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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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12th Jun 2019, 1:26 pm | #1 |
Heptode
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 719
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Need component identification please
I have just stuffed my bike radio and looking on the control board for clues. What would you say this component was? I know what I think it is, but before I do anything else, I wanted a second opinion. Meter reads open circuit, no initial response on connecting the test leads. Voltage either side differs.
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12th Jun 2019, 1:28 pm | #2 |
Heptode
Join Date: May 2008
Location: Selby, North Yorkshire, UK.
Posts: 949
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Re: Need component identification please
Crystal or ceramic resonator
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12th Jun 2019, 1:29 pm | #3 |
Heptode
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 719
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Re: Need component identification please
Not what I thought it was then! Thanks.
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12th Jun 2019, 1:37 pm | #4 |
Heptode
Join Date: May 2008
Location: Selby, North Yorkshire, UK.
Posts: 949
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Re: Need component identification please
Bet you thought it was a fuse?
I've seen crystals and fuses in exactly the same size and shape packages at this size! The give away is that it's right up by a big IC, presumably a custom microcontroller. You'll most likely find that it connects to two of that chip's pins.
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12th Jun 2019, 2:54 pm | #5 |
Heptode
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 719
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Re: Need component identification please
I hoped it might be a fuse, but SMD fuses seem to be always square section rather than tubular.
I am stuck now, I don't know if it is the radio or the control head at fault. Secondhand they are £200 each so not sure what to do about it. The equipment is made by Becker and it is a Professional 2000 CD/Radio with separate controls. Very similar to BMW cars E36 onwards. |
12th Jun 2019, 2:58 pm | #6 |
Heptode
Join Date: May 2008
Location: Selby, North Yorkshire, UK.
Posts: 949
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Re: Need component identification please
I think square section fuses are more common than the round ones, and likewise round crystals more common than the square ones! But then crystals and resonators come in all manner of rectangles, cylinders, etc
I once had to repair a transceiver with a round crystal, a round fuse, and several MELF power resistors all on the same sub-PCB!
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12th Jun 2019, 3:02 pm | #7 |
Octode
Join Date: May 2011
Location: Lancashire, UK.
Posts: 1,349
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Re: Need component identification please
Have you stuck a scope on it to see if anything plausible is on there?
I agree with Martin that the location suggests a crystal of some kind although tbh, I've also never seen one quite like that. Too much contact surface area that could radiate HF noise. Could it be some kind of backup device (although again, never seen one like that)? |
12th Jun 2019, 5:28 pm | #8 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,801
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Re: Need component identification please
I agree. Location suggests a crystal or ceramic resonator for clocking a chipful of logic. I too have never seen one in that package. There are often two chip capacitors associated with them.
Becker make good quality stuff (and I design stuff in competition with them) David
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12th Jun 2019, 5:53 pm | #9 |
Hexode
Join Date: Jun 2018
Location: Buckinghamshire, UK.
Posts: 382
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Re: Need component identification please
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12th Jun 2019, 6:49 pm | #10 |
Octode
Join Date: May 2011
Location: Lancashire, UK.
Posts: 1,349
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Re: Need component identification please
Good detective work, I can't say I've ever come across that outline before
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12th Jun 2019, 7:10 pm | #11 | |
Heptode
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 719
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Re: Need component identification please
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12th Jun 2019, 7:11 pm | #12 | |
Heptode
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 719
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Re: Need component identification please
Quote:
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12th Jun 2019, 7:15 pm | #13 |
Hexode
Join Date: Jun 2018
Location: Buckinghamshire, UK.
Posts: 382
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Re: Need component identification please
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