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[#61] etsang3 修理 Marantz 分享    

圖文並茂, 多謝你 etsang3 兄.


rcwy
個人訊息 正式會員
221.xxx.xxx.225
2008-10-04 09:10
[#62] etsang3 修理 Marantz 分享    
Hi etsang3兄,

實在是一位難得的HIFi醫生, 本人從不懂電子為何物, 但真的喜歡一些年事已高的器材(補回少年時買不下來的遺憾), 但他們往往都有問題, 若本人像樓主一樣有這樣的維修奶O, 幸福不少
smartone1228
個人訊息 會員
123.xxx.xxx.101
2008-10-04 09:42
[#63] etsang3 修理 Marantz 分享    
Hi etsang3 hing,

"火牛到底板有供電線斷左(咁都出到聲?)"
I really don't know why still have sound!!

Thanks a lot for your HI FI Doctor to check on all
parts...cleaning, fixing, repairing etc.......
Hoping the work done will not cause you too much
troubles.

Thanks again

magicear
個人訊息 會員
218.xxx.xxx.248
2008-10-04 10:47
[#64] etsang3 修理 Marantz 分享    
etsang3 兄

我有d個人心得唔知有無用, 如果舊膠開始硬化無咁有彈性, 又或者個裂口比較受力的話, 可以切一塊細少的樹膠片, 以混合膠補上去作為強化, 呢個方法甚至試過用係大眼乾衣機隻門個彈力扣都頂得順架.



211
個人訊息 會員
125.xxx.xxx.236
2008-10-04 12:16
[#65] etsang3 修理 Marantz 分享    
多謝各位前輩分享, 衹係睇都有D興奮,

THANKS A LOT
taztoto
個人訊息 正式會員
203.xxx.xxx.113
2008-10-04 13:16
[#66] etsang3 修理 Marantz 分享    
etsang3 hing,

Thanks a lot for your efforts and experience.
You did a good job.
dy111
個人訊息 會員
218.xxx.xxx.248
2008-10-04 14:21
[#67] etsang3 修理 Marantz 分享    
211兄
GOOD !! 以混合膠補上去作為強化
自已都無林到, 又簡單又好,
謝你211兄
hkmk
個人訊息 會員
58.xxx.xxx.82
2008-10-04 19:07
[#68] etsang3 修理 Marantz 分享    
etsang3 si-fu,

Just find that when playing a few particular CD's, my Sansui AU9900 gets some distortion (拆 聲) at high loudness level points. However, most of the time, it just sings sweetly and normally.

I've checked, as you have suggested, that the amp is warm when idle for about 15min. Any idea what possibly causes the problem?
SoundOfMusic
個人訊息 會員
202.xxx.xxx.150
2008-10-05 14:50
[#69] etsang3 修理 Marantz 分享    
用什麼東西洗面板,可以甘乾凈?
calvin1800
個人訊息 正式會員
221.xxx.xxx.170
2008-10-05 18:07
[#70] etsang3 修理 Marantz 分享    
211兄,師傅教我,膠爆左,要從新"啤過"先夠力喎。
嘩!做個公模"啤過"咩!"啤過"意思係從新溶化D膠使裂口再融合埋一齊,不過大爆口用辣雞辣得太耐一般妘ㄦ|縮,所以要加膠辣,要用雙同膠料(475,ABS)或可能要雙同顏色添,否則不能融埋一齊。辣完一舊舊就用苳M或沙紙做後期工作,手術高明,整完連裂過都睇唔到。
點知係乜膠料? 師傅教我燒(辣)膠料聞下,唔同膠料有自己獨特味道。
去邊度搵膠料? 我成日行街見到D塑膠垃圾,清潔,顏色特別,都會整碎帶些少返屋企,以備不時之需。(哈哈,正垃圾佬一名)
etsang3
個人訊息 會員
219.xxx.xxx.148
2008-10-06 01:49
[#71] etsang3 修理 Marantz 分享    
SoundOfMusic hing. I think it is due to bad contact or aging inside the amp. There are Noise Problem fixing report on the web. There are so many parts need be replaced. Terrible. I have 2 power amps fixing now. If you still want me to help to repair and you can wait. Pls PM me la.

Thanks.

換電容
http://amp8.com/sansui/au555-20000/jpeg/au990031l.jpg
換漏電原子粒
http://amp8.com/sansui/au555-20000/jpeg/au990031t.jpg

(網站: http://amp8.com/sansui/au555-20000/au9900-4.htm)
etsang3
個人訊息 會員
219.xxx.xxx.148
2008-10-06 01:53
[#72] etsang3 修理 Marantz 分享    
Calvin1800 hing,
用什麼東西洗面板,可以甘乾凈?

我用開稀 KLEEN (百佳買,1:3),要徹底過水乾淨,唔係日後面板會"發白"
etsang3
個人訊息 會員
219.xxx.xxx.148
2008-10-06 01:59
[#73] etsang3 修理 Marantz 分享    
Thanks, etsang3 si-fu. Pls check pm.
SoundOfMusic
個人訊息 會員
61.xxx.xxx.249
2008-10-07 12:51
[#74] etsang3 修理好聲"山水"機一部    
HI etang3 hing

I found my old NAD amp give distortion sound in both channels, and the display flash when plug-in power. Would this the cause of drying out of the reservior cap? Or any area I should noticed?

THX in advance.
wo
個人訊息 會員
58.xxx.xxx.186
2008-10-12 02:50
[#75] etsang3 修理好聲"山水"機一部    
Wo hing, for NAD amplifier, failure of FilterCap may be the cause of the, Change-over power supply (when the music louder , the signal switch on another power supply of to supply higher voltage to output stage.
Also, malfunction of "Soft-Clip" circuit may also cause distortion. Try switch soft-clip ON and OFF to compare the sound.
etsang3
個人訊息 會員
218.xxx.xxx.82
2008-10-12 11:21
[#76] etsang3 修理好聲"山水"機一部    
Good morning etsang3 hing

Great Hint!!

almost forgot the "soft clip" circuit.

I suspect 10000uF filter cap but it look perfect, no sign of leak or swell, try switch off the soft clip and replace filter cap first.

THX
wo
個人訊息 會員
219.xxx.xxx.157
2008-10-12 12:48
[#77] etsang3 修理好聲"山水"機一部    
After unplug the NAD amp for a week, without replace any parts. Sound come normal and nice again, strange!! Problem of reley??
wo
個人訊息 會員
219.xxx.xxx.22
2008-10-25 10:19
[#78] etsang3 修理好聲"山水"機一部    
Wo hing, please check (LOOK) from this direction for parts condition and soldering.
Power Plug -> power cord -> power cable clip entry hole -> power switch of amplifier -> power fuse holder -> transformer wire soldering ->rectifier -> Big filtering cap soldering and connectors to the power amp PCB.
I am afraid the problem will only happen when the current flow is prolonged and that problem point is heated up.
Also, please try to knock on the amp without playing a music to see if there is any abnormal noise.
etsang3
個人訊息 會員
202.xxx.xxx.193
2008-10-27 13:25
[#79] etsang3 修理好聲"山水"機一部    
estang3兄 請問你以前講的safetycable燈泡要用多少W呢?thanks
devilangel
個人訊息 會員
218.xxx.xxx.178
2008-10-29 12:06
[#80] etsang3 修理好聲"山水"機一部    
devilangel hing,

前級50W,後級100W啦。應該OK。
etsang3
個人訊息 會員
202.xxx.xxx.193
2008-10-29 19:31
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