Professional power amplifiers generally refers to pure final stage power amplifier, pure power, more widely used, generally in professional power amplifier is used in high power applications, professional power amplifier brand more, amplifier maintenance difficulties and costs are relatively high.DYTservice manual download site
DYTservice manual download site
Domestic brands have a Lake, Octopus, teem, iron triangle, foreign stage power amplifier brands such as aodibeisi, PhD, Ma special, BEHRINGER, Pies, Lectra, JBL, ADCOM love piano, Yamaha, in control, AKG, very much. But its structure uses pretty much the same. Chongqing into a repair professional repair imported brand pure power Conference room, stage amplifiers, amp technical services unit, unity maintenance telephone 4000, 666, 284.DYTservice manual download site
Audiobasik aodibeisi pai300 professional power amplifier without maintenance: a case reportDYTservice manual download site
Symptom: power on indicator lights, fans can go, there is no sound output.DYTservice manual download site
DYTservice manual download site
Amplifier repair procedures: disassemble after the first observation of structure of the amplifier, this is a pure final stage power amplifier, the left and right channels with three pairs of 5200/1943 as the final amplifier tube, its power can be seen. Rectifier and filter plate placed next to the transformer separately, the structure is very clear. Measure the filtered output voltage ± 60 v normal measuring amplifier tube collector of 5200/1943 plus or minus 60 volts respectively, the base voltage of plus or minus 0.6 volts, emitter output level is 0, indicating power amplifier Board is working correctly, where observation did not smoke or burnt black.DYTservice manual download site
DYTservice manual download site
Access to signal tracking trends, found this machine there is a 4558-grade operational amplifier circuits, signal input and no output, measuring amplifiers operating voltages plus or minus 15 Volts No 15 Volt, trace the origin of voltage Zener diode Circuit found, from 60 volts using resistive voltage divider, the voltage regulator, and replaced components to test the machine sounds OK.

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