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cai dian zi dong sou suo shi suo gu zhang jian xiu
Author(s): 
Pages: 29
Year: Issue:  3
Journal: Family Electronics

Keyword:  失锁主要表现检修方法自动搜台调谐电压高频头频段自动搜索接口电路手动;
Abstract: <正> 节目失锁故障在遥控彩电中比较常见。其主要表现是:按下自动搜索键,屏幕上各频段的节目都能出现,但节目不能锁定在荧屏上。本文给出两例搜台失锁故障的检修方法,供大家参考。例1:一台熊猫3608A型彩电自动搜索失锁。但手动谓台正常,这说明CPU(M491B)能给高频头提供正常的频段切换和调谐电压。该机出现失锁,故障多发生在AFT电路(见图1)。自动搜台开始后,CPU第⑤脚
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