audiobahn a8000t protection problem

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red line auto

Member - Posts: 17

Joined: May 05, 2009

Location: New Hampshire, United States

Posted: June 17, 2009 at 3:53 PM / IP Logged

I have a audibahn A8000T amp. I had it running for a while. I truned the truck off and turned it back on and it went straight in to protection. any ideas on why it did this and a way to rectifi the issue?

i am an idiot

Platinum - Posts: 13,674

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 17, 2009 at 3:55 PM / IP Logged

Chances are it has one or more shorted output transistors. Do you have a multimeter and a 2.5MM allen wrench? And a digital camera? Ampguts has no pictures of that amp. If you have the tools and the camera, I will need a picture of the circuit board. I will provide you an e-mail address when you have the pictures.

red line auto

Member - Posts: 17

Joined: May 05, 2009

Location: New Hampshire, United States

Posted: June 17, 2009 at 3:58 PM / IP Logged

yes i have both.

i am an idiot

Platinum - Posts: 13,674

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 17, 2009 at 4:06 PM / IP Logged

Since you do have a meter, use it to verify that you are getting power, ground and remote voltages to the amp.

I may need a picture of the circuit board. Remove the top cover of the amp. Careful when lifting the cover off of the amp, there may be LEDs and meters mounted on the cover and need to be unplugged from the board.

The output devices are the larger ones that are clamped to the heat sink. Do not remove any clamps untill we figure out which ones are shorted. Set the meter to the diode test function. Should be the only setting with a picture. Check between legs 2 and 3 of every output transistor. Notice the reading on each, and let me know if any read near 0.000 And let me know how many have that reading.

red line auto

Member - Posts: 17

Joined: May 05, 2009

Location: New Hampshire, United States

Posted: June 17, 2009 at 4:09 PM / IP Logged

Ok i will do that and post a pic of teh circut board later on tonight or tomorrow am. its going to take ame a lil bit to get it apart.

i am an idiot

Platinum - Posts: 13,674

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 17, 2009 at 4:29 PM / IP Logged

The only screws you need to remove are the ones on the left and right edges of the cover. Right where the cover meets the heat sink. All of the other screws can remain in the top cover.

red line auto

Member - Posts: 17

Joined: May 05, 2009

Location: New Hampshire, United States

Posted: June 18, 2009 at 1:30 PM / IP Logged

all of them range from 630 to 1160 but i am not sure which legs are two and three on this board. i have emailed you a pic of the board.

red line auto

Member - Posts: 17

Joined: May 05, 2009

Location: New Hampshire, United States

Posted: June 18, 2009 at 1:40 PM / IP Logged

i havw one other thing the fan inside the amp is missing a blade. Can that possibly cause any of my problems?

red line auto

Member - Posts: 17

Joined: May 05, 2009

Location: New Hampshire, United States

Posted: June 18, 2009 at 9:32 PM / IP Logged

ok i have check them all out. and using teh pic i sent you as refrence. the top transistor all run 622 and the bottom ones run 612 so id think they are all good. But i dont know. So any information would be greatly appreciated.

i am an idiot

Platinum - Posts: 13,674

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 18, 2009 at 9:37 PM / IP Logged

Did you check voltages on power ground and remote before you removed the amp?

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