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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

  1. A newly installed HDMI display shows a 'No Signal' error but the source device is powered on. What is the FIRST step to diagnose?

    Answer: Verify the display input source matches the connected port

    Mismatched input source selection is the most common cause of 'No Signal' errors before any hardware is replaced.

  2. An amplifier produces a loud 60 Hz hum only when audio cables are connected. What is the most likely cause?

    Answer: A ground loop between components

    A 60 Hz hum introduced when connecting audio cables is the classic symptom of a ground loop caused by differing ground potentials between components.

  3. A touchscreen panel is unresponsive in one corner only. After a reboot the issue persists. What should be checked next?

    Answer: Inspect the touchscreen ribbon cable for damage or loose connection

    Localized touch failure that survives a reboot typically points to a physical ribbon cable fault rather than a software issue.

  4. A motorized projection screen stops halfway during extension. The motor runs briefly then stops. What is the most probable fault?

    Answer: Thermal overload protection tripping due to mechanical binding

    Thermal cutoff triggering mid-travel indicates the motor is drawing excess current due to mechanical binding or obstruction.

  5. After running Cat6 cable through conduit, a network switch port shows an amber link light instead of green. What does this indicate?

    Answer: The port is operating at 10/100 Mbps instead of Gigabit

    On most managed switches, amber link light signals a 10/100 Mbps connection, meaning the cable or NIC cannot negotiate Gigabit speed.

  6. A control system sends commands to a projector via RS-232 but the projector does not respond. The cable tests pass. What should be verified?

    Answer: Baud rate, data bits, stop bits, and parity settings match on both ends

    RS-232 communication requires identical serial parameters (baud rate, data bits, stop bits, parity) on both the controller and the controlled device.

  7. A rack-mounted UPS beeps continuously and displays a battery fault LED. The UPS is only 6 months old. What is the most likely cause?

    Answer: A failed or deeply discharged internal battery

    Continuous beeping with a battery fault indicator typically means the internal battery has failed or discharged below the UPS's acceptable threshold.