Maintenance and Troubleshooting Flashcards

A technician uses a field monitor and finds that a camera produces a black-and-white image in daylight conditions. The most likely cause is:

Answer: The IR cut filter is stuck in the nighttime position

When the IR cut filter stays in its nighttime (removed) position during the day, infrared light desaturates the image, producing a black-and-white or washed-out appearance.

What is the purpose of re-torquing conduit fittings during a surveillance system maintenance inspection?

Answer: To ensure weathertight seals and prevent moisture ingress

Conduit fittings can loosen over time due to thermal expansion and vibration; re-torquing ensures weathertight seals that keep moisture and pests out of cable runs.

An installer notices that an IP camera's latency increases significantly during peak business hours. What is the most appropriate corrective action?

Answer: Implement QoS policies on the network switches to prioritize video traffic

QoS (Quality of Service) prioritizes surveillance video traffic over lower-priority data, reducing latency during periods of network congestion.

After replacing a camera, the NVR records the new camera's footage under the old camera's channel name and settings. What step was likely skipped?

Answer: Reconfiguring the channel settings and camera profile on the NVR

When a camera is replaced, the NVR channel must be reconfigured to match the new camera's IP address, resolution, and other parameters.

A wide-area surveillance site experiences multiple camera outages following a thunderstorm. The most important preventive measure for future storms is:

Answer: Adding lightning arrestors and proper grounding to all camera installations

Lightning arrestors and proper earth grounding divert surge energy away from camera electronics, providing essential protection against lightning-induced damage.

When testing a newly repaired PTZ camera, a technician finds that the camera homes to the wrong preset after power cycle. What needs to be adjusted?

Answer: The home preset position and auto-home timer settings

The home preset and auto-home timer must be reprogrammed after repairs or replacement to ensure the camera returns to the correct default position.

Which log source should a technician review first when diagnosing intermittent NVR recording gaps with no apparent hardware fault?

Answer: NVR system event and error logs

NVR system event and error logs record timestamps and error codes for recording interruptions, making them the primary diagnostic resource for unexplained recording gaps.