review33.com: 影音天地: etsang3 修理好聲"山水"機一部

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[#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 正式會員 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

正式會員
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

正式會員
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??

正式會員
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

正式會員
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

正式會員
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

正式會員
202.xxx.xxx.193

2008-10-29 19:31

[#81] etsang3 修理好聲"山水"機一部
etsang3 兄,
我想問Audio Reserach ぇe Sp6-B 你介唔介意幫我整??
1/Mode selector 個掣鬆鬆地, 有時唱唱下有一僱L.
2/ phono 播放時有一零i si 聲, 喇叭單元向前向後狂郁, 但又有時無事...
THX!

edwardfkw

正式會員
222.xxx.xxx.6

2008-10-29 20:26

[#82] etsang3 修理好聲"山水"機一部
edwardfkw hing,

Please check PM. Thanks

etsang3

正式會員
218.xxx.xxx.251

2008-10-30 00:38

[#83] etsang3 修理好聲"山水"機一部
i cant get your PM
therefore, I send e-mail to you
THX~~

edwardfkw

正式會員
203.xxx.xxx.36

2008-10-30 19:48

[#84] etsang3 修理好聲"山水"機一部
I got an amplifier, 110v, want to make it 220v, how much please. Please PM. Thanks.

bbqiller

正式會員
219.xxx.xxx.236

2008-10-30 22:51

[#85] etsang3 修理好聲"山水"機一部
estang兄 safetycable條thread係乜重有冇? thanks for your　ｇｒｅａｔ　ｗｏｒｋｓ！

devilangel

正式會員
219.xxx.xxx.122

2008-10-30 23:17

[#86] etsang3 修理好聲"山水"機一部
好! 大家安全最重要,修理用上呢條cable會加倍安全。

etsang3

正式會員
203.xxx.xxx.119

2008-10-31 09:20

[#87] etsang3 修理好聲"山水"機一部
bbqiller hing, I missed your question.
What amp you want to change from 110V to 220V ?
If the transformer primary side is multi-taps it cab be changed otherwise need to change the Transformer.

etsang3

正式會員
203.xxx.xxx.215

2008-11-01 21:06

[#88] etsang3 修理好聲"山水"機一部
唉!部AU-D9又番鷑,發覺燒鑆ower管,無理由100零mA BIAS會燒power管假,細看原來都係Remark貨。我幫襯開果間(好似轉鬫挐)都賣remark貨,真失望。
換過哂 D On-Semi power管,又再Boom..Boom..Boom..鰲X粒鍾,明天可以call機主囉機苤C
＜＜請認住呢D假,7DY?大細字?)