AV System Troubleshooting and Maintenance Flashcards
7 cards from real CTS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 AV System Troubleshooting and Maintenance flashcards as text
A projector displays a green tint across the entire image. After confirming the source signal is correct, what is the most likely cause?
Answer: Incorrect white balance or color matrix setting on the projector
An incorrect color matrix or white balance setting on the projector is the most common cause of a full-screen color tint when the source signal checks out.
During a presentation, audio from a wireless microphone cuts out intermittently. The battery is new and signal strength appears strong. What should be checked next?
Answer: Check for RF interference from nearby Wi-Fi or other wireless systems on the same frequency band
RF interference from co-located wireless systems or Wi-Fi networks operating in the same frequency band is a primary cause of dropouts even when signal strength appears adequate.
A touch panel control system is unresponsive after a power outage. The panel shows a solid amber LED. What is the recommended first step?
Answer: Power cycle the control processor and allow it to fully reboot
A solid amber LED on many control panels indicates the processor is offline or initializing; power cycling the control processor is the appropriate first recovery step.
An AV technician notices that a ceiling-mounted speaker produces distorted audio only at higher volume levels. The amplifier clip indicator does not light. What is the most probable cause?
Answer: Loose or damaged speaker cone
Distortion that occurs only at higher SPL without amplifier clipping typically indicates a mechanical issue such as a loose or damaged speaker cone or surround.
A video conferencing system shows the far-end participants with a noticeable lip-sync issue where audio leads video by about 200 ms. What adjustment corrects this?
Answer: Apply audio delay of 200 ms within the AV system's signal processing
When audio leads video, adding an equivalent audio delay through the DSP or AV processor realigns the two streams to correct lip-sync.
A laser projector in a large venue suddenly shuts off mid-presentation and displays an error code indicating a thermal fault. What is the most appropriate immediate action?
Answer: Check and clear any obstructions to the projector's intake and exhaust vents, then allow it to cool
A thermal fault shutdown is caused by overheating, most often due to blocked ventilation; clearing obstructions and allowing the unit to cool before restart is the correct first response.
After installing a new DSP, all audio signals passing through the unit have a consistent 60 Hz hum. What is the most likely cause?
Answer: A ground loop introduced by the DSP's power connection
A consistent 60 Hz hum appearing after adding a new piece of equipment is the classic symptom of a ground loop created by differing ground potentials between devices.