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Old 20th March 2017, 04:38 PM   #241
akltam is offline akltam  Hong Kong
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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
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Old 21st March 2017, 04:51 AM   #242
bvtrinh is offline bvtrinh  United States
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Default Thank you!

Quote:
Originally Posted by akltam View Post
Here is a pic. Not very sharp
Thank you Alan! I was a bit confused about labeling the passive output boards as I/V since it is already in volts. Now everything is clear. Thank you Quanghao and Alan!

http://www.diyaudio.com/forums/attac...-es9038pro.gif
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Old 21st March 2017, 05:11 AM   #243
bvtrinh is offline bvtrinh  United States
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Default Transformer questions

Hello Quanghao,

Does the transformer need to be dual secondaries or can I use a transformer with a center tap? Thank you!

Bao
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Old 21st March 2017, 05:45 AM   #244
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Quote:
Originally Posted by bvtrinh View Post
Hello Quanghao,

Does the transformer need to be dual secondaries or can I use a transformer with a center tap? Thank you!

Bao
center tap . it is ok
thanks

Last edited by quanghao; 21st March 2017 at 05:50 AM.
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Old 21st March 2017, 05:49 AM   #245
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Quote:
Originally Posted by akltam View Post
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
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!
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Old 21st March 2017, 07:44 AM   #246
akltam is offline akltam  Hong Kong
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Quote:
Originally Posted by quanghao View Post
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!
Hi Quanghao,

The C42 is an SMD capacitor, there is no indication of the value of this capacitor. You want me to remove it ?
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Old 21st March 2017, 08:50 AM   #247
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Quote:
Originally Posted by akltam View Post
Hi Quanghao,

The C42 is an SMD capacitor, there is no indication of the value of this capacitor. You want me to remove it ?
Yes , remove it now and check 3.3 v.
Thanks
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Old 21st March 2017, 01:45 PM   #248
akltam is offline akltam  Hong Kong
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Quote:
Originally Posted by quanghao View Post
Yes , remove it now and check 3.3 v.
Thanks
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.
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Last edited by akltam; 21st March 2017 at 01:48 PM.
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Old 21st March 2017, 02:09 PM   #249
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[QUOTE=akltam;5026226]Hi Quanghao,

The problem you say, is not so. The C42 capacitor is not fault.

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 !
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Old 21st March 2017, 02:13 PM   #250
Myint67 is offline Myint67  Singapore
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[QUOTE=quanghao;5026244]
Quote:
Originally Posted by akltam View Post
Hi Quanghao,

The problem you say, is not so. The C42 capacitor is not fault.

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 !
Hi Alan ,
Thanks ,picture pls
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