kicker zx400.1 issues

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#21
ok thank you im hoping thats the problem. im guessing the guy i bought it from on ebay tried to fix it himself by replacing the whole line with the irf9640's and didnt notice that two were irf640's. i will order some of those and see if that fixes it and once again thank you so much for your help i really appreciate it.
 
#26
ok thanks i will give it a try and yeah i did little research before buying just figured they were all the same but these are definitely not giving me the same readings as the ones i took out. but thanks again i will let you know how it goes when the parts get in unless i can find them locally somewhere reasonable which i doubt in va lol
 
#27
the IRF640's tend to fail more often then the IRF9640's. The 640's should read 50kohm across the outside leads, with the mosfets in or out of circuit.The 9640's should read 50kohm also outside to outside.Be sure that the gate resistors(they will be attached to the first pin on the left, looking from the top with the power terminals on the right) read the correct value. I believe the value is 10 ohms(The value is printed on the top of resistor) If the gate resistor is out of value it will cause the mosfet to blow.
 
#28
I am getting 50 across all outside leads. if the gate resistors values were off would i still get this reading? and there are two types one says [104] and the other [100]. i took one of each off of the circuit to test and the [100] read 10ohms and the [104] read 100ohms. thanks
 
#29
getdachewin said:
I am getting 50 across all outside leads. if the gate resistors values were off would i still get this reading? and there are two types one says [104] and the other [100]. i took one of each off of the circuit to test and the [100] read 10ohms and the [104] read 100ohms. thanks
Click to expand...
check the values here : SMD resistor code calculator
on board measures could be lower than resistor says because the other components in the same layout. for precise measurement have to carefully remove it from board. gate resistors are critical. if one is open or in higher value state will blown the mosfets again.
 
#32
ok thanks id like to replace one of them for sure if not all of them and im unsure as to what size they are? i have a what looks to be a size smaller [104] can i use that or will it mess it up?will it make a difference if i just order the same amount?can they be a size bigger? thanks again
 
#37
ok so i got all the parts in today. i ended up replacing two 100k and one 10ohm smd resistors. all four irf9640's and two irf640's. it works and powers on and everything and seems to work fine. my only concern is a really faint high pitched noise coming from inside the amp not sure if its a big deal or not i could barely hear it and it appears to only come from inside the amp. i was thinking it was from not having enough power or something because i used a old computer power supply.
thanks for all your help im happy to make it this far
 
#39
The high pitched noise is common for this amp. It's coming from the power transformer.If you gentle push the winding's away from the core you will noticed a change in pitch and maybe at a diminished level. You can apply a thin layer of clear silicon around the top of transformer if it is an issue,otherwise you are good to go. Good Job!
 
#40
thanks again i couldnt of fixed it without all of the help from you guys! and that faint noise doesnt bother me one bit just wanted to make sure...And now to fix a older rockford fosgate 4 channel amp with no noticeable damage. it looks like quite the task compared to the d series lol
 
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