ER2801 multimedia active speaker mute led does not light repair this fault is caused by the power transformer primary circuit. This accounted for more than half of the speakers fault, the reason, a power transformer is of poor quality and insufficient power reserves; second, no fuses and mains input overvoltage protection components, when the mains voltage rises, the transformer burned down; the third is power amplifier circuit short-circuit fault occurs, the current surge, a transformer burned out.HaLservice manual download site
Repairs, first attach the rear power switch is in the on State, blocking power plugs at both ends of the resistance measurement with multimeter, normal values between 250~300. If the resistance is infinite, then the power transformer primary is open circuit, proposed to replace larger power transformers, series a 0.5A fuse in the primary circuit, conditional is behind the fuse a varistor in parallel as a protection to avoid burned power transformer voltage pressure.HaLservice manual download site