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Did someone say twist and push? On topic, it's usually around 300-340C for normal slow everyday soldering. When I am doing assembly and want to do things very quickly I rise the temperature to 350-380C. Both with 60/40 solder.

They're active high logic signals, so it's either 5V or 0V. SV0 is grounded and always inactive. The other 8 volume levels are just formed by counting through all possibilities in binary: Volume Level | SV1 - SV2 -SV3 0 | 0 - 0 - 0 1 | 1 - 0 - 0 2 | 0 - 1 - 0 3 | 1 - 1 - 0 4 | 0 - 0 - 1 5 | 1 -...

Check the volume control signal lines between the ASC and the Sony chips. They'll either be open or you shorted them while replacing the caps in the audio section.