ZX750.1 up in flames.

dartssport · 20th May 2013, 02:33 AM

I have a ZX750.1 Kicker monoblock, when I hooked it up it was like the forth of July.

I pulled it and replaced it with an other ZX750.1 and works like a champ. I pulled the board and all of the IRF3205's are fried. And this amp is a little different then the last amp I worked on, the (I believe) gate resistors are little black squares with 101 and some with 104 stamped on them. is this the resistance or is it some kinda code? What voltage should i see at the pins? also i dont see any driver transistors anywhere on the board. Ill post some pictures, Perry was a great help on the last one i worked on(still waiting for some parts for over a month)..
and help would be great.

Thanks
Jon..

dartssport · 21st May 2013, 12:38 AM

Ok from experience I know the PS is shot but Im not sure what caused it so I and gonna replace the PS, Driver Transistors, and the output transistors and well as the gate resistors. I was told that the 101 stamped on the resistors is 100 ohm?

Heres my parts list any crossable part numbers would be greatly appreciated.

IRF3205 x 8
IRF9640 x 6
IRF640 x 4
100 ohm resistors x 8
ASG23 drivers x 2

Now ive never heard of a ASG23 transistor and wonder if 100 ohm resistors is too much, not enough deadtime?

Ok all you pros out there am I missing anything??

How much should the rail voltage be?

any info at all please
Thanks
Jon

20th May 2013, 02:33 AM	#1
dartssport diyAudio Member Join Date: Jan 2013 Location: Flint, Michigan	ZX750.1 up in flames. I have a ZX750.1 Kicker monoblock, when I hooked it up it was like the forth of July. I pulled it and replaced it with an other ZX750.1 and works like a champ. I pulled the board and all of the IRF3205's are fried. And this amp is a little different then the last amp I worked on, the (I believe) gate resistors are little black squares with 101 and some with 104 stamped on them. is this the resistance or is it some kinda code? What voltage should i see at the pins? also i dont see any driver transistors anywhere on the board. Ill post some pictures, Perry was a great help on the last one i worked on(still waiting for some parts for over a month).. and help would be great. Thanks Jon..

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21st May 2013, 12:38 AM	#2
dartssport diyAudio Member Join Date: Jan 2013 Location: Flint, Michigan	Ok from experience I know the PS is shot but Im not sure what caused it so I and gonna replace the PS, Driver Transistors, and the output transistors and well as the gate resistors. I was told that the 101 stamped on the resistors is 100 ohm? Heres my parts list any crossable part numbers would be greatly appreciated. IRF3205 x 8 IRF9640 x 6 IRF640 x 4 100 ohm resistors x 8 ASG23 drivers x 2 Now ive never heard of a ASG23 transistor and wonder if 100 ohm resistors is too much, not enough deadtime? Ok all you pros out there am I missing anything?? How much should the rail voltage be? any info at all please Thanks Jon