CST Preventive Maintenance Schedules 2 — Questions and Answers
Question 1: How often should PTZ camera lubrication and mechanical movement checks typically be performed?
- Daily
- Weekly
- Quarterly (Correct answer)
- Every 5 years
Correct answer: Quarterly
PTZ camera mechanical components such as gears and motors should be inspected and lubricated on a quarterly basis to prevent premature wear.
Question 2: Which document should a technician reference to determine the manufacturer-recommended cleaning interval for a camera dome housing?
- Site security policy
- Installation manual or maintenance guide (Correct answer)
- Local fire code
- NEC codebook
Correct answer: Installation manual or maintenance guide
The manufacturer's installation manual or maintenance guide specifies recommended cleaning intervals specific to the equipment model.
Question 3: A maintenance log shows a DVR's hard drive has been in continuous operation for 3 years. What preventive action is most appropriate?
- Ignore it until failure occurs
- Plan for hard drive replacement (Correct answer)
- Increase recording resolution
- Reformat the drive monthly
Correct answer: Plan for hard drive replacement
Hard drives have a finite operational lifespan, and proactive replacement after 3 years of continuous use prevents unexpected recording loss.
Question 4: What is the primary purpose of checking camera IR illuminator output during a preventive maintenance visit?
- To test motion detection sensitivity
- To verify adequate low-light imaging performance (Correct answer)
- To measure cable impedance
- To calibrate frame rate
Correct answer: To verify adequate low-light imaging performance
IR illuminators degrade over time, so verifying output ensures the camera maintains effective night-vision coverage.
Question 5: During a scheduled PM, a technician finds condensation inside an outdoor camera enclosure. What is the correct response?
- Continue the visit and note it in the log only
- Dry the enclosure, inspect for seal failure, and replace gaskets if needed (Correct answer)
- Increase the camera's IR output to compensate
- Replace the entire camera immediately
Correct answer: Dry the enclosure, inspect for seal failure, and replace gaskets if needed
Condensation indicates a compromised seal; drying the unit and replacing failed gaskets prevents moisture damage to internal electronics.
Question 6: Which NVR/DVR maintenance task is best performed during a low-traffic recording period?
- Reviewing camera angles
- Firmware updates and system reboots (Correct answer)
- Cleaning camera lenses
- Testing door contacts
Correct answer: Firmware updates and system reboots
Firmware updates and system reboots briefly interrupt recording, so scheduling them during low-activity periods minimizes potential gaps in coverage.
Question 7: A PM schedule calls for verifying UPS battery backup for surveillance equipment. What is the most important test parameter to check?
- UPS enclosure color
- Battery runtime under load (Correct answer)
- Number of outlets used
- Ambient temperature of the server room only
Correct answer: Battery runtime under load
Battery runtime under load confirms the UPS can sustain surveillance equipment for the required duration during a power outage.
CST Preventive Maintenance Schedules 2
How often should PTZ camera lubrication and mechanical movement checks typically be performed?