擴音機有問題，喇叭出現爆音

lamhoifung

有三個問題，想請教各位師兄。THX.
1,部AMP扭大細聲制時，右邊喇叭有雜音？
2，開機和關機，右邊喇叭會''仆''—聲？
3,有時聽聽下歌右邊喇叭又會''仆''—聲？
左右喇叭調轉test過，應該唔關喇叭事。之前未出現上述問題，係呢個月先後出現1>3>2問題。
上述問題係AMP邊part出問題？可否自己維修？

fannyparkman

胆机?

billymud

1,部AMP扭大細聲制時，右邊喇叭有雜音>>possibly, volume control problem.  need be replaced.
2，開機和關機，右邊喇叭會''仆''—聲>>check the speaker protection module.  reset the delay time. (remark: some 胆机 doesn't equipped with the module. )
3,有時聽聽下歌右邊喇叭又會''仆''—聲>>capactor problem or volume control problem.
左右喇叭調轉test過，應該唔關喇叭事。之前未出現上述問題，係呢個月先後出現1>3>2問題>> possibly, component aging problem.
上述問題係AMP邊part出問題？可否自己維修？>> certainly, DIY-able, as commented !

lamhoifung

billymud 發表於 2014-3-30 05:18
1,部AMP扭大細聲制時，右邊喇叭有雜音>>possibly, volume control problem.  need be replaced.
2，開機和 ...

已經換咗電位器和繼電器，問題依舊。AMP:cec amp-3800

billymud

lamhoifung 發表於 2014-3-30 06:12
已經換咗電位器和繼電器，問題依舊。AMP:cec amp-3800

this one ?


換咗繼電器，"'仆''—聲" 問題依舊, is the new relay activiated properly? ，"'仆聲" only happen randomly at R channel?
換咗電位器，"雜音 " 問題依舊, if "雜音 " only happen when u 扭大細聲, replace the Volume電位器 with a new one.  
Otherwise, probably a tunning issue (ie. component thermo-shift) existed in this Class-A pwr-amp section.

good luck with ur DIY.

lamhoifung

換咗繼電器，"'仆''—聲" 問題依舊, is the new relay activiated properly? ，
YES
"'仆聲" only happen randomly at R channel?
換咗新電位器後，變咗左聲道有問題，右聲道又無事。
換咗電位器，"雜音 " 問題依舊, if "雜音 " only happen when u 扭大細聲, replace the Volume電位器 with a new one.  
測試兩個全新都係有輕微雜音，比舊的好好多了。
Otherwise, probably a tunning issue (ie. component thermo-shift) existed in this Class-A pwr-amp section.
我懷疑開关制有問題。

Glock18C

隻牛回壓有問題