I'm looking at a vented C513 in a Marantz SR5400 (photo included), in the FR section on page 24 in the service manual (https://audiocircuit.dk/downloads/ma...400-avr-sm.pdf).
R533 right below it in the photo is charred, but measures the correct value.
1. I'm not familiar with amplifier circuits (at all — don't know the difference between classes, etc.) so I was wondering what problems would manifest from a supposedly non-operational C513? I didn't hear anything odd when testing the output channel with a speaker. Is there a simple test that can be done (maybe with a speaker) without having access to the back of the PCB/capacitor pins?
2. What would be a likely failure progression that caused a charred R533? Simply C513 shorting for a short while? A long while?
I've never been into AVRs so I don't know if this thing is worth saving in general (although it seemed to already work when tested with a speaker in each output in turn) but I get the impression it's a nice amp. I've already restored the volume encoder to working order. Now I'm trying to decide if it's worth the hassle to replace the inaccessible cap, when every channel already seems to work.
I find the unit itself amusing and oddly attractive because of it; it has 60 RCA connectors (lots of useless composite, not to mention s-video), it's ridiculously oversized (50 % air over the logic boards) and would require 60+ cm of depth of whatever surface you put it on, if you take the manual's mandated 20 cm air gap on all sides into account.
R533 right below it in the photo is charred, but measures the correct value.
1. I'm not familiar with amplifier circuits (at all — don't know the difference between classes, etc.) so I was wondering what problems would manifest from a supposedly non-operational C513? I didn't hear anything odd when testing the output channel with a speaker. Is there a simple test that can be done (maybe with a speaker) without having access to the back of the PCB/capacitor pins?
2. What would be a likely failure progression that caused a charred R533? Simply C513 shorting for a short while? A long while?
I've never been into AVRs so I don't know if this thing is worth saving in general (although it seemed to already work when tested with a speaker in each output in turn) but I get the impression it's a nice amp. I've already restored the volume encoder to working order. Now I'm trying to decide if it's worth the hassle to replace the inaccessible cap, when every channel already seems to work.
I find the unit itself amusing and oddly attractive because of it; it has 60 RCA connectors (lots of useless composite, not to mention s-video), it's ridiculously oversized (50 % air over the logic boards) and would require 60+ cm of depth of whatever surface you put it on, if you take the manual's mandated 20 cm air gap on all sides into account.
