Troubleshooting & Fault Diagnosis Flashcards
7 cards from real CPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Troubleshooting & Fault Diagnosis flashcards as text
A wireless microphone system experiences dropouts only when the presenter moves to one side of the stage. What is the most likely cause?
Answer: RF antenna shadowing or multipath interference in that zone
Dropouts localized to a specific area indicate RF dead zones caused by antenna placement, shadowing, or multipath reflections.
A PoE IP camera powers on but the image is extremely dark even in daylight. What should be investigated first?
Answer: Camera's iris/exposure settings or lens cap still in place
An extremely dark image in adequate lighting is most commonly caused by incorrect exposure settings or a protective lens cover that was not removed.
A digital signage player outputs video but text on screen appears pixelated and blurry. The display is 4K capable. What is the likely cause?
Answer: The player's output resolution is set below the display's native resolution
Pixelation and blur on a 4K display is typically caused by the source device outputting at a lower resolution that the display is scaling up.
After installing a fiber optic cable run, optical power meter readings are 6 dB below the calculated link budget. What fault should be suspected?
Answer: Excessive bend radius violating minimum bend specs or a dirty/damaged connector
A 6 dB loss significantly above the budget points to physical impairment such as tight bends, dirty connectors, or a damaged splice.
A ceiling speaker emits distorted audio at all volume levels, even at very low settings. The amplifier channel tests normal with a different speaker. What is the fault?
Answer: Damaged or torn speaker cone/voice coil
Distortion present even at low levels that is isolated to one speaker indicates a physical defect in that speaker, such as a damaged voice coil or torn cone.
A video conferencing system shows the remote participants with a green tint. Local video appears normal. What should be checked first?
Answer: White balance or color profile settings on the remote camera
A color cast visible only on the remote video feed points to an incorrect white balance or color space setting on the remote site's camera.
An access control reader flashes red and beeps three times when a valid credential is presented. What does this behavior typically indicate?
Answer: The credential is not enrolled in the system or is outside its time schedule
Three red flashes with a beep is a standard reader response for an unrecognized credential or one that falls outside an active access schedule.