#Krell_S_1500_multi_channel_power_amp #首次替一個大功率大規模SMD零件翻新工程 #事前練習搜集資料採購零件及工具都準備十足 #但缺乏實戰經驗下真正施工時才發覺困難重重 近日除了私務繁忙外，餘下時間主要都在為了和這件重磅東西搏鬥，5件模組早已拆除再以萬用錶量度，底板結構仍然堅固及未有劣化跡象，嘗試用多種方法移除所有SMD小功率管，事實這大堆東西，本來可以只用4枚opAmp 便完美取代，可惜Krell的傳統，就是使用多對N，P管以push pull 來突顯矜貴之處，那料這堆東西竟然成為了所有內含SMD輸入stage的催命符，這次一共要翻新兩台Krell , 我早已經購入各種型號SMD半導體每一款5佰個以上，數量上預多了一倍，這是經驗得來，果然是對了，因為，連續換了三件模板同樣出了大問題，每件輸出端都漏出了幾v到廿多v的直流，這絕對不能使用，三塊板的施工都畧有不同之處，當第一塊完成後插入slot試機即時量度出有十多v直流漏出，但不是功放級的問題，平衡放大的輸入端若直流正負電位有差異，那自然無法調整輸出零電位，這情形應該是換入的SMD出問題，我不急於尋找
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