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kicker kx500.2 issues
kicker kx500.2 issues
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Old 29th October 2017, 04:42 AM   #1
rockfordfanatiq is offline rockfordfanatiq
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Default kicker kx500.2 issues

Have a kicker kx500.2 sitting here i decided to try out. upon hooking up the amp i noticed it does power on. Problem I am having is there is no sound coming out of the amp. I opened it up and checked voltage at the pre amp board on both GRD and -15v which checked out good and also the GRD and +15v and that only showed me .273v so that tells me there is an issue. Upon inspection I havent seen any burnt or smoked spots on the board. started checking all the power fets and it has 2 bad, D10 and D9. Should I just replace all the power fets and try it or should i try or change anything else?
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Old 31st October 2017, 07:22 AM   #2
rockfordfanatiq is offline rockfordfanatiq
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bump
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Old 1st November 2017, 05:56 AM   #3
Old'n'Cranky is offline Old'n'Cranky  Australia
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Old 3rd November 2017, 01:41 AM   #4
wintermute is offline wintermute  Australia
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Old 3rd November 2017, 02:11 AM   #5
Perry Babin is offline Perry Babin  United States
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D9 and D10?

The voltage regulators overheat and develop bad solder connections. At the very least, you have to add new solder, desolder and re-solder the components.


There are other options. Replacing the small transistors with 2N6488 and 2N6491 transistors and adding clip-on heatsinks will make the amp more reliable. The insulator prevents the heatsinks from shorting together.
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Last edited by Perry Babin; 3rd November 2017 at 02:15 AM.
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Old 3rd November 2017, 03:25 AM   #6
rockfordfanatiq is offline rockfordfanatiq
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D9 and D10 I believe are diodes on the power supply side of the board. They looked exactly like the mosfet transistors so I was testing the outer 2 legs and my meter kept the tone so my guess is they are open. Screwed up and cut them off of the board and have new ones in the mail.Looks like my amp is setup a little different then what you had pictured.
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Old 3rd November 2017, 03:29 AM   #7
Perry Babin is offline Perry Babin  United States
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Measuring across the outer legs is measuring across the transformer secondary windings which is why they appeared shorted.
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Old 3rd November 2017, 03:46 AM   #8
rockfordfanatiq is offline rockfordfanatiq
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im trying to upload pics of my board to my computer so i can upload them to this forum. Do you know the numbers on the board that come de-soldered
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Old 3rd November 2017, 03:48 AM   #9
rockfordfanatiq is offline rockfordfanatiq
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mine looks pretty similar just doesnt have the heat sync attatched to the transistors? Dont know exactly what they are or what to check on them
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Old 3rd November 2017, 04:06 AM   #10
rockfordfanatiq is offline rockfordfanatiq
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here is a couple photos if they work
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