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Audiopipe AP1500D issue
Audiopipe AP1500D issue
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Old 10th June 2019, 01:16 AM   #11
Basshead1989 is offline Basshead1989  United States
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Ok on the high side with the probe ground on the source leg and probe on the gate leg also wire jumper on speaker terminals I get just a tad over 1 volt as shown in pic below.

Now on the lowside if I ground to -12v terminal i get what was shown in tbe previous pic of the lowside but if I try to put probe ground on the source leg it goes straight to protect Is that normal.

By the way the rail caps are not in at the moment if that matters.
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Old 10th June 2019, 02:49 AM   #12
Basshead1989 is offline Basshead1989  United States
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Oh I forgot the the time/volt div. For high side drive above was.

1v. 10us.
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Old 10th June 2019, 03:10 AM   #13
Basshead1989 is offline Basshead1989  United States
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Perry it does the same thing with the rail caps if i put them back in it with the rectifiers still out it goes into protect.

When I pull the rail caps back out the amp powers on.

The filter rail caps are out as well.

But I just wanted to let you know this just in case it's helpful
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Old 10th June 2019, 03:27 AM   #14
Perry Babin is offline Perry Babin  United States
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Did the bad rail cap possibly leak electrolyte onto the board?

If so did you clean the area with acetone?
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Old 10th June 2019, 05:14 AM   #15
Basshead1989 is offline Basshead1989  United States
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No I didn't see any from the rail caps however there was a small cap labeled c82 that leaked on board and messed up the threw hole connection so I cleaned it with 91% isopropyl alcohol and left the new cap longer so I could solder the trace from the top of the board.

The rails caps did pull most of there vias when I took them out even with lots of heat they still pulled out so I had to reconfigure them so I could solder there leads from the top and bottom of the board for a proper connection as seen below.

Pics below
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File Type: jpg 20190610_010302.jpg (988.9 KB, 29 views)
File Type: jpg 20190610_010348.jpg (218.0 KB, 26 views)
File Type: jpg 20190610_005134.jpg (1,016.2 KB, 26 views)
File Type: jpg 20190610_005147.jpg (1.04 MB, 26 views)
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Old 10th June 2019, 05:22 AM   #16
Perry Babin is offline Perry Babin  United States
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For anyone reading this, do not pull caps, especially snap-mount caps (large, rigid terminals) unless you absolutely have to.

The problem of going into protection may simply be a random occurrence and not associated with the caps.

See what you can do to git it to power up to get to read the waveforms.

Is there any DC on the output of the amp?

It looks like you have an output installed. Did you have all of them removed when you were trying to get it to power up?
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Old 10th June 2019, 05:48 AM   #17
Basshead1989 is offline Basshead1989  United States
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I had to pull the rail caps back out in order for the amp to power on and I got 0.0 VDC on the output terminals.

There is no outputs in the amp the mosfet in picture is on the power supply as shown in the picture below.

I pulled the rails cap last after left with no other option and found one was shorted and the amp powered up.

But if I put the rectifiers, output fets, rail caps back in the amp in any order the amp will protect.
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File Type: jpg 20190610_013456.jpg (1.09 MB, 12 views)
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Old 10th June 2019, 05:51 AM   #18
Perry Babin is offline Perry Babin  United States
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Post the DC voltage on all pins of the TL494. Copy and paste the following for the voltages.


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
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Old 10th June 2019, 06:08 AM   #19
Basshead1989 is offline Basshead1989  United States
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Pin 1: 4.99
Pin 2: 7.22
Pin 3: 0.058
Pin 4: 0.00
Pin 5: 1.466
Pin 6: 3.582
Pin 7: 0.00
Pin 8: 12.06
Pin 9: 5.127
Pin 10: 5.113
Pin 11: 12.06
Pin 12: 12.06
Pin 13: 4.99
Pin 14: 4.99
Pin 15: 2.045
Pin 16:0.004

Power supply waveforms in pics below.
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File Type: jpg 20190610_015522.jpg (982.4 KB, 8 views)
File Type: jpg 20190610_015555.jpg (893.0 KB, 5 views)
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Old 10th June 2019, 06:10 AM   #20
Perry Babin is offline Perry Babin  United States
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The amp isn't in protect. Are there no drive signals at the outputs right now?
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