ROCKFORD FOSGATE PUNCH 75HD

[josesony68]

Hello everyone, today I received this amplifier, to repair. To open it, I have seen that the diodes, CR5 were missing and CR6... Does anyone know which is your reference? Or someone has the diagram?
Thanks.

 

[Perry Babin]

Those were BYV27-100 rectifiers. They are part of the boost circuit for the high-side drive voltage. Email me if you want the diagram.

 

[josesony68]

Thanks, Perry, i will buy them, and install them, and see what happens, to connect the amplifier....

 

[Perry Babin]

For testing, you can use other diodes as long as they're 'fast'. You can't use something like the 1N400x because they will run hot.

 

[josesony68]

Well, while I get the original diodes, I tested with two UF3003, which I think are similar .....

When connected, and take a few seconds, the LED is red, and have burned three MOSFET, a channel.

I can? Replace, BUZ11, by IRF 540N, or not a good idea?
Can I have burned those mosfet, because of the UF3003 diodes?

 

[Perry Babin]

The N version of the 540 may not be a good choice but the non-N version will work for the outputs.

The UF3003 shouldn't cause any problems for testing. They may work as a permanent replacement. Make sure that they don't run too hot.

Did you reduce the bias setting before testing?

 

[josesony68]

I replaced the mosfet burned for four IRF540

Bias adjustment was too high (almost 3/4 of the way), could have been the cause of the destruction of the three mosfet? (Along with two diodes, "intruders" ...)

Now, I've adjusted to a little less than half, and ..... the amplifier, works great!

Another repair more successfully completed! large, Perry! thank you!

 

[Perry Babin]

If the bias is set too high, it can cause the output transistors to fail, especially if they're not clamped down to the heatsink.