Pelco TI2550 Troubleshooting

24 C1309M-A (9/08)

Troubleshooting

NOTE: The system contains no user-serviceable parts. If there is a problem with your system, it must be returned to Pelco for servicing.

Occasionally, image quality may degrade.

1. Perform a manual FFC. After manually performing this process, the camera restarts the frequency clock and resets the baseline temperature

(refer to Flat Field Correction on page15).

2. If the problem persists, perform the troubleshooting steps in Symptom: No video or poor video.

1. Check the system input voltage.

2. The TI2500 Series thermal imager is protected by a resettable overcurrent protective device located in the transformer module. Whenever a

fault condition happens in the system causing excessive current flow through the protective device, a chan ge occurs that will prevent

current flow. The protective device remains in this state as long as power is applied and the system fault continues. The protective devic e

resets itself after power has been removed for a few minutes, and then operates normally when the system fault has been repa ired.

3. Check the system power and video BNC connections.

4. Check that a fuse has not blown.

The system is fuse-protected against overvoltage. A blown fuse is an indication that either the circuit has been overloaded or that a short has

occurred somewhere in the circuit. A wiring problem may be placing too much load on the circuit if a fuse blows after plugging in or turning on

the camera. Before replacing the fuse it is important to identify what has caused the failure.

Prior to changing a fuse, turn off the electrical circuit or completely disconnect the camera. Make certain t hat no dangerous conditions exist

before restoring power. Replace the fuse with a 2 A blade fuse (Bussmann® ATM-2 or equivalent). Never use anything other than a fuse of proper

rating.

1. Check the system power and video BNC connections.

2. Check all coaxial BNC connectors from the camera to the monitor.

3. Make sure the controller is set for the correct camera-to-monitor viewing combination; for example, Camera 1 to M onitor 1. Refer to the

controller manual for information.

4. Check for normal load termination of 75 ohms. When looping through VCRs or multiplexers, make sure the signal is terminated at the end

device. Typical termination symptoms and problems are listed below.

When the camera is pointed at a window, it cannot detect activity behind the glass. This is a limitation of thermal imaging technology. Consider

repositioning the camera.

DANGER: Failure to disconnect power to the camera before replacing a fuse could result in accidental injury or death.

Table E. Termination Symptoms and Problems

Symptom Problem

Extremely bright video No termination or high resistance

Over contrast or contrast level of monitor

needs to be increased to maximum for a

good video image

Double termination (37.5 ohms)