[TechAssist] Re: Fisher CA-77
- From: Anthony Rock <tonyrock@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 01 Nov 2001 05:27:27 -0400
Oh Thank You, Thank You, Thank You. The set came in witha STK 4151-11
Perhaps the customer took it to someone else and they put in a 4151 when
they could not get a 4191.
Thanks again ........
Tony
PS. Try to keep the file size under 1MB. If the entire schematic is too
large just scan the output stage.
Jim Myers wrote:
>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
>>>>>database better! Submit your fixes here:
>>>>>http://www.circuitwork.com/techassist/tip/#tips
>>>>>To unsubscribe write to:
>>>>>techassist-request@xxxxxxxxxxxxx
>>>>>with unsubscribe in the subject line.
>>>>>
>>>>>
>>>>
>>>>Help make your TechAssist online repair tips
>>>>database better! Submit your fixes here:
>>>>http://www.circuitwork.com/techassist/tip/#tips
>>>>To unsubscribe write to:
>>>>techassist-request@xxxxxxxxxxxxx
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>>>>
>>>>
>>>>From - Tue Oct 30 03:53:56 2001
>>>
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>>>
>>>
>>>Help make your TechAssist online repair tips
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>>>
>>
>>Help make your TechAssist online repair tips
>>database better! Submit your fixes here:
>>http://www.circuitwork.com/techassist/tip/#tips
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>>with unsubscribe in the subject line.
>>
>
>Help make your TechAssist online repair tips
>database better! Submit your fixes here:
>http://www.circuitwork.com/techassist/tip/#tips
>To unsubscribe write to:
>techassist-request@xxxxxxxxxxxxx
>with unsubscribe in the subject line.
>
>
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