Help Rockford 1100a2

[stoke]

hi im new in this forum and i need a lil help on a RF 1100a2.. i replaced some IRF9640, IRF640, 0.1 ohm resistor and the LM337 regulator and the amp was playing fine with a lil noise... yestarday i disarm the amp again to check the source of the noise but when i turn on the amp with the current protection on the ground i see some current flowing and the Q5,Q6,Q13 and Q12 transistor are getting hot quickly..

i hope some one could help me on thise one..

PD. i dont have any osc. here just in my job and i will be free for a week

[stoke]

recheck....
Q5,Q6,Q12 and Q13 are not shorted and i got 5volts on gates

i don't have any voltage on the Rectifiers U7 and U5.

[Perry Babin]

What is the DC voltage with one probe on the center leg of U7 and the other probe on the center leg of U5?

[stoke]

neg probe on U5 and Pos on U7 center legs i got -7 volts

[Perry Babin]

Do you have 5v on the gates of ALL of the power supply FETs? Check each one.

[stoke]

yes

[stoke]

Originally Posted by stoke

yes

i have 5 volts on all of then

[Perry Babin]

That would tend to indicate that the FETs are all OK.

You stated that you had the current protection on ground. Do you mean you had a current limiter connected to the ground terminal of the amp?

[stoke]

yes is a lil trick i learn to stop blowing things when you're testing

[Perry Babin]

Having the current limiter on ground can cause problems, particularly when you connect a signal source to the amp. Connect it inline with the B+ line instead.

What is the DC voltage measured directly across the B+ and ground terminals on the amp when you have only 7v DC across the two rectifiers?