Revo REXN540-1 - Manual (Page 14)

8
The objective of back focusing a zoom lens is similar to that of a fixed focal length camera
except the back focus is also adjusted to maintain the focus when "zooming" the lens in and
out on a scene.
1. Choose an object at the farthest range set for viewing with a zoom lens.
2. Make sure the iris of the lens is wide open. Do this by adjusting the camera
at night or use a welders glass in front of the lens.
3. Adjust the focus to the stop on the far range.
4. Adjust the zoom on the lens to obtain the widest picture.
5. Loosen the focus adjusting fixing screw.
6. Adjust the back focus ring for the clearest picture.
7. Tighten the focus adjusting fixing screw.
8. Adjust the zoom on the lens to the far telephoto position.
9. Adjust the back focus ring for the clearest picture.
10. Adjust the zoom on the lens back to the widest picture.
11. Loosen the focus adjusting fixing screw.
12. Re-adjust the back focus for the clearest picture.
13. Tighten the focus adjusting fixing screw.
14. Repeat the previous steps as necessary to maintain a clear picture.
Throughout the entire zoom range.
ZOOM LENS BACK FOCUS ADJUSTMENT
TROUBLESHOOTING AND MAINTENANCE
If problems occur, verify the installation of the camera with the instructions in this manual and
with other operating equipment. Isolate the problem to the specific piece of equipment in the
system and refer to the equipment manual for further information.
PROBLEM AREA TO CHECK
No video 1. Verify power is applied to all pieces of the equipment in the system.
The camera LED should be ON.
2. Verity that the video cables are connected correctly.
3. Verity that the lens cap has been removed from the lens and the iris
of the lens is open.
PREVENTIVE MAINTENANCE
Preventive maintenance allows detection and correction of minor that faults before they
become serious and cause equipment failure.
Every three-month, perform the following maintenance.
1. Inspect all connection cables for deterioration or other damage.
2. Clean components with a clean damp cloth.
3. Verify that all the mounting hardware is secure.
TROUBLESHOOTING
Video but no control Power down the system for one minute then re-apply power.
Dark Video
1. Adjust iris. 2. Check A/I connections.