so i was given this kicker 354xi amp in trade a few months ago and I have actually really been enjoying it, I was using it in my off grid cabin powered by agm batteries, i normally bridge the rear channels and drive mtx terminator (I think) 10 inch sub and various random speakers on the front two channels. lately ive been using a meanwell lrs-350-12 to power it in my camper.
anyway the amp works and sounds great, i really like it, I popped it open to look at it cause i was curious amd noticed that a few 220 ohm resistors seem to be getting a bit warm. R103, R120, R313, and R320. I googled around and saw that a few other 354xi boards were burnt in the same spots.
is there something preventative I should do about this? put some new resistors in? a cooling fan? heatsink?
anyway the amp works and sounds great, i really like it, I popped it open to look at it cause i was curious amd noticed that a few 220 ohm resistors seem to be getting a bit warm. R103, R120, R313, and R320. I googled around and saw that a few other 354xi boards were burnt in the same spots.
is there something preventative I should do about this? put some new resistors in? a cooling fan? heatsink?
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Those are part of the voltage regulators. It's amazing that the regulators are essentially the simplest part of the amplifier and the part that engineers get wrong, most often.
The simplest option would be to go to the next higher power rating resistor and when installing them, leave long leads so that, when installed, they are well above the board (1/2" or more between board and body of the resistor).
Another option would be (if there is enough space) to move them to the other side of the board and install a thick (enough) piece of thermal gap pad between the resistors and the heatsink.
As a side note, the red color of these resistors could indicate that they're designed to operate at very high temperatures (higher than other resistors). When buying replacements, you may want to buy high-temp resistors if buying the same size. Physically larger (more surface area) high-temp resistors would be a bonus.
Confirm that the Zener diodes are still within tolerance.
The simplest option would be to go to the next higher power rating resistor and when installing them, leave long leads so that, when installed, they are well above the board (1/2" or more between board and body of the resistor).
Another option would be (if there is enough space) to move them to the other side of the board and install a thick (enough) piece of thermal gap pad between the resistors and the heatsink.
As a side note, the red color of these resistors could indicate that they're designed to operate at very high temperatures (higher than other resistors). When buying replacements, you may want to buy high-temp resistors if buying the same size. Physically larger (more surface area) high-temp resistors would be a bonus.
Confirm that the Zener diodes are still within tolerance.