I'm starting to pull my hair out on this one... A little background first....
I re-purchased this amp cheap from a friend who blew it up. Most of the output transistors and their drivers on the right channel were toast.
As it sits now, there are absolutely no output transistors in it (center heat sink is completely empty) and there are no drivers in it either. I'm stumped as to why it still won't come out of protection mode. The one thing that is baffling is that I'm getting good voltages everywhere except the -45V rail (low-power side of the power envelope). I get -65.9 volts on 4-ohm switch position or -71.1 volts on 8-ohm switch position. The 10000uf/50v cap (C510) is in danger. That -71 volts travels everywhere and I don't know where it is coming from. I've checked just about every transistor, resistor, diode and cap in this thing and can't find the problem. AC voltages from the transformer to the fuses and the rectifiers are all good.
Anyone who has experience with this amp and could help me, it would be greatly appreciated.
I re-purchased this amp cheap from a friend who blew it up. Most of the output transistors and their drivers on the right channel were toast.
As it sits now, there are absolutely no output transistors in it (center heat sink is completely empty) and there are no drivers in it either. I'm stumped as to why it still won't come out of protection mode. The one thing that is baffling is that I'm getting good voltages everywhere except the -45V rail (low-power side of the power envelope). I get -65.9 volts on 4-ohm switch position or -71.1 volts on 8-ohm switch position. The 10000uf/50v cap (C510) is in danger. That -71 volts travels everywhere and I don't know where it is coming from. I've checked just about every transistor, resistor, diode and cap in this thing and can't find the problem. AC voltages from the transformer to the fuses and the rectifiers are all good.
Anyone who has experience with this amp and could help me, it would be greatly appreciated.