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例1 莺歌C51—3—RC彩电,图像正常,无伴音。分析与检修:先检查扬声器和伴音电路IC_(702)(AN5265),发现IC_(702)的④脚电压偏低,参见图1所示。该脚是音量控制端,该脚电压受CPU(IC_(803):M50431—101SP)的(28)脚通过Q_(803)的控制。测IC_(803)的(28)脚电压为0.8V属高电位,使
Example 1 Yingge C51-3-RC color TV, the image is normal, no sound. Analysis and Maintenance: First check the speaker and sound circuit IC_ (702) (AN5265), found IC_ (702) of the ④ pin voltage is low, see Figure 1 shows. This pin is the volume control terminal, this pin voltage is controlled by Q_ (803) of CPU (IC_ (803): M50431-101SP) (28) pin. Test IC_ (803) (28) pin voltage of 0.8V is a high potential