This zx850.4 is driving me batty. I replaced all the mosfets on one channel (burned out) and also r58 resistor is smoked barbecued. I cant read the colors on it to replace anyone got a schematic so they can check its value for me? Or if possible send me a copy of the schematic for this amp? Thanks in advance!
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That resistor is a gate resistor for the FET that it's connected to (terminal 1 of the FET is the gate). They generally only fail when the FET fails. When one FET fails, you have to replace all parallel FETs (at the very least). It's value is the same as the other gate resistors for the adjacent FETs.
That resistor is a gate resistor for the FET that it's connected to (terminal 1 of the FET is the gate). They generally only fail when the FET fails. When one FET fails, you have to replace all parallel FETs (at the very least). It's value is the same as the other gate resistors for the adjacent FETs.
I believe the resistor in question is R59. R58 is the 22 ohm resistor just below C15.
The gate resistors R60 & R61 appear to be 100 ohms judging from the photo and my recall of this amp. The color code for a 100 ohm resistor is brown,black,brown.To be sure remove R60 and measure with an ohmmeter.Check all of the gate resistors and replace any that are out of value.
The mosfets may have failed due to shorted output devices, shorted rectifier diodes and or filter capacitors. Cracked or broken traces from the drive to the mosfets will cause the mosfets to fail.
The gate resistors R60 & R61 appear to be 100 ohms judging from the photo and my recall of this amp. The color code for a 100 ohm resistor is brown,black,brown.To be sure remove R60 and measure with an ohmmeter.Check all of the gate resistors and replace any that are out of value.
The mosfets may have failed due to shorted output devices, shorted rectifier diodes and or filter capacitors. Cracked or broken traces from the drive to the mosfets will cause the mosfets to fail.
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