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Old 2nd May 2011, 05:56 AM   #1
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Default MTX 6500d

Hello, this is my first post and im still learning. Ive read many posts and it gives me a headache at times, haha.
I recently picked up this amp and for some reason when i hook it up to my power supply it only reads around 2.5 volts. Any other amp(including the other non working amps i have) ive hooked up reads 13.8 volts instantly. Am i looking at replacing fets, etc? This site is most appreciated and i plan on buying the BCAE Repiar Tutorial asap, thanks
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Old 2nd May 2011, 02:34 PM   #2
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It sounds like it's drawing excessive current. Does it draw down the power supply voltage without remote voltage applied?
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Old 2nd May 2011, 04:31 PM   #3
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Yes. Thank you for the quick response
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Old 2nd May 2011, 04:39 PM   #4
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Remove FET601-FET604 and check them out of the circuit. If none appear shorted, clean up the solder pads for the FETs to ensure that there are no solder bridged ans connect the amp to the power supply. Does it still drag down the voltage?
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Old 2nd May 2011, 05:59 PM   #5
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Im guessing i need a certain tool to remove the FETs? FET604 definately appears to have some kind of damage to it.
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Old 2nd May 2011, 06:30 PM   #6
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Yes, you'll need solder, a good soldering iron, a desoldering pump or desoldering braid and a multimeter.
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Old 2nd May 2011, 06:54 PM   #7
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Have a multimeter already, will pick up the other items and post what i find, thank you
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Old 4th May 2011, 07:40 AM   #8
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How do i check them when i have removed them? Thanks
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Old 4th May 2011, 02:09 PM   #9
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Follow the link to the Basic Transistor Testing page in the sig line below. Use the test for FETs.
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Old 4th May 2011, 07:10 PM   #10
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Sounds good, thank you
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