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Old 7th October 2011, 06:01 PM   #1
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Default ADS 850MX

I just got another one of theese in for repair..

The boards look nothing alike at all.. Must be 2 different versions of this amp..


I opened this amp up and transistors fell out of it..


Wondering if anyone knows a good replacement for the following transistors..


First one is marked : K214

2nd one is marked: J77

They are both T0-220 AB package
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Old 7th October 2011, 07:31 PM   #2
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How are those being used? The datasheets that I found indicate that they're only rated for 1/2 amp of current.
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Old 7th October 2011, 08:11 PM   #3
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Im guessing the drivers for the outputs.. Here is a pic of the board and i put an arrow to thoose transistors..
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Old 7th October 2011, 08:33 PM   #4
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Are they shorted?
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Old 7th October 2011, 08:36 PM   #5
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The legs are broken
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Old 7th October 2011, 10:09 PM   #6
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I don't have any suggestions for anything similar. If no one else does, try an IRF540 and and IRF9540. I'm assuming that the supply voltage in this amp isn't greater than 50v.
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Old 8th October 2011, 12:30 AM   #7
RiLoWa is offline RiLoWa  United States
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It would appear that MCM has both original part numbers in stock.
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Old 8th October 2011, 04:38 AM   #8
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Does anyone know thw the value of C13 and C14 ??


The amp is missing them..
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Old 8th October 2011, 05:13 AM   #9
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Or any ideas what may work in C13 and C14 locations ?

C13 the negative side of the cap connects to the 3rd leg of the power supply fets - IRFZ34

C13's positive side connects to the middle leg of the IRFZ34



C14 does the same but in the other power supply of the amp..
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Old 8th October 2011, 03:42 PM   #10
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Ok i think i might have figured out the value of them..


Next thing is this amp has 4 power supply in it ..

1 supply per 2 channels..


There is also 4 banks of rectifiers in this amp 1 bank per 2 channels..


When trying to power the amp up it will draw excessive current and the outputs will heat up..

If i remove all 4 banks of rectifiers the amp will power up and idle perfectly..

if i try to put just 1 bank of rectifiers in it no matter what supply i put them in the amp goes back to drawing excessive current and the outputs heat up within 5 secs..

Any ideas what to check?
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