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机型:三元47SYC—3型彩电故障现象:音量失控,不能调小。分析与检修:该机音量控制电路由两部分组成:一部分是集成块TA7680AP内部的直流电子音量控制电路;另一部分是外围直流电压调节电路,由R_(1023)、R_(305)、C_(307)组成。检查集成块①脚外围元件正常,故判断故障为集成块内部直流电子音量控制电路失效所致。将电路作适当改进,将R_(305)从三元47SYC—3型彩电音量失控,不能调小的故障原因是TA7680AP①脚断开,接到③脚,采用较普通的交流音量控制,电路恢复音量调节,无须成本,效果良好。
Model: Sanyo 47SYC-3-type TV Fault phenomenon: the volume out of control, can not be small. Analysis and Overhaul: The aircraft volume control circuit consists of two parts: one part is the integrated circuit TA7680AP DC electronic volume control circuit; the other part is the peripheral DC voltage regulator circuit, the R_ (1023), R_ (305), C_ )composition. Check the integrated block ① foot peripheral components normal, it is to determine the fault within the integrated block DC electronic volume control circuit failure. The circuit for proper improvement, the R_ (305) from the ternary 47SYC-3-type TV volume control out of control, can not adjust the small fault reason is TA7680AP ① feet open, received ③ feet, the more common AC volume control, the circuit to restore the volume Adjustment, no cost, good effect.