technics amp SU-Z200 low volume problem
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From: b on 22 May 2010 09:32 On May 21, 2:45 pm, "William R. Walsh" <wm_wa...(a)hotmail.com> wrote: > If you try it, please do post back! > > William Just soldered in the other ic and guess what? same problem! a tricky one this, as there aren't that many things on the pcb common to both channels. will keep looking... -B
From: William R. Walsh on 24 May 2010 11:47 Hi! > Just soldered in the other ic and guess what? same problem! How interesting! (Okay, maybe not...) I wouldn't think that the replacement module would be broken in exactly the same way as the first, unless I were doing the work. (At times, my life is a comedy.) I suppose that something could be loading down the power supply or the output of the amplifier module. I'm not sure what it would be. William
From: b on 24 May 2010 20:04 On 24 mayo, 17:47, "William R. Walsh" <wm_wa...(a)hotmail.com> > I wouldn't think that the replacement module would be broken in > exactly the same way as the first, unless I were doing the work. (At > times, my life is a comedy.) I suppose that something could be loading > down the power supply That's what I am beginning to suspect, as it is pretty much the only common thing left! A few days back, I did also notice that as I pushed the vol. up by the small amount I could before it muted, that the sound appeared to be a *bit* distorted (as in overloaded type distortion).... or did I imagine it?! I've had to 'park' this one for now as other projects are piling up, but will probably return to it before long. watch this space.... -B
From: Mark Zacharias on 25 May 2010 06:19 "b" <reverend_rogers(a)yahoo.com> wrote in message news:d799cabb-0817-41e3-93a7-b77ec68e682f(a)q13g2000vbm.googlegroups.com... > On 24 mayo, 17:47, "William R. Walsh" <wm_wa...(a)hotmail.com> > >> I wouldn't think that the replacement module would be broken in >> exactly the same way as the first, unless I were doing the work. (At >> times, my life is a comedy.) I suppose that something could be loading >> down the power supply > > That's what I am beginning to suspect, as it is pretty much the only > common thing left! A few days back, I did also notice that as I pushed > the vol. up by the small amount I could before it muted, that the > sound appeared to be a *bit* distorted (as in overloaded type > distortion).... or did I imagine it?! > > I've had to 'park' this one for now as other projects are piling up, > but will probably return to it before long. watch this space.... > -B Really though, it's likely the problem is just somewhere else. Replacing the amp module did gain valuable information though, so it's not a total loss. That's how I look at these situations anyway... Mark Z
From: b on 25 May 2010 06:57
On 25 mayo, 12:19, "Mark Zacharias" <mark_zachar...(a)sbclobal.net> wrote: > "b" <reverend_rog...(a)yahoo.com> wrote in message > > news:d799cabb-0817-41e3-93a7-b77ec68e682f(a)q13g2000vbm.googlegroups.com... > > > > > On 24 mayo, 17:47, "William R. Walsh" <wm_wa...(a)hotmail.com> > > >> I wouldn't think that the replacement module would be broken in > >> exactly the same way as the first, unless I were doing the work. (At > >> times, my life is a comedy.) I suppose that something could be loading > >> down the power supply > > > That's what I am beginning to suspect, as it is pretty much the only > > common thing left! A few days back, I did also notice that as I pushed > > the vol. up by the small amount I could before it muted, that the > > sound appeared to be a *bit* distorted (as in overloaded type > > distortion).... or did I imagine it?! > > > I've had to 'park' this one for now as other projects are piling up, > > but will probably return to it before long. watch this space.... > > -B > > Really though, it's likely the problem is just somewhere else. Replacing the > amp module did gain valuable information though, so it's not a total loss. > That's how I look at these situations anyway... > > Mark Z Same here. At the end of the day this thing cost me nothing and is worth little -I'm doing this out of curiosity, so if I learn something from it then so much the better. ISTR the replacement module was taken from something working (a samsung midi system or something), but I could be mistaken (it was at least 6 years back) so will keep an open mind on that front -B |