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Old 12th December 2009, 05:45 PM   #1
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Default Memphis 16-ST500D

Im working on this amp someone brought to me. Im wondering what power supply fets go in it since everyone of them were cut of the board.

Second question is: what size are the internal fuses suppose to be

Any help would greatly be appericated
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Old 12th December 2009, 08:11 PM   #2
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I've never worked on a 500 but it's likely they used IRF3205s like the 1000.

From what I found on line, it appears that it would use two 25 amp fuses.

At least one of the driver transistors on the power supply driver board has likely failed also.
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Old 12th December 2009, 09:30 PM   #3
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Thanks Perry,
Now the other question is they also cut all the outputs off the board i believe they are 640's and 9640's But wondering if you or anyone else might know what order they go in?? Any help would greatly be appericated
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Old 12th December 2009, 10:22 PM   #4
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There are likely more 9640s than 640s (the amp may use 540s and 9540s if the rail voltage is less than 50v).

All of the source legs for the 9640s will be connected directly (~0 ohms) to the center leg of the positive rectifier.

The source legs of the 640s will be connected to the center leg of the negative rectifier.
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Old 12th December 2009, 10:50 PM   #5
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Ok cool thank you perry.

! more question i was checking the driver board and a transistor marked a1023 has a leg broke off it Wondering what the part number is thata i need to order . Or can i sub this part for a differnt one ?? I have alot of a916 but not sure its the same
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Old 12th December 2009, 11:05 PM   #6
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The 2SA916 is not a suitable substitute.

The original (KTA1023 or 2SA1023) is difficult to find.

If you have a 2n6491, you can use that but you'll have to install it facing the opposite direction since the pin configuration is reversed.

I use the 6491s as replacements for the 2SA1266 drivers also when there is sufficient clearance. Sometimes, I have to cut the tabs off of the transistors to make them fit.
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Old 13th December 2009, 12:00 AM   #7
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With no outputs in the amp. I put in the irf3205's in the power supply and checked the drivers as soo as u apply the remote power it blows the 3205's.

Wondering what might cause this
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Old 13th December 2009, 12:09 AM   #8
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You should not be blowing FETs. If you clamp the FETs to the sink and either use a current limiter or a 10 amp fuse, you're unlikely to ever blow another power supply FET.

Did you check the drive signal before installing the FETs?

Have you checked all of the gate resistors?
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Old 13th December 2009, 12:14 AM   #9
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I checked all the gate resistors all check fine 47 ohm. Its been along time since i used my scope dont even remember how to use the thing wondering if u could tell me what i need the setting on to test any help would greatly be appericated
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Old 13th December 2009, 12:39 AM   #10
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Since some of the FETs are blown, remove all of them.

Set the timebase to 10uS.

Set the vertical amplifier to 5v/div.

When you touch the probe to the chassis ground, do you get a straight line trace with no vertical deflection (the trace remains at the reference line)?

When you touch the probe to the B+, do you get a straight line trace that's deflected ~2.5 divisions above the center reference line?
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