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DAC ES9038 PRO Group Buys

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#241
Dear Quanghao,

I was checking the voltage supply for each regulator. I found that the voltage labelled '3.3V_CL' only got 2.1V. I think this is the voltage to supply to the clock crystal.

What should be the correct voltage supply to the clock ? Is there something wrong ? I thought it should be 3.3V.

Alan
 
#245
akltam said:
Dear Quanghao,

I was checking the voltage supply for each regulator. I found that the voltage labelled '3.3V_CL' only got 2.1V. I think this is the voltage to supply to the clock crystal.

What should be the correct voltage supply to the clock ? Is there something wrong ? I thought it should be 3.3V.

Alan
Click to expand...

Here is the voltage for the Clock: 100MHZ. 3.3V

Find out carefully, check out C42. Maybe it caused the error! Or pins of LT3042 (IC5).
Touch or touch! Find it.

If you have capacitor 1206 = 10uF (C42), replace it!
thank you very much!
 
#248
quanghao said:
Yes , remove it now and check 3.3 v.
Thanks
Click to expand...

Hi Quanghao,

I removed C42 and the voltage is now 3.3V. Thank you.

Is this problem happening to all the boards you sent out already. If so, you need to inform all the other buyers to remove C42 from their boards. For those you have not sent out, you need to remove C42 for them.

Removing C42 is easy, first locate the indicator which said '3.3V_CL'. The LT3042 regulator next to this indicator is responsible for the 3.3V for the clock. C42 will be next to this regulator. To remove it, hold C42 with a plier, use a solder iron to heat one side of C42 for a few seconds, then C42 will come off easily.

Hope this helps all.
 
Last edited:
#251
quanghao said:
Cause the capacitor to fail in production.

Which is my experience.

You need to find another capacitor to replace: 1uF to 10uF / 6.3V.

thank you again !
Click to expand...

Hi Quanghao,

Remove C42 is easy. But put back another one is very difficult due to such a small size. My eye sight is not good and my hand is very shaky to put back such a small SMD capacitor.

Anyway I will see what I can do.
 
#252
Myint67 said:
Hi Alan ,
Thanks ,picture pls
Click to expand...

Hi Myint67,

If you have the ES9038 board with all the connectors (SPDIF, AES ...etc) right on your stomach, The '3.3V_CL' indicator is just above and left of the USB connectors.

The voltage there should be about 3.3V. According to Quanghao, the failure probably only happen during production and WILL NOT happen to everyone. So if you have 3.3V, there is nothing to worry about.

Hope this help. As I need to find a camera with macro lense, let me know if you still want a pic.
 
#259
Hi Quanghao,

Have your tried to implement the ES9038 board with electrolytic capacitors in the power supply instead of Aluminium Polymer capacitors ?

I have an impressions that Aluminium Polymer capacitors are not best use for audio circuitry.
 
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