[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 
> >with  unsubscribe  in the subject line.
> >
> >
> >From - Tue Oct 30 03:53:56 2001
> >X-UIDL: +>S!!gbB!!+J5!!D&/!!
> >X-Mozilla-Status: 0009
> >X-Mozilla-Status2: 00000000
> >>From techassist-bounce@xxxxxxxxxxxxx Mon Oct 29 10:01:15 2001
> >Return-Path: <techassist-bounce@xxxxxxxxxxxxx>
> >Delivered-To: tonyrock@xxxxxxxxxxx
> >Received: (qmail 193302 invoked from network); 29 Oct 2001 10:01:15 -0000
> >Received: from unknown (HELO avenir.dhs.org) (168.215.193.75)
> >  by ns33.tstt.net.tt with SMTP; 29 Oct 2001 10:01:15 -0000
> >Received: from avenir.(none) (localhost [1
> >
> 
> 
> 
> 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 
with  unsubscribe  in the subject line.

Other related posts: