Author Topic: Help me translate SMD marking code => component value/id  (Read 1411 times)

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Offline GaktytTopic starter

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Help me translate SMD marking code => component value/id
« on: January 08, 2020, 03:01:25 pm »
Hi folks,

In order to attempt repairing the front-end of my scope https://www.eevblog.com/forum/repair/siglent-oscilloscope-sds2104x-repair-help/ I need to know the component value (part id/number) so that I can order it.

K52G - SOT-23 I believe it's a transistor of some sort NPN/FET
AUE 6683 - SOIC-8 I believe it's a op-amp
T4 -  I believe it's a diode

Can you please assist?

I have attached a picture of the front-end
 

Offline Yansi

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Re: Help me translate SMD marking code => component value/id
« Reply #1 on: January 08, 2020, 03:15:23 pm »
you would do better just supplying a detailed photo, than the rewritten marking, as the the "K52G" is likely just "K52" (BAV199 diode) ang G is some other indentifier.

The board look awful lot like an oscilloscope input buffer, so a BAV199 seems legit in that obligatory circuit, also in the place near "3EM" (MMBTH10).

Not sure what 6683 may be from a brief search. Send please just a detailed photo. Experienced eye may guess even the manufacturer of the IC, based on the package and marking font style.
 
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Online mikerj

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Re: Help me translate SMD marking code => component value/id
« Reply #2 on: January 08, 2020, 03:39:32 pm »
AUE is probably an OPA727 20MHz precision op-amp.
 
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Offline GaktytTopic starter

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Re: Help me translate SMD marking code => component value/id
« Reply #3 on: January 08, 2020, 04:08:34 pm »
Hi Yansi

you would do better just supplying a detailed photo, than the rewritten marking

I hear you, but that is the best I can do with my equipment, but Dave made a teardown of the scope in much better quality and even promised some hi-res pictures (which I can't find). look here https://www.youtube.com/watch?time_continue=1018&v=E3B4OTV8f1o&feature=emb_logo front-end is at 16:58

, as the the "K52G" is likely just "K52" (BAV199 diode) ang G is some other indentifier.

The board look awful lot like an oscilloscope input buffer, so a BAV199 seems legit in that obligatory circuit, also in the place near "3EM" (MMBTH10).

Not sure what 6683 may be from a brief search. Send please just a detailed photo. Experienced eye may guess even the manufacturer of the IC, based on the package and marking font style.

Thank you for the K52 and 3EM, I have the feeling that the real culprit is the 6683.
 

Offline GaktytTopic starter

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Re: Help me translate SMD marking code => component value/id
« Reply #4 on: January 08, 2020, 04:12:10 pm »
Hi miker

AUE is probably an OPA727 20MHz precision op-amp.

Thank you for your suggestion, based on the pin-out it is likely, but a 20MHz op-amp in a 300MHz scope front-end, does that seem probable? 
 

Offline Yansi

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Re: Help me translate SMD marking code => component value/id
« Reply #5 on: January 08, 2020, 05:10:40 pm »
Why wouldn't it?

There are a lot of jobs for precision low speed opamps in DSO input circuitry, such as the input DC servo or input offset control.

Most of the cheap scopes do in fact have a fully discrete frontends, as they are cheaper, than unobtanium high speed opamps.
 

Offline GaktytTopic starter

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Re: Help me translate SMD marking code => component value/id
« Reply #6 on: January 08, 2020, 06:11:58 pm »
Why wouldn't it?

I'm just raising the question for the reason stated earlier, I'm not claiming it's totally out of place, because as you say; there are lot of jobs for a low speed op-amp in the front end.
 


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