Sundown Audio SAE-1200D stuck in protect - diyAudio
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Old 6th March 2010, 04:58 AM   #1
spooney is offline spooney  United States
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Default Sundown Audio SAE-1200D stuck in protect

I just got a Sundown amp in that goes into protect the second remote turn on voltage is applied. There does not appear to be any shorted outputs or ps fets either visually or testing with the meter. All fuses are intact as well. The previous owner claimed it was working fine and then just went into protect one day and obviously never came out. Voltages on the TL494 are as follows

1. 6.5 V
2. 4.5 V
3. 4.5 V
4. 0.2 V
5. 1.3 V
6. 3.4 V
7. 0.0 V
8. 13.7 V
9. 0.0 V
10. 0.0 v
11. 13.7 V
12. 13.6 V
13. 4.8 V
14. 4.8 V
15. 4.7 V
16. 0.0 V

I think something is driving pin 1 high.What are some typical things that cause this issue in this or similiar amps?
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Old 6th March 2010, 05:15 AM   #2
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Is there an LM293 near the 494?

If so, post the voltages on it.

U6?
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
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Old 8th March 2010, 04:21 PM   #3
spooney is offline spooney  United States
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There is an lm393 which appears to be a similiar part. It isnt near the 494 but there is at least one trace connecting them. I didnt get anything as far as voltages yet but i did find a shorted 15v zener connected to the vcc pin of the lm393. I havent got the chance to replace it yet. Hopefully I will have a chance to tear back into this when I get home.
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Old 8th March 2010, 04:23 PM   #4
spooney is offline spooney  United States
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I will also get a pic of the board for others to use as a reference if they need it
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Old 9th March 2010, 11:56 AM   #5
spooney is offline spooney  United States
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Well the shorted zener was a false alarm. My leads were shorting on a small buss bar. The only voltage I am seeing on the lm393 is on pins 1 and 8. Using the ground pin as reference the voltage slowly climbs to about .2 volts on both pins when power is applied but then it starts to go down and swings negative.
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Old 9th March 2010, 06:20 PM   #6
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Post a photo of the board.
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Old 9th March 2010, 11:59 PM   #7
spooney is offline spooney  United States
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Here is a few pics:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 10th March 2010, 02:01 AM   #8
Robcrx is offline Robcrx  Canada
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Is this a reflection on the caps or are they blown ??

Click the image to open in full size.
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Old 10th March 2010, 03:35 AM   #9
spooney is offline spooney  United States
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Just the flash playing tricks. The caps are not bulging by any means. I finally got some time to poke around in this amp a bit. I found 4 of the 12 PS FETS with intermittent solder connections so I went ahead and resoldered them all. The pins connecting the driver board to the main board looked as if they had seen some heat so I resoldered all of those as well hoping that might solve the issue but the amp still would not turn on. I am dreading having to pull that driver board to work on it as the whole thing is encased in black epoxy. I hope the problem is anywhere else but after seeing the solder connections going to that driver board I just have a feeling it is in there somewhere.
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Old 10th March 2010, 03:37 AM   #10
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If there were intermittent connections on the outputs, you should re-check them. A bad connection on the gate leg can cause an FET to fail.
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