测N101-M61266解码块供电正常。测V901行推动管Ub电压不稳定,怀疑行振荡电路不良。更换4.43MHz晶振后,故障机修到这里,终于修好值得探讨。。该机为三菱贴片IC,4.4.3MHz晶振为JA18B型,不可用JA18A型代换。 |
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