Common faults of digital video camera

The faults of digital cameras can be described as various, and the specific solutions of different models will be slightly different. But to sum up, it is nothing more than the following categories.

1, the image obtained during shooting is not good. This kind of fault can generally be subdivided into three situations. First, the viewfinder and TV display images are not ideal, and the reason for this failure is usually the camera circuit; Second, the viewfinder image is normal and the TV display image is not good. This situation is usually caused by poor AC adapter or line connection; Third, the TV image is normal and the viewfinder image is not good. The fault cause of this situation is usually caused by the viewfinder.

2. The color of the image is unnatural. If the monitor image is normal and the recording tape has five colors or bad colors, generally speaking, the fault occurs in the recording part; Conversely, if the recording tape is normal and the monitor image is abnormal, it is caused by the AC adapter or poor connection. If both are not good, the fault lies in the camera circuit.

3. The image is blurred and the focus is not good. If the manual focus is good, the autofocus is not good, and the fault is generally in the autofocus circuit. If both manual and autofocus are not good, the fault mainly lies in the lens focusing component.

4. The replayed image has no sound. In this case, you can put the recorded tape into an ordinary video recorder to play and monitor the sound effect. If the sound is normal, the fault is in the AC adapter; On the contrary, the fault lies in the recording circuit or microphone and microphone circuit.

5. The whole machine doesn't work. After the machine is turned on, all buttons do not work, the viewfinder has no light, and the box discharging mechanism does not act. This kind of fault is usually caused by abnormal power supply or power supply circuit. First, check whether the battery voltage or the output voltage of the AC AC adapter is normal. If it is normal, the fault lies in the power supply circuit.

6, tape throughput failure. Both the viewfinder and the monitor can display the captured image normally, but the tape cannot be loaded or taken out. This kind of fault usually occurs in the movement and its driving circuit.

Inspection method of digital camera fault

After the fault location is initially determined according to the fault phenomenon, it is necessary to further find the fault point. Due to the complex structure and numerous components of the integrated digital camera, it is impossible to detect faults one by one when searching. To this end, you can use the following methods to search with the help of electronic equipment.

1, comparison method. Compare the normal equipment with the faulty equipment, and then find out the fault. The voltage, current, resistance and waveform of related test points can be compared by using test instruments, and the accurate fault point can be found quickly.

2. substitution method. Borrow parts of normal equipment to replace suspicious parts of faulty equipment, so as to find faults quickly. This method is usually used for circuit boards or connectors that can be easily replaced.

3. Dichotomy. When searching, select a split test point, divide the fault range into two parts, and determine which part of the fault range through this test point. Then choose a split test point from the determined fault range, further divide the fault range into two parts, and further determine the fault range through this test point, and so on, the fault range will be quickly narrowed and the fault point can be found quickly.

4, open circuit and short circuit method. When looking for short-circuit faults, you will often get twice the result with half the effort It should be noted that the open-circuit short-circuit method is not suitable for some circuits, such as power supply circuits and high-voltage circuits.

5. Human body induction method. When looking for faults, the human body, the most convenient noise signal source, is often used to inject noise signals into the test points. This method is simple and quick, but we must pay attention to safety to prevent accidental contact with high pressure points.