SinusLive SL-A1500 help needed.

kimschips · 21st February 2010, 01:39 PM

Hey all.

I have a SinusLive SL-A1500 car amplifier

Error: The amplifier won´t start up.

Have any of you experience with repairing this amplifier before?

Best regards

Kim

Perry Babin · 21st February 2010, 05:39 PM

Is the amp completely dead or going into protect? If it's completely dead, post the DC voltages on the driver IC (TL494?).

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 · 24th February 2010, 07:27 PM

Hello

Thank you for your time

The amplifier draws a lot off current and the red led protected lights

Do you have any idea where to measure in the amplifier?

Best regards

Kim

Perry Babin · 24th February 2010, 07:32 PM

Did you check all of the output transistors to determine if any had failed?

kimschips · 27th February 2010, 01:25 PM

Quote:

Originally Posted by Perry Babin

Did you check all of the output transistors to determine if any had failed?

Hello

Now I have measured a bit in the amplifier again.

Transistor Q8 has a short circuit.

How many transistors in the ampifier do you recommend to be replaced?

All transistors Q1,2,3,4 and Q5,6,7,8?

Thanks for all for now

Best regards

Perry Babin · 27th February 2010, 07:00 PM

Yes, you need to replace all 8 of the outputs. Since you only found one shorted, reinstall the others, clamp all of the transistors down (you'll have to place the blown one under the clamp so you can clamp the adjacent output down tightly) and power up the amp. Does it power up and produce audio (at low power output)?

Use a 15 amp fuse in the B+ line to protect the amplifier in case there is another problem.

kimschips · 11th March 2010, 11:47 AM

Hello Perry

I have now replaced all the output transistors with 8 new. (IRF640)

The amp is still in protected mode.

I can measure 53V across the output transistors

Please help again

Kim

Perry Babin · 11th March 2010, 05:29 PM

Does the amp produce any DC voltage across the speaker terminals as it powers up (or after it's power up for a few seconds)?

kimschips · 11th March 2010, 08:06 PM

Yes there is about 10V DC at the output, "constant"

What to look for then?

Thanks

kimschips · 12th March 2010, 03:46 PM

Hello again

The output varies between 0 and -10V

Have measured -46V at D17 katode here is suppose to be -12V

The katode voltage off D16 varies between +32 and -12V

Help me here?

21st February 2010, 01:39 PM	#1
kimschips diyAudio Member Join Date: Dec 2004 Location: Denmark	SinusLive SL-A1500 help needed. Hey all. I have a SinusLive SL-A1500 car amplifier Error: The amplifier won´t start up. Have any of you experience with repairing this amplifier before? Best regards Kim

24th February 2010, 07:27 PM	#3
kimschips diyAudio Member Join Date: Dec 2004 Location: Denmark	SinusLive Hello Thank you for your time The amplifier draws a lot off current and the red led protected lights Do you have any idea where to measure in the amplifier? Best regards Kim

24th February 2010, 07:32 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did you check all of the output transistors to determine if any had failed? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

27th February 2010, 07:00 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yes, you need to replace all 8 of the outputs. Since you only found one shorted, reinstall the others, clamp all of the transistors down (you'll have to place the blown one under the clamp so you can clamp the adjacent output down tightly) and power up the amp. Does it power up and produce audio (at low power output)? Use a 15 amp fuse in the B+ line to protect the amplifier in case there is another problem. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

11th March 2010, 05:29 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does the amp produce any DC voltage across the speaker terminals as it powers up (or after it's power up for a few seconds)? __________________ 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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11th March 2010, 11:47 AM	#7
kimschips diyAudio Member Join Date: Dec 2004 Location: Denmark	Hello Perry I have now replaced all the output transistors with 8 new. (IRF640) The amp is still in protected mode. I can measure 53V across the output transistors Please help again Kim

11th March 2010, 08:06 PM	#9
kimschips diyAudio Member Join Date: Dec 2004 Location: Denmark	Yes there is about 10V DC at the output, "constant" What to look for then? Thanks

12th March 2010, 03:46 PM	#10
kimschips diyAudio Member Join Date: Dec 2004 Location: Denmark	Hello again The output varies between 0 and -10V Have measured -46V at D17 katode here is suppose to be -12V The katode voltage off D16 varies between +32 and -12V Help me here?

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