A few days ago I received Rodek r480i. Amp is working, but it was repaired. Strange to me was idle current, which is about 2A, and after an hour sitting on a bench ( without load ) it gets quite warm. Is this normal ?
All outputs are OK, but I noticed something. When I removed casing, it turns out that two supply fets getting quite hot ( M1 and M3 on simplified schematic ). M2 and M4 are cold. I know it is not normal.
I don't have a scope, but when I measured DC and AC voltages they were same on all four fets. All fets replaced but nothing new happened.
This morning I played some music. It works fine, but heating is problem. Although it has built in fan, I think it will overheat if operate few hours on high volume.
Any ideas ?
All outputs are OK, but I noticed something. When I removed casing, it turns out that two supply fets getting quite hot ( M1 and M3 on simplified schematic ). M2 and M4 are cold. I know it is not normal.
I don't have a scope, but when I measured DC and AC voltages they were same on all four fets. All fets replaced but nothing new happened.
This morning I played some music. It works fine, but heating is problem. Although it has built in fan, I think it will overheat if operate few hours on high volume.
Any ideas ?