ER2801 multimedia has source speaker fault overhaul ideas overhaul the speaker circuit Shi, a is detection power powered of +16V and-16V whether normal, if not normal, is fault in mains entered and rectifier filtering circuit; II is check amplifier circuit TDA2030A of each feet voltage, the IC used plus or minus power powered Shi, entered end ①, and II feet and output end II feet voltage normal voltage are for 0V around, if output end II feet output end voltage not for 0V, please quickly shut machine, avoid burned speakers. Cheap speaker test machine is recommended for maintenance, to avoid losses. Dozens of ohm 5W resistor may be used for maintenance instead of speakers, amplifier circuit board repaired, confirm TDA2030A black-footed or speaker outlet voltage is 0V, then try connecting the speakers.BfPservice manual download site
"Hint," If TDA2030A takes a single power supply. The power supply +24V power supply is generally used, normal voltage of the feet as follows: ⑤ foot power supply for 24V, black-foot output for 12V, II the feet reversed-phase input to 12V, ① foot signal input to 12V.BfPservice manual download site