Common fault analysis of electrical remote control (with circuit diagram)

Photocoupler

TVs, VCDs, DVDs, amplifiers, and air conditioners all use remote controls, which can be damaged during use. Now, the resources are abundant, buy a remote control lO yuan or so, but the original remote control regardless of the line, components or production process far exceeds the rear matching products, so many fans are still willing to repair the damaged remote control use.

To open the front and rear covers of the remote control, you will encounter several types of side buckles, a common one. The thin side of the upper cover has a recessed side buckle, and the lower cover corresponds to a raised side buckle. To open the remote control, insert a slightly thick straight blade into the side seam, gently pry open a slit, and use a plastic pad or cardboard strip to insert the slit that has been opened and slide forward. The thin side of the upper cover can be disengaged. It is not difficult to open the other side in the same way. There is a side button of the lower cover of the remote control box which is made into a small buckle and is very thin. Care should be taken when opening the remote control box of this construction. Some remote controls are now stylish, such as bow-shaped, often rounded at the front end, with a side buckle inside, which can be opened by the above method. However, the back end of the remote control is not very good. The bow of the remote control should be buckled on the table, and the lower cover should be pushed forward to open.

The author used a discarded accumulator housing, using the original components and printed board, and made a tester for repairing the remote control (see the drawing) with reference to the information in the magazine. When it received the signal from the remote control, it would Tweet and illuminate at the same time. In addition, with the multimeter current block string in the remote source power supply DC source, as a detection aid, the repair and detection process is much simpler, with this small instrument retested overhauled remote control, the repair rate is almost zero. Let's talk about the experience of repairing the remote control with this small instrument.