Hello,
I have my old sansui 555a, in which some time ago I replaced all electrolytic capacitors and most transistors. Everything was great, but sometimes the right channel stopped working. I noticed that the problem may be in the switches, so I bought Deoxit D100 and Fadergrease and cleaned all switches and potentiometers. I turned on the amplifier and heard a noise. I got nervous and decided to improve the soldering of two cables at the low filter switch, which I broke when cleaning. Unfortunately, after soldering, wanting to quickly check if it works, I did not connect the F-1272 board. As it turned out later, I didn't put on a metal cover on top. When I put it on, the noise was gone. But after soldering, there was no right channel either. Could I burn something without connecting the F-1272? I checked the voltages on the power transistors, on C819 and C820, I checked the fuses and everything is ok. The switch I soldered was checked many times and it seems to be ok. What could happen?
I have my old sansui 555a, in which some time ago I replaced all electrolytic capacitors and most transistors. Everything was great, but sometimes the right channel stopped working. I noticed that the problem may be in the switches, so I bought Deoxit D100 and Fadergrease and cleaned all switches and potentiometers. I turned on the amplifier and heard a noise. I got nervous and decided to improve the soldering of two cables at the low filter switch, which I broke when cleaning. Unfortunately, after soldering, wanting to quickly check if it works, I did not connect the F-1272 board. As it turned out later, I didn't put on a metal cover on top. When I put it on, the noise was gone. But after soldering, there was no right channel either. Could I burn something without connecting the F-1272? I checked the voltages on the power transistors, on C819 and C820, I checked the fuses and everything is ok. The switch I soldered was checked many times and it seems to be ok. What could happen?