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-   -   SS XXX-6500 Fet31? (http://www.diyaudio.com/forums/car-audio/226359-ss-xxx-6500-fet31.html)

brandes.cm 24th December 2012 02:45 PM

SS XXX-6500 Fet31?
 
Is FET31 a IRFZ44N? It is located between the power supply pwm board and the fan. There are two fets in close proximity but I cant read the face of the existing one.

brandes.cm 24th December 2012 03:22 PM

Also R4, should that be 8.2ohm 5W. Someone put a huge ceramic resistor in there and not sure if it is correct.

Perry Babin 24th December 2012 04:23 PM

Z44s would be OK in locations FET30 and 31. They drive the small transformer.

R4 is a 4.7 ohm, 1/2w.

You should reduce the pull-down resistors R5, R6, R20 and R21 to 1k resistors. The 4.7k resistors don't pull down hard enough many times and can make the power supply FETs overheat.

brandes.cm 24th December 2012 04:36 PM

Thanks, the pull downs are 2K already. Those look factory to me.


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