[TechAssist] Re: Fisher CA-77
- From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 31 Oct 2001 09:53:23 -0500
Tony,
I have a manual for this model and the output amp ic is STK-4191, your
original post said you had installed a STK-4151-11. Could be there was a
change in parts or you may have mis-read the number on the ic. I'll scan the
schematic page and email it as an attached file tomorrow to
tonyrock@xxxxxxxxxxx
Jim Myers
jr.myers@xxxxxxxxxxx
----- Original Message -----
From: "Chaz" <chaz@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, October 30, 2001 6:53 PM
Subject: [TechAssist] Re: Fisher CA-77
>
> Hmm, I'll have to think on this one then. The reason I made the
suggestion
> was because of a similar problem with a Sony boombox I had. The left
> channel made a hum in the left channel (or would "pop" when powered
> down). Both channels showed a good audio signal signal , also. However,
> on a spectrum analyzer, it showed up different as I had suspected. I had
> already decided to replace one of the main filter caps before hand. I
ended
> up replacing both to keep it a "balanced" repair. At least it worked for
me
> that time.
>
> Anyway, as to the manual delima, for the heck of it sometime, you might
> take a look at our updated http://www.tech-assist.org/TECHLINKS.htm file.
> I've included some more links to Schematic pages I found and/or were sent
> to me from some of the other tech-assist users. I've manages to find a
few
> out-of-print and hard-to-find ones through a few of them.
>
> Good luck
> Chaz
> chaz@xxxxxxxxxxxxxxx, chaz@xxxxxxxxxxx
>
> > The power supply is OK because the Right channel is clean. The audio
> > into the final is clean on both channels. Tannebaum is no good, I wrote
> > to them asking about cost of shipping the manual to Trinidad and I got
> > no reply after 2 weeks. No way am I going to send them any money.
> >
> > Thanks for the tip anyway I will keep the list informed if I come up
> > with anything.
> >
> > Tony
> >
> >
> > James M. Knoble wrote:
> >
> > >I don't have any specifics on this one but, I would, personaly, look at
the
> > >power supply. The "hum" sounds a like grounding problem to me like a
bad
> > >capacitor and this "ground noise" is making it through to the final
stages of
> > >the amp - since you've already replaced the final. My next step would
be to
> > >look in the preamp stages.
> > >
> > >Also, a service manual is available for $17.00 - if you are looking for
one -
> > >from A.G. Tannebaum's site at http://www.agtannenbaum.com/
> > >The page that lists available schems for Fisher is at
> > > http://www.agtannenbaum.com/f_cat.html
> > >
> > >I'll keep looking, though. Good luck.
> > >Chaz
> > >-------
> > >
> > >
> > >>Date sent: Mon, 29 Oct 2001 05:41:08 -0400
> > >>From: Anthony Rock <tonyrock@xxxxxxxxxxx>
> > >>To: techassist@xxxxxxxxxxxxx
> > >>Subject: [TechAssist] Need Help With Fisher CA-77 audio
> > >>
> > >amp
> > >
> > >>Send reply to: techassist@xxxxxxxxxxxxx
> > >>
> > >>
> > >>
> > >>Hello all,
> > >>
> > >>I have a Fisher CA-77 stereo amplifier that is dead on the left
channel.
> > >>When the customer brought it in there was just a hum on the left
> > >>channel. After doing all the usual voltage checks and finding all Ok I
> > >>replaced the audio output IC which is a STK 4151-11. It still does not
> > >>work. The left channel sounded like it was on the brink of going into
> > >>oscilation and it died again. I have no service information at all on
> > >>this amp. I have been tearing my hair out for over a week now. Can
> > >>someone please help.
> > >>
> > >>Thanks
> > >>Tony
> > >>tonyrock@xxxxxxxxxxx
> > >>
> > >>
> > >>Help make your TechAssist online repair tips
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> > >>
> > >>
> > >
> > >
> > >Help make your TechAssist online repair tips
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> > >
> > >
> > >From - Tue Oct 30 03:53:56 2001
> > >X-UIDL: +>S!!gbB!!+J5!!D&/!!
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> >
> >
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>
>
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