Troubleshooting & Maintenance 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 & Maintenance flashcards as text
An HDMI cable run exceeds 25 feet and the image shows signal degradation. What is the most appropriate remedy?
Answer: Install an active HDMI signal booster or fiber optic HDMI extender
Active HDMI signal boosters or fiber optic HDMI cables are designed to maintain signal integrity over long distances beyond passive cable limits.
A video wall shows image tearing where panels meet. What adjustment resolves this issue?
Answer: Synchronizing the refresh rates and enabling bezel correction on the video wall controller
Bezel correction settings on the video wall controller compensate for the physical bezel width so the image appears continuous across all panels.
During routine maintenance, a technician notices that a projector lamp has exceeded its rated hours. What action should be taken?
Answer: Replace the lamp immediately and reset the lamp hour counter in the projector menu
Operating a lamp beyond its rated hours risks sudden failure, reduced color accuracy, and potential damage; replacing it and resetting the counter ensures accurate tracking.
A control system sends commands but the controlled device does not respond. After confirming the cable is good, what should be checked next?
Answer: The baud rate, data bits, and parity settings between the control system and device
RS-232 and other serial communication protocols require matching baud rate, data bits, stop bits, and parity settings on both the sending and receiving devices.
An outdoor LED display shows hot spots (brighter areas) on portions of the screen. What is a probable cause?
Answer: Failed or degraded LED modules or driver circuits in those areas
Hot spots on LED displays typically indicate failing LED modules or driver ICs that are operating outside normal parameters.
What does an PoE (Power over Ethernet) injector allow an installer to do?
Answer: Power a network device through the Ethernet cable, eliminating a separate power supply
A PoE injector adds power to an Ethernet cable, allowing compliant devices like IP cameras and digital signage players to receive both data and power from a single cable.
After a power outage, a digital signage system does not automatically restart. What feature should be enabled to address this?
Answer: 'Power on after power loss' or 'AC power recovery' setting in the device's BIOS/firmware
The 'Power on after power loss' BIOS/firmware setting instructs the device to automatically power up when AC power is restored after an outage.