Author Topic: Cannot identify a part. Please help!  (Read 1193 times)

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Offline tudorv

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Cannot identify a part. Please help!
« on: December 24, 2017, 07:40:33 pm »
Hello,

i have to change a part on an intercom pcb but i cannot correctly identify the part just after the indicative, maybe any of you can drop a hint.

here are some pictures

https://ibb.co/bDvrem
https://ibb.co/mgpv5R
https://ibb.co/ecHts6
https://ibb.co/exQDs6
https://ibb.co/cypHKm
https://ibb.co/ceOoQR
https://ibb.co/cSDBem
https://ibb.co/hGZHKm

Thank you!

« Last Edit: December 24, 2017, 07:49:57 pm by tudorv »
 

Offline ataradov

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Re: Cannot identify a part. Please help!
« Reply #1 on: December 24, 2017, 08:00:04 pm »
They look like 330K trim pots.  The adjustment slot is covered with wax to fix the setting, and possibly prevent water ingress. Try to dig though the circle and see if you can find the adjustment slot.

They also appear to be covered with conformal coating with the rest of the board.

And if they are adjustable, you will need to know the adjustment as well.

But the placement is strange for trim pots, so I may be wrong here.
« Last Edit: December 24, 2017, 08:03:07 pm by ataradov »
Alex
 

Offline DC1MC

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Re: Cannot identify a part. Please help!
« Reply #2 on: December 24, 2017, 08:11:47 pm »
 
The following users thanked this post: tudorv

Offline ataradov

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Re: Cannot identify a part. Please help!
« Reply #3 on: December 24, 2017, 08:12:44 pm »
Feriite beads (filter coils)
Yes, this makes more sense given the placement.
Alex
 

Offline tudorv

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Re: Cannot identify a part. Please help!
« Reply #4 on: December 25, 2017, 10:30:02 am »
Yes, this must be

But can you tell what value is this one?
https://ibb.co/exQDs6

I desolder the other one which is working and measuring it it shows 3.2ohms

Thank you
 

Offline tudorv

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Offline DC1MC

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Re: Cannot identify a part. Please help!
« Reply #6 on: December 25, 2017, 11:18:02 am »
I would be very amazed if it will make a difference; so I would say, go for it, it will be anyways way better than 330K trim pot  >:D

Ninja edit: Go get yourself one of these cheap LCR meters if you're overly concerned about the exact value, but to me it looks that both mine and yours will work perfectly.
« Last Edit: December 25, 2017, 11:20:17 am by DC1MC »
 

Offline tudorv

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Re: Cannot identify a part. Please help!
« Reply #7 on: December 26, 2017, 08:55:50 pm »
yes, i will order one of them and i will see

thank you!
 


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