I have an infinity basslink on a 1998 BMW 740i and it has worked just fine since for more than 8 years. To days ago I turn on the car and the sub was fine but after couple of minutes the sub made a a high sound like a "boom" few times and it just shuts down. The power led is on and the servo light is always on. I removed the fuse and put it back after couple of hours and turn on the car and worked fine for only few minutes. Since then the servo light is on and when i shut down the car the sub turn off after five minutes and just before that makes a bass sound. does this means is blown up?

SOURCE: Infinity basslink is messed-up

You may have blown the fuse in the AMP. Check it and let me know.

nuwan chinthaka

• 111 Answers
• Posted on Jan 13, 2009

SOURCE: basslink red light on but no sound

check the all power lines and regulator .is any of them overheating?
then check the power amp ic or transistors.

nuwan.

Testimonial: "thanks "

SOURCE: Sub is blowing fuses!! :(

The issue is most likely a short in the amp internal circutry where power is essentially flowing without resistance acrosss the short. You may or may not have sound or crackling noise as it depends on where the short is.

If you are electronically inclined, I suggest the folliowing:

- disconnect all power and open the amp up
- look for any burn marks around the circut board and parts.
- first focus in on the area where the power comes in - see if any diodes (black cylinders with stripes on them) are burnt / cracked
- next have a look at all the MOSFETS. These should be 3-legged components and will likely be mounted to the shell or heatsink. Look for any burn marks or cracks on these.
- also look for any wire or component that may be shorting other components. Generally all wires should have shielding and all components should be soldered firmly. Anything crossing other components could be a problem.

If you find any burnt/cracked components, they will need to be replaced.

Here is a sample image showing the MOSFET chips to the top and bottom on the aluminum rail.
http://memimage.cardomain.com/ride_images/3/2514/3981/31284490262_large.jpg