[Shop-talk] Audio receiver repair?

[Jim Franklin]

I have looked at that page and it's great info, but I don't have enough 
electrical knowledge to know what to look for. If I found the offending 
part I could replace it, but unless there's spooge all over a cap, I'm 
not sure I'd know what "leaky" was. I'm guessing the power supply caps 
are the two big blue ones near the transformer? No leaks there....

I didn't crank up the volume, and also to Roland's point I did stop 
using the four 4 ohm speakers after blowing 3 fuses:-)

Can these types of problems be tested with a multimeter or does it 
require a scope?

jim

On 5/29/2014 11:10 AM, Peter Murray wrote:
> The lower impedance should not have caused any damage, unless you 
> cranked the volume way up and blew the amp. It sounds like you have a 
> power supply inside the amplifier that has failed. Power supplies 
> often have electrolytic capacitors for filtering and stabilization, 
> and they can dry out over time and send the supply circuit out of 
> spec. I would start there.
>
> This page may have some helpful items: 
> http://www.davidreaton.com/Model_300_repair_experiences.htm
>
> -Peter
>
>
> On Wed, May 28, 2014 at 8:14 AM, Jim Franklin <jamesf at groupwbench.org 
> <mailto:jamesf at groupwbench.org>> wrote:
>
>     I have an old Advent model 300, which was a nice unit back in the
>     day. I put it in the garage and connected it to a pair of
>     bookshelf speakers and a dual-speaker subwoofer. It made no noise
>     for a few minutes and then went POP.
>
>     THEN I read the manual which said don't plug it into 4 speakers of
>     less than 8 ohms each. Mine are all 4 ohms :-\
>
>     I found a blown fuse and replaced it but now it blows right away.
>     Is there any way for someone mostly clueless about electronics to
>     diagnose what's broke? I have a basic multimeter for tools, and I
>     understand big electrons, but not the small ones...
>
>     thanks,
>     jim
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