Component Identification

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frisky2good

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Please I need help identifying the components circles in the attached image. I have also attached the schematics provided by the PCB manufacturer.

Thanks
 

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I think the circled parts are ceramic capacitors.
I also thing there must be a page 2 to the schematic.
 
ronsimpson said:
I also thing there must be a page 2 to the schematic.
Click to expand...
There are a total of eight pages to that diagram.

Look at the bottom right hand corner where it says:
Schaltplan bl 4 von 8

This translates to English as:
Circuit Diagram page 4 of 8

JimB
 
ronsimpson said:
I think the circled parts are ceramic capacitors.
I also thing there must be a page 2 to the schematic.
Click to expand...

I have attached all the pages that have to do with the PCB. I will also like if you can tell me the equivalent of the component in through hole components. Thanks
 

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Frisky2good,
Your schematic "screenshots" are mostly unreadable on my PC, the resolution of the JPG files is a bit low.

However, when I click on the original picture of the board, I can clearly see that the unknown components are adjacent to IC2, IC19, IC25 and IC30.

So if you can have a look at the schematics on your PC, and find those components, then post a higher resolution version of the appropriate schematic, then we may be able to decide on the nature of the unknown components.

JimB
 

Thanks for your effort so far. Here is a PDF version of the schematics.
 

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ronsimpson said:
I think the circled parts are ceramic capacitors.
Click to expand...
I agree with Ron.

The appear to be the larger ceramic (or poly) caps associated with the voltage regulators - eg. the 470nF ones such as C49, C67, C73 on page 5 of the schematic.

You could check for continuity between the capacitor ends and ground or the relevant test point to confirm that's where they are connected.
 
Here is the picture of the circled parts. Note the "IC25", IC19, IC30, IC2.

Next I used the PDF search function to find "IC25". Which is a large flash memory IC.
AND
IC2 is a AD820BR.

Are you certain the schematic = PCB?
 


It's the schematic. The components are actually connected to the LM2941 POWER REGULATORS. If you can help me trace them through that I will be very happy
 
Ron,
Be aware that there are two schematics in that PDF
The first scheamtic is drawing number L1.8072.2003.0
The second is drawing number L1.8072.2103.0

If you look on sheet 5 of dwg no L1.8072.2003.0 which is page 5 of the PDF, you will find:





JimB
 
The regulators are on page 5 of the diagrams, the capacitors are either 470nF or 100nF, depending which regulator they are on, and if they are on the input or the output.

Why do you want to know anyway?.
 
Nigel Goodwin said:
The regulators are on page 5 of the diagrams, the capacitors are either 470nF or 100nF, depending which regulator they are on, and if they are on the input or the output.

Why do you want to know anyway?.
Click to expand...

They are actually 5. I got blown beyond recognition so I asked someone that has the same equipment to send me a picture of his PCB which confirmed that the missing component is similar to those other 4. I was also fortunate to find the schematic. Since there is noone around here familiar with SMDs, I decided to seek help online. I have attached the picture of the spot where the blown component was. Top right where the arrow is.
 

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Try a 100nF, it's most likely not very critical anyway - probably just a decoupler - does the unit work without it?.
 

I can do that and upload the
Nigel Goodwin said:
Try a 100nF, it's most likely not very critical anyway - probably just a decoupler - does the unit work without it?.
Click to expand...

I did not power it after blew up but I will try it tomorrow. Thanks a lot. Can I replace it with a 100nf, 15v through hole cap because SMD components are not available here?
 
Nigel Goodwin said:
Yes, just stick a normal cap across the pads.
Click to expand...

... But try to clean the area as best you can first, to remove all the blackened stuff and any possible conductive fragments that could cause further problems..

Use a cloth with a trace of alcohol, an old toothbrush, a pencil eraser or whatever you can to try and get the PCB as as clean as possible before adding new parts.
 
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