[TechAssist] Re: Need Help With Fisher CA-77 audio amp
- From: "Chaz" <chaz@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 29 Oct 2001 04:02:58 -0600
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
>
>
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