[TechAssist] Re: Fisher CA-77
- From: "Chaz" <chaz@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 30 Oct 2001 17:53:42 -0600
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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> >>
> >>
> >
> >
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> >
> >From - Tue Oct 30 03:53:56 2001
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>
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>
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