JL 300/4 Amp repair.

[nigelwright7557]

Is there any burr or rough spot on the heatsink that's possibly cutting through the kapton and shorting to the transistor?

Is it possible that the transistor tabs are touching the clamps when they're reinstalled?

I always check for a short between drain and the heatsink.
The drain is connected to the tab.

Got caught out with swarf before under the transistors.

 

[Perry Babin]

The 10 ohm resistor near the terminal connector on the driver board sometimes opens and causes the LEDs not to illuminate.

 

[DerSamoaner]

Hi

Can anyone tell me how high the BIAS must be at the JL 300/4?

After changing the output section the BIAS is to high.

Thx!

 

[Perry Babin]

Please don't post in a repair thread that was started by someone else unless you are trying to help them.

Start a new thread if you need help with a repair of your own.