Crystal Vision
Problem solving
20/09/05
11
DDAA246 User Manual V1.10
4 Problem solving
The front edge of the card provides useful power rail monitoring in addition to card-edge
controls and status LEDs.
DDAA246 front edge view
LED indicator assignments
LED
Colour
Meaning when lit
INPUT A
Green (bottom)
Valid serial digital input detected channel A
ERROR A
Red (top)
Serial digital input lock error channel A
625 A
Yellow (top)
625-line output channel A
525 A
Yellow (bottom)
525-line output channel A
INPUT B
Green (bottom)
Valid serial digital input detected channel B
ERROR B
Red (top)
Serial digital input lock error channel B
625 B
Yellow (top)
625-line output channel B
525 B
Yellow (bottom)
525-line output channel B
PSU
Green (top)
Power supply voltage present
Basic fault finding guide
The +5V/PSU LED is not illuminated
Check that the frame PSU is functioning – refer to the appropriate frame manual for detailed
information
Check that the card is seated correctly in the frame
There is no video output
Check that a valid video input is present and that any cabling is intact
Try using the built-in modulated ramp test signal to check output cabling and monitoring
The video output is low quality
Check that the maximum cable length has not been exceeded
Check the card-edge chroma bandwidth setting
Why can I not have 7.5% IRE setup on one channel and 0% on the other?
The NTSC setup controls act on both channels at once
Why can I not have high chroma bandwidth one channel and low bandwidth on the other?
The chroma bandwidth controls act on both channels at once
I can only see a modulated ramp signal on one or more channels, where's the input video?
Check that the channel's TEST switch is in the UP position to view the input video
