No right channel- Sansui 2000a replaced transistors on pre amp and driver and

[Kevin Kreigh]

Hello. I replaced transistors on my Sansui 2000a F-1222-1 tone/pre amp and F1180 driver board with KSC1845. Went OK. My soldering skills are not great. Both left and right channels working fine prior, but with audible noise-I had read several things about the transistors, so I went for it.
If I plug a source into main input, all sounds great-both channels with reduced noise. So, perhaps I did something on pre amp? Transistors are pinned correctly. I've checked over and over. I do get audible, kind of like small pop from right channel when turn on receiver, but no music from any attempted source, except plugging into main input. Any help and guidance much appreciated.
Thank you!

 

[EastPoint]

Check to make sure you put in the correct transistors. Otherwise maybe a broken wire on the preamp board?

 

[Kevin Kreigh]

Eastpoint--transistors were as recommended per the really good Conrad Hoffman blog regarding updating the 2000a. I did have a wire disconnect, but luckily I had taken a picture prior to doing anything and got it in right spot (I think?). I took another look, and I'm afraid I've done damage to a trace and possibly through hole of transistor leg. I'll have to clean up area and I'll post a pic. After inital post, I tried to add a wire jumper to follow trace--didn't work. Been kind of driving me nuts I messed it up and can't figure it out.

 

[jd3rdcoast]

I recently installed all of the CH mods on a 2000X without any issues. Double check orientation of the KSC1845's. Can easily put them in backwards. (As I have done in the past).

 

[AnalogueBen]

Yep, pull the transistors on that channel, desolder all the traces and look under bright light for damage, are you using solder wick/braid to remove old solder? Also look for any bridging that occurred from your work, a tiny splatter of solder across traces can cause drop outs. Take pics and report back.