In this paper, the power amplifier part with the highest failure rate of the car radio and receiver is combined with the actual measurement and data collection.
1. Special ic of brand machine
Figure 1 is the Japanese pioneer company car audio dedicated amplifier ic pal006a (measured model deh-p3300), the ic uses mosfet output stage, 25-pin single-sided double-row sawtooth package, contains 4 sets of btl power amplifier, maximum power 50wx4. Figure 2 shows the power amplifier stage of the ford xllf-18c870-ed reel made by Alpine for Ford. Ic is philips 70039ab type, 17-pin single-sided dual in-line package, containing 2 sets of btl circuits. It is also used in the Clarion addzest player of Japan Clarion.
2. Widely used ta8210ah~ta8215l series btl stereo ic
As shown in Figure 3, the ta8210ah is a 17-pin single-sided double-row zigzag package, and the ta82l5l is a 17-pin single-in-line type.
3. Mono btl dedicated ic
The mb3730 (single-row, 7-pin in-line type) is commonly used in Toyota vans and some Panasonic retractable machines. The actual model shown in Figure 4 is oyota1806.
4. Other btl dedicated ic (see Figure 5)
Some brands of dedicated 4-channel btl amplifier ic (such as the pal006a in Figure 1, and similar pal005a) are basically the same as the commercial tda7382, interchangeable. In addition, the high-density assembly process of the new car audio (for example, the main board of the "Ford" Ford machine xl1f in Figure 2 is a double-sided double-layered layer with a thickness of 1.8mm, that is, "four-sided copper plate"), which makes the line during maintenance. Follow-up is more difficult. I hope this article is instructive to the readers. Since most of the schematics are based on physical mapping, the mistakes and omissions are expected to be correct.
Shenzhen Chaoran Technology Corp. , https://www.chaoran-remote.com