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Old 16th February 2013, 03:20 AM   #1
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Default Polk Audio PA880

This amp has FQP50N06's with 100 gate resistors..

Would the Z44,46's work as replacements?

And if so do i need to change the gate resistors?
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Old 16th February 2013, 05:10 AM   #2
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Either should work with the 100 ohm resistors but you need to force the supply to full duty cycle (assuming that it has a regulated supply) and confirm that the FETs remain cool at idle.
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Old 16th February 2013, 04:17 PM   #3
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Replaced power supply fets..

Amp still doesnt power up ..

Heres what i get on the 494

Pin 1:0.00
Pin 2:1.90
Pin 3:0.06
Pin 4:0.00
Pin 5:0.48
Pin 6:0.60
Pin 7:0.00
Pin 8:2.69
Pin 9:0.00
Pin 10:1.27
Pin 11:2.68
Pin 12:2.68
Pin 13:1.88
Pin 14:1.88
Pin 15:1.88
Pin 16:4.42
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Old 16th February 2013, 05:36 PM   #4
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Check to see where your remote voltage stops betwwen the terminal and the IC.
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Old 16th February 2013, 06:15 PM   #5
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What pin or pins of the 494 shouls have 12 volts ?
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Old 16th February 2013, 07:07 PM   #6
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Pin #12 is Vcc it should have battery voltage.

Pin#13 is the output it should have battery voltage.

Look up the data sheet and see which pins are what.
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Old 16th February 2013, 07:16 PM   #7
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Pins 8, 11 and 12 should have B+. Pin 13 is the mode pin and is generally tied to pin 14.
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Old 18th February 2013, 10:56 PM   #8
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Pins 8,11,12 should have 12 volts is that B+ or remote voltage so i can back track the circuit?
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Old 18th February 2013, 10:58 PM   #9
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Backtracking would start at those pins and go backwards in the circuit.
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Old 18th February 2013, 11:30 PM   #10
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I tracked it back to a 4458 IC

Heres the voltages i get on it..

Pin 1:1.43
Pin 2:1.91
Pin 3:0.81
Pin 4:0.00
Pin 5:6.82
Pin 6:12.55
Pin 7:1.42
Pin 8:13.72

Does this appear to be ok??

If so ill back track furhter
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