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Old 25th October 2011, 11:15 PM   #1
timwebb is offline timwebb  United States
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Default Memphis mojo orange flame

do anyone know the placement for the output transistors in this amp? thanks!
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Old 26th October 2011, 12:47 AM   #2
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You need to provide exact model numbers or a good quality photo when asking for help.

16-MC2000D?
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Old 26th October 2011, 12:56 AM   #3
timwebb is offline timwebb  United States
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yes.
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Old 26th October 2011, 01:08 AM   #4
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Use your multimeter to find all of the output transistors that have the 3rd pad directly connected. There will be two groups. The group with more transistors is for the P-channel outputs. The others are for the N-channel outputs. All of the 0.02 and 0.04 ohm current sense resistors will have to be intact/within tolerance for this to work.
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Old 27th October 2011, 02:17 AM   #5
timwebb is offline timwebb  United States
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ok i figured out where they go. the 640's are over heating. and i can hear a frying sound from the yellow inductor in the middle. would a bad inductor make the output over heat?
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Old 27th October 2011, 04:08 AM   #6
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Are they supposed to have IRF640s in that amp? Many of these amps (or at least amps similar to these) used IRFB31N20Ds in place of the 640s. The 640s I've tried (for testing) all ran hot. Do NOT buy IRFB31N20Ds from ebay unless you KNOW the seller to be legitimate. Too many people have purchased the IRFB31N20D from ebay and they were counterfeit or otherwise not up to spec and caused a variety of problems.
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Old 27th October 2011, 10:36 AM   #7
timwebb is offline timwebb  United States
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The amp has been worked on by several people.so most parts are not the own parts. I was looking at a directed 2400 that I just got and it uses those transistors in place of the 640's. I also need the place ment of the ic's in the preamp section.the ic behind the rca jacks is missing. I will up load pictures when I'm off work.
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Old 27th October 2011, 10:49 AM   #8
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The IC behind the RCA jacks was a KIA4559. It's not widely available. Install a socket and a TL072 for now. An LM4558 may work but they can be unstable.
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Old 31st October 2011, 02:11 AM   #9
timwebb is offline timwebb  United States
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i got the amp to power up. i replaced alot of the bad transistors on the driver cards and 1ohm resistors. but when ever i install both cards both lights comes on and stay on. i cant find what im missing.
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Old 31st October 2011, 07:26 AM   #10
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What happens when you install only one driver board?
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