Amplifier front panel operating at low voltage, small signal condition, "faults" are pretty low. Amplifier Board is different, it works, to the impact of high dynamic current, "faults" tend to have higher chance, when coupled with the design of the power amplifier, in order to get the ideal frequency response and high common-mode rejection ratio, extensive use of direct-coupled circuit, connected at all levels, giving judgment "failed" range has brought a lot of inconvenience. Here introduces readers to two kinds of repair, special methods of the AV amplifier, or "contrast overhaul method" and "fuzzy overhaul. Both of these methods is easy to learn, particularly adapted for beginners.Lmqservice manual download site
Lmqservice manual download site
1. Compare repair, (referred to as comparative method)Lmqservice manual download site
Lmqservice manual download site
What is comparative repair, as we all know, amplifier includes two-channel, two-channel circuit structure is exactly the same, independent of each other, of corresponding components on the circuit board on the resistance and voltage were almost the same. In this way, when a normal while another channel appears "failed", it can be estimated by measuring the "failure"-channel component zuzhi resistance or voltage value, corresponding to the normal channel of components compared to find out "fault". When you use this method, requested information on the overall layout of the circuit, separating element belongs to the channel, and can find a correspondence between two components.Lmqservice manual download site
Lmqservice manual download site
2. Fuzzy inspection, (referred to as fuzzy method)Lmqservice manual download site
Lmqservice manual download site
So-called fuzzy overhaul refers to do not quite understand the structure and working principle of case zuzhi resistance measurements directly on the circuit board components to locate the "failure." This method should pay attention to the following three points:Lmqservice manual download site
Lmqservice manual download site
First, the measurement should be based on semiconductor components, after the resistance and capacitance of the order. Because practice showed that semiconductor component failure rate highest, followed by the resistance (particularly the great resistance of the current area) and is the capacitance.

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