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Thread Tools | Search this Thread |
24th December 2012, 02:45 PM
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#1 |
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diyAudio Member
Join Date: Sep 2009
Location: Wisconsin
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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.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator |
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24th December 2012, 03:22 PM
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#2 |
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diyAudio Member
Join Date: Sep 2009
Location: Wisconsin
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Also R4, should that be 8.2ohm 5W. Someone put a huge ceramic resistor in there and not sure if it is correct.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator |
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24th December 2012, 04:23 PM
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#3 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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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.
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24th December 2012, 04:36 PM
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#4 |
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diyAudio Member
Join Date: Sep 2009
Location: Wisconsin
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Thanks, the pull downs are 2K already. Those look factory to me.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator |
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