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£º11045 |
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Fault phenomenon 4: the volume can not adjust or adjust the volume of noise.7ZQservice manual download site
Analysis and maintenance: the volume can not be adjusted to adjust the volume of open circuit for the volume adjustment. The volume adjustment potentiometer hot open is silent, the voice of the largest and the end open circuit is not adjustable. Adjust the volume when a noise for duplex potentiometer bad contact inside, off the speaker power, repeated several large angle rotation potentiometer can often will potentiometer movable contact of dirt to get rid of, improved, if there is noise, had another new potentiometer.7ZQservice manual download site
Fault phenomenon 5: horn "hum" hum.7ZQservice manual download site
Analysis and maintenance of: the fault reasons: a power rectifier filter capacitor C20, C21 capacity decreases or failure; the second is power amplifier circuit TDA2030A internal short circuit leakage; the third is the left and right channel audio input connection plug wire or shielding layer open, resulting in external electromagnetic interference. Maintenance from outside to inside are examined, disconnect the input plug connection, if the "hum" sound disappeared and is connected to the input plug wire or shield wire breakage; if there is still a "hum" sound, please immediately shut off the power, check the speaker internal power amplifier circuit, because power amplifier circuit TDA2030A internal short circuit breakdown often into DC voltage loudspeaker, loudspeaker burned.7ZQservice manual download site
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