fisher ca2110 amp help

srinath · 20th May 2010, 02:38 PM

Hello,
I am looking for a schematic or some help on that amp.
Can someone point me to where I can find it.
I got no sound out the left, but a pop from both channels when flipping the tone defeat switch.
Thanks.
Srinath.

srinath · 23rd August 2010, 04:05 AM

Still looking for manual schematic/circuit for this one.
Thanks.
Srinath.

jaycee · 23rd August 2010, 05:43 AM

I think my dad had this amp but cant remember exactly. A picture would help.

Anyway, these use STK amplifier modules which can often die. The power supplies for the opamps are also generated by zener referenced transistor regulators. These transistors often run HOT and fail. Also the resistors feeding the zener on those regulators can fail. Check the voltages on pins 4 and 8 of any one of the opamps you'll find.

srinath · 23rd August 2010, 01:19 PM

I found this on the net. Mine is taken apart.

It makes a pop out of both speakers when I flip the tone defeat switch.
I have swapped the stk modules from front to back but there was no change. This amp makes sound in 1 channel, and that didn't change with anything. It is I thought, losing it between the tone/volume board and the selector boards/switches.

Thanks for replying.
Cool.
Srinath.

sakis · 23rd August 2010, 02:27 PM

obvioulsy there might be some cleaning issue with the switces and pot of such an old amp but the reason of this may lay on the electrolytic caps of the amplifier ...

any small ofset that exists in the preamp section or elsewhere can be caused by electrolytics failure somewhere inside the amp

keeep in mind that any failure in the small electrolytics in the amplifier can cause a number of problems that will eventually take the amp down.

remove any of them check for leak or value drift then expect most of the others to have the same problems

replacing all will probably cost next to a few usd ... replacing all is an oportunity to upgrade most of them to something a lot better ... that will also change the total performance of the amp beyond a simple repair ...

here is a can box with help vintage amplifier repair/upgrade manual

regards sakis

srinath · 24th August 2010, 12:07 PM

Its got 24 electrolytics. All are shoei. What is a audio grade cap to swap in - nichicon ?
Cool.
Srinath.

jaycee · 24th August 2010, 09:57 PM

Rubycon, Nichicon, Nippon Chemicon, Panasonic - any good brand of capacitor will work well.

Unknownman · 28th August 2011, 12:03 PM

Hi guys, could you give me some informations about this amp ? I can't find anything about it on the internet. Regards, Antoine

20th May 2010, 02:38 PM	#1
srinath diyAudio Member Join Date: Feb 2010	fisher ca2110 amp help Hello, I am looking for a schematic or some help on that amp. Can someone point me to where I can find it. I got no sound out the left, but a pop from both channels when flipping the tone defeat switch. Thanks. Srinath.

23rd August 2010, 04:05 AM	#2
srinath diyAudio Member Join Date: Feb 2010	Manual/schematic Still looking for manual schematic/circuit for this one. Thanks. Srinath.

23rd August 2010, 02:27 PM	#5
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	obvioulsy there might be some cleaning issue with the switces and pot of such an old amp but the reason of this may lay on the electrolytic caps of the amplifier ... any small ofset that exists in the preamp section or elsewhere can be caused by electrolytics failure somewhere inside the amp keeep in mind that any failure in the small electrolytics in the amplifier can cause a number of problems that will eventually take the amp down. remove any of them check for leak or value drift then expect most of the others to have the same problems replacing all will probably cost next to a few usd ... replacing all is an oportunity to upgrade most of them to something a lot better ... that will also change the total performance of the amp beyond a simple repair ... here is a can box with help vintage amplifier repair/upgrade manual regards sakis __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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23rd August 2010, 05:43 AM	#3
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	I think my dad had this amp but cant remember exactly. A picture would help. Anyway, these use STK amplifier modules which can often die. The power supplies for the opamps are also generated by zener referenced transistor regulators. These transistors often run HOT and fail. Also the resistors feeding the zener on those regulators can fail. Check the voltages on pins 4 and 8 of any one of the opamps you'll find.

24th August 2010, 12:07 PM	#6
srinath diyAudio Member Join Date: Feb 2010	Its got 24 electrolytics. All are shoei. What is a audio grade cap to swap in - nichicon ? Cool. Srinath.

24th August 2010, 09:57 PM	#7
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Rubycon, Nichicon, Nippon Chemicon, Panasonic - any good brand of capacitor will work well.

28th August 2011, 12:03 PM	#8
Unknownman diyAudio Member Join Date: Aug 2011	Hi guys, could you give me some informations about this amp ? I can't find anything about it on the internet. Regards, Antoine

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