Working on this SSL5000D amp
2 of the 4 power supply capacitors exploded.
Found several issues in the amp.
2 of the (4) 220uf 100v caps leaked, and eat through the PCB. These caps are used for filtering after the Torid coil in the amplifier section. Cleaned the PCB, installed new capacitors.
I measured the Rail voltage of the power supply t be 85.0 volts. I assumed this was the reason that the 3300uf caps exploded. (I did replace the caps)
So now I search through the DIY achieves, and found a thread on this power supply issue.
I replaced the TL431, 150K and the 6.8k resistors. I also replaced the Opti coupler that somehow feeds the regulator circuit. No change in supply voltage.
If I short the anode/cathode of the opti coupler, the rail voltage goes to 92.0 volts. This tell me I am somewhat working.
I looked at several schematics of this style amplifier (a3000), and the feedback to the PWM, is to connect to Pin 2 of the PWM. In my case , Pin 2 is 5 volts, pin 1 is 0 volts. The issue is on this board, pin 2 is wired to the 5 volt line of the SG3525.
Any ideas guys?
BTW, The amp appears to be working
2 of the 4 power supply capacitors exploded.
Found several issues in the amp.
2 of the (4) 220uf 100v caps leaked, and eat through the PCB. These caps are used for filtering after the Torid coil in the amplifier section. Cleaned the PCB, installed new capacitors.
I measured the Rail voltage of the power supply t be 85.0 volts. I assumed this was the reason that the 3300uf caps exploded. (I did replace the caps)
So now I search through the DIY achieves, and found a thread on this power supply issue.
I replaced the TL431, 150K and the 6.8k resistors. I also replaced the Opti coupler that somehow feeds the regulator circuit. No change in supply voltage.
If I short the anode/cathode of the opti coupler, the rail voltage goes to 92.0 volts. This tell me I am somewhat working.
I looked at several schematics of this style amplifier (a3000), and the feedback to the PWM, is to connect to Pin 2 of the PWM. In my case , Pin 2 is 5 volts, pin 1 is 0 volts. The issue is on this board, pin 2 is wired to the 5 volt line of the SG3525.
Any ideas guys?
BTW, The amp appears to be working
Right now its hard to say.
I don't have the amp attached to the heat sink, and its got 60 of those damn Mica washers that go all over the place when you remove the chassis.
I can re-install it if it's a test that you think needs to be performed.
I don't have the amp attached to the heat sink, and its got 60 of those damn Mica washers that go all over the place when you remove the chassis.
I can re-install it if it's a test that you think needs to be performed.
The rail voltage will generally become uneven within just a few strong notes. You should be able to safely check this outside the sink.
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