The horn speaker is still widely used in some markets in rural and urban areas. Once the sound film of the horn speaker is lost, it is necessary to ensure the correct installation of the sound film. The following introduces a method that can easily solve this problem. Installation can be performed in two steps.
The first step is to select paper of appropriate thickness and cut two pieces of paper with a width of ~ 10mm and a length 20mm larger than the diameter of the center piece. Then place the two paper strips on the center piece perpendicular to each other (the position should be centered). To prevent them from moving, you can stick them with a little paste. Insert both ends of the paper strip into the magnetic gap. Align the voice coil on the sound film with the magnetic gap and gently press it down. Due to the existence of the paper strip, the position of the voice coil at this time is exactly in the middle of the magnetic gap without being deflected. Measure and apply universal glue on the edge of the sound film, and cover the top of the sound head. Align the screw holes and tighten the screws. And remember the relative position of the upper cover and the sound head in the appropriate position. Leave it for 8 hours. After the universal adhesive is completely dry, you can unscrew the screws and remove the upper cover. At this time, the sound film was stuck on the upper cover.
The second step is to solder the leads to the terminals. Remove the two pieces of paper, and then put the cover back on, paying attention to the mark made originally. At this time, you can use the multimeter R × block or 1.5V dry battery. While constantly touching the two terminals to make a “click” sound, tap the cover to the maximum “click” sound, and there is no friction sound. Gradually tighten the fixing screws. When tightening the screws, they should be tightened alternately, instead of tightening one screw, then tighten the second screw.