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Old 10th February 2004, 04:49 PM   #1
wev is offline wev  United Kingdom
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Default 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 ?
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Old 10th February 2004, 08:30 PM   #2
Netlist is offline Netlist  Belgium
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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
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Old 10th February 2004, 10:14 PM   #3
wev is offline wev  United Kingdom
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hugo,

its the ca 870 model

Thanks for the reply

wev
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Old 11th February 2004, 10:18 AM   #4
Netlist is offline Netlist  Belgium
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Ok, I'll have a look.

/Hugo
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Old 11th February 2004, 02:27 PM   #5
Netlist is offline Netlist  Belgium
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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
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Old 11th February 2004, 04:16 PM   #6
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Default 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
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Old 11th February 2004, 05:32 PM   #7
wev is offline wev  United Kingdom
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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
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Old 11th February 2004, 08:14 PM   #8
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Hi Wev!

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

Good Luck
Markus
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Old 11th February 2004, 08:27 PM   #9
Netlist is offline Netlist  Belgium
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Default Re: Hmmm.......me too......!

Quote:
Originally posted by ashok

Could you please email me the schematic
Hi ashok
You mail address doesn't work

/Hugo
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Old 11th February 2004, 10:09 PM   #10
wev is offline wev  United Kingdom
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Marcus,

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

Wev
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