User guide

Document 920.0090 Rev 3.00 April 16, 2002
16
Solving Common Technical Issues
Call Silent Witness Service Department for additional assistance (see Service for
contact numbers).
No Video
❐ Check that the power supply voltage is within the operating specifications
for your camera model. See Specifications for details.
❐ Connect a video monitor directly to the V25 video output cable to eliminate
video problems that could be caused by other equipment such as video
switches.
❐ Check the video connections to the monitor or CCTV system.
❐ Check the camera connections to the V25 power supply.
Fuzzy Video
❐ Check the video ground connections.
❐ Check for ground loops.
Rolling Picture (Line-Lock Cameras Only)
❐ Adjust the phase as described in Adjusting the Line Lock (Vertical Phase) for 24
VAC Operation.
❐ If the phase cannot be adjusted to prevent picture roll, reverse the power
supply polarity.