Have a problem on my Tascam US 224 where I suddenly lost all input signal on my XLR and line inputs. This hapened right after I connected my Rode NT1 to the unit, via an external phantom power supply that was already switched on. The volume ouput on the soundcard was set at zero, but one trim pot was set at maximum. Could this have dammaged something on the input circuit? The unit is operating fine otherwise, has power and plays back without problems. How can I prevent a repetition in the future? Also does anyone know what repair costs for this kind of dammage on these units might run to? ie would it be better to fix, or buy a good used unit on E-bay? Thanks PS: I am currently working in Korea, so getting feedback on these issues is not as simple as running out to the nearest Guitar centre... any help is appreciated.