Mackie SRM450

[Alex Atienza]

Open resistors

Solved the faulty srm450 Gray older powered speaker with clip and thermal leds on...open circuit resistor within it's low 15+/- reg circuit a 10 ohm...

time for a tea break! Thanks to Jass p bass for schematic and pointer to the low rail voltages...

Can you tell me the specific part no of the resistors? thanks

[plec.22]

If you look at the low rail voltage regs check these for open Circuit.

[djavionyx]

Are these the two resistors in question that need replacing? I too have a No Power problem

[The Dude]

Nope. Those are not the resistors. The resistors that sometimes open are 10 ohm (I believe 1/4W if memory serves). Your unit may not have them if it's old enough.
At any rate, you should check resistors before just replacing them.

Also, see post #13. If you can't find them, you can at least find out if you need to look for them.

Welcome to the place!

[djavionyx]

Nope. Those are not the resistors. The resistors that sometimes open are 10 ohm (I believe 1/4W if memory serves). Your unit may not have them if it's old enough.
At any rate, you should check resistors before just replacing them.

Also, see post #13. If you can't find them, you can at least find out if you need to look for them.

Welcome to the place!

This is a V2, and thanks!

[Enzo]

the 450 and 450V2 are two different amps. Realy, start a new thread for yours, it will be easier.