Phoenix Gold 500.4 car amplifier

[pk7tanner]

I'm trying to repair this amp, but I have very little experience repairing this type of equipment. I believe that two of the four channels are blown, but everything on the board looks good visually and I haven't discovered any FETs with bad readings. When I power up the amp, it acts like it's going to work, but after 10 seconds, it blows the breaker on my power supply. Any idea on what else I should check?

[stj]

Re: Phoenix Gold 500.4 car amplifier

what do the led's indicate?

[pk7tanner]

Re: Phoenix Gold 500.4 car amplifier

I'm not entirely sure. I believe it has to do with the output channels.

[goontron]

Re: Phoenix Gold 500.4 car amplifier

the large caps look faulty. push lightly on the tops of those big caps, if they flatten easy then they are probably ok, but if it takes an amount of force to push them down they are faulty.

[pk7tanner]

Re: Phoenix Gold 500.4 car amplifier

the large caps look faulty. push lightly on the tops of those big caps, if they flatten easy then they are probably ok, but if it takes an amount of force to push them down they are faulty.

Those are just the covers. The caps don't appear to have any actual bulging.

[Longbow]

Re: Phoenix Gold 500.4 car amplifier

Strange way to troubleshoot an amplifier. You'll need an adjustable power supply with an ammeter, a load bank, signal generator and scope. The amp waits until the dc on the output has settled. That might account for the 10 second delay. It would also suggest that some of your outputs or the drivers or both are faulty. Let's start with a schematic.

[pk7tanner]

Re: Phoenix Gold 500.4 car amplifier

Strange way to troubleshoot an amplifier. You'll need an adjustable power supply with an ammeter, a load bank, signal generator and scope. The amp waits until the dc on the output has settled. That might account for the 10 second delay. It would also suggest that some of your outputs or the drivers or both are faulty. Let's start with a schematic.

If you can find a schematic, I'd be rather surprised. PG is notorious for their lack of repair info available. But if you need all that equipment to fix an amp, I'm SOL anyway.