SinusLive SL-A1500 help needed.

[Perry Babin]

Does the amp work properly other than the power LED?

[kimschips]

Here are the measurements for pins TL 494 (U7)
All voltages in DC


1 5
2 7,5
3 0
4 0
5 5V sawtooth 40uS
6 3
7 0
8 12
9 15V square 75uS
10 12
11 12
12 12
13 5
14 5
15 1
16 0

What do you think about that?

Best regards

[Perry Babin]

Re-check pins 9 and 10. They should be the same.

Which one is correct?

[kimschips]

Originally Posted by Perry Babin

Re-check pins 9 and 10. They should be the same.

Which one is correct?

Pin 9 and 10 checked again, yes they are the same 15V square

Pin 2 ,measures 10V

When you turn down the psu for the amp and the protect led lights up, then pin 3 raises to 5V
I don´t know if you can use that information

Kim

[Perry Babin]

Although it's probably not important at this point but it's strange to have pins 9 and 10 swinging higher than the voltage on pins 8 and 11. Are you sure that's what you have?

Do you have audio reaching the driver board?

Do you have rail to rail oscillation on the output transistors?

Are there any parts missing from the board as of now?

The amp has low voltage protection so turning the voltage down would cause it to go into protect. It shouldn't go into protect until the voltage reaches ~8.3v.

[luka]

do you know if led even works?

[Ground Zero]

Hello

i take this post because i also have a problem with this amp

I hava a pop noise when i power up the radio, i verify the ground and it's ok so i don't know what to do

I have 0.708 VDC on the teminal speakers when the pop noise appear with the subwoofer is connected on the amplifier Sinus live and i have 0.433VDC at output when the speaker in not connected

is it normal ?

Thanks for your help

[Perry Babin]

Assuming that you had the meter connected directly across the speaker terminals, that's not normal. Post the DC voltage on all 14 pins of U2. Place the black meter probe on the negative speaker terminal. Place the red meter probe on the points where you need to measure the voltage.

[Ground Zero]

Hello Perry

Thanks for your help

I'll do what you say but do you think i can continu to use the amp whitout a risk to destroy my subwoofer or i must stop to use it ?

i change the ground and the problem is the same....

Thanks

[Perry Babin]

0.7v isn't going to damage a woofer that can take the full output power from that amp.