fisher amp

wev · 10th February 2004, 05:49 PM

hi all,

I'm a beginner and want to learn, i have a fisher amp 120 w p/c, i recently noticed that the right channels output was not a high as the left, trying different speakers on different channels & using a multimetre confirmed this, where do i start to look for the fault ?

Netlist · 10th February 2004, 09:30 PM

Hi Wev and welcome.
Could you tell us the type number (on the backside) of that Fisher. I might be able to get a schematic.

/Hugo

wev · 10th February 2004, 11:14 PM

hugo,

its the ca 870 model

Thanks for the reply

wev

Netlist · 11th February 2004, 11:18 AM

Ok, I'll have a look.

/Hugo

Netlist · 11th February 2004, 03:27 PM

Hi Wev
I have in front of me the schematics of the CA-866, CA-869 and CA-874. Not the CA-870.
I must say that these amps look fairly complicated and I wouldn't call it a beginners project, keeping in mind we don't have the exact schematic.
If you have a large mailbox I'm willing to send you some schematics and print layouts.

/Hugo - needs large mailboxes these days

ashok · 11th February 2004, 05:16 PM

Hi Hugo,
Could you please email me the schematic of the CA-866 and
CA-869. If they are below 5Mb it's OK. I can get multiple large emails provided each is less than 5Mb.
Thanks.
ashokm@sify.com

wev · 11th February 2004, 06:32 PM

thanks hugo,

That would be very good of you, my mail box should take them sent individually, if you know the approximate place to look on the board to look and what components my have blown or failing i can wip them out and test them.

Thanks for the help

wev

ChocoHolic · 11th February 2004, 09:14 PM

Hi Wev!

A traditional point to check would be the volume control.....
The mechanical slider inside the potis often cause inconviniences.

Good Luck
Markus

Netlist · 11th February 2004, 09:27 PM

Quote:

Originally posted by ashok

Could you please email me the schematic

Hi ashok
You mail address doesn't work

/Hugo

wev · 11th February 2004, 11:09 PM

Marcus,

Thanks for the tip but, the ca870 has two push button type controls for volume up and down.

Wev

10th February 2004, 05:49 PM	#1
wev diyAudio Member Join Date: Feb 2004 Location: notts	fisher amp hi all, I'm a beginner and want to learn, i have a fisher amp 120 w p/c, i recently noticed that the right channels output was not a high as the left, trying different speakers on different channels & using a multimetre confirmed this, where do i start to look for the fault ?

10th February 2004, 09:30 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003 Location: Belgium	Hi Wev and welcome. Could you tell us the type number (on the backside) of that Fisher. I might be able to get a schematic. /Hugo __________________ Toothpaste is bad for the teeth; it’s too sweet.

11th February 2004, 11:18 AM	#4
Netlist diyAudio Moderator Join Date: Jan 2003 Location: Belgium	Ok, I'll have a look. /Hugo __________________ Toothpaste is bad for the teeth; it’s too sweet.

11th February 2004, 03:27 PM	#5
Netlist diyAudio Moderator Join Date: Jan 2003 Location: Belgium	Hi Wev I have in front of me the schematics of the CA-866, CA-869 and CA-874. Not the CA-870. I must say that these amps look fairly complicated and I wouldn't call it a beginners project, keeping in mind we don't have the exact schematic. If you have a large mailbox I'm willing to send you some schematics and print layouts. /Hugo - needs large mailboxes these days __________________ Toothpaste is bad for the teeth; it’s too sweet.

11th February 2004, 05:16 PM	#6
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Hmmm.......me too......! Hi Hugo, Could you please email me the schematic of the CA-866 and CA-869. If they are below 5Mb it's OK. I can get multiple large emails provided each is less than 5Mb. Thanks. ashokm@sify.com __________________ AM


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10th February 2004, 11:14 PM	#3
wev diyAudio Member Join Date: Feb 2004 Location: notts	hugo, its the ca 870 model Thanks for the reply wev

11th February 2004, 06:32 PM	#7
wev diyAudio Member Join Date: Feb 2004 Location: notts	thanks hugo, That would be very good of you, my mail box should take them sent individually, if you know the approximate place to look on the board to look and what components my have blown or failing i can wip them out and test them. Thanks for the help wev

11th February 2004, 09:14 PM	#8
ChocoHolic diyAudio Member Join Date: Dec 2003 Location: Munich	Hi Wev! A traditional point to check would be the volume control..... The mechanical slider inside the potis often cause inconviniences. Good Luck Markus

11th February 2004, 11:09 PM	#10
wev diyAudio Member Join Date: Feb 2004 Location: notts	Marcus, Thanks for the tip but, the ca870 has two push button type controls for volume up and down. Wev

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