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例5 故障现象:图像淡薄且背景嵌有浓密的“雪花”,遥控或手动微调也不起作用。分析与检修:索尼G3F高频调谐器TU101(BT—RG422)内部有三组独立的高频放大器,采用具有反向AGC特性的双栅场效应管,三路独立的本机振荡器和混频器集成在专用谐调芯片TDA5631内。它的性能优良,能够复盖世界各国所有广播电视和有线电视节目(总共接收100个台位频道)。剖析其内部结构,能够同时造成VHF—L、VHF—H、UHF三个频段三路电视信
Example 5 Symptom: The image is light and the background is embedded with a thick “snowflake”, remote or manual fine tuning does not work. Analysis and Overhaul: The Sony G3F High Frequency Tuner TU101 (BT-RG422) has three independent high-frequency amplifiers in its interior, dual-gate FETs with inverted AGC features, three independent local oscillators and mixers Integrated in the special tuning chip TDA5631. It performs well and can cover all broadcast and cable programming in all countries of the world (receiving a total of 100 channel channels). Analysis of its internal structure, can simultaneously create three VHF-L, VHF-H, UHF three-channel television signal