1. Check whether the sixth item above is normal
2. Decoder 24V or 220V power supply port voltage is normal output
3. Directly to the PTZ UP, DOWN, and PTCOM line power supply, check whether the normal work PTZ.
4. Check if the power supply interface is faulty
5. Check the circuit is wrong (old decoder for the UP, DOWN and other lines directly with the PTCOM power supply, the line and the camera and the PTZ lines can be connected directly; some decoder for the independent power supply interface