Sansui receiver right channels no sound

[Cody AOC]

So I have a Sansui 5050 i've started to restore it and I can't figure out why the right channels don't work, the left channels work on A and B but they have this static crackle sound just loud enough where I can hear it but it does do some pops, but it's better than it was when all I had was nothing but static crackling very loud but that was a solder joint touching another joint but that part is fixed, how and where should i look to fix this right A and B not working problem? I have replaced the worst caps in this unit so far but not too much has been done yet.

 

[Oerets]

You could hope a good cleaning with a zero residue plastic safe cleaner of all the switches clears it up. Had it been working before the restore? I take it was not, the problem was there. Then double check your work. If not then I will guess you have more going on. Transistor somewhere in that channel be where I'd be looking. It is probably on the board mounted on it's side to the left by the transformer and power supply. One from a 6060 will also plug right in.


Barney

 

[Cody AOC]

You could hope a good cleaning with a zero residue plastic safe cleaner of all the switches clears it up. Had it been working before the restore? I take it was not, the problem was there. Then double check your work. If not then I will guess you have more going on. Transistor somewhere in that channel be where I'd be looking. It is probably on the board mounted on it's side to the left by the transformer and power supply. One from a 6060 will also plug right in.


Barney

Is it the little board that connects to the bigger board and has a connection to the top of it?

 

[Oerets]

My memory is playing tricks on me. It is the board with the fuses on it. Laying flat, not on it's side. Check the fuses also, pull and check them. The board is very easy to remove.


Barney

 

[Cody AOC]

My memory is playing tricks on me. It is the board with the fuses on it. Laying flat, not on it's side. Check the fuses also, pull and check them. The board is very easy to remove.


Barney

I already checked them they are all good even the fuse in the back of the unit is good

 

[Oerets]

Wait I was right the one board with the plug removes and it is 90* into a connection. That is the driver board the one I was thinking about originally. Have you tried running a CD player into the Aux and swapping channel inputs and see if it is always the same channel out?

Barney

 

[Cody AOC]

So i was trying to figure out why i had my issue well i went to turn off the sansui and well i made a booboo well a capacitor just exploded well it was in wrong and i never knew it well it's time to replace that and see if that was my culprit

 

[Cody AOC]

Nope it still doesn't work on the right side

 

[rcs16]

You are going to have to inject a signal into the unit and trace it with a scope. This means understanding the schematic and signal flow. Sorry to say, too many folks here trying to save a buck and not having a clue about troubleshooting.
BTW, this thread should be in the Sansui forum as it is not a specific tuner issue.

 

[Cody AOC]

You are going to have to inject a signal into the unit and trace it with a scope. This means understanding the schematic and signal flow. Sorry to say, too many folks here trying to save a buck and not having a clue about troubleshooting.
BTW, this thread should be in the Sansui forum as it is not a specific tuner issue.[/QUOTE

I couldn't find the Sansui forum, and I can't afford a scope since this will be the only time I'll be trying to fix something like this.

 

[rcs16]

I couldn't find the Sansui forum

Have to look harder, all are on the same web page.
Can you borrow a scope or know someone that understands a bit about electronics? Even having a DMM would be useful. Read up what is required to troubleshoot electronics.
it is very difficult, if not impossible to troubleshoot something with out the proper tools. Like trying to remove your tires with a set of pliers = frustrating.

 

[Cody AOC]

Have to look harder, all are on the same web page.
Can you borrow a scope or know someone that understands a bit about electronics? Even having a DMM would be useful. Read up what is required to troubleshoot electronics.
it is very difficult, if not impossible to troubleshoot something without the proper tools. Like trying to remove your tires with a set of pliers = frustrating.

Well my dad knows what it might be he said just start checking the resisters and see if any of them test a lot higher in Ohms if they do by a big difference then replace them with a new one of the same kind of one and i've found 2-3 that are 2.2K ohms and they are testing in 7.5M ohms so thats a huge difference would you think that could be the problem? None of them are burnt everything in the unit looks fine but may test bad or super high or super low in ohms. And no I don't know anyone that has any testing stuff for this just me and my dad knows some about electronics in the whole family that can repair/fix them.

 

[rcs16]

if you measure a 2K2 R in ckt and it is 7M5, then that is a problem. Is it the way you measure, poor contacts? if so have to wonder however why the R is so far out of tolerance. R's usually do not go on there own, usually something else causes them to fail. I will have to look at the schematic and you tell me exact what R's are of of tolerance.