SinusLive SL-A1500 help needed. - Page 2

Perry Babin · 12th March 2010, 08:10 PM

Have you checked all of the driver transistors and the gate resistors for the outputs? Those commonly fail when the outputs fail.

Do you have an oscilloscope?

kimschips · 20th March 2010, 12:11 PM

Quote:

Originally Posted by Perry Babin

Have you checked all of the driver transistors and the gate resistors for the outputs? Those commonly fail when the outputs fail.

Do you have an oscilloscope?

Yes I have

I have messured alot off DC voltage around U8-9 D16-D17 it´s looking fine now. Output has zero DC and I can load the amplifier (100W@4ohm for now)

BUT

The Power led in the amp will still not light up

Do you have any ideas for "protection voltage or ref voltage" for the protection circuit I can measure or am I still missing something here??

Best regards
Kim

Perry Babin · 20th March 2010, 12:18 PM

Does it produce rail voltage?

If not, post the DC voltage on the TL494 (594) power supply IC.

IC#
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:

kimschips · 20th March 2010, 04:17 PM

Quote:

Originally Posted by Perry Babin

Does it produce rail voltage?

If not, post the DC voltage on the TL494 (594) power supply IC.

IC#
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:

The rail (psu) voltage is +- 62V

I that what you mean?

Kim

Perry Babin · 20th March 2010, 04:42 PM

Yes.

When I get back in the shop tonight, I'll see if I can determine what's causing the amp to appear to be in protect mode.

luka · 21st March 2010, 08:06 AM

he also wanted voltage, compared to gnd, of every pin of TL, check schematic, I think you can see were led is connected to

Perry Babin · 21st March 2010, 08:36 AM

Do you have the schematic diagram?

luka · 21st March 2010, 08:42 AM

I do, most of it anyway, need it?

Perry Babin · 21st March 2010, 08:43 AM

Yes. It sure would save a lot of time.

babin_perry@yahoo.com

kimschips · 24th March 2010, 08:37 PM

Quote:

Originally Posted by Perry Babin

Yes. It sure would save a lot of time.

babin_perry@yahoo.com

The "protect led" is lightning at start when you turn on the amp and then the led turns off again when the power amp is startet op
allright

But not the power led

I will measure TL 494 for you all 16 pins

12th March 2010, 08:10 PM	#11
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Have you checked all of the driver transistors and the gate resistors for the outputs? Those commonly fail when the outputs fail. Do you have an oscilloscope? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th March 2010, 12:18 PM	#13
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does it produce rail voltage? If not, post the DC voltage on the TL494 (594) power supply IC. IC# 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: __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th March 2010, 04:42 PM	#15
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yes. When I get back in the shop tonight, I'll see if I can determine what's causing the amp to appear to be in protect mode. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st March 2010, 08:06 AM	#16
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	he also wanted voltage, compared to gnd, of every pin of TL, check schematic, I think you can see were led is connected to __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

21st March 2010, 08:36 AM	#17
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have the schematic diagram? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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21st March 2010, 08:42 AM	#18
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	I do, most of it anyway, need it? __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

21st March 2010, 08:43 AM	#19
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yes. It sure would save a lot of time. babin_perry@yahoo.com __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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