
either the power supply is dead or the AC socket is defective or not connected. Try plugging the
power supply into another socket that you know is working. If the power supply’s indicator light
remains off, the power supply is dead. Otherwise, the AC socket was the problem.
Noisy Transitions
Try using a video reference to align video (and audio) transitions with the sync in the video
reference.
Verify that the video reference signal is appropriate for the router, well-formed, and terminated.
 If you use one of the composite analog signals (525 or 625) as a reference for an HD router,
you will probably introduce switching transients. Because SMPTE specifies the switch point
for HD as NTSC line 4, using an SD reference might cause the switch point to occur at the
wrong place in the HD stream. You might see switching transients. (The SD switch point is
specified as NTSC line 10.) Embedded audio will have a noticeable discontinuity.
CQX Routers
The router will switch at the correct point for HD if its ‘Mode’ switch setting is an HD standard.
See
Mode Rotary Switch on page 82 for switch setting details.
For the auxiliary outputs, the video must be aligned to the reference to avoid noisy switches. For
the CQ outputs, the video has only to be within ± 3 lines of the video reference.
 Because of processing delays, a video signal might not line up perfectly with a plant’s timing,
i.e, its reference signal. Aux outputs ignore timing and switches according to the reference.
The 2 CQ outputs, on the other hand, allows a certain amount of delay by accepting the
video within ± 3 lines of the plant reference. The CQX determines how early or late the video
stream is with respect to the video reference, then delays it so that the output video occurs 3
lines after the reference. Doing this allows it to process the video and to perform a clean
switch.
If the video is outside the ± 3-line window, the CQX does not process the video. Instead, it
uses the non-sync bypass (not emergency bypass) to route the video, so that the switch
behaves like an auxiliary output. As with auxiliary outputs, the bypass can result in glitches
in the video and audio, because no processing is being done.
Router Functioning Improperly
If the router gets power, but the router does not transmit signals properly or does not switch
properly, the router has an indeterminate problem. Call Grass Valley.