影音天地主旨 ﹝請按主旨作出回應﹞  上頁  下頁  首頁  尾頁 寄件者 傳送日期 由舊至新 由新至舊
[#21] Leak ST20 Amp 點樣裝接線    
GZ34第一級電容用40mfd以上係太大了 不在正常使用範圍 對電壓影響反倒可以忽略
-----
any reason why? the spec say max C is 60u
Not-So-GoodSamaritan
個人訊息 會員
118.xxx.xxx.42
2013-03-22 14:40
[#22] Leak ST20 Amp 點樣裝接線    
Not-So-Good hing

我自己之前有一部ST-20粒原庒大水塘有問題,後來換了Jensen 47uf+47uf電容,一check高壓發覺比原來高出十幾廿Volts,當時找唔到新裝電容有岩uf數,都聽了很耐,後來M cap 出咗32+32uf才換回。

n19137
個人訊息 會員
218.xxx.xxx.115
2013-03-22 14:48
[#23] Leak ST20 Amp 點樣裝接線    
我自己之前有一部ST-20粒原庒大水塘有問題,後來換了Jensen 47uf+47uf電容,一check高壓發覺比原來高出十幾廿Volts,當時找唔到新裝電容有岩uf數,都聽了很耐,後來M cap 出咗32+32uf才換回。
-----------
are you comparing the schematic from leak or from the old cap? according to the schematic, the trans draws about 160ma. the voltage after the rectifer is 334v assuming the trans output 300v. so what voltage did you get?

最後修改時間: 2013-03-22 15:09:49
Not-So-GoodSamaritan
個人訊息 會員
118.xxx.xxx.42
2013-03-22 15:09
[#24] Leak ST20 Amp 點樣裝接線    
Yes, I compare with the schematic from Leak, Not compare with my original Cap that is a problem Cap.

The First reservoir capacitor, as Jensen 47uf used have 348 Volts, as I change back to Mcap 32uf drop down to 330 Volts.
n19137
個人訊息 會員
218.xxx.xxx.115
2013-03-22 15:51
[#25] Leak ST20 Amp 點樣裝接線    
The First reservoir capacitor, as Jensen 47uf used have 348 Volts, as I change back to Mcap 32uf drop down to 330 Volts.
-----
o.k. that's kind of strange. there is probably some difference between the caps. i did a number of simulations on the circuit. the voltage change is rather small changing from 32uf to 47uf. even with that change, it is not going to change the circuit behaviour that much. the mains variation is more than that already.
Not-So-GoodSamaritan
個人訊息 會員
118.xxx.xxx.42
2013-03-22 16:04
[#26] Leak ST20 Amp 點樣裝接線    
N19137, 32uF or 46uF may not be the only reason of the concerned 1?v difference, e.g. cap spec other than 32/46 uF, a/c difference when measuring the voltage, so on. It is easy to prove it, simply parallel a cap and compare the measured voltage.
waterman
個人訊息 正式會員
210.xxx.xxx.1
2013-03-22 20:35
[#27] Leak ST20 Amp 點樣裝接線    
I just toke few minutes to do an experiment. Here below are two photos showing one single 10uF cap at the first stage and two 10uF caps in parallel , and readings are the same - 409V.





最後修改時間: 2013-03-22 21:10:26
waterman
個人訊息 正式會員
210.xxx.xxx.1
2013-03-22 21:08
[#28] Leak ST20 Amp 點樣裝接線    
it is better to hook a scope to it. since it is not sine wave, you might not know how accurate your volt meter is in measuring the voltage which is not pure dc.
Not-So-GoodSamaritan
個人訊息 會員
14.xxx.xxx.67
2013-03-22 22:19
[#29] Leak ST20 Amp 點樣裝接線    
King, I also measured two operations by using meter with very limited scope function and found their ac voltage are both ~11v. It is not very accurate, but I can see no big difference when comparing two operations.
waterman
個人訊息 正式會員
210.xxx.xxx.1
2013-03-22 22:47
[#30] Leak ST20 Amp 點樣裝接線    
are you measuring a st20? if you are , i think your power transformer is very different from the original. with the original, i don't think you can get that voltage reading.
Not-So-GoodSamaritan
個人訊息 會員
14.xxx.xxx.67
2013-03-22 23:23
[#31] Leak ST20 Amp 點樣裝接線    
It is not a st20. Maybe st20 owners can have a try.
waterman
個人訊息 正式會員
210.xxx.xxx.1
2013-03-23 00:25
[#32] Leak ST20 Amp 點樣裝接線    
It is not a st20. Maybe st20 owners can have a try.
-------
that would be very different then.
Not-So-GoodSamaritan
個人訊息 會員
14.xxx.xxx.67
2013-03-23 00:31
[#33] Leak ST20 Amp 點樣裝接線    
多謝多位意見 但套机仲係大細声 開機約十五分鈡後有hum聲 請問点樣檢查各電容及電阻是否正常呢? 上網找到 ST20 的資料 話会容易漏wax及燒火牛 未知点样確定正常步驟 搞到我吾咁再開机 請提供意見 thanks. (机背相片又upload 吾到 救命吖)
joellee888
個人訊息 會員
86.xxx.xxx.138
2013-03-23 01:39
[#34] Leak ST20 Amp 點樣裝接線    
Black Gate " Heart of Muse " 220uf + 220uf 350V WKZ 換上我首架 LEAK ST 20 聲到現
在已 12年 ,乜問題都無 ,今時今日都好好聲 .

philiplee
個人訊息 會員
86.xxx.xxx.208
2013-03-23 07:59
[#35] Leak ST20 Amp 點樣裝接線    
各位師兄 搜集咗D數據 不過吾知係乜東東? 係咪D電容電阻如有損壞就要更換呢? 全部定部份呢? 請問有边本書教授維修自學呢? 買咗支meter 學緊点用 請指教! 還有一問 D零件在边處買呢? thanks.

joellee888
個人訊息 會員
86.xxx.xxx.121
2013-03-23 09:19
[#36] Leak ST20 Amp 點樣裝接線    
ST20

joellee888
個人訊息 會員
86.xxx.xxx.121
2013-03-23 09:20
[#37] Leak ST20 Amp 點樣裝接線    
呢兩日參巧咗 R33 的舊資料,佩服各位師兄 尤其Pilotrol兄 rcwy兄 philiplee兄 dd845兄 對Leak 的認識. 仲有Ginger兄D收藏, 獲益良多 thanks again.
joellee888
個人訊息 會員
86.xxx.xxx.121
2013-03-23 09:34
[#38] Leak ST20 Amp 點樣裝接線    
joellee888 兄

要搞好架機首先揾個師父收理 ,由後級并始 ,換 RCA插輸入 ,

換电容 C3 ,C5 , C8 ,C4 , C6 , C7 = L , R 兩邊 .

換电阻 R 14 , R 15 = L , R 兩邊 = 270 2W .

philiplee
個人訊息 會員
86.xxx.xxx.208
2013-03-23 17:20
[#39] Leak ST20 Amp 點樣裝接線    
hi philiplee兄,謝謝意見 小弟想試試DIY 復修部机 感受下D樂趣 不過真係苦樂參半! 吸收多D電子的知識 你諟及的零件我已上網找到 不知好吾好 你可吾可以代購呢? R33網上見你收藏及修復好多Leak机. 如小弟才 搞吾掂 想你抽空 我帶套机比你檢修一下. thanks again. joel
joellee888
個人訊息 會員
86.xxx.xxx.90
2013-03-23 19:47
[#40] Leak ST20 Amp 點樣裝接線    
joellee888 兄

如果我再香港一定好樂意幫你整機 ,豆令都吾收包零件 ,

無其他 祇是大家玩機玩得并心的 .

philiplee
個人訊息 會員
86.xxx.xxx.208
2013-03-23 22:01
主旨內容一共有 4 頁,每頁顯示 20 個信息,選擇頁數:  上頁  下頁  首頁  尾頁
按照傳送日期顯示:由舊至新由舊至新  由新至舊由新至舊
最新資訊 - 影音
讓音樂神韻盡現 Lehmannaudio 3S Device Feet 2021-03-04

最新資訊 - 影音
SIE 宣布將於八月底中止 PS Store 串流影音 Video 販售及租借服務 2021-03-03

最新資訊 - 影音
延續經典造型,McIntosh 推出全新 MCD85 CD / SACD 唱機 2021-03-02

最新資訊 - 影音
釋出最純淨音質 - OCTAVE Filter 3-P 訊號濾波器 2021-03-02