SDS-V switch circuit
2013-07-31 by jesper
Hi list, I've finally dug into my SDS-V (hihat) card that was a bit temperamental in that, that all channel LEDs was lit upon startup and that it sometimes also played a mix of all settings between channels. With time (heating) it returned to normalt and functioned as expected. After tips from Micha I've taken a closer look and decided to change the three ICs responsible for the switching. Yesterday I realised I'd forgot to order one of them (4556). *crap* But now two are replaced and it's no longer a christmas tree. Instead only channel 1 lights up and only channel 1 can be chosen. I'd get to the third IC soon too, but want to ask a Q first... When desoldering IC1 I found PCB traces below the IC. They looked intact but on one of the IC legs there looked to be a solder bridge/post design modification, that came loose with the IC. I'll check the schematics to verify soon but wanted to see if anyone here has an unpopulated card or a picture of one and/or has the faintest idea of what I'm talking about. *unsure if this made any sense whatsoever* :S -- electronically yours, jesper - -- --- ---- ----- ---- --- -- - www.electronic-obsession.se