The analysis and maintenance of EARSON multimedia active sound box circuit, TDA2030A contains short circuit protection, thermal protection, ground open circuit |
| Time£º2015-06-08 08:15:02 Source£ºNetwork Author£ºUnknown Clicks£º11043 |
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In maintenance, the power switch on the back of the chassis is placed on the starting state, and the resistance between the two ends of the power plug is measured by using the meter, and the normal value is between 250 -300. If the resistance is infinite, is a power transformer primary open circuit. Suggested replacement for slightly larger power transformer, and in the primary circuit series a 0.5A fuse, conditions in fuse parallel connection behind a pressure-sensitive resistor for protection, avoid mains overvoltage when burned power transformer.T5fservice manual download site
Fault phenomenon 2: silent, light.T5fservice manual download site
Analysis and maintenance of: indicator light that power supply basically normal, should first of all make sure that the computer, DVD and other audio without fault, and then check the active speaker. The silent reasons caused by the multimedia speakers are: one is input, the output socket contact is bad, two is the volume potentiometer, the minimum position is three.. When maintenance will be used in the RX10 block, with oneT5fservice manual download site
Pen is connected to, another pen from the power amplifier circuit TDA2030A of feet, along the audio input line, the intermittent step by step touch connection point, according to whether the speaker a clicking sound, judge fault coverage.T5fservice manual download site
Fault phenomenon 3: a speaker silent.T5fservice manual download site
Analysis and maintenance of: the fault reasons: one is input and output socket connection is bad, or input and output wire breakage, the second is the soundless channel amplifier circuit damage, damage to the track of the speaker. When maintenance can use the method of the input and output plug exchange to determine the fault location. If the speaker plug the speaker, the original silent speaker sound, then the internal power amplifier circuit damage. If the speaker plug is interchangeable, the silent speaker is still silent, the plug connection is the speaker damaged or speaker wire, plug open circuit. If interchange input wires, the original silent channel still silent, it is internal speaker power amplifier or loudspeaker fault; if interchange input wires, the original silent channel into sound, it is computer or DVD audio fault or the sound source to the active speaker socket wire breakage.
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