Reasons for sound cutting in/out

[tech2014]

I have an audio receiver with sound that sometimes cuts in/out when volume is turned up. Sometimes it works fine then sounds will cut out. How common is it for capacitors to cause this. The unit I am working on is 30 years old.

[rhomanski]

Re: Reasons for sound cutting in/out

not common. more common is dirty switches and pots and bad solder. If it cuts out when volume is down cuts in when volume is increased, bad relay.

[tech2014]

Re: Reasons for sound cutting in/out

thanks

[juliadream]

Re: Reasons for sound cutting in/out

All the above advice is good. Just another thought.

What kind of wire is used to connect the board to the outputs? Is it screened signal cable?.. A few years back I encountered a Sharp amp which used thin screened cables (coax) to the speaker terminals on the back, the same stuff they used for the input wiring !! It was shorting internally, but only intermittently. Increasing the volume would clear it for a short time and then the problem would return.
Have a look and if this amp is using screened signal cables where power cable would be more suitable deal with appropriately.

[tj2]

Re: Reasons for sound cutting in/out

I just repaired an amp I got used that had an intermittent left channel. I turned out to be a cracked circuit board––the crack went right through a trace in the signal path. The crack was hard to see at first.